JP5157752B2 - COMMUNICATION SYSTEM, COMMAND INFORMATION STORAGE DEVICE, AND COMPUTER PROGRAM - Google Patents

Description

  The present invention relates to a data exchange technique, and more particularly to a multicast technique in data exchange by packet communication.

  Communication networks (IP networks) based on IP (Internet Protocol) are widely used. In this IP network (more specifically, a VoIP (Voice over Internet Protocol) network in which voice is converted into IP packets and integrated with data communication), command information is reliably transmitted at the same time with high quality and high reliability. There is a need to provide an information and command system.

  In the conventional command system, a server (call control server) such as a call manager manages the IP address and telephone number of the receiving terminal. In this designation system, when a call specifying the telephone number of the command terminal is made from the command terminal, the server converts the telephone number into an IP address and causes the command terminal to receive the call. Then, after the command terminal responds, the command terminal transmits voice command information. Here, when the command information is not transmitted to the commanding terminal, the command terminal retransmits the command information.

  Further, when command information is notified all at once using broadcast using IP multicast in an IP network, it is necessary to first check whether a terminal exists in the IP multicast group. Therefore, a method has been conventionally used in which an inquiry is periodically made from a multicast-compatible router or switch to a terminal using a protocol based on IGMP (Internet Group Management Protocol), and the terminal confirms by responding to the inquiry. It was. In this method, command information may be sent from a router or a switch to a terminal even when a failure occurs in the receiving terminal.

In addition to this, some techniques related to the present invention are known. One of them is an ISDN (Integrated Digital Communication Network Service) line, and a request message transmitted from another center terminal while the network controller is communicating with the center terminal is transferred to another network connected to the same ISDN line. This is a technique in which a control device receives a proxy and transmits it later. Another one of them sends data such as command information all at once using IP multicast communication, but when data must be reliably delivered, it is delivered individually using TCP / IP communication procedures. This is a technique of performing confirmation and retransmitting data if confirmation is not possible.
JP 2002-218077 A JP 2000-216825 A

  In the command system in which the server manages the command terminal as described above, when the server is stopped due to server maintenance or the like, all services are stopped. Also, even if you want to give a command with a high degree of urgency, the command terminal will send a command with a high degree of urgency while retransmitting other command information because it has not been transmitted to some commanding terminals. I couldn't.

  Furthermore, in the simultaneous notification of command information using IP multicast broadcast, it is impossible to identify whether the command information has arrived at the command terminal, so the command information is reliably transmitted to the command terminal. There was something I couldn't do.

  The present invention has been made in view of the above-described problems, and a problem to be solved is to provide a simultaneous broadcast command system capable of improving the certainty of command information transmission to a plurality of command terminals. It is to be.

  One of the programs disclosed in this specification is a computer program that causes a command information storage device that can communicate with a command terminal and an instruction terminal to function. The command information is received from the command terminal by the command terminal. The storage means for receiving the command information transmitted to the terminal group and storing it in the storage unit, and the receiving terminal that has not returned the command signal received from the command terminal to the command terminal in the command terminal group. When the communication between the receiving unit that receives information specifying the command terminal and the commanding terminal that has not returned to the command terminal received by the receiving unit is possible and communication is possible, the commanding terminal It functions as a transmission unit that transmits the command information stored in the storage unit.

  According to a communication system comprising a command information storage device, a command terminal, and a command terminal configured by executing this program on a computer, such as when performing server maintenance in a command system by a server, etc. In addition, all services will not be stopped. In addition, for the command terminal that cannot confirm whether the information transmitted from the command terminal is received or not on the command terminal side, the command information storage device transmits the command information transmitted by the command terminal to the command terminal instead. . Therefore, it is possible to transmit the command information with higher certainty as compared with the case where the command terminal simply retransmits the command information.

  Further, one of the command information storage devices disclosed in this specification is a command information storage device that can communicate with the command terminal and the command terminal, and the command terminal transmits the command terminal to the command terminal group from the command terminal. Storage means for receiving information and storing the information in a storage unit; and information for specifying an instruction terminal that has not returned a signal for receiving instruction information to the instruction terminal from the instruction terminal group in the instruction terminal group. Attempt to communicate with the receiving unit that receives the commanding terminal that has not returned to the command terminal that the receiving unit has received, and when communication is possible, the storage unit stores the commanding terminal in the storage unit. A transmission unit that transmits the command information.

According to the command system provided with this command information storage device, the same operations and effects as those of the communication system described above can be obtained.
Further, in one of the communication systems disclosed in this specification, the command terminal transmits command information to the command information storage device and the plurality of command terminals, and the command information storage device is connected to the command terminal from the command terminal. A communication system for transmitting command information to a commanding terminal that has not received a received signal, wherein the command terminal transmits command information to a command terminal group and a command information storage device. And when the command terminal receives command information from the command terminal, the command terminal stores a command signal return signal to the command terminal. A command unit that receives command information from the command terminal and stores the command information in a storage unit, and the command terminal does not return a signal that has received the command information from a group of command terminals that have transmitted the command information. Means for identifying a terminal and the command information storage device; Means for transmitting an information specifying an instruction terminal that does not send back a specified signal, and the command information storage device does not return a specified signal from the command terminal. When information specifying the terminal is received, communication with the commanding terminal that does not return to the command terminal is attempted. When communication is possible, the command information stored in the storage unit is transmitted to the commanding terminal. And a transmission unit.

  According to this communication system, the same operations and effects as those of the communication system described above can be obtained.

As described above, according to the command system disclosed in this specification, it is possible to provide a simultaneous broadcast command system that can improve the certainty of transmission of command information to a plurality of command terminals. Play.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
First, FIG. 1 will be described. FIG. 1 shows the overall configuration of a command system that is a communication system for carrying out the present invention.

  The command system shown in FIG. 1 includes a command terminal 100, a command information storage device 200, a command terminal group, a first command terminal 300a1, 300b1, and 300c1, and a second command terminal 300a2, 300b2, and 300c2. And is configured.

  The command terminal 100 transmits command information to all of the first command terminals 300a1, 300b1, and 300c1 and the second command terminals 300a2, 300b2, and 300c2. In the present embodiment, as the command information, voice data representing the voice of the commander using the command terminal 100 and image data representing an image such as a photograph or drawing are handled.

The first command terminals 300a1, 300b1, and 300c1 and the second command terminals 300a2, 300b2, and 300c2 broadcast the command information transmitted by the command terminal 100.
The first command terminals 300a1, 300b1, and 300c1 are wired terminals that transmit and receive information via a wired transmission path, and the second command terminals 300a2, 300b2, and 300c2 transmit information via a radio transmission path. A wireless terminal that performs transmission and reception. In the present embodiment, the first command terminal 300a1 and the second command terminal 300a2, the first command terminal 300b1 and the second command terminal 300b2, and the first command terminal 300c1 and the second command terminal 300c2. A pair of command terminals is configured. In this embodiment, this command terminal pair is used by the same person (commander), and the commander issues a command issued by the commander using the command terminal 100 (command information transmitted by the command terminal 100). Is received from at least one of the pair of command terminals.

  In the following description, if the first command terminals 300a1, 300b1, and 300c1 and the second command terminals 300a2, 300b2, and 300c2 that are the command terminal groups are not particularly distinguished from each other, simply “command” It will be referred to as “terminal 300”.

  The command information storage device 200 receives and stores the command information transmitted from the command terminal 100, and transmits the stored command information to a predetermined command terminal 300 in a predetermined case. .

  In FIG. 1, the command terminal 100 and the command information storage device 200 are connected to an IP network 500 that is a communication network. The IP network 500 is connected to routers 400a and 400b that relay data between the networks. The first command terminal 300a1 is wired to the router 400a, and the first command terminals 300b1 and 300c2 are wired to the router 400b. Furthermore, a wireless LAN (Local Area Network) access point 305a is connected to the router 400a so that data can be exchanged with the second command terminal 300a2 via a wireless transmission path. The router 400b is connected to a wireless LAN access point 305b that allows data to be exchanged with the second command terminals 300b2 and 300c2 via a wireless transmission path. That is, for the router 400a, the first command terminal 300a1 and the second command terminal 300a2 are subordinate terminals, and for the router 400b, the first command terminals 300b1 and 300c1 and the second command terminals 300b2 and 300c2 are included. It is a subordinate terminal.

  With the above configuration, communication using the IP packet is performed between the command terminal 100, the command information storage device 200, and the plurality of command terminals 300 via the IP network 500. Various types of information can be transmitted.

In the following description, each of the routers 400a and 400b is simply referred to as “router 400” unless otherwise distinguished. In the present embodiment, the routing function provided by the router 400 is not essential, and it is sufficient that the switching function can be used. Therefore, for example, a switch having a multicast function can be used instead of the router 400.
In the following description, the router 400 performs a known routing operation and multicast operation unless otherwise specified, and a detailed description of the operation is omitted.

Next, FIG. 2 will be described. FIG. 2 is a diagram showing a specific configuration of each component of the command system shown in FIG.
The command terminal 100 includes a packet receiving unit 110, a packet transmitting unit 120, a protocol control unit 130, a command control unit 140, a recording unit 150, a recording unit 160, an operation unit 170, and a display unit 180. Further, the command terminal 100 stores the command terminal management data 610 in a storage unit (not shown) connected to the command control unit 140. In addition, a headset 900 and a touch panel 910 are connected to the command terminal 100.

  The command information storage device 200 includes a packet reception unit 210, a packet transmission unit 220, a protocol control unit 230, a command control unit 240, a recording unit 250, a recording unit 260, an operation unit 270, and a display unit 280. Further, the command information storage device 200 stores the command timing management data 700 and the command terminal management data 710 in a storage unit (not shown) connected to the command control unit 240.

  The receiving terminal 300 includes a packet reception unit 310, a packet transmission unit 320, a protocol control unit 330, a command control unit 340, a recorded data reproduction unit 350, a recorded data reproduction unit 360, an operation unit 370, and a display unit 380. . In addition, a headset 901 and a touch panel 911 are connected to the receiving terminal 300.

  Each of the packet reception units 110, 210, and 310 receives an IP packet sent from the IP network 500. In the first command terminal 300a1, the packet receiver 310 receives an IP packet sent from the IP network 500 via the router 400a. In each of the first command terminals 300b1 and 300c1, the packet receiving unit 310 receives an IP packet sent from the IP network 500 via the router 400b. Further, in the second command terminal 300a2, the packet receiver 310 receives an IP packet sent from the IP network 500 via the router 400a and the wireless LAN access point 305a. In each of the second command terminals 300b2 and 300c2, the packet receiver 310 receives an IP packet sent from the IP network 500 via the router 400b and the wireless LAN access point 305b.

  Each of the packet transmission units 120, 220, and 320 transmits a predetermined IP packet to the IP network 500. In the first command terminal 300a1, the packet transmission unit 320 transmits a predetermined IP packet to the IP network 500 via the router 400a. In each of the first command terminals 300b1 and 300c1, the packet transmission unit 320 receives a predetermined IP packet to the IP network 500 via the router 400b. Further, in the second command terminal 300a2, the packet transmission unit 320 transmits a predetermined IP packet to the IP network 500 via the router 400a and the wireless LAN access point 305a. In each of the second command terminals 300b2 and 300c2, the packet transmission unit 320 transmits a predetermined IP packet to the IP network 500 via the router 400b and the wireless LAN access point 305b.

  The protocol control units 130, 230, and 330 extract various types of information from the IP packets received by the packet reception units 110, 210, and 310, and transfer them to the command control units 140, 240, and 340. Further, the protocol control units 130, 230, and 330 constitute IP packets including various information transferred from the command control units 140, 240, and 340, respectively, and the packet transmission units 120, 220, and 320, respectively. Transfer to send.

The operations of the command control units 140, 240, and 340 will be described later.
The recording units 150 and 250 are command information storage units that store voice data that is command information transferred from the command control units 140 and 240, respectively.

The recording units 160 and 260 are command information storage units that store image data that is command information transferred from the command control units 140 and 240, respectively.
The recorded data reproduction unit 350 reproduces the audio data that is the command information transferred from the command control unit 340 and outputs the audio represented by the audio data.

The recorded data reproduction unit 360 reproduces the image data that is the command information transferred from the command control unit 340 and displays the image represented by the image data.
The operation units 170, 270, and 370 are operated by the users of the command terminal 100, the command information storage device 200, and the reception terminal 300, respectively. Get various instructions. The instructions acquired by the operation units 170, 270, and 370 are transferred to the command control units 140, 240, and 340, respectively.

  Display units 180, 280, and 380 are controlled by command control units 140, 240, and 340, respectively, and command control units 140, 240, and 340 are controlled by command terminal 100, command information storage device 200, and command terminal. Various information presented to 300 users is displayed.

  The headsets 900 and 901 are each provided with a microphone (not shown) that converts received sound into an electrical signal. In each of the command terminal 100 and the command terminal 300, the electrical signal output from the microphone is a voice representing the voice by a converter (not shown) provided in the command terminal 100 and the command terminal 300. It is converted into data and transferred to the command control units 140 and 240. In the command control unit 140, the voice data is handled as command information. In addition, the headsets 900 and 901 are each provided with a speaker that outputs input sound data to an electric signal and then outputs the sound as sound.

  Touch panels 910 and 911 are operated by users of command terminal 100 and command terminal 300, respectively. In each of the command terminal 100 and the command terminal 300, the command control units 140 and 240 acquire images drawn by the operation as image data. In the command control unit 140, this image data is handled as command information.

  The router 400 includes a packet reception unit 410, a packet transmission unit 420, a protocol control unit 430, and a multicast control unit 440. Further, the router 400 stores the multicast management data 800 in a storage unit (not shown) connected to the multicast control unit 440.

The packet receiving unit 410 receives IP packets sent from the IP network 500 or the command terminal 300.
The packet transmission unit 420 transmits a predetermined IP packet to the IP network 500 or the command terminal 300 according to the destination indicated in the IP packet. More specifically, the packet transmission unit 420 transmits an IP packet destined for the command terminal 100 or the command information storage device 200 to the IP network 500. Further, the packet transmission unit 420 of the router 400a transmits an IP packet destined for the first command terminal 300a1 to the first command terminal 300a1, and transmits the IP packet destined for the second command terminal 300a2 to the wireless LAN access. Send to point 305a. Further, the packet transmission unit 420 of the router 400b transmits an IP packet destined for the first command terminal 300b1 to the first command terminal 300b1, and receives the IP packet destined for the first command terminal 300c1 as the first command. It transmits to the command terminal 300c1. The packet transmission unit 420 of the router 400b transmits an IP packet destined for the second command terminal 300b2 or 300c2 to the wireless LAN access point 305b.

  The protocol control unit 430 performs routing as necessary on the IP packet received by the packet reception unit 410 and transfers the packet to the packet transmission unit 420, and extracts various types of information included in the IP packet. Transfer to the multicast control unit 440.

  When the packet reception unit 410 receives an IP multicast packet, the multicast control unit 440 causes the packet transmission unit 420 to transmit the packet to a terminal under the router 400. Here, the IP multicast packet is a packet in which a specific IP address (multicast address) is indicated in the IP packet as a destination of the IP packet.

  The command information storage device 200 can be configured using a computer with a standard hardware configuration. FIG. 3 shows a hardware configuration example of such a computer.

  The computer shown in FIG. 3 includes an MPU 51, a ROM 52, a RAM 53, a hard disk device 54, an input device 55, a display device 56, an interface device 57, and a recording medium drive device 58. These components are all connected to the bus 59, and can exchange various data with each other under the management of the MPU 51.

An MPU (Micro Processing Unit) 51 is an arithmetic processing unit that controls the operation of the entire computer.
A ROM (Read Only Memory) 52 is a read-only semiconductor memory in which a predetermined basic control program is recorded in advance. The MPU 51 reads out and executes this basic control program when the computer is started, thereby enabling operation control of each component of the computer.

  A RAM (Random Access Memory) 53 is a semiconductor memory that can be written and read at any time and used as a working storage area as needed when the MPU 51 executes various control programs.

  The hard disk device 54 is a storage device that stores various control programs executed by the MPU 51, various data tables described later, and image data of each pamphlet. The MPU 51 reads out and executes a predetermined control program stored in the hard disk device 54, thereby enabling various control processes to be described later.

  The input device 55 is, for example, a keyboard device or a mouse device. When operated by a computer user, the input device 55 acquires input of various information from the user associated with the operation content, and the acquired input information is Send to MPU 51.

The display device 56 is, for example, a liquid crystal display, and displays various texts and images according to display data sent from the MPU 51.
The interface device 57 manages transmission / reception of various data performed via a communication line to which the computer is connected.

  The recording medium driving device 58 is a device that reads various control programs and data recorded on the portable recording medium 60. The MPU 51 can read out and execute a predetermined control program recorded on the portable recording medium 60 via the recording medium driving device 58 to perform various control processes described later. Examples of the portable recording medium 60 include a CD-ROM (Compact Disc Read Only Memory) and a DVD-ROM (Digital Versatile Disc Read Only Memory).

  When the command information storage device 200 is configured by such a computer, first, a control program for causing the MPU 51 to perform processing contents of a protocol control unit 230 and a command control unit 240 described later is created. The created control program is stored in advance in the hard disk device 54 or the portable recording medium 60. Then, a predetermined instruction is given to the MPU 51 to read and execute this control program. By doing so, the computer of FIG. 3 functions as the command information storage device 200. At this time, the interface device 57 functions as the packet receiving unit 210 and the packet transmitting unit 220, the MPU 51 functions as the protocol control unit 230 and the command control unit 240, and the hard disk device 54 functions as the recording unit 250 and the recording unit 260. To do. Further, the command timing management data 700 and the command terminal management data 710 are stored in the RAM 53, and the input device 55 and the display device 56 function as the operation unit 270 and the display unit 280, respectively.

Next, FIG. 4 will be described. FIG. 4 shows the structure of an IP packet exchanged among the command terminal 100, the command information storage device 200, and the command terminal 300.
As shown in FIG. 4, the IP packet is configured to include an IP header, a UDP header, a command control system type, and command control system additional information.

  In the IP header, the header length of this IP header, the total length of this IP packet, the source IP address that identifies the source of this IP packet, the destination IP address that identifies the destination (transmission destination) of this IP packet, etc. Information according to the IP standard is included.

The UDP header includes information conforming to the UDP (User Datagram Protocol) standard, such as a source port number and a destination port number.
The command control system type includes information indicating the type of the IP packet in the command system according to the present embodiment. As this type, a total of 12 types shown in the lower part of FIG. 4 are defined.

In the command control system additional information, information added about a part of the definition of the command control system type described above is stored. Specifically, in an IP packet whose command control system type is “command information”, voice data or image data that is command information is stored in the command control system additional information. Also, in an IP packet whose command control system type is “command terminal IP address” or “recommand command”, any one of the IP addresses assigned to the command terminal 300 is included in the command control system additional information. Stored. Further, in the IP packet whose command control system type is “command urgency information”, information indicating the command urgency is stored in the command control system additional information.

Specific examples of IP packets exchanged in the command system shown in FIG. 1 are shown in FIGS. 5A and 5B. These specific examples will be individually described later.
Next, control processes performed by the protocol control units 130, 230, and 330 and the command control units 140, 240, and 340 in the command terminal 100, the command information storage device 200, and the command terminal 300 will be described.

  First, FIGS. 6A, 6B, 6C, and 6D will be described. The flowchart constituted by these drawings shows the processing contents of the first example of the control processing performed by the command system shown in FIG.

  6A to 6D, the protocol control units 130, 230, and 330 and the command control units 140, 240 in the command terminal 100, the command information storage device 200, and the command terminal 300, respectively. And 340. Moreover, in each figure of FIG. 6A-FIG. 6D, the flow of the process performed in the instruction | command terminal 100 is arrange | positioned in the left part of a figure, the flow of the process performed in the instruction information storage apparatus 200 is arrange | positioned in the center part of a figure, The flow of processing performed at the receiving terminal 300 is arranged on the right side of the figure.

  First, the control process at the time of command start will be described. This control process realizes an operation in which the command terminal 300 transmits the command to the commander when the commander operates the command terminal 100 to give a command start command. Further, in response to the “command start” instruction, when the commander operates the command terminal 300 and makes a “command response” response, the command terminal 100 also realizes an operation of transmitting the response to the commander. This control process is for the case where the receiving terminal 300 can directly receive the IP packet transmitted by the command terminal 100 (that is, without using the command information storage device 200).

  This control process is started from the process at the command terminal 100. At the start of this process, all command response confirmation flags in the command terminal management data 610 are initially set to indicate “no response” (no reply), and all command reception confirmation flags are initially set to “no reception confirmation”. Is set. These flags will be described later.

  First, in FIG. 6A, in S1101, the command control unit 140 performs a process of detecting a “command start” command instructed by the commander by a predetermined operation on the operation unit 170, and when the command is detected, S1102 Proceed with the process.

  Next, in S1102, the command control unit 140 gives a predetermined instruction to the protocol control unit 130, and performs processing for creating an IP packet in which the command control system type is edited to “command start”. An example of the IP packet created at this time is the IP packet 1 in FIG. 5A.

  In this IP packet 1, the IP address assigned to the command terminal 100 is stored in the IP header as a source IP address (hereinafter simply referred to as “source”). Further, in this IP packet 1, the multicast address assigned to the multicast group including all the receiving terminals 300 is referred to as a transmission destination IP address (hereinafter simply referred to as “transmission destination”). Stored in the IP header. Therefore, this IP packet 1 is an IP multicast packet.

Next, in step S1103, the protocol control unit 130 controls the packet transmission unit 120 to perform processing for transmitting the IP packet 1 created by the processing in the previous step, and the processing is temporarily terminated.

  The transmitted IP packet 1 eventually reaches each of the command terminal 300 via the IP network 500 and the router 400. Although not shown, IP packet 1 that is an IP multicast packet is also received by packet receiver 210 in command information storage apparatus 200.

Next, processing in each of the commanding terminals 300 to which the IP packet 1 reaches will be described.
First, in step S1301, the protocol control unit 330 controls the packet reception unit 310 to receive an IP packet. If reception of an IP packet is detected, the process proceeds to step S1302.

  In step S <b> 1302, the command control unit 340 controls the protocol control unit 330 to perform processing for extracting various types of information from the IP packet received by the packet reception unit 310. Then, the command control unit 340 performs processing to determine whether or not the command control system type in the extracted information is “command start”. If the command control system type is “command start” (when the determination result is Yes), the process proceeds to S1303. On the other hand, when the command control system type is not “command start” (when the determination result is No), the process is temporarily ended.

In step S <b> 1303, the command control unit 340 displays the fact that the “command start” instruction has been received on the display unit 380, and performs a process of notifying the commander in use of the command terminal 300.
In step S <b> 1304, the command control unit 340 performs processing to determine whether or not a response of “command response” instructed by the commander by a predetermined operation on the operation unit 370 is detected, and the command is detected. Then (when the determination result is Yes), the process proceeds to S1305.

  In step S 1305, the command control unit 340 gives a predetermined instruction to the protocol control unit 330, and the protocol control unit 330 performs processing for editing the command control system type and creating an IP packet that is “command response”. . An example of the IP packet created at this time is the IP packet 2 in FIG. 5A.

  In this IP packet 2, the IP address assigned to the receiving terminal 300 is stored in the IP header as a transmission source. Further, the IP address (in this case, the IP address assigned to the command terminal 100) stored as the transmission source in the IP header of the IP packet 1 received by the packet reception unit 310 is stored as the transmission destination in the IP header. The

  In step S <b> 1306, the protocol control unit 330 controls the packet transmission unit 320 to perform processing for transmitting the IP packet 2 created by the processing in the previous step. Thereafter, the processing ends. The IP packet 2 transmitted at this time finally reaches the command terminal 100 via the router 400 and the IP network 500.

Next, processing in the command terminal 100 that receives the IP packet 2 from each of the command terminals 300 will be described.
First, in step S1111, the protocol control unit 130 controls the packet receiving unit 110 to receive an IP packet. If reception of an IP packet is detected, the process proceeds to step S1112.

  In step S1112, the command control unit 140 controls the protocol control unit 130 to perform processing for extracting various types of information from the IP packet received by the packet receiving unit 110. Then, the command control unit 140 performs a process of determining whether or not the command control system type in the extracted information is “command response”. If the command control system type is “command response” (when the determination result is Yes), the process proceeds to S1113. On the other hand, when the command control system type is not “command response” (when the determination result is No), the process is temporarily terminated.

  In step S <b> 1113, the command control unit 140 performs an operation process on the receiving terminal management data 610. That is, the command control unit 140 first performs processing for acquiring from the protocol control unit 130 the IP address of the transmission source stored in the IP header of the IP packet 2 whose command control system type is “command response”. Subsequently, the command control unit 140 performs a process of changing the command response confirmation flag associated with the acquired IP address to the one indicating “response” in the command terminal management data 610. In other words, the command response confirmation flag is received confirmation information (in this case, IP packet 2) transmitted by the commanding terminal 300 in response to reception of information (in this case, IP packet 1) transmitted from the command terminal 100. ) Is received by the command terminal 100.

  The command terminal management data 610 is a table in which IP addresses individually assigned to all command terminals 300 belonging to the same multicast group are associated with a command response confirmation flag and a command reception confirmation flag. It is data.

  In step S <b> 1114, the command control unit 140 displays on the display unit 180 that the response of the “command response” has been received and information indicating the receiving terminal 300 that has received the response. A process of notifying the commander in use is performed, and then the process is temporarily terminated.

  When the above processing is completed, the command terminal 100 responds to “command start” by referring to the command terminal management data 610 and extracting an IP address whose command response confirmation flag remains “no response”. The receiving terminal 300 that is not to be identified can be identified.

Next, control processing related to transmission of command information will be described. This control process is executed following the control process at the time of starting the command described above. The commander operates the command terminal 100 to issue command information, and the command terminal 300 receives the command information. Realize the action to tell. Further, when the commander operates the commanding terminal 300 to make a “receipt confirmation” response indicating that the command information has been received, the command terminal 100 also realizes an operation of transmitting the response to the commander. However, in this control process, the command information storage device 200 is used for the command terminal 300 that is known from the control process at the time of command start described above that the IP packet transmitted by the command terminal 100 cannot be directly received. Thus, the operation to transmit the command information is realized.
This control process is started from the process at the command terminal 100.

  First, in FIG. 6B, in S1121, the command control unit 140 performs a process of detecting an instruction of “command information transmission” instructed by a commander by a predetermined operation on the operation unit 170, and when the command is detected. The process proceeds to S1122.

Next, in S1122, the command control unit 140 performs a process of searching for a command response confirmation flag with reference to the receiving terminal management data 610.
Next, in S1123, processing is performed to determine whether or not each of the above-mentioned pair of command terminals 300 has a corresponding command response confirmation flag that remains “no response”. Here, for the pair of the receiving terminal 300 in which both of the command response confirmation flags remain “no response” (the determination result is Yes), the processing of S1124 and S1125 is performed for this pair. On the other hand, for the pair of the receiving terminal 300 in which at least one of the command response confirmation flags is changed to one indicating “response” (the determination result is No), the processing of S1126 and S1127 is performed for this pair. Do.

  As described above, in the present embodiment, it is assumed that the commander of the same person uses the pair of commanding terminals 300. Therefore, in the determination processing of S1123, the command information is directly (that is, command information is received) to the commander who uses the command terminal 300 pair in which at least one of the command response confirmation flags is “response”. It is determined that the message can be transmitted (without using the storage device 200).

In S <b> 1124, the command control unit 140 gives a predetermined instruction to the protocol control unit 130 and performs processing for creating two types of IP packets.
One of the IP packets created by this process has an instruction control system type of “IP address of the instruction terminal” and an instruction terminal whose instruction response confirmation flag is “no response” in the instruction control system additional information. The IP addresses of 300 pairs are stored. An example of the IP packet created at this time is the IP packet 3 in FIG. 5A. In other words, the IP packet 3 is unacknowledged command terminal information that is information that identifies the command terminal 100 that the command terminal 100 could not confirm the reception of information transmitted by the command terminal 100.

  The IP packet 3 may store the IP addresses of both pairs of the command terminal 300. The IP packet 3 storing the IP addresses of each pair of the command terminals 300 may be calculated. Two may be created.

  In addition, another IP packet created by this processing is a command control system type of “command information”, and command information acquired by the headset 900 or the touch panel 910 is stored in the command control system additional information. . An example of the IP packet created at this time is the IP packet 4 in FIG. 5A. The command information is transmitted by the command terminal 100 to the command terminal group, and for the command terminal 100 that receives a reply of “command response” in the command terminal group, the command terminal 100 100 transmits directly.

  In each of the IP packet 3 and the IP packet 4, the IP address assigned to the command terminal 100 is stored in the IP header as a transmission source. In each of the IP packet 3 and the IP packet 4, the IP address assigned to the command information storage device 200 is stored in the IP header as a transmission destination.

  In step S1125, the protocol control unit 130 controls the packet transmission unit 120 to perform processing for transmitting the IP packet 3 and the IP packet 4 created by the processing in the previous step, and the processing is temporarily ended. By this processing, the IP packet 3 and the IP packet 4 transmitted by the packet transmission unit 120 eventually reach the command information storage device 200 via the IP network 500. Processing performed by the command information storage device 200 when the IP packet 3 and the IP packet 4 arrive will be described later.

  On the other hand, in S1126, the command control unit 140 gives a predetermined instruction to the protocol control unit 130 to perform processing for creating an IP packet for transmitting command information. The IP packet created by this processing has the command control system type as “IP address of the receiving terminal”, and stores the command information acquired by the headset 900 or the touch panel 910 in the command control system additional information. An example of the IP packet created at this time is the IP packet 7 in FIG. 5A.

  In this IP packet 7, the IP address assigned to the command terminal 100 is stored in the IP header as a transmission source. Further, in this IP packet 7, the IP address assigned to the command terminal 300 in which at least one of the command response confirmation flags indicates “response is received” in the command terminal management data 610 is transmitted. Stored in the IP header as the destination.

  Next, in S1127, the protocol control unit 130 controls the packet transmission unit 120 to perform the process of transmitting the IP packet 7 created by the process of the previous step, and the process is once completed. As a result of this processing, the IP packet 7 transmitted by the packet transmitter 120 reaches the receiving terminal 300 identified by the IP address stored as the transmission destination in the IP header via the IP network 500 and the router 400. Processing performed at the receiving terminal 300 when the IP packet 7 arrives will be described later.

Next, processing performed by the command information storage device 200 when the above-described IP packet 3 and IP packet 4 arrive will be described.
First, in FIG. 6B, in S1221, the protocol control unit 230 controls the packet reception unit 210 to perform processing for receiving a predetermined IP packet. The IP packet received in this process is one in which the IP address of the command terminal 100 is stored in the IP header as a transmission source, and the IP address of the command information storage device 200 is stored in the IP header as a transmission destination. is there. Here, if reception of an IP packet is detected, the process proceeds to S1222.

  In step S1222, the command control unit 240 controls the protocol control unit 230 to perform processing for extracting various types of information from the IP packet received by the packet reception unit 210 in the processing of the previous step. Then, a process of determining whether or not the packet receiving unit 210 has continuously received the IP packet 3 and the IP packet 4 described above is performed. More specifically, in this processing, paying attention to the command control system type in the extracted information, the IP packet received first by the packet receiving unit 210 is the “IP address of the commanding terminal”. It is determined whether or not the received IP packet is “command information”. Here, when the command control unit 240 determines that the packet receiving unit 210 has received such an IP packet (when the determination result is Yes), the process proceeds to S1223. On the other hand, when it is determined that the packet receiving unit 210 has not received such an IP packet (when the determination result is No), the process is temporarily terminated.

  In S1223, the command control unit 240 receives the IP address of each pair of the command terminal 300 extracted from the command control system additional information of the received IP packet 3 (the above-mentioned reception unconfirmed command terminal information). Processing to store in the management data 710 is performed.

  Next, in S1224, the command control unit 240 distinguishes the command information extracted from the command control system additional information of the received IP packet 4 into audio data and image data, and the recording unit 250 and the recording unit 260, respectively. Process to store in.

  In step S <b> 1225, the command control unit 240 gives a predetermined instruction to the protocol control unit 230 to perform processing for creating an IP packet in which the command control system type is edited to “command start”. An example of the IP packet created at this time is the IP packet 5 in FIG. 5A.

  In this IP packet 5, the IP address assigned to the command information storage device 200 is stored in the IP header as a transmission source. In the IP packet 5, the IP address of the command terminal 300 stored in the command terminal management data 710 is stored one by one in one IP header as a transmission destination. That is, in this process, as many IP packets 5 as the number of IP addresses stored in the receiving terminal management data 710 are created.

  Next, in step S1226, the protocol control unit 230 controls the packet transmission unit 220 to perform processing for transmitting the IP packet 5 created by the processing in the previous step, and the processing is temporarily terminated. The transmitted IP packet 5 reaches each of the receiving terminals 300 to which the IP address stored as the transmission destination in the IP header is assigned via the IP network 500 and the router 400. In this way, the command information storage device 200 attempts to communicate with the command terminal group that has not returned to the command terminal 100.

Next, processing in each of the receiving terminals 300 that can communicate with the command information storage device 200 and receive the IP packet 5 will be described.
First, in S1321, the protocol control unit 330 controls the packet receiving unit 310 to receive an IP packet, and when the reception of the IP packet is detected, the process proceeds to S1322.

  Next, in S1322, the command control unit 340 controls the protocol control unit 330 to perform processing for extracting various types of information from the IP packet received by the packet receiving unit 310. Then, the command control unit 340 performs processing to determine whether or not the command control system type in the extracted information is “command start”. Here, when the command control system type is “command start” (when the determination result is Yes), the process proceeds to S1323. On the other hand, when the command control system type is not “command start” (when the determination result is No), the process is temporarily ended.

Next, in step S <b> 1323, the command control unit 340 displays the fact that the “command start” instruction has been received on the display unit 380, and performs a process of notifying the commander who is using the command terminal 300.
Next, in S1324, the command control unit 340 performs a process of determining whether or not a response of “command response” instructed by the commander by a predetermined operation on the operation unit 370 is detected, and the command is detected. Then (when the determination result is Yes), the process proceeds to S1325.

  Next, in step S1325, the command control unit 340 gives a predetermined instruction to the protocol control unit 330, and performs processing for creating an IP packet in which the command control system type is edited to “command response”. An example of the IP packet created at this time is the IP packet 6 in FIG. 5A.

  In this IP packet 6, the IP address assigned to the receiving terminal 300 is stored in the IP header as a transmission source. The IP address stored in the IP header of the IP packet 5 received by the packet receiver 310 (in this case, the IP address assigned to the command information storage device 200) is set as the transmission destination in the IP header. Stored.

  Next, in step S1326, the protocol control unit 330 controls the packet transmission unit 320 to perform processing for transmitting the IP packet 6 created by the processing in the previous step, and thereafter the processing is temporarily terminated. The IP packet 6 transmitted at this time finally reaches the command information storage device 200 via the router 400 and the IP network 500.

Next, processing in the command information storage device 200 that receives the IP packet 6 from each of the receiving terminals 300 will be described.
First, in S1231 of FIG. 6C, the protocol control unit 230 controls the packet receiving unit 210 to perform processing for receiving the IP packet transmitted from the commanding terminal 300. When reception of the IP packet is detected, the process proceeds to S1232. Proceed with the process.

In step S1232, the command control unit 240 controls the protocol control unit 230 to perform processing for extracting various types of information from the IP packet received by the packet reception unit 210. Then, the command control unit 240 performs a process of determining whether or not the command control system type in the extracted information is “command response”. If the command control system type is “command response” (when the determination result is Yes), the process proceeds to S1233. On the other hand, when the command control system type is not “command response” (when the determination result is No), the process is temporarily terminated.

  In S1233, the command control unit 240 gives a predetermined instruction to the protocol control unit 230, and performs processing for creating the IP packet 8 in FIG. 5A. This IP packet 8 has a command control system type “command information”, and command information stored in the recording unit 250 or the recording unit 260 is stored in the command control system additional information. In this IP packet 8, the IP address assigned to the command information storage device 200 is stored in the IP header as a transmission source. The IP packet 8 includes an IP address stored in the IP header of the IP packet 6 received by the packet receiving unit 210 (in this case, the IP address of the commanding terminal 300 that transmitted the IP packet 6). ) Is stored in the IP header as a destination.

  In step S1234, the protocol control unit 230 controls the packet transmission unit 220 to perform processing for transmitting the IP packet 8 created by the processing in the previous step. Through this process, the IP packet 8 transmitted by the packet transmission unit 220 reaches the receiving terminal 300 identified by the IP address stored as the transmission destination in the IP header via the IP network 500 and the router 400. Processing performed at the receiving terminal 300 when the IP packet 8 arrives will be described later.

  Next, in S1235, the command control unit 240 gives a predetermined instruction to the protocol control unit 230, and edits the command control system type to “command response” and the command control system additional information to “IP address of the receiving terminal”. A process for creating an IP packet is performed. An example of the IP packet created at this time is the IP packet 18 in FIG. 5B.

  In this IP packet 18, the IP address assigned to the command information storage device 200 is stored as a transmission source in the IP header, and the IP address assigned to the command terminal 100 is stored as a transmission destination in the IP header.

  In step S1236, the protocol control unit 230 controls the packet transmission unit 220 to perform processing for transmitting the IP packet 18 created by the processing in the previous step. Thereafter, the processing is temporarily terminated. The IP packet 18 transmitted at this time finally reaches the command terminal 100 via the IP network 500.

  By the processes from S1221 to S1226 and from S1231 to S1236, a predetermined transmission control process is performed in the command information storage device 200. That is, the transmission control process of causing the packet transmission unit 220 to transmit the command information stored in the recording unit 250 or the recording unit 260 to the commanding terminal 300 specified by the reception unconfirmed commanding terminal information This is performed in the information storage device 200.

Incidentally, the processing performed by the command terminal 100 when the IP packet 18 arrives is basically the same as the processing from S1112 to S1114 of FIG. However, at this time, in step S1113, the command control unit 140 performs an operation process on the receiving terminal management data 610, but the content of the operation is different. That is, the command control unit 140 acquires the IP address of the receiving terminal 300 stored in the command control system additional information of the IP packet 18. Subsequently, the command control unit 140 performs a process of changing the command response confirmation flag associated with the acquired IP address to the one indicating “response” in the command terminal management data 610. As a result, the command terminal 100 refers to the command terminal management data 610 and extracts the IP address whose command response confirmation flag remains “no response”, so that the command terminal 100 can pass through the command information storage device 200. The receiving terminal 300 that does not respond to “command start” can be specified.

Next, processing performed in each of the receiving terminals 300 when the above-described IP packet 7 or IP packet 8 arrives will be described.
First, in step S1331, the protocol control unit 330 controls the packet reception unit 310 to receive an IP packet. If reception of the IP packet is detected, the process proceeds to step S1332.

  In step S1332, the command control unit 340 controls the protocol control unit 330 to perform processing for extracting various types of information from the IP packet received by the packet reception unit 310. Then, the command control unit 340 performs processing for determining whether or not the command control system type in the extracted information is “command information”. That is, through this process, the command control unit 340 determines whether the IP packet received by the packet receiving unit 310 is the IP packet 7 or the IP packet 8. When the command control system type is “command information” (when the determination result is Yes), the process proceeds to S1333. On the other hand, when the command control system type is not “command information” (when the determination result is No), the process is temporarily ended.

  Next, in S 1333, the command control unit 340 performs a process of outputting the command information extracted from the command control system additional information of the received IP packet 7 or IP packet 8, and thereafter the process is temporarily ended. In this process, the command information is classified into audio data and image data, and output as audio and image from the headset 901 and the display unit 380, respectively.

  Next, in the control processing related to the transmission of the command information, when the commander operates the command terminal 300 and returns a “receipt confirmation” indicating that the command information has been received, the response is sent to the command terminal 100. A process for realizing an operation that is transmitted to the commander will be described.

This control process is started from the process at the receiving terminal 300.
First, in FIG. 6C, in S1341, the command control unit 340 performs a process of detecting a “receipt confirmation” command that is instructed by the commander by a predetermined operation on the operation unit 370, and when the command is detected. The process proceeds to S1342. The commander performs the above-described operation on the operation unit 370 when receiving the command information output from the command terminal 300 by the process of S1333 described above.

  Next, in S1342, the command control unit 340 gives a predetermined instruction to the protocol control unit 330, and the protocol control unit 330 edits the command control system type to create an IP packet that is “reception confirmation”. . An example of the IP packet created at this time is the IP packet 9 in FIG. 5A.

  In this IP packet 9, the IP address assigned to the receiving terminal 300 is stored in the IP header as a transmission source. Further, the IP address assigned to the command terminal 100) is stored in the IP header as a transmission destination.

In step S 1343, the protocol control unit 330 controls the packet transmission unit 320 to perform processing for transmitting the IP packet 9 created by the processing in the previous step. Thereafter, the processing is temporarily terminated. The IP packet 9 transmitted at this time eventually reaches the command terminal 100 via the router 400 and the IP network 500.

Next, processing in the command terminal 100 that receives the IP packet 9 from each of the command terminals 300 will be described.
First, in S1131, the protocol control unit 130 performs processing for controlling the packet receiving unit 110 to receive an IP packet. When reception of an IP packet is detected, the processing proceeds to S1132.

  In step S1132, the command control unit 140 controls the protocol control unit 130 to perform processing for extracting various types of information from the IP packet received by the packet receiving unit 110. Then, the command control unit 140 performs processing for determining whether or not the command control system type in the extracted information is “reception confirmation”. That is, by this process, the command control unit 140 determines whether or not the IP packet received by the packet receiving unit 110 is the IP packet 9. Here, when the command control system type is “reception confirmation” (when the determination result is Yes), the process proceeds to S1133. On the other hand, when the command control system type is not “reception confirmation” (when the determination result is No), the process is temporarily ended.

  Next, in S <b> 1133, the command control unit 140 performs an operation process on the receiving terminal management data 610. That is, the command control unit 140 first performs processing for acquiring the IP address of the transmission source stored in the IP header of the IP packet 9 whose command control system type is “reception confirmation” from the protocol control unit 130. Subsequently, the command control unit 140 performs a process of changing the command reception confirmation flag associated with the acquired IP address to the one indicating “received” in the command terminal management data 610.

  In step S <b> 1134, the command control unit 140 displays on the display unit 180 that the “receipt confirmation” reply has been received and information indicating the receiving terminal 300 that has received the reply. A process of notifying the commander in use is performed, and then the process is temporarily terminated.

  When the above processing is completed, the command terminal 100 refers to the command terminal management data 610 and extracts an IP address whose command reception confirmation flag remains “no reception confirmation”, thereby obtaining “command information reception”. Can be identified.

  Next, the control process at the time of command completion will be described. This control process realizes an operation in which the command terminal 300 transmits the instruction to the commander when the commander operates the command terminal 100 after completing the transmission of the command information to give a command termination command. . This control process corresponds to both the case where the receiving terminal 300 can directly receive the IP packet transmitted by the command terminal 100 and the case where it can be received using the command information storage device 200.

This control process is started from the process at the command terminal 100.
First, in FIG. 6C, in S1141, the command control unit 140 performs a process of detecting an “command end” command instructed by the commander by a predetermined operation on the operation unit 170, and when the command is detected, S1142 is performed. Proceed with the process.

Next, in S1142, the command control unit 140 performs a process of searching for a command reception confirmation flag with reference to the command terminal management data 610.
Next, in S <b> 1143, processing is performed to determine whether each of the above-mentioned pair of command terminals 300 has a corresponding command reception confirmation flag that remains “no reception confirmation”. . Here, for the pair of the receiving terminal 300 in which both of the command reception confirmation flags remain “no reception confirmation” (the determination result is Yes), the processing of S1144 and S1145 is performed for this pair. On the other hand, with respect to the pair of the receiving terminal 300 in which at least one of the command reception confirmation flags is changed to one indicating “reception” (the determination result is No), S1146 in FIG. The process of S1147 is performed.

  As described above, in the present embodiment, it is assumed that the commander of the same person uses the pair of commanding terminals 300. Therefore, in the determination processing of S1143, the command information is directly (that is, command information is received) to the commander who uses the command terminal 300 pair in which at least one of the command reception confirmation flags is “received”. It is determined that it is transmitted (without using the storage device 200).

In step S1144, the command control unit 140 gives a predetermined instruction to the protocol control unit 130 to perform processing for creating two types of IP packets.
One of the IP packets created by this processing is the IP packet 3 described above. However, in the IP packet 3 created by this process, the command control system additional information stores the IP address of each pair of the command terminal 300 whose command response reception flag is “no reception confirmation”.

  In addition, another IP packet created by this process has the command control system type “command end”. An example of the IP packet created at this time is the IP packet 13 in FIG. 5B.

  In each of the IP packet 3 and the IP packet 13, the IP address assigned to the command terminal 100 is stored in the IP header as a transmission source. In each of the IP packet 3 and the IP packet 13, the IP address assigned to the command information storage device 200 is stored in the IP header as a transmission destination.

  Next, in S1145, the protocol control unit 130 controls the packet transmission unit 120 to perform processing for transmitting the IP packet 3 and the IP packet 13 created by the processing in the previous step, and the processing is once completed. By this processing, the IP packet 3 and the IP packet 13 transmitted by the packet transmission unit 120 eventually reach the command information storage device 200 via the IP network 500. Processing performed by the command information storage device 200 when the IP packet 3 and the IP packet 13 arrive will be described later.

  On the other hand, in S1146 of FIG. 6D, the command control unit 140 gives a predetermined instruction to the protocol control unit 130 to perform processing for creating an IP packet for transmitting command information. The IP packet created by this processing has a command control system type of “command end”. An example of the IP packet created at this time is the IP packet 11 in FIG. 5B.

  In this IP packet 11, the IP address assigned to the command terminal 100 is stored in the IP header as a transmission source. Further, in this IP packet 11, the IP address assigned to the command terminal 300 in which at least one of the command reception confirmation flags indicates “received” in the command terminal management data 610 is transmitted. Stored in the IP header as the destination.

  Next, in S1147, the protocol control unit 130 controls the packet transmission unit 120 to perform processing for transmitting the IP packet 11 created by the processing in the previous step, and the processing is once completed. As a result of this processing, the IP packet 11 transmitted by the packet transmitter 120 reaches the receiving terminal 300 identified by the IP address stored as the transmission destination in the IP header via the IP network 500 and the router 400. Processing performed at the receiving terminal 300 when the IP packet 11 arrives will be described later.

Next, processing performed by the command information storage device 200 when the IP packet 3 and the IP packet 13 described above arrive will be described.
First, in FIG. 6C, in S1241, the protocol control unit 230 controls the packet reception unit 210 to perform processing for receiving a predetermined IP packet. The IP packet received in this process is one in which the IP address of the command terminal 100 is stored in the IP header as a transmission source, and the IP address of the command information storage device 200 is stored in the IP header as a transmission destination. is there. If reception of an IP packet is detected, the process proceeds to S1242.

  In step S1242, the command control unit 240 controls the protocol control unit 230 to perform processing for extracting various types of information from the IP packet received by the packet reception unit 210 by the processing in the previous step. Then, a process of determining whether or not the packet receiving unit 210 has continuously received the IP packet 3 and the IP packet 13 described above is performed. More specifically, in this processing, paying attention to the command control system type in the extracted information, the IP packet received first by the packet receiving unit 210 is the “IP address of the commanding terminal”. It is determined whether or not the received IP packet is “command end”. Here, when the command control unit 240 determines that the packet receiving unit 210 has received such an IP packet (when the determination result is Yes), the process proceeds to S1243. On the other hand, when it is determined that the packet receiving unit 210 has not received such an IP packet (when the determination result is No), the process is temporarily terminated.

  In S <b> 1243, the command control unit 240 performs a process of storing the IP address of the command terminal 300 extracted from the command control system additional information of the received IP packet 3 in the command terminal management data 710.

  In step S <b> 1244, the command control unit 240 gives a predetermined instruction to the protocol control unit 230 to perform processing for creating an IP packet in which the command control system type is edited to “command end”. An example of the IP packet created at this time is the IP packet 10 in FIG. 5B.

  In the IP packet 10, the IP address assigned to the command information storage device 200 is stored in the IP header as a transmission source. In this IP packet 10, the IP address of the receiving terminal 300 stored in the receiving terminal management data 710 is stored one by one in one IP header as a transmission destination. That is, in this process, the IP packets 10 corresponding to the number of IP addresses stored in the receiving terminal management data 710 are created.

  Next, in S1245, the protocol control unit 230 controls the packet transmission unit 220 to perform the process of transmitting the IP packet 10 created by the process of the previous step, and the process is once completed. The transmitted IP packet 10 reaches each of the receiving terminals 300 to which the IP address stored as the transmission destination in the IP header is assigned via the IP network 500 and the router 400.

Next, processing in each of the receiving terminal 300 that receives the IP packet 10 or the IP packet 11 described above will be described.
First, in S1351 of FIG. 6D, the protocol control unit 330 controls the packet receiving unit 310 to receive an IP packet, and when the reception of the IP packet is detected, the process proceeds to S1352.

  In step S <b> 1352, the command control unit 340 controls the protocol control unit 330 to perform processing for extracting various types of information from the IP packet received by the packet reception unit 310. Then, the command control unit 340 performs processing for determining whether or not the command control system type in the extracted information is “command end”. That is, by this process, the command control unit 340 determines whether the IP packet received by the packet receiving unit 310 is the IP packet 10 or the IP packet 11. If the command control system type is “command end” (when the determination result is Yes), the process proceeds to S1353. On the other hand, when the command control system type is not “command end” (when the determination result is No), the process is temporarily ended.

  Next, in S1353, the command control unit 340 displays the fact that the “command end” instruction has been received on the display unit 380, and performs a process of notifying the commanding terminal in use of the commanding terminal 300, and thereafter Is once completed.

  By performing the above processing, when the commander operates the command terminal 100 after completing the transmission of command information and gives an instruction of “end command”, the command is transmitted from the command terminal 300 to the commander. It is done.

Several control processes performed by the command system shown in FIG. 1 will be described in addition to those shown in FIGS. 6A to 6D.
First, FIG. 7 will be described. FIG. 7 is a flowchart showing the contents of a second example of the control process performed by the command system shown in FIG.

  The processing shown in FIG. 6A is performed in the command terminal 100 when the command system shown in FIG. 1 is used for the first time, that is, when the command terminal management data 610 is initialized. On the other hand, in the processing shown in FIG. 7, the command information is already transmitted in the command system, and the result of the response confirmation to the transmission of the command start instruction performed at that time is already in the command terminal management data 610. If it is reflected, it is performed at the command terminal 100. 7 is performed in place of the processes from S1121 to S1127 in FIG. 6B. When this process is performed, the process illustrated in FIG. 6A is not performed.

  In FIG. 7, first, in step S <b> 2101, the command control unit 140 performs a process of detecting a “command start” command instructed by the commander by a predetermined operation on the operation unit 170. Proceed with the process.

Next, in S2102, the command control unit 140 performs a process of searching for a command response confirmation flag with reference to the receiving terminal management data 610.
Next, in S <b> 2103, processing is performed to determine whether or not each of the pair of the receiving terminals 300 described above has a corresponding command response confirmation flag that remains “no response”. Here, for the pair of the receiving terminal 300 in which both the command response confirmation flags remain “no response” (the determination result is Yes), the processing of S2104 and S2105 is performed for this pair. On the other hand, for a pair of the receiving terminal 300 in which at least one of the command response confirmation flags is changed to a flag indicating “response received” (determination result is No), the processing of S2106 and S2107 is performed for this pair. Do.

  Since the subsequent processing from S2104 to S2107 is the same as the processing from S1124 to S1127 shown in FIG. 6B, description of these processing will be omitted. Accordingly, the IP packet 3 is created and transmitted by the processing of S2104 and S2105. That is, in command terminal 100, prior to transmission of new command information, transmission of unacknowledged command terminal information that has already been obtained for transmission of command start instruction information performed by command terminal 100 in the past is performed.

  On the other hand, in the command system shown in FIG. 1, the control processes shown in FIGS. 6B to 6D excluding the processes from S1121 to S1127 in FIG. 6B are performed as described above. Therefore, in the command information storage device 200, processing is performed in which the packet receiving unit 210 receives the IP packet 3 (reception unconfirmed command terminal information). Further, when this is received, a control process for causing the packet transmitting unit 220 to transmit the command information stored in the recording unit 250 or the recording unit 260 to the receiving terminal 300 specified by the IP packet 3 is performed by the protocol. This is performed by the control unit 230 and the command control unit 240.

  With the above processing, the following operations are realized by the communication system of FIG. That is, the command terminal 300 that has not returned to the command terminal 100 a signal indicating that the command terminal 100 has transmitted information transmitted to the command terminal group in the past than the command information is transmitted is selected from the command terminal group. When the receiving terminal specifying information to be specified is received from the command terminal 100 by the packet receiving unit 200, the packet transmitting unit 200 communicates with the receiving terminal 300 specified by the receiving terminal specifying information. When the communication is possible, the command information stored in the recording unit 250 or the recording unit 260 is transmitted to the receiving terminal 300.

  Next, FIGS. 8A and 8B will be described. FIGS. 8A and 8B are flowcharts showing the contents of a third example of the control process performed by the command system shown in FIG.

  This control process is for realizing the following operations. That is, the instructor who operates the command terminal 100 adds the degree of urgency to the command information that is the target of command transmission according to the content. When the command information storage device 200 receives command information to which an urgency level is added, the command information storage device 200 determines the urgency level. Here, when the urgency level is higher than a predetermined threshold, the command information to which the urgency level is added is given priority instead of the transmission of the command information stored in the recording unit 250 or the recording unit 260. To the receiving terminal 300.

This process is performed at least after the process of FIG. 6A described above is completed.
First, in FIG. 8A, in S3101, the command control unit 140 performs a process of detecting an instruction of “command information transmission” instructed by a commander by a predetermined operation on the operation unit 170, and when the command is detected. The process proceeds to S3102.

  Next, in S3102, the command control unit 140 performs a process of detecting an instruction of the degree of urgency of the command information that is instructed by the commander by a predetermined operation on the operation unit 170. Proceed with the process.

In step S <b> 3103, the command control unit 140 performs processing for searching for a command response confirmation flag with reference to the command terminal management data 610.
Next, in S3104, a process is performed to determine whether or not each of the above-mentioned pair of command terminals 300 has a corresponding command response confirmation flag that remains “no response”. Here, with respect to the pair of the receiving terminal 300 in which both of the command response confirmation flags remain “no response” (the determination result is Yes), the processing of S3105 and S3106 is performed for this pair. On the other hand, at least one of the command response confirmation flags has been changed to one indicating “response is present” (the determination result is No), and the process ends without doing anything. Note that the above-described IP packet 7 may be transmitted by performing the processing of S1126 and S1127 shown in FIG.

In step S3105, the command control unit 140 gives a predetermined instruction to the protocol control unit 130 to perform processing for creating three types of IP packets.
Two of the IP packets created by this processing are the IP packet 3 and the IP packet 4 described above. The remaining one of the IP packets created in this process has the command control system type “command urgency”, and the command control system additional information stores the command information urgency stored in the IP packet 4. Is. An example of the IP packet created at this time is the IP packet 12 in FIG. 5B.

  In this IP packet 12, the same transmission source and transmission destination as those in the IP packet 3 and the IP packet 4 are stored in the IP header. That is, the IP address assigned to the command terminal 100 is stored as a transmission source in the IP header, and the IP address assigned to the command information storage device 200 is stored as a transmission destination in the IP header.

  In step S3106, the protocol control unit 130 controls the packet transmission unit 120 to perform processing for transmitting the IP packet 3, the IP packet 4, and the IP packet 12 created by the processing in the previous step. To do. Through this process, the IP packet 3, the IP packet 4, and the IP packet 12 transmitted by the packet transmission unit 120 reach the command information storage device 200 via the IP network 500 before long. A process performed by the command information storage device 200 when the IP packet 3, the IP packet 4, and the IP packet 12 arrive will be described later.

  In addition, when the instruction of “command information transmission” is completed, the commander issues an instruction of “command end” instead of the instruction of “command information transmission”. In this case, the processing from S3111 to S3113 in FIG. 8A is performed.

  That is, first, in S3111, the command control unit 140 performs a process of detecting an “command end” instruction instructed by the commander by a predetermined operation on the operation unit 170, and when the instruction is detected, the process is performed in S3112. To proceed.

  Next, in S3112, the command control unit 140 gives a predetermined instruction to the protocol control unit 130 to perform processing for creating an IP packet for transmitting command information. The IP packet created by this processing has a command control system type of “command end”. An example of the IP packet created at this time is the IP packet 13 in FIG. 5B.

  In this IP packet 13, the IP address assigned to the command terminal 100 is stored in the IP header as a transmission source, and the IP address assigned to the command information storage device 200 is IP as the transmission source. Stored in the header.

  Next, in S3113, the protocol control unit 130 controls the packet transmission unit 120 to perform the process of transmitting the IP packet 13 created by the process of the previous step, and the process is temporarily terminated. With this processing, the IP packet 13 transmitted by the packet transmission unit 120 reaches the command information storage device 200 via the IP network 500. Processing performed by the command information storage device 200 when the IP packet 13 arrives will be described later.

Next, a process performed by the command information storage device 200 when the IP packet 3, the IP packet 4, and the IP packet 12 arrive will be described.
First, in FIG. 8A, in S3201, the protocol control unit 230 controls the packet reception unit 210 to perform processing for receiving a predetermined IP packet. The IP packet received in this process is one in which the IP address of the command terminal 100 is stored in the IP header as a transmission source, and the IP address of the command information storage device 200 is stored in the IP header as a transmission destination. is there. Here, if reception of an IP packet is detected, the process proceeds to S3202.

  In step S3202, the command control unit 240 controls the protocol control unit 230 to perform processing for extracting various types of information from the IP packet received by the packet reception unit 210 in the previous step. Then, a process of determining whether or not the packet receiving unit 210 has continuously received the IP packet 3, the IP packet 4, and the IP packet 12 described above is performed. More specifically, in this process, attention is paid to the command control system type in the extracted information. The IP packet received first by the packet receiving unit 210 is “the IP address of the commanding terminal”, the IP packet received subsequently is “command information”, and the IP packet received subsequently is “command command”. It is determined whether or not it is “Urgent”. Here, when the command control unit 240 determines that the packet receiving unit 210 has received such an IP packet (when the determination result is Yes), the process proceeds to S3203. On the other hand, when it is determined that the packet receiving unit 210 has not received such an IP packet (when the determination result is No), the process is temporarily terminated.

  In S3203, the command control unit 240 performs a process of storing the IP address of each pair of the command terminal 300 extracted from the command control system additional information of the received IP packet 3 in the command terminal management data 710.

  Next, in S3204, the command control unit 240 distinguishes the command information extracted from the command control system additional information of the received IP packet 4 into audio data and image data, and the recording unit 250 and the recording unit 260, respectively. Process to store in.

  Next, in S3205, the command control unit 240 performs a process of determining whether or not the urgency level extracted from the command control system additional information of the received IP packet 12 is higher than a predetermined reference value. In this urgency determination process, instead of comparing the level of urgency indicated in the received IP packet 12 with a predetermined reference value, the urgency is added to the command information received in the last past. You may make it compare with the urgency level currently made.

  In the determination process of S3205, when the command control unit 240 determines that the urgency level is not higher than the reference value (when the determination result is No), the command control unit 240 advances the process to S3206. In step S3206, the protocol control unit 230 controls the packet reception unit 210 to perform reception of a predetermined IP packet. If reception of the IP packet is detected, the process proceeds to step S3207. In step S3207, the command control unit 240 controls the protocol control unit 230 to perform processing for extracting various types of information from the IP packet received by the packet reception unit 210 in the processing of the previous step. Then, a process for determining whether or not the packet receiving unit 210 has received the IP packet 13 described above is performed. Here, when the command control unit 240 determines that the packet reception unit 210 has received the IP packet 13 (when the determination result is Yes), the process proceeds to S3208. On the other hand, when the command control unit 240 determines that the packet receiving unit 210 has not received the IP packet 13 (when the determination result is No), the processing of S3206 and S3207 is performed until the IP packet 13 is received. repeat.

  On the other hand, in the determination process of S3205, when the command control unit 240 determines that the degree of urgency is higher than the reference value (when the determination result is Yes), the command reception unit 210 of the IP packet 13 The process proceeds to S3208 without waiting for reception.

In step S <b> 3208, the command control unit 240 gives a predetermined instruction to the protocol control unit 230 to perform processing for creating an IP packet in which the command control system type is edited to “command start”. An example of the IP packet created at this time is the IP packet 5 in FIG. 5A described above.

  In step S <b> 3209, the protocol control unit 230 controls the packet transmission unit 220 to perform processing for transmitting the IP packet 5 created by the processing in the previous step, and the processing is temporarily terminated. The transmitted IP packet 5 reaches each of the receiving terminals 300 to which the IP address stored as the transmission destination in the IP header is assigned via the IP network 500 and the router 400.

  The above processing indicates the end of transmission of a series of command information transmitted from the command terminal 100 at the end of the series of command information when it is determined that the urgency level of the command information is greater than or equal to a predetermined threshold. Before the packet receiving unit 210 receives the command end information, an operation is performed in which the packet transmitting unit 220 preferentially transmits the command information determined to have an urgency level equal to or greater than the predetermined threshold.

Next, processing in each of the receiving terminals 300 that have received the IP packet 5 will be described.
First, in step S3301 of FIG. 8B, the protocol control unit 330 controls the packet reception unit 310 to receive an IP packet. If reception of the IP packet is detected, the process proceeds to step S3302.

  In step S3302, the command control unit 340 controls the protocol control unit 330 to perform processing for extracting various types of information from the IP packet received by the packet reception unit 310. Then, the command control unit 340 performs processing to determine whether or not the command control system type in the extracted information is “command start”. If the command control system type is “command start” (when the determination result is Yes), the process proceeds to S3303. On the other hand, when the command control system type is not “command start” (when the determination result is No), the process is temporarily ended.

  In step S3303, the command control unit 340 gives a predetermined instruction to the protocol control unit 330, and performs processing for creating an IP packet in which the command control system type is edited to “command response”. An example of the IP packet created at this time is the IP packet 6 in FIG. 5A described above.

  In step S 3304, the protocol control unit 330 controls the packet transmission unit 320 to perform processing for transmitting the IP packet 6 created by the processing in the previous step. Thereafter, the processing ends. The IP packet 6 transmitted at this time finally reaches the command information storage device 200 via the router 400 and the IP network 500.

Next, processing in the command information storage device 200 that receives the IP packet 6 from each of the receiving terminals 300 will be described.
First, in step S3211 of FIG. 8B, the protocol control unit 230 controls the packet reception unit 210 to perform processing for receiving the IP packet transmitted from the command terminal 300. If reception of the IP packet is detected, the process proceeds to step S3212. Proceed with the process.

  In step S <b> 3212, the command control unit 240 controls the protocol control unit 230 to perform processing for extracting various types of information from the IP packet received by the packet reception unit 210. Then, the command control unit 240 performs a process of determining whether or not the command control system type in the extracted information is “command response”. If the command control system type is “command response” (when the determination result is Yes), the process proceeds to S3213. On the other hand, when the command control system type is not “command response” (when the determination result is No), the process is temporarily terminated.

  In step S <b> 3213, the command control unit 240 performs a process of extracting information with priority added from the command information stored in the recording unit 250 or the recording unit 260. That is, the command control unit 240 performs processing for extracting the command information extracted from the IP packet 4 in the above-described S3204 from the recording unit 250 or the recording unit 260.

  Next, in S3214, the command control unit 240 gives a predetermined instruction to the protocol control unit 230 to perform processing for creating the IP packet 8 in FIG. 5A. However, the IP packet 8 has the command control system type as “command information”, and the command information extracted by the processing of the previous step is stored in the command control system additional information. In this IP packet 8, the IP address assigned to the command information storage device 200 is stored in the IP header as a transmission source. The IP packet 8 includes an IP address stored in the IP header of the IP packet 6 received by the packet receiving unit 210 (in this case, the IP address of the commanding terminal 300 that transmitted the IP packet 6). ) Is stored in the IP header as a destination.

  In step S3215, the protocol control unit 230 controls the packet transmission unit 220 to perform processing for transmitting the IP packet 8 created by the processing in the previous step. Through this process, the IP packet 8 transmitted by the packet transmission unit 220 reaches the receiving terminal 300 identified by the IP address stored as the transmission destination in the IP header via the IP network 500 and the router 400. The processing performed at the receiving terminal 300 when the IP packet 8 arrives is the processing from S1331 to S1333 shown in FIG.

  In step S <b> 3216, the command control unit 240 gives a predetermined instruction to the protocol control unit 230 to perform processing for creating an IP packet in which the command control system type is edited to “command response”. An example of the IP packet created at this time is the IP packet 18 in FIG. 5B described above.

  Next, in step S3217, the protocol control unit 230 controls the packet transmission unit 220 to perform processing for transmitting the IP packet 18 created by the processing in the previous step, and thereafter the processing is temporarily terminated. The IP packet 18 transmitted at this time finally reaches the command terminal 100 via the IP network 500. The processing performed at the command terminal 100 when the IP packet 18 arrives is the processing from S1111 to S1114 shown in FIG.

  When the above control process is performed by the command system of FIG. 1, the command information storage device 200 determines the urgency when the command information to which the urgency is added is received. If the urgency level is higher than a predetermined threshold, the command information to which the urgency level is added is given priority instead of sending the command information stored in the recording unit 250 or the recording unit 260. It transmits to the receiving terminal 300. Such an operation is realized in the command information storage device 200.

Next, FIG. 9 will be described. FIG. 9 is a flowchart showing the contents of a fourth example of the control process performed by the command system shown in FIG.
This control process is for realizing the following operations. That is, when the commander who operates the command terminal 300 cannot properly receive the command information sent from the commander, the command terminal 300 is operated to retransmit the command information. Request. When receiving the request for retransmission, the command terminal 100 gives the command information storage device 200 a predetermined instruction for substituting the transmission of command information related to the request. Upon receiving this instruction, the command information storage device 200 transmits the command information related to the request to the command terminal 300 that is the transmission source of the request. As a result, the commander can receive command information related to the request.

In addition, this process is started instead of the process in the receiving terminal 300 started from S1341 in FIG. 6C among the processes shown in the respective diagrams of FIGS. 6A to 6D described above.
First, in FIG. 9, in S4301, the command control unit 340 performs a process of detecting a “re-command request” command instructed by the commander through a predetermined operation on the operation unit 370, and the command is detected. And the process proceeds to S4302. The commander performs the above-described operation when the command information output from the command terminal 300 by the process of S1333 (FIG. 6C) described above is not received due to carelessness such as oversight. To do.

  Next, in S4302, the command control unit 340 gives a predetermined instruction to the protocol control unit 330, and the protocol control unit 330 edits the command control system type to create an IP packet as “re-command request”. Do. An example of the IP packet created at this time is the IP packet 14 in FIG. 5B.

  In this IP packet 14, the IP address assigned to the receiving terminal 300 is stored in the IP header as a transmission source. Further, the IP address assigned to the command terminal 100 is stored in the IP header as a transmission destination.

  In step S4303, the protocol control unit 330 controls the packet transmission unit 320 to perform processing for transmitting the IP packet 14 created by the processing in the previous step. Thereafter, the processing ends. The IP packet 14 transmitted at this time eventually reaches the command terminal 100 via the router 400 and the IP network 500.

Next, processing in the command terminal 100 that receives the IP packet 14 from each of the command terminals 300 will be described.
First, in step S4101, the protocol control unit 130 controls the packet receiving unit 110 to receive an IP packet. If reception of the IP packet is detected, the process proceeds to step S4102.

  Next, in S4102, the command control unit 140 controls the protocol control unit 130 to perform processing for extracting various types of information from the IP packet received by the packet receiving unit 110. Then, the command control unit 140 performs processing for determining whether or not the command control system type in the extracted information is “re-command request”. That is, by this processing, the command control unit 140 determines whether or not the IP packet received by the packet receiving unit 110 is the IP packet 14. Here, when the command control system type is “re-command request” (when the determination result is Yes), the process proceeds to S4103. On the other hand, when the command control system type is not “re-command request” (when the determination result is No), the process is temporarily ended.

In S4103, the command control unit 140 gives a predetermined instruction to the protocol control unit 130 to perform processing for creating two types of IP packets.
One of the IP packets created by this processing is the IP packet 3 shown in FIG. 5A described above. However, in the IP packet 3 created by this processing, the command control system additional information stores the IP address of the receiving terminal 300 stored as the transmission source in the IP header of the received IP packet 14.

  In addition, another IP packet created by this process has a command control system type of “command information transmission instruction”. An example of the IP packet created at this time is the IP packet 19 in FIG. 5B.

  In each of the IP packet 3 and the IP packet 19, the IP address assigned to the command terminal 100 is stored in the IP header as a transmission source. In each of the IP packet 3 and the IP packet 19, the IP address assigned to the command information storage device 200 is stored in the IP header as a transmission destination.

  In step S4104, the protocol control unit 130 controls the packet transmission unit 120 to perform processing for transmitting the IP packet 3 and the IP packet 19 created by the processing in the previous step, and the processing is temporarily ended. By this processing, the IP packet 3 and the IP packet 19 transmitted by the packet transmission unit 120 eventually reach the command information storage device 200 via the IP network 500.

Next, processing performed by the command information storage device 200 when the IP packet 3 and the IP packet 19 arrive will be described.
First, in S4201, the protocol control unit 230 controls the packet receiving unit 210 to perform processing for receiving a predetermined IP packet. The IP packet received in this process is one in which the IP address of the command terminal 100 is stored in the IP header as a transmission source, and the IP address of the command information storage device 200 is stored in the IP header as a transmission destination. is there. Here, if reception of an IP packet is detected, the process proceeds to S4202.

  Next, in step S4202, the command control unit 240 controls the protocol control unit 230 to perform processing for extracting various types of information from the IP packet received by the packet reception unit 210 by the processing in the previous step. Then, a process of determining whether or not the packet receiving unit 210 has continuously received the IP packet 3 and the IP packet 19 described above is performed. More specifically, in this processing, paying attention to the command control system type in the extracted information, the IP packet received first by the packet receiving unit 210 is the “IP address of the commanding terminal” and subsequently received. It is determined whether the received IP packet is a “command information transmission instruction”. Here, when the command control unit 240 determines that the packet receiving unit 210 has received such an IP packet (when the determination result is Yes), the process proceeds to S4203. On the other hand, when it is determined that the packet receiving unit 210 has not received such an IP packet (when the determination result is No), the process is temporarily terminated.

  In step S4203, the command control unit 240 performs processing of storing the IP address of the command terminal 300 extracted from the command control system additional information of the received IP packet 3 in the command terminal management data 710.

  Next, in S4204, the command control unit 240 gives a predetermined instruction to the protocol control unit 230, and performs processing for creating the IP packet 8 in FIG. 5A. This IP packet 8 has the command control system type as “command information”, and the command information stored in the recording unit 250 or the recording unit 260 is stored in the command control system additional information. S1233 (FIG. 6C ) Is the same as the one created by executing the processing of the last time.

  In step S4205, the protocol control unit 230 controls the packet transmission unit 220 to perform processing for transmitting the IP packet 8 created by the processing in the previous step. Through this process, the IP packet 8 transmitted by the packet transmission unit 220 reaches the receiving terminal 300 identified by the IP address stored as the transmission destination in the IP header via the IP network 500 and the router 400. The processing performed at the receiving terminal 300 when the IP packet 8 arrives is the processing from S1331 to S1333 shown in FIG.

  1 is performed by the command system shown in FIG. 1, when the commander operates the command terminal 300 to request retransmission of the command information, the command terminal 100 that has received this request receives the command information. An instruction to substitute transmission is given to the command information storage device 200. Then, the instruction information storage device 200 that has received this instruction transmits the instruction information related to the request to the instruction terminal 300 that is the transmission source of the request. Such an operation is realized in the command information storage device 200.

Next, FIG. 10 will be described. FIG. 10 is a flowchart showing the contents of a fifth example of the control process performed by the command system shown in FIG.
This control process is for realizing the following operations. That is, an inquiry is periodically made as to whether or not the router 400 is operating. When receiving the inquiry, the receiving terminal 300 transmits a response to the inquiry. When receiving a response from the commanding terminal 300, the router 400 operates the terminal operating flag for the responding commanding terminal 300 in the multicast management data 800. Thereafter, when the router 400 receives the IP multicast packet, it transmits the IP multicast packet only to the commanding terminal 300 whose terminal operating flag indicates that it is operating.

  This control process is performed by the router 400 and the receiving terminal 300 in the command system shown in FIG. At the start of this process, all the terminal operating flags in the multicast management data 800 are initially set to indicate “terminal not operating”.

  In the router 400, a timer (not shown) provided in the router 400 performs a time counting operation, and each time the predetermined time elapses, the processing from S5401 to S5402 in FIG. 10 is executed.

  First, in S5401, the multicast control unit 440 gives a predetermined instruction to the protocol control unit 430, and performs a process of creating an IP packet edited with the command control system type “inquiry during terminal operation”. An example of the IP packet created at this time is the IP packet 15 in FIG. 5B.

  In this IP packet 15, the IP address assigned to the router 400 is stored in the IP header as a transmission source, and the IP address assigned to each command terminal 300 under the router 400 is the transmission destination. Is stored in the IP header.

  Next, in step S5402, the protocol control unit 430 controls the packet transmission unit 420 to perform processing for transmitting the IP packet 15 created by the processing in the previous step, and the processing is temporarily terminated. The IP packet 15 transmitted at this time arrives at the receiving terminal 300 that is the transmission destination.

Next, the processing in each of the receiving terminal 300 to which the IP packet 15 reaches will be described.
First, in S5301, the protocol control unit 330 controls the packet receiving unit 310 to receive an IP packet, and when the reception of the IP packet is detected, the process proceeds to S5302.

  Next, in S5302, the command control unit 340 controls the protocol control unit 330 to perform processing for extracting various types of information from the IP packet received by the packet receiving unit 310. Then, the command control unit 340 performs a process of determining whether or not the command control system type in the extracted information is “inquiry while the terminal is operating”. If the command control system type is “inquiry during terminal operation” (when the determination result is Yes), the process advances to step S5303. On the other hand, when the command control system type is not “inquiry while the terminal is operating” (when the determination result is No), the process is temporarily ended.

  In step S5303, the command control unit 340 gives a predetermined instruction to the protocol control unit 330, and the protocol control unit 330 edits the command control system type to create an IP packet that is “response during terminal operation”. . An example of the IP packet created at this time is the IP packet 16 in FIG. 5B.

  In this IP packet 16, the IP address assigned to the receiving terminal 300 is stored in the IP header as a transmission source. In addition, the IP address stored as the transmission source in the IP header of the IP packet 16 received by the packet reception unit 310 (in this case, the IP address assigned to the router 400) is stored as the transmission destination in the IP header. .

  Next, in step S5304, the protocol control unit 330 controls the packet transmission unit 320 to perform processing for transmitting the IP packet 2 created by the processing in the previous step, and thereafter the processing is temporarily terminated. The IP packet 16 transmitted at this time reaches the router 400.

Next, processing in the router 400 that receives the IP packet 16 from each of the receiving terminals 300 will be described.
First, in step S5411, the protocol control unit 430 controls the packet reception unit 410 to receive an IP packet. If reception of the IP packet is detected, the process proceeds to step S5412.

  Next, in S5412, the multicast control unit 440 controls the protocol control unit 430 to perform processing for extracting various information from the IP packet received by the packet receiving unit 410. Then, the multicast control unit 440 performs processing for determining whether or not the command control system type in the extracted information is “response during terminal operation”. If the command control system type is “response during terminal operation” (when the determination result is Yes), the process advances to step S5413. On the other hand, when the command control system type is not “response during terminal operation” (when the determination result is No), the process is temporarily terminated.

  Next, in S5413, the multicast control unit 440 performs an operation process on the multicast management data 800, and then the process is temporarily terminated. That is, the multicast control unit 440 first obtains from the protocol control unit 430 the source IP address stored in the IP header of the IP packet 16 whose command control system type is “response during terminal operation”. I do. Subsequently, the multicast control unit 440 performs processing for changing the terminal operating flag associated with the acquired IP address to the one indicating “terminal operating” in the multicast management data 800. That is, this terminal operating flag is a terminal operating response information (in this case, an IP packet) transmitted by the commanding terminal 300 in response to reception of information transmitted from the router 400 (in this case, the IP packet 15). 16) indicates whether or not the router 400 has received.

  The multicast management data 800 is table data in which IP addresses individually assigned to all the receiving terminals 300 belonging to the same multicast group are associated with the terminal operating flag.

  When the above processing is completed, the router 400 refers to the multicast management data 800 and extracts the IP address in which the terminal operating flag is set to “terminal operating”, so that the commanding terminal that is operating 300 can be identified.

  Next, the processing from S5421 to S5423 in FIG. 10 will be described. This process is a process in the router 400 in which an IP multicast packet arrives, in which multicast addresses assigned to a multicast group including all the receiving terminals 300 are stored in the IP header as transmission destinations.

  First, in S5421, the protocol control unit 430 controls the packet receiving unit 410 to perform processing for receiving an IP multicast packet. Here, if reception of an IP multicast packet is detected, the process proceeds to S5422.

  Next, in S5422, with reference to the multicast management data 800, whether or not there is a terminal in which the corresponding terminal operating flag remains “terminal not operating” in each of the above-mentioned pairs of receiving terminals 300 is determined. Processing for determining whether or not. Here, for both pairs of the receiving terminal 300 in which both the terminal operating flags remain “terminal not operating” (the determination result is Yes), this processing is temporarily ended without doing anything. On the other hand, for the pair of the receiving terminal 300 in which at least one of the terminal operating flags is changed to one indicating “terminal operating” (the determination result is No), the processing of S5423 is performed for this pair. .

  As described above, in the present embodiment, it is assumed that the commander of the same person uses the pair of commanding terminals 300. Therefore, in the determination process of S5422, the command stored in the IP multicast packet is sent to the commander using the command terminal 300 pair in which at least one of the terminal operating flags is “terminal active”. It is determined that information can be conveyed.

  Next, in step S5423, the protocol control unit 430 controls the packet transmission unit 420, and the IP multicast packet received by the processing in step S5421 is set to the receiving terminal whose terminal operation flag is set to “terminal operation”. Processing to be transmitted to 300 is performed. After that, the process is once completed.

  The above control process is performed by the command system of FIG. 1, so that an inquiry as to whether or not the router 400 is operating is periodically performed, and the receiving terminal 300 that has received this inquiry sends a response to the inquiry. Send. When the router 400 receives a response from the commanding terminal 300, the router 400 operates a terminal operating flag for the responding commanding terminal 300 in the multicast management data 800. Thereafter, when the router 400 receives the IP multicast packet, the router 400 transmits the IP multicast packet only to the commanding terminal 300 whose terminal operating flag indicates that it is operating. Such an operation is realized.

Next, FIG. 11 will be described. FIG. 11 is a flowchart showing the contents of a sixth example of control processing performed by the command system shown in FIG.
This control process is for realizing the following operations. That is, when the router 400 receives command information that is an IP multicast packet from the command terminal 100 in a state where both of the above-described pairs of the command terminals 300 are inactive, the router 400 receives the command information Is requested to the command terminal 100. When receiving the request for retransmission, the command terminal 100 gives the command information storage device 200 a predetermined instruction for substituting the transmission of command information related to the request.

  Upon receiving this instruction, the instruction information storage device 200 transmits the instruction information related to the request to the instruction terminal 300 that is the transmission source of the request. Since the control process for this operation is the process from S4201 to S4205 of FIG. 9 described above, the description thereof is omitted here.

The control process shown in FIG. 11 is started when the IP multicast packet transmitted from the command terminal 100 reaches the router 400.
First, in S6401, the protocol control unit 430 controls the packet receiving unit 410 to perform processing for receiving an IP multicast packet. If reception of an IP multicast packet is detected here, the process advances to step S6402.

  In step S6402, the multicast control unit 440 controls the protocol control unit 430 to perform processing for extracting various types of information from the IP multicast packet received by the packet receiving unit 410. Then, the multicast control unit 440 performs processing for determining whether or not the command control system type in the extracted information is “command information” or “command end”. If the command control system type is “command information” or “command end” (when the determination result is Yes), the process advances to step S6403. On the other hand, when the command control system type is neither “command information” nor “command end” (when the determination result is No), the process is temporarily ended.

  In step S6403, the multicast management data 800 is referred to, and it is determined whether or not there is a terminal in which the corresponding terminal operating flag remains “terminal not operating” in each pair of the receiving terminal 300 described above. Processing is performed. Here, for the pair of the receiving terminal 300 in which both the terminal operating flags are “terminal non-operating” (the determination result is Yes), the processing after S6403 is performed for this pair. On the other hand, for the pair of the receiving terminal 300 in which at least one of the terminal operating flags is changed to one indicating “terminal operating” (the determination result is No), this process is temporarily ended without doing anything. To do.

  In step S6404, the multicast control unit 440 gives a predetermined instruction to the protocol control unit 430, and the protocol control unit 430 edits the command control system type to create an IP packet that is “re-command request”. An example of the IP packet created at this time is the IP packet 14 in FIG. 5B described above. However, in this IP packet 14, the IP address assigned to the receiving terminal 300 for which the terminal operating flag of the multicast management data 800 is set to “terminal not operating” is stored in the IP header as a transmission source. Further, the IP address assigned to the command terminal 100 is stored in the IP header as a transmission destination.

  Next, in step S6405, the protocol control unit 430 controls the packet transmission unit 420 to perform processing for transmitting the IP packet 14 created by the processing in the previous step, and thereafter the processing is temporarily terminated. The IP packet 14 transmitted at this time eventually reaches the command terminal 100 via the IP network 500.

Next, processing in the command terminal 100 that receives the IP packet 14 from the router 400 will be described.
First, in step S6101, the protocol control unit 130 controls the packet receiving unit 110 to receive an IP packet. If reception of an IP packet is detected, the process proceeds to step S6102.

  Next, in step S6102, the command control unit 140 controls the protocol control unit 130 to perform processing for extracting various types of information from the IP packet received by the packet receiving unit 110. Then, the command control unit 140 performs processing for determining whether or not the command control system type in the extracted information is “re-command request”. That is, by this processing, the command control unit 140 determines whether or not the IP packet received by the packet receiving unit 110 is the IP packet 14. If the command control system type is “re-command request” (when the determination result is Yes), the process proceeds to S6103. On the other hand, when the command control system type is not “re-command request” (when the determination result is No), the process is temporarily ended.

In step S6103, the command control unit 140 gives a predetermined instruction to the protocol control unit 130 to perform processing for creating two types of IP packets.
One of the IP packets created by this processing is the IP packet 3 shown in FIG. 5A described above. However, in the IP packet 3 created by this processing, the command control system additional information stores the IP address of the receiving terminal 300 stored as the transmission source in the IP header of the received IP packet 14. In addition, another IP packet created by this process has a command control system type of “command information transmission instruction”. An example of the IP packet created at this time is the IP packet 19 in FIG. 5B.

  In each of the IP packet 3 and the IP packet 19, the IP address assigned to the command terminal 100 is stored in the IP header as a transmission source. In each of the IP packet 3 and the IP packet 19, the IP address assigned to the command information storage device 200 is stored in the IP header as a transmission destination.

  In step S6104, the protocol control unit 130 controls the packet transmission unit 120 to perform processing for transmitting the IP packet 3 and the IP packet 19 created by the processing in the previous step, and the processing is temporarily terminated. By this processing, the IP packet 3 and the IP packet 19 transmitted by the packet transmission unit 120 eventually reach the command information storage device 200 via the IP network 500.

  As described above, the processing performed by the command information storage device 200 when the IP packet 3 and the IP packet 19 arrive is processing from S4201 to S4205 in FIG.

  When the router 400 receives an IP multicast packet by performing the above control processing in the command system of FIG. 1, when the router 400 has both of the receiving terminal 300 pairs inactive, The command terminal 100 is requested to retransmit the command information. When the command terminal 100 receives the request for retransmission, the command terminal 100 gives the command information storage device 200 a predetermined instruction for substituting transmission of command information related to the request. Such an operation is realized.

Next, FIG. 12 will be described. FIG. 12 is a flowchart showing the contents of a seventh example of the control process performed by the command system shown in FIG.
This control process is for realizing the following operations. That is, when the commander performs a predetermined operation indicating command rejection on the command terminal 300, the command terminal 300 transmits information to the command terminal indicating command rejection to the router 400. When the router 400 receives this information, it operates the multicast management data 800 described above to set the terminal operating flag for the receiving terminal 300 that transmitted the command rejection to the terminal inactive state. . By doing so, when the router 400 later receives an IP multicast packet, the IP multicast packet is not transmitted to the receiving terminal 300 that has transmitted the command rejection, and packet transmission waste is reduced. .

  The control process shown in FIG. 12 is first started in the commanding terminal 300 when the commander operates the commanding terminal 300 to give an instruction of “command rejection” indicating rejection of command information reception. The

First, in S7301, the command control unit 340 performs a process of detecting a “command rejection” command instructed by the commander through a predetermined operation on the operation unit 370. When the command is detected, the process is performed in S7302. Proceed.

  Next, in S7302, the command control unit 340 gives a predetermined instruction to the protocol control unit 330, and the protocol control unit 330 edits the command control system type to create an IP packet with “command reject”. . An example of the IP packet created at this time is the IP packet 17 in FIG. 5B.

  In this IP packet 17, the IP address assigned to the receiving terminal 300 is stored in the IP header as a transmission source. In addition, the IP address assigned to the router 400 is stored in the IP header as a transmission destination.

  In step S7303, the protocol control unit 330 controls the packet transmission unit 320 to perform processing for transmitting the IP packet 17 created by the processing in the previous step. Thereafter, the processing ends. The IP packet 17 transmitted at this time reaches the router 400.

Next, processing in the router 400 that receives the IP packet 17 from each of the receiving terminals 300 will be described.
First, in step S7401, the protocol control unit 430 controls the packet reception unit 410 to receive an IP packet. If reception of an IP packet is detected, the process advances to step S7402.

  In step S7402, the multicast control unit 440 controls the protocol control unit 430 to perform processing for extracting various types of information from the IP packet received by the packet receiving unit 410. Then, the multicast control unit 440 performs a process of determining whether or not the command control system type in the extracted information is “command rejection”. That is, by this processing, the multicast control unit 440 determines whether or not the IP packet received by the packet receiving unit 310 is the IP packet 17. If the command control system type is “command rejection” (when the determination result is Yes), the process advances to S7403. On the other hand, when the command control system type is not “command rejection” (when the determination result is No), the process is temporarily ended.

  Next, in S7403, the multicast control unit 440 performs an operation process on the multicast management data 800. That is, the multicast control unit 440 first performs a process of acquiring the IP address of the transmission source stored in the IP header of the IP packet 17 whose command control system type is “command rejection” from the protocol control unit 430. Subsequently, the multicast control unit 440 performs processing to change the terminal operating flag associated with the acquired IP address in the multicast management data 800 to one indicating “terminal not operating”. After execution of the above processing, the processing is once ended.

  When the above processing is completed, the router 400 does not transmit the IP multicast packet to the receiving terminal 300 that is the transmission source of the IP packet 17 after executing the processing from S5421 to S5423 in FIG. This reduces the waste of packet transmission.

Next, FIG. 13 will be described. FIG. 13 is a flowchart showing the contents of the eighth example of the control process performed by the command system shown in FIG.
This control process is for realizing the following operations. That is, in the processing from S1221 to S1226 in FIG. 6B described above, the transmission timing of the IP packet 5 transmitted by the command information storage device 200 to notify the command terminal 300 of “command start” can be changed. This transmission timing is changed because the IP packet 5 that did not reach the commanding terminal 300 before the change may reach the commanding terminal 300, and the commander also changes the transmission timing. This is because it may be convenient to receive the command information.

This control process is performed in the command information storage device 200.
This control process is a command (command start transmission timing change command) in which an operator (command system administrator) operating the command information storage device 200 performs a predetermined operation on the operation unit 270 to indicate a transmission timing change instruction. ), The process starts from step S8201.

First, in S8201, the command control unit 240 performs a process of detecting the command start transmission timing change command described above, and proceeds to S8202 when the command is detected.
Next, in S8202, the command control unit 240 performs a process of changing the setting of the command start transmission timing value. That is, the command control unit 240 first changes a command start transmission timing value after an operator who operates the command information storage device 200 performs a predetermined operation on the operation unit 270 and is input along with the command. To get. Then, the timing value stored in the command timing management data 700 is changed from the acquired value to the acquired value. When the above processing is completed, the processing is temporarily ended.

  Next, the processing from S8211 to S8219 in FIG. 13 will be described. This processing is performed by the command information storage device 200 in place of the processing from S1221 to S1226 in FIG. 6B when the IP packet 3 and the IP packet 4 reach the command information storage device 200.

  First, in S8211, the protocol control unit 230 controls the packet reception unit 210 to perform processing for receiving a predetermined IP packet. The IP packet received in this process is one in which the IP address of the command terminal 100 is stored in the IP header as a transmission source, and the IP address of the command information storage device 200 is stored in the IP header as a transmission destination. is there. If reception of an IP packet is detected, the process proceeds to S8212.

  In step S8212, the command control unit 240 controls the protocol control unit 230 to perform processing for extracting various types of information from the IP packet received by the packet reception unit 210 in the processing of the previous step. Then, a process of determining whether or not the packet receiving unit 210 has continuously received the IP packet 3 and the IP packet 4 described above is performed. More specifically, in this processing, paying attention to the command control system type in the extracted information, the IP packet received first by the packet receiving unit 210 is the “IP address of the commanding terminal”. It is determined whether or not the received IP packet is “command information”. Here, when the command control unit 240 determines that the packet receiving unit 210 has received such an IP packet (when the determination result is Yes), the process proceeds to S8213. On the other hand, when it is determined that the packet receiving unit 210 has not received such an IP packet (when the determination result is No), the process is temporarily terminated.

  In step S8213, the command control unit 240 performs processing for storing the IP address of the command terminal 300 extracted from the command control system additional information of the received IP packet 3 in the command terminal management data 710.

  Next, in S8214, the command control unit 240 distinguishes the command information extracted from the command control system additional information of the received IP packet 4 into audio data and image data, and the recording unit 250 and the recording unit 260, respectively. Process to store in.

Next, in S8215, the command control unit 240 performs a process of extracting a command start transmission timing value stored in the command timing management data 700.
Next, in step S8216, the command control unit 240 refers to a timer (not shown) provided in the command information storage device 200 and causes the packet transmission unit 220 to transmit command start information (the IP packet 5 described above) last time. The process of measuring the elapsed time since then.

  Next, in S8217, the command control unit 240 performs a determination process for comparing the size of the measurement result of the elapsed time in the previous step with the command start transmission timing value extracted in S8215. Here, when the measurement result is equal to or greater than the command start transmission timing value (when the determination result is Yes), the process proceeds to S8218. On the other hand, when the measurement result is less than the command start transmission timing value (when the determination result is No), the process is temporarily terminated without doing anything.

  In step S <b> 8218, the command control unit 240 gives a predetermined instruction to the protocol control unit 230, and performs processing for creating an IP packet in which the command control system type is edited to “command start”. An example of the IP packet created at this time is the IP packet 5 in FIG. 5B.

  Next, in step S8219, the protocol control unit 230 controls the packet transmission unit 220 to perform processing for transmitting the IP packet 5 created by the processing in the previous step, and the processing is temporarily terminated.

  The transmitted IP packet 5 reaches each of the receiving terminals 300 to which the IP address stored as the transmission destination in the IP header is assigned via the IP network 500 and the router 400. Since the processing performed at each of the receiving terminals 300 to which the IP packet 5 arrives is the processing from S1321 to S1326 in FIG. 6B described above, description thereof is omitted here.

  By performing the above control processing in the command information storage device 200, it is possible to change the transmission timing of the IP packet 5 transmitted by the command information storage device 200 in order to notify the command terminal 300 of “command start”. .

Next, an operation when each control process described above is executed by the command system shown in FIG. 1 will be described using a configuration example of the command system shown in FIG.
In the example of FIG. 14, it is assumed that the IP address assigned to each receiving terminal 300 is as illustrated. Here, both the first command terminal 300a1 and the second command terminal 300a2 can normally receive command information, but the commander using this pair receives command information only by the first command terminal 300a1. Shall. In addition, it is assumed that the first command terminal 300b1 and the second command terminal 300b2 are in trouble. Further, the commander who uses the pair of the first command terminal 300c1 and the second command terminal 300c2 receives the command information at the second command terminal 300c2, and rejects the first command terminal 300c1 as a command rejection. It shall be.

First, the case where the 1st example (FIG. 6A-FIG. 6D) of a control process is performed is demonstrated.
First, when the command terminal 100 detects a command start instruction from the commander (S1101), the command terminal 100 edits the command start IP packet (S1102), and transmits the IP packet 1 that is an IP multicast packet to the command terminal 300. (S1103).

  When a response by the commander is detected in response to the command start instruction (S1301 to S1304), the first command terminal 300a1 and the second command terminal 300c2 address the command terminal 100 to the IP packet of the command response. 2 is transmitted (S1305 to S1306).

  The command terminal 100 receives this IP packet 2 (S1111 to S1112). Then, the command terminal 100 sets the command response confirmation flag of the IP address corresponding to each of the first command terminal 300a1 and the second command terminal 300c2 in the command terminal management data 610 from “no response (0)”. It changes to “with response (1)” (S1113 to S1114).

  Thereafter, the command terminal 100 detects a command information transmission instruction from the commander (S1121). When this instruction is detected, the command terminal 100 searches the command terminal management data (S1122 to S1123), and sends an IP including command information to the first command terminal 300a1 and the second command terminal 300c2 that have a response. Packet 7 is transmitted (S1126 to S1127).

  On the other hand, both the first command terminal 300b1 and the second command terminal 300b2 do not respond (the determination result in S1123 is No). Therefore, the command terminal 100 transmits the IP packet 3 and the IP packet 4 obtained by editing the IP addresses and command information of the first command terminal 300b1 and the second command terminal 300b2 to the command information storage device 200 (S1124). ~ S1125).

  The command information storage device 200 receives the IP packet 3 and the IP packet 4 (S1221 to S1222). Then, the command information storage device 200 stores the IP addresses of the first command terminal 300b1 and the second command terminal 300b2 in the command terminal management data 710 and accumulates command information (S1223 to S1224). Further, the command information storage device 200 transmits the IP packet 5 indicating the command start to the first command terminal 300b1 and the second command terminal 300b2 (S1225 to S1226).

  Here, it is assumed that the failure of the first command terminal 300b1 has been recovered. At this time, in response to reception of the IP packet 5, the first command terminal 300b1 transmits the IP packet 6 indicating a command response to the command information storage device 200 (S1321 to S1326).

  The command information storage device 200 receives this IP packet 6 (S1231 to S1232). Then, the command information storage device 200 transmits the IP packet 8 storing the command information to the first command terminal 300b1 (S1233 to S1234), and transmits the IP packet 18 indicating the command response to the command terminal 100. The first command terminal 300b1 that has received the IP packet 8 outputs command information (S1331 to S1333).

  Separately from the flow of the above operation, it is assumed that the second command terminal 300c2 has detected receipt of command information from the commander (S1341). Then, the second command terminal 300c2 transmits the IP packet 9 indicating reception confirmation to the command terminal 100 (S1342 to S1343).

  The command terminal 100 receives this IP packet 9 (S1131 to S1132). Then, the command terminal 100 changes the command reception confirmation flag associated with the first command terminal 300b1 in the command terminal management data 610 from “no reception confirmation (0)” to “with reception confirmation (1)”. (S1133). Further, the command terminal 100 performs display indicating “command received” (S1134).

Thereafter, when the command terminal 100 detects a command end instruction from the commander (S1141), the command terminal 100 searches for a command reception confirmation flag in the command terminal management data 610 (S1142 to S1143). Then, an IP packet 3 storing the IP address of the first command terminal 300a1 that has a command response but no confirmation of reception and an IP packet 13 indicating a command information transmission instruction are created and transmitted to the command information storage device 200. (S1144 to S1145). On the other hand, the IP packet 11 indicating the end of the command is created and transmitted to the second command terminal 300c2 which has a command response and also has a reception confirmation (S1146 to S1147). The second receiving terminal 300c2 receives the IP packet 11
Is received, command end is output (S1351 to S1353).

Next, a case where the second example of the control process (FIG. 7) is executed will be described.
Since the first command terminal 300b1 and the second command terminal 300b2 are faulty, the command response confirmation flag of the command terminal management data 610 is already set to “no response (0)”. And Here, the command terminal 100 first detects a command start instruction from the commander (S2101). Then, the command terminal 100 transmits the IP packet 3 and the IP packet 4 obtained by editing the IP addresses and command information of the first command terminal 300b1 and the second command terminal 300b2, respectively, to the command information storage device 200 (S2102). ~ S2105).

Next, a case where the third example of the control process (FIGS. 8A and 8B) is executed will be described.
Since the first command terminal 300b1 and the second command terminal 300b2 are faulty, the command response confirmation flag of the command terminal management data 610 is already set to “no response (0)”. And

  First, the command terminal 100 detects that the commander performs a command with a high degree of urgency (here, urgency level 5 is set, and the greater the value, the higher the urgency level) (S3101 to S3102). Then, the command terminal 100 creates the IP packet 12 indicating the urgency value of the command information together with the IP packet 3 and the IP packet 4 described above (S3103 to S3105), and transmits it to the command information storage device 200 ( S3106).

  The command information storage device 200 receives these IP packets (S3201). Then, the command information storage device 200 stores the IP addresses of the first command terminal 300b1 and the second command terminal 300b2 in the command terminal management data 710 and accumulates command information (S3203 to S3204). Next, the command information storage device 200 detects whether or not the command urgency level is higher than a threshold value (S3205). Here, for example, it is assumed that the current urgency level 5 exceeds the reference value. In this case, the command information storage device 200 immediately creates the IP packet 5 indicating the command start and transmits it to the first command terminal 300b1 and the second command terminal 300b2 (S3208 to S3209). On the other hand, for example, if the current urgency level 5 is lower than the reference value, first, the reception of the IP packet 13 indicating the command end from the command terminal 100 is waited (S3206 to S3207). Then, after receiving this IP packet 13, the IP packet 5 indicating the start of command is created and transmitted to the first command terminal 300b1 and the second command terminal 300b2 (S3208 to S3209).

Next, a case where the fourth example of the control process (FIG. 9) is executed will be described.
For example, it is assumed that the command information is received by the first command terminal 300a1, but it is difficult to hear voice due to congestion of the IP network 500, for example. At this time, the commander performs a predetermined operation to instruct the first command terminal 300a1 to request re-command. When the first receiving terminal 300a1 detects this instruction (S4301), the first receiving terminal 300a1 creates an IP packet 14 indicating a re-command request and transmits it to the command terminal 100 (S4302 to S4303).

  The command terminal 100 receives this IP packet 14 (S4101 to S4102). Then, the IP packet 3 storing the IP address of the first command terminal 300a1 and the IP packet 19 indicating the command information transmission instruction are created and transmitted to the command information storage device 200 (S4103 to S4104).

When receiving these IP packets, the command information storage device 200 transmits the IP packet 8 storing the command information to the first command terminal 300a1 (S4201 to S4205).
Next, a case where the fifth example of the control process (FIG. 10) is executed will be described.

  In each of the routers 400a and 400b, an inquiry about the operation of the terminal is made to the subordinate command terminal 300 (S5401 to S5402). The receiving terminal responds when receiving this inquiry (S5301 to S5304).

  In each of the routers 400a and 400b, if there is a response from the receiving terminal 300, "terminal active (1)" is set in the terminal active flag of each of the multicast management data 800a and 800b (S5411 to S5413). Here, since the first command terminal 300b1 and the second command terminal 300b2 do not respond due to the occurrence of a failure, the terminal operating flag associated therewith is “terminal not operating (0)”. Set to

  Thereafter, the router 400b receives the IP multicast packet indicating the start of command (S5421). At this time, the corresponding terminal operating flag of the first command terminal 300b1 and the second command terminal 300b2 in the multicast management data 800b is “terminal not operating (0)”. Therefore, the router 400b does not transmit the IP multicast packet to the first command terminal 300b1 and the second command terminal 300b2 (S5422).

Next, a case where the sixth example of the control process (FIG. 11) is executed will be described.
As described above, the first command terminal 300b1 and the second command terminal 300b2 are in failure and are not operating. At this time, when receiving the IP multicast packet, the router 400b transmits the IP packet 14 indicating the re-command request to the command terminal 100 (S6401 to S6405).

  The command terminal 100 receives this IP packet 14 (S6101 to S6102). Then, the IP packet 3 storing the IP addresses of the first command terminal 300b1 and the second command terminal 300b2 and the IP packet 19 indicating the command information transmission instruction are created and transmitted to the command information storage device 200 (S6103). To S6104). Upon receiving these packets, command information storage apparatus 200 transmits IP packet 8 storing the command information to first command terminal 300b1 and second command terminal 300b2 (S4201 to S4205).

Next, the case where the seventh example of the control process (FIG. 12) is executed will be described.
The commander performs a predetermined operation to instruct the first command terminal 300c1 to reject the command. When the first receiving terminal 300c1 detects this instruction (S7301), the first receiving terminal 300c1 creates an IP packet 17 indicating instruction rejection and transmits it to the router 400b (S7302 to S7303).

  Upon receiving this IP packet 17, the router 400b sets “terminal not operating (0)” in the terminal operating flag for the first command terminal 300c1 in the multicast management data 800b (S7401 to S7403). As a result, even if the router 400b later receives the IP multicast packet, the router 400b does not transmit the IP multicast packet to the first receiving terminal 300c1 that transmitted the command rejection.

Next, the case where the eighth example (FIG. 13) of the control process is executed will be described.
When it is desired to send an IP packet 5 indicating a command start from the command information storage device 200 by specifying a transmission interval, the operator of the command information storage device 200 specifies a timing value with a command start transmission timing change command.

When receiving this command, the command information storage device 200 changes the command start transmission timing value of the command timing management data 700 (S8201 to S8202).
Thereafter, the command information storage device 200 receives the IP packet 3 and the IP packet 4 described above from the command terminal 100 (S8211 to S8212). Then, the command information storage device 20
0 stores the IP addresses of the first command terminal 300b1 and the second command terminal 300b2 in the command terminal management data 710 and accumulates command information (S8213 to S8214). Thereafter, the command information storage device 200 extracts a command start transmission timing value from the command timing management data 700 (S8215). Here, when the elapsed time from the previous transmission of the IP packet 5 becomes equal to or greater than the timing value, the command information storage device 200 sends a command start IP to the first command terminal 300b1 and the second command terminal 300b2. The packet is transmitted (S8216 to S8219).

  As described above in detail, in the command system shown in FIG. 1, all services do not stop as in the case of performing server maintenance in the command system by the server.

  Also, the operation status of the command terminal 300 is managed, and for the command terminal 300 in which a fault has occurred, command information is transmitted from the command information storage device 200 instead of the command terminal 100 after recovery from the fault. . Therefore, it is possible to reliably transmit the command information.

  Further, for example, when a command with a high degree of urgency is desired during the re-command, re-command information is transmitted from the command information storage device 200 instead of the command terminal 100. Therefore, it is possible to issue a command from the command terminal 100 even during the re-command.

  Further, when the voice information is deteriorated due to congestion of the IP network 500 and it is difficult to hear the command information, the command information storage device 200 transmits the re-command information instead of the command terminal 100. Therefore, it is possible to reliably transmit the command information.

In addition, the following additional remarks are disclosed regarding all the embodiments described above.
(Appendix 1)
A command terminal, a plurality of command terminals, and a command information storage device that can communicate with each other via a communication network are provided, and the command information transmitted by the command terminal is shared by the command terminals. A program for causing a computer to function as a command information storage device in a command system for receiving information,
The computer
A receiver for receiving information sent from the communication network;
A transmitter for transmitting predetermined information to the communication network;
A storage unit for storing predetermined information;
With
The program
Command information storage control processing for storing the command information (packet 4) received by the receiving unit in the storage unit;
The unacknowledged command terminal information that is the information transmitted from the command terminal that identifies information that cannot be confirmed by the command terminal from among the plurality of command terminals. When the reception unit receives (Packet 3), the transmission unit is controlled, and the command information stored in the storage unit is addressed to the commanding terminal specified by the reception unacknowledged commanding terminal information. Transmission control processing to be transmitted,
Causing the computer to
A program characterized by that.
(Appendix 2)
The transmission control process controls the transmitting unit when the receiving unit receives command response information (packet 6) transmitted by the commanding terminal in response to reception of the command start information. The program according to appendix 1, wherein the command information (packet 8) stored in the packet is transmitted.
(Appendix 3)
The transmission control process includes command end information transmitted from the transmitting terminal and indicating the end of transmission of the command information, the destination being the command information storage device (packet 13). When receiving the command, the transmission unit is controlled to transmit the command end information (packet 10) to the receiving terminal that is the destination when the command information is transmitted to the transmission unit. The program according to appendix 1.
(Appendix 4)
Based on the result of the reception confirmation confirmed by whether or not the command terminal has received confirmation information (packet 2) transmitted by the command terminal in response to reception of information transmitted from the command terminal. The supplementary note 1, wherein the transmission control process controls the transmission unit when the reception unit receives the unacknowledged command terminal information (packet 3) transmitted from the command terminal. program.
(Appendix 5)
When the transmission control process controls the transmission unit to transmit the command information (packet 8) to the command terminal, the transmission control process further controls the transmission unit to send the command information to the command command. The program according to appendix 4, wherein reception confirmation information (packet 18) indicating that the terminal has received is transmitted to the command terminal.
(Appendix 6)
The transmission control process is configured to control the transmission unit before transmitting the command information stored in the storage unit to the transmission unit, so that command start information (packet 5) indicating transmission start of the command information. Is transmitted to the commanding terminal specified by the reception-unconfirmed commanding terminal information.
(Appendix 7)
In the transmission control process, the reception unit transmits the unconfirmed reception instruction terminal information already obtained for transmission of information performed by the command terminal in the past, which the command terminal transmits prior to transmission of the command information. The program according to appendix 1, wherein the transmission unit is controlled when received.
(Appendix 8)
The transmission control process determines the urgency level (packet 12) of the command information received by the receiving unit, and when the command information is determined to be an urgency level equal to or greater than a predetermined threshold, the command information Before the reception unit receives the command end information (packet 13) indicating the end of the transmission of the command information, which is transmitted from the command terminal. The program according to appendix 1, wherein the command information (packet 8) determined to have the urgency level is preferentially transmitted to the receiving terminal.
(Appendix 9)
When the reception unit receives command information retransmission request information for requesting retransmission of the command information transmitted by any of the plurality of command terminals, the transmission unit And appending the command information stored in the storage unit to the one that has transmitted the command information retransmission request information among the plurality of receiving terminals. The program described.
(Appendix 10)
A command terminal, a plurality of command terminals, and a command information storage device that can communicate with each other via a communication network are provided, and the command information transmitted by the command terminal is shared by the command terminals. A command information storage device in a command system for receiving information,
Receiving means for receiving information sent from the communication network;
Transmitting means for transmitting predetermined information to the communication network;
Command information storage means for storing the command information;
Command information storage control means for storing the command information (packet 4) received by the receiving means in the command information storage means;
The unacknowledged command terminal information that is the information transmitted from the command terminal that identifies information that cannot be confirmed by the command terminal from among the plurality of command terminals. When the receiving means receives (packet 3), the transmitting means is controlled so that the command information stored in the command information storing means is identified by the unconfirmed receiving command terminal information. Transmission control means for sending to
A command information storage device characterized by comprising:
(Appendix 11)
Based on the result of the reception confirmation confirmed by whether or not the command terminal has received confirmation information (packet 2) transmitted by the command terminal in response to reception of information transmitted from the command terminal. Item 11. The supplementary note 10, wherein the transmission control unit controls the transmission unit when the reception unit receives the unconfirmed reception instruction terminal information (packet 3) transmitted from the command terminal. Command information storage device.
(Appendix 12)
The transmission control means transmits the reception unconfirmed command terminal information already obtained for transmission of information performed by the command terminal in the past, transmitted by the command terminal prior to transmission of the command information. The command information storage device according to appendix 10, wherein the transmission unit is controlled when the command is received.
(Appendix 13)
The transmission control means determines the urgency level (packet 12) of the command information received by the receiving means, and if the command information is determined to be an urgency level equal to or greater than a predetermined threshold, the command information The command means is controlled before the reception means receives the command end information (packet 13) transmitted from the command terminal and indicating the end of transmission of the command information. The command information storage device according to appendix 10, wherein the command information (packet 8) determined to have the urgency level is preferentially transmitted to the receiving terminal.
(Appendix 14)
The transmission control means, when the receiving means receives command information retransmission request information for requesting retransmission of the command information, transmitted from any of the plurality of command terminals, The command information stored in the command information storage means is transmitted to the command terminal that has transmitted the command information retransmission request information among the plurality of command terminals. The command information storage device according to 10.
(Appendix 15)
A command terminal, a plurality of command terminals, and a command information storage device that can communicate with each other via a communication network are provided, and the command information transmitted by the command terminal is shared by the command terminals. A command system for receiving information,
The command information storage device
Receiving means for receiving information sent from the communication network;
Transmitting means for transmitting predetermined information to the communication network;
Command information storage means for storing the command information;
Command information storage control means for storing the command information (packet 4) received by the receiving means in the command information storage means;
Have
The command terminal transmits unacknowledged command terminal information (packet 3) that is information that identifies information that cannot be confirmed by the command terminal from among the plurality of command terminals. Has an unacknowledged command terminal information transmission means,
The command information storage device controls the transmission unit when the reception unit receives the unconfirmed reception command terminal information (packet 3), and stores the command information stored in the command information storage unit. Further comprising transmission control means for transmitting to the command terminal specified by the unconfirmed command terminal information received,
A command system characterized by that.
(Appendix 16)
The command terminal has confirmation information transmitting means for transmitting predetermined confirmation information in response to reception of information transmitted from the command terminal,
The command terminal confirms whether or not the command terminal has received the information transmitted by the command terminal, and determines whether or not the command terminal has received the confirmation information transmitted from the command terminal. It further has a reception confirmation means for performing
The unconfirmed reception command terminal information transmission means transmits the unconfirmed reception command terminal information obtained based on the result of the confirmation by the reception confirmation means.
The command system according to supplementary note 15, wherein
(Appendix 17)
The reception unconfirmed command terminal information transmitting means transmits the reception unconfirmed command terminal information already obtained for the transmission of information performed by the command terminal prior to the command information being transmitted by the command terminal. And
The transmission control means, when the reception means receives the unconfirmed reception command terminal information transmitted by the command terminal prior to transmission of the command information by the command terminal. Control,
The command system according to supplementary note 15, wherein
(Appendix 18)
The command terminal further includes command end information transmitting means for transmitting command end information indicating the end of transmission of the command information following the command information,
The transmission control means determines the urgency level (packet 12) of the command information received by the receiving means, and if the command information is determined to be an urgency level equal to or greater than a predetermined threshold, the command end Prior to receiving the information (packet 13) by the receiving means, the transmitting means is controlled to give priority to the command information (packet 8) determined to be the urgency level equal to or higher than the predetermined threshold value to the receiving terminal. To send to,
The command system according to supplementary note 15, wherein
(Appendix 19)
The receiving terminal has command information retransmission request information transmitting means for transmitting command information retransmission request information, which is information for requesting retransmission of the command information,
The transmission control means controls the transmission means to store the command information when the reception means receives the command information retransmission request information transmitted by any of the plurality of command terminals. Transmitting the command information stored in the means to the command information retransmission request information among the plurality of receiving terminals,
The command system according to supplementary note 15, wherein

It is a figure which shows the whole structure of the command system which implements this invention. It is a figure which shows the specific structure of each component of the command system shown in FIG. It is a figure which shows the hardware structural example of the computer made to function as a command information storage device. It is a figure which shows the structure of an IP packet. It is a figure which shows the specific example (the 1) of the IP packet transmitted / received in the command system shown in FIG. It is a figure which shows the specific example (the 2) of the IP packet transmitted / received in the command system shown in FIG. It is the figure (the 1) which showed the processing content of the 1st example of the control processing with the flowchart. It is the figure (the 2) which showed the processing content of the 1st example of the control processing with the flowchart. It is the figure (the 3) which showed the processing content of the 1st example of the control processing with the flowchart. It is the figure (the 4) which showed the processing content of the 1st example of the control processing with the flowchart. It is the figure which showed the processing content of the 2nd example of the control processing with the flowchart. It is the figure (the 1) which showed the processing content of the 3rd example of the control processing with the flowchart. It is the figure (the 2) which showed the processing content of the 3rd example of the control processing with the flowchart. It is the figure which showed the processing content of the 4th example of the control processing with the flowchart. It is the figure which showed the processing content of the 5th example of the control processing with the flowchart. It is the figure which showed the processing content of the 6th example of the control processing with the flowchart. It is the figure which showed the processing content of the 7th example of the control processing with the flowchart. It is the figure which showed the processing content of the 8th example of the control processing with the flowchart. It is a figure which shows the structural example of the instruction | command system shown in FIG.

Explanation of symbols

1-19 IP packet 51 MPU
52 ROM
53 RAM
54 hard disk device 55 input device 56 display device 57 interface device 58 recording medium drive device 59 bus 60 portable recording medium 100 command terminal 110, 210, 310, 410 packet receiving unit 120, 220, 320, 420 packet transmitting unit 130, 230 , 330, 430 Protocol control unit 140, 240, 340 Command control unit 150, 250 Recording unit 160, 260 Recording unit 170, 270, 370 Operation unit 180, 280, 380 Display unit 200 Command information storage device 300 Command terminal 300a1, 300b1, 300c1 First command terminal 300a2, 300b2, 300c2 Second command terminal 350 Recorded data playback unit 360 Recorded data playback unit 400, 400a, 400b Router 440 Multicast control unit 500 IP network 61 0, 710 Command terminal management data 700 Command timing management data 800, 800a, 800b Multicast management data 900, 901 Headset 910, 911 Touch panel

Claims (6)

A computer program for functioning a command information storage device capable of communicating with a command terminal and a command terminal,
The command information storage device,
Storage means for receiving command information transmitted from the command terminal to the command terminal group by the command terminal and storing it in the storage unit;
From the command terminal group, command terminals that have not returned to the command terminal a signal indicating that the command terminal has transmitted information transmitted to the command terminal group in the past than the command information is transmitted. A receiving unit for receiving commanding terminal specifying information to be specified from the commanding terminal ;
When the receiving terminal has received the command terminal specifying information from the command terminal, the communication with the command terminal specified by the command terminal specifying information is attempted and communication is possible. A transmission unit for transmitting the command information stored in the storage unit to the command terminal;
A computer program characterized by functioning as a computer program. A computer program for functioning a command information storage device capable of communicating with a command terminal and a command terminal,
The command information storage device,
Storage means for receiving command information transmitted from the command terminal to the command terminal group by the command terminal and storing it in the storage unit;
From the command terminal, in the command terminal group, a receiving unit that receives information identifying a command terminal that has not returned a signal that received command information to the command terminal;
Transmitting the command information stored in the storage unit to the commanding terminal when communication with the commanding terminal that has not returned to the commanding terminal received by the receiving unit is attempted and communication is possible Function as a part , and
The command information storage device is made to function as an emergency level determination unit that determines the emergency level of the command information received by the storage unit, and
A command indicating the end of transmission of the series of command information, which is transmitted from the command terminal at the end of the series of command information when the emergency level determination means determines that the urgency level is equal to or greater than a predetermined threshold. Before the reception unit receives the end information, the command information storage device is caused to function so that the transmission unit transmits the command information determined to have an urgency level equal to or greater than the predetermined threshold.
A computer program characterized by the above. A command information storage device capable of communicating with a command terminal and a command terminal,
Storage means for receiving command information transmitted from the command terminal to the command terminal group by the command terminal and storing it in the storage unit;
From the command terminal group, command terminals that have not returned to the command terminal a signal indicating that the command terminal has transmitted information transmitted to the command terminal group in the past than the command information is transmitted. A receiving unit for receiving commanding terminal specifying information to be specified from the commanding terminal ;
When the receiving terminal has received the command terminal specifying information from the command terminal, the communication with the command terminal specified by the command terminal specifying information is attempted and communication is possible. A transmission unit for transmitting the command information stored in the storage unit to the command terminal;
A command information storage device. A command information storage device capable of communicating with a command terminal and a command terminal,
Storage means for receiving command information transmitted from the command terminal to the command terminal group by the command terminal and storing it in the storage unit;
From the command terminal, in the command terminal group, a receiving unit that receives information identifying a command terminal that has not returned a signal that received command information to the command terminal;
Transmitting the command information stored in the storage unit to the commanding terminal when communication with the commanding terminal that has not returned to the commanding terminal received by the receiving unit is attempted and communication is possible And
Urgency determination means for determining the urgency of the command information received by the storage means;
Have
A command indicating the end of transmission of the series of command information, which is transmitted from the command terminal at the end of the series of command information when the emergency level determination means determines that the urgency level is equal to or greater than a predetermined threshold. Prior to the reception unit receiving the end information, the transmission unit preferentially transmits the command information determined to be the urgency level equal to or greater than the predetermined threshold.
Command information storage device. The command terminal transmits command information to the command information storage device and the plurality of command terminals, and the command information storage device transmits the command to the command terminal that has not received the signal received from the command terminal. A communication system for transmitting information,
The command terminal is
Means for transmitting command information to the command terminal group, and means for transmitting to the command information storage device;
The command terminal is
Upon receiving command information from the command terminal, the command terminal has a means for returning a signal that received the command information,
The command information storage device is
Storing means for receiving command information from the command terminal and storing it in a storage unit;
The command terminal is
Means for identifying from the command terminal group the command terminal that has not sent back the signal that has received the information transmitted to the command terminal group in the past than the command information transmission ;
To the command information storage device further includes a means for transmitting a 受令terminal identification information for identifying受令terminal not reply the received signal command information the specific,
The command information storage device is
Wherein the command terminal, upon receiving the受令terminal identification information identifying the受令terminal not reply signals received command information the specific, attempts to communicate with the受令terminal not reply to finger-old terminal, communication When it becomes possible, it further has a transmission unit that transmits the command information stored in the storage unit to the command terminal.
Communications system. The command terminal transmits command information to the command information storage device and the plurality of command terminals, and the command information storage device transmits the command to the command terminal that has not received the signal received from the command terminal. A communication system for transmitting information,
The command terminal is
Means for transmitting command information to the command terminal group, and means for transmitting to the command information storage device;
The command terminal is
Upon receiving command information from the command terminal, the command terminal has a means for returning a signal that received the command information,
The command information storage device is
Storage means for receiving command information from the command terminal and storing it in a storage unit ;
Urgency level determination means for determining the urgency level of the command information received by the storage means ,
The command terminal is
Among the command terminal groups that have transmitted the command information, means for identifying the command terminal that does not return the signal that received the command information;
To the command information storage device, further comprising a means for transmitting information specifying the受令terminal not reply the received signal command information the specific,
The command information storage device is
From the command terminal receives the information identifying the受令terminal not reply signals received command information in which the said particular, attempts to communicate with the受令terminal not reply to finger-old terminal, the communication becomes possible, When the command information stored in the storage unit is transmitted to the command terminal, and the emergency level determination unit determines that the emergency level is equal to or greater than a predetermined threshold, The command information determined by the urgency level equal to or greater than the predetermined threshold before the receiving unit receives the command end information indicating the end of transmission of the series of command information transmitted from the command terminal. Further having a transmission section for transmitting with priority ,
Communications system.