JP6978070B2 - Communication device, forwarding destination change method and forwarding destination change program - Google Patents

Description

The present invention relates to a communication device, a transfer destination change method, and a transfer destination change program, and more particularly to a communication device that changes a data transfer destination, a transfer destination change method, and a transfer destination change program.

In recent years, with the widespread use of communication devices such as wireless LAN master units and wireless LAN repeaters, it has become possible to easily construct a wireless LAN environment using these communication devices. Generally, when a wireless LAN environment is constructed using a plurality of communication devices, the larger the number of communication devices used, the higher the possibility that the frequency bands used for communication will overlap and the communication will be congested.

Regarding this point, for example, in the wireless communication system disclosed in Patent Document 1, the wireless LAN repeater uses a frequency band different from the frequency band used for communication with the wireless LAN master unit, and the wireless LAN slave unit is used. It is intended to avoid congestion of wireless communication by communicating with.

Japanese Unexamined Patent Publication No. 2017-5462

However, the wireless communication system disclosed in Patent Document 1 cannot maintain communication when a communication failure occurs in the wireless LAN repeater, and another wireless LAN repeater or wireless LAN slave unit is used for wireless LAN. When connected to the master unit, there is a possibility that the frequency bands overlap and communication is congested, and there is a problem that good communication cannot be maintained.

In view of the above-mentioned problems, an object of the present invention is to obtain communication quality, communication speed, and security when a failure or congestion occurs in communication with at least one of a plurality of repeaters for which a communication connection has been established. It is an object of the present invention to provide a communication device, a transfer destination change method, and a transfer destination change program capable of maintaining communication while suppressing a decrease in the level as much as possible.

The communication device of the present invention is based on a monitoring unit that monitors whether a failure or congestion has occurred in communication with at least one repeater among a plurality of repeaters for which a communication connection has been established, and a first parameter. A first ranking unit that executes the first ranking process for ranking the plurality of repeaters, and a second ranking process for ranking the plurality of repeaters based on the second parameter. When a failure or congestion occurs in communication between the ranking unit of 2 and one or more repeaters, the transfer destination of the data to be transferred to the repeater related to the failure or congestion is set to the second rank. The second ranking unit includes a transfer destination changing unit that changes the ranking obtained in the assignment process to the highest repeater, and the second ranking unit is the first when the order based on the second parameter is the same. Priority is given to repeaters with higher rankings based on the parameters of.

According to the present invention, when a failure or congestion occurs in communication with at least one of a plurality of repeaters for which a communication connection has been established, deterioration of communication quality, communication speed, and security level is suppressed to the maximum. , A communication device capable of maintaining communication, a transfer destination change method, and a transfer destination change program can be provided.

It is a schematic diagram which shows one Embodiment of the communication system of this invention. It is a block diagram which shows the detailed structure of the communication apparatus which concerns on 1st Embodiment of this invention. It is a block diagram which shows the schematic structure of the communication apparatus which concerns on 1st Embodiment of this invention. It is a flowchart which shows the process which the communication apparatus which concerns on 1st Embodiment of this invention performs. It is a flowchart which shows one Embodiment of the 1st ranking process. It is a figure which shows one Embodiment of the repeater information table and the encryption method order table. It is a figure which shows one Embodiment of the 1st ranking table. It is a flowchart which shows one Embodiment of the SN ratio calculation process. It is a figure which shows one Embodiment of the communication status table. It is a flowchart which shows the 2nd ranking process. It is a figure which shows one Embodiment of the 2nd ranking table. It is a figure which shows one Embodiment of a routing table.

<First Embodiment>
Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a schematic diagram showing an embodiment of the communication system 100 of the present invention. The communication system 100 is a wireless LAN (Local Area Network) system including a communication device 10 and repeaters 20a, 20b, 20c. The communication device 10 is connected to a modem (not shown) connected to a telephone line or an optical line terminal device (not shown) connected to an optical line, and is connected to a network such as the Internet or a WAN (Wide Area Network). This is a wireless LAN router that routes communication data between various data servers (not shown) and the repeaters 20a, 20b, 20c. The communication device 10 can perform wireless data communication with an arbitrary number of repeaters. The communication device 10 can also perform wired data communication with an arbitrary number of repeaters.

The repeaters 20a, 20b, and 20c are connected to wireless communication devices such as smartphones, PCs, tablet terminals, home appliances, and sensors (hereinafter referred to as "slave units") capable of data communication via radio waves. It is a wireless LAN repeater that performs data communication via radio waves. The repeaters 20a, 20b, and 20c include a setting file in which the identification information of the slave unit that performs data communication with the own unit is set. The repeaters 20a, 20b, and 20c store the identification information of the slave unit in the setting file at the timing when the communication connection with the slave unit is established, and also store the identification information of the slave unit and the identification information of the own unit in the communication device. Provided to 10. Further, the repeaters 20a, 20b, and 20c each change the setting file according to the setting file change instruction from the communication device 10.

FIG. 2 is a block diagram showing a detailed configuration of the communication device 10 according to the first embodiment of the present invention. The communication device 10 includes a CPU (Central Processing Unit) 110, a PHY (Physical Layer) chip 120, a wireless interface (I / F) 130, and a storage device 140. The CPU 110, the PHY chip 120, the wireless I / F 130, and the storage device 140 are connected by wiring such as copper.

The CPU 110 is an arithmetic unit that executes various programs. The CPU 110 realizes the transfer destination change method of the present invention by expanding and executing the transfer destination change program of the present invention stored in the ROM (Read Only Memory) in a RAM (Random Access Memory). The CPU 110 executes a control unit 111, a connection processing unit 112, a first ranking unit 113, an SN ratio calculation unit 114, a second ranking unit 115, a transfer destination changing unit 116, and a monitoring unit 117, which are programs. .. The control unit 111 plays a central role in realizing the functions of the communication device 10, and calls a program described later to execute various processes.

The connection processing unit 112 is a program that executes processing related to communication connection with the repeaters 20a, 20b, 20c. The connection processing unit 112 constructs the repeater information table 141, the routing table 142, and the repeater and slave unit information table 143 in the storage device 140 when establishing the communication connection with the repeaters 20a, 20b, 20c. ..

As shown in FIG. 6, the repeater information table 141 shows the identification information of the repeater for which the communication connection with the communication device 10 is established, the encryption method used for the data communication with the repeater, and the data. It is a data table in which frequency bands and channels used in communication are registered in association with each other. In the present embodiment, the MAC address is registered in the repeater information table 141 as the repeater identification information.

As shown in FIG. 12, the routing table 142 is registered in association with the network address indicating the network to which the slave unit to which the data to be transferred belongs belongs and the identification information of the repeater that relays the data to be transferred. It is a data table. In the present embodiment, the IP address is registered in the routing table 142 as the identification information of the repeater.

The repeater and slave unit information table 143 is a data table in which the identification information of the repeater for which communication has been established with the communication device 10 and the identification information of the slave unit with which the repeater performs data communication are registered in association with each other. .. When establishing a communication connection with the repeaters 20a, 20b, 20c, the connection processing unit 112 requests the repeater for identification information of a slave unit with which the repeater performs data communication. When the connection processing unit 112 receives the identification information of the slave unit from the repeater, the connection processing unit 112 associates the identification information of the slave unit with the identification information of the repeater and registers the identification information in the repeater and the slave unit information table 143.

The first ranking unit 113 is a program that executes the first ranking process for ranking the repeaters 20a, 20b, and 20c based on the first parameter. In this embodiment, as the first parameter, an encryption method used in data communication with a repeater is used. The first ranking unit 113 can rank the repeaters 20a, 20b, 20c including the repeater in which the communication failure or congestion has occurred. In this case, the rank of the repeater in which the communication failure or congestion has occurred can be the lowest. Alternatively, the first ranking unit 113 may rank the repeaters 20a, 20b, 20c other than the repeaters in which the communication failure or congestion has occurred.

When the first ranking unit 113 is called from the control unit 111, the repeater information table 141 is used to generate the first ranking table 145 as shown in FIG. 7. In the first ranking table 145, the identification information of the repeater for which the communication connection with the communication device 10 is established, the encryption method used in the data communication with the repeater, and the priority of the encryption method are displayed. It is a data table that is associated and registered. At the time of generation of the first ranking table 145, no data is input to the priority column of the encryption method.

When the first ranking unit 113 generates the first ranking table 145, the first ranking unit 113 refers to the encryption method ranking table 144 as shown in FIG. 6, and is based on the priority of the encryption method which is the first parameter. Determine the priority of the repeater indicated by the repeater identification information. The encryption method order table 144 is a data table in which the encryption method that can be used by the repeater and the priority order of the encryption method are registered in association with each other. In this embodiment, the priority is defined based on the security level and the encryption speed of the encryption method. If the communication data is not encrypted, the lowest priority is assigned.

The SN ratio calculation unit 114 is a program for calculating the SN ratio related to communication with the repeater. When the SN ratio calculation unit 114 is called from the control unit 111, the repeater information table 141 is used to generate a communication status table 146 as shown in FIG. The communication status table 146 shows the identification information of the repeater for which the communication connection with the communication device 10 is established, the RSSI (Received Signal Strength Indication) measured value (dBm) related to the data communication with the repeater, and the noise measured value. (DBm) and the SN ratio (dB) are registered in association with each other. At the time of generation of the communication status table 146, no data is input to the RSSI, noise, and SN ratio priority columns.

The SN ratio calculation unit 114 refers to the communication status table 146 to specify a repeater for which the SN ratio has not been calculated, and then refers to the repeater information table 141 to specify the channel used by the repeater. .. Next, the SN ratio calculation unit 114 transmits an RSSI measurement request requesting RSSI measurement and a noise measurement request requesting noise measurement to the RSSI measurement unit 123 and the noise measurement unit 124 included in the PHY chip 120, respectively. .. The channel identification information used by the repeater is added to the RSSI measurement request and the noise measurement request. When the SN ratio calculation unit 114 receives the RSSI measurement value and the noise measurement value from the RSSI measurement unit 123 and the noise measurement unit 124, the SN ratio calculation unit 114 registers these measurement values in the communication status table 146. Then, the SN ratio calculation unit 114 calculates the SN ratio by subtracting the noise measurement value from the RSSI measurement value, and registers the SN ratio in the communication status table 146.

The second ranking unit 115 is a program that executes a second ranking process for ranking the repeaters 20a, 20b, and 20c based on the second parameter. In this embodiment, as the second parameter, the SN ratio related to data communication with the repeater is used. The second ranking unit 115 can rank the repeaters 20a, 20b, 20c including the repeater in which the communication failure or congestion has occurred. In this case, the rank of the repeater in which the communication failure or congestion has occurred can be the lowest. Alternatively, the second ranking unit 115 may rank the repeaters 20a, 20b, 20c other than the repeaters in which the communication failure or congestion has occurred.

When the second ranking unit 115 is called from the control unit 111, the repeater information table 141 and the communication status table 146 are used to generate a second ranking table 147 as shown in FIG. The second ranking table 147 shows the identification information of the repeater for which the communication connection with the communication device 10 is established, the priority of the repeater, and the RSSI, noise, and SN ratio related to the communication with the repeater. , A data table in which the encryption method used in data communication with the repeater is associated and registered. At the time of generation of the second ranking table 147, no data is input to the priority column.

When the second ranking unit 115 generates the second ranking table 147, the second ranking unit 115 determines the priority of the repeater based on the magnitude of the SN ratio, which is the second parameter, and sets the priority to the second ranking. Register in the attached table 147. When the SN ratios are the same, the second ranking unit 115 refers to the first ranking table 145 and ranks the repeater having the higher priority based on the first parameter as the higher repeater.

The transfer destination changing unit 116 is a program that changes the transfer destination of the data received by the communication device 10. More specifically, when a failure or congestion occurs in communication with one or more repeaters, the transfer destination changing unit 116 sets the transfer destination of the data to be transferred to the repeater related to the failure or congestion. The ranking obtained by the ranking process of 2 is changed to the highest repeater. For example, in the example shown in FIG. 12, the repeater identified by the IP address "192.168.1.30" has a failure or congestion, and the slave unit to which the data is transferred to the repeater is the destination. A repeater belonging to the network identified by the network address "192.168.1.3" and identified by the IP address "192.168.1.10" was obtained by the second ranking process. It is assumed that the repeater has the highest ranking. In this case, the transfer destination changing unit 116 sets the IP address of the repeater related to the network address "192.168.1.3" from "192.168.1.30" to "192.168.1.10". And update the routing table 142.

The monitoring unit 117 is a program for monitoring whether or not a failure or congestion has occurred in communication with at least one of the plurality of repeaters for which a communication connection has been established. The monitoring unit 117 periodically sends a request for confirming that the communication connection is maintained to the repeater for which the communication connection has been established. If there is no response from the repeater to which the request is transmitted, the monitoring unit 117 determines that a failure has occurred in communication with the repeater, and notifies the control unit 111 of a failure occurrence event indicating that effect. The failure occurrence event includes the identification information of the repeater.

Further, the monitoring unit 117 monitors the congestion occurrence event issued by the data transfer amount monitoring unit 122 of the PHY chip 120. The congestion occurrence event is an event indicating that congestion has occurred in communication using a specific frequency band, and includes identification information of the channel in which congestion is occurring. When the monitoring unit 117 detects a congestion occurrence event, the monitoring unit 117 notifies the control unit 111 of the congestion occurrence event.

The PHY chip 120 is a semiconductor integrated circuit that executes processing of a physical layer, which is the first layer of the OSI reference model. The PHY chip 120 is arranged between the CPU 110 and the wireless I / F 130, and performs processing such as data serialization and parallelization, D / A conversion of electric signals, A / D conversion, and amplification. Further, the PHY chip 120 includes a data transmission / reception unit 121, a data transfer amount monitoring unit 122, an RSSI measurement unit 123, and a noise measurement unit 124.

The data transmission / reception unit 121 is a logic circuit for transmitting / receiving data to be communicated with an external device such as a repeater 20a, 20b, 20c or a modem. The data transmission / reception unit 121 is arranged between the CPU 110 and the wireless I / F 130, transfers the data received from the wireless I / F 130 to the CPU 110, and transfers the data received from the CPU 110 to the wireless I / F 130.

The data transfer amount monitoring unit 122 is a logic circuit that monitors the amount of data transferred by the data transmission / reception unit 121 per unit time. The data transfer amount monitoring unit 122 monitors the data transfer amount per unit time for each channel constituting the frequency band used for wireless communication, and when the data transfer amount exceeds a predetermined threshold, the frequency band is changed. It is determined that congestion has occurred in the communication used, and a congestion occurrence event indicating that effect is transmitted to the monitoring unit 117 of the CPU 110.

The RSSI measurement unit 123 is a logic circuit that measures RSSI in communication with the repeaters 20a, 20b, and 20c. When the RSSI measurement unit 123 receives an RSSI measurement request for which the channel to be used by the repeaters 20a, 20b, 20c is specified from the SN ratio calculation unit 114, the RSSI measurement unit 123 measures the RSSI of the channel, and the RSSI measurement value which is the measurement result. Is provided to the SN ratio calculation unit 114.

The noise measuring unit 124 is a logic circuit that measures noise in communication with the repeaters 20a, 20b, 20c. When the noise measurement unit 124 receives a noise measurement request for which the channels used by the repeaters 20a, 20b, 20c are specified from the SN ratio calculation unit 114, the noise measurement unit 124 measures the noise of the channel, and the noise measurement value which is the measurement result. Is provided to the SN ratio calculation unit 114.

The wireless I / F 130 transmits the analog signal received from the PHY chip 120 to the repeaters 20a, 20b, 20c via radio, and supplies the analog signal received from these repeaters to the PHY chip 120.

The storage device 140 is a storage device in which various data, programs, and data tables are stored, and can be configured by a ROM or RAM. In the storage device 140, the above-mentioned repeater information table 141, routing table 142, repeater and slave unit information table 143, encryption method order table 144, first ordering table 145, communication status table 146 and second order The routing table 147 is constructed.

FIG. 3 is a block diagram showing a main program included in the communication device 10 according to the first embodiment. The communication device 10 includes, as a main program, the above-mentioned first ranking unit 113, a second ranking unit 115, a transfer destination changing unit 116, and a monitoring unit 117.

FIG. 4 is a flowchart showing a process executed by the communication device 10 according to the first embodiment of the present invention. The process shown in FIG. 4 is executed when a failure or congestion occurs in communication with one or a plurality of repeaters. The process shown in FIG. 4 starts from step S100 when the control unit 111 is notified of the failure occurrence event or the congestion occurrence event from the monitoring unit 117. In step S101, the control unit 111 refers to the routing table 142 and counts the repeaters for which the communication connection with the communication device 10 is established. In step S102, the control unit 111 determines whether or not the number of repeaters counted in step S101 is 1 or less. That is, it is determined whether or not the number of repeaters for which communication connection with the communication device 10 is established is one or less. If the number of repeaters is 1 or less (YES), the process ends in step S108. On the other hand, when the number of repeaters is 2 or more (NO), the process proceeds to step S103.

In step S103, the control unit 111 calls the first ranking unit 113, and the first ranking unit 113 executes the first ranking process described in detail with reference to FIG. In step S104, the control unit 111 calls the SN ratio calculation unit 114, and the SN ratio calculation unit 114 executes the SN ratio calculation process described in detail with reference to FIG. In step S105, the control unit 111 calls the second ranking unit 115, and the second ranking unit 115 executes the second ranking process described in detail with reference to FIG. In step S106, the control unit 111 calls the transfer destination change unit 116, and the transfer destination change unit 116 refers to the second ranking table to identify the highest-level repeater, and in the routing table 142, a failure or failure occurs. The transfer destination of the data transferred to the repeater related to congestion is changed to the highest-level repeater. In step S107, the control unit 111 refers to the repeater and slave unit information table 143 to identify the slave unit identification information associated with the repeater identification information related to the failure or congestion, and the slave unit. The identification information of is added to the setting file change instruction, the setting file change instruction is transmitted to the highest-level repeater, and the process ends in step S108.

FIG. 5 is a flowchart showing an embodiment of the first ranking process. FIG. 5 starts from step S200, and in step S201, the first ranking unit 113 generates the first ranking table 145 by using the repeater information table 141. In step S202, the first ranking unit 113 refers to the first ranking table 145, selects one non-ranked repeater, that is, a repeater whose priority is not registered, and at the same time, Specify the encryption method used by the repeater. In step S203, the first ranking unit 113 refers to the encryption method ranking table 144 and specifies the priority of the encryption method used by the selected repeater. In step S204, the first ranking unit 113 associates the priority of the specified encryption method with the identification information of the repeater and registers it in the first ranking table 145. In step S205, the first ranking unit 113 refers to the priority column of the first ranking table 145 and determines whether or not the ranking of all the repeaters has been completed. If the ranking of all repeaters has not been completed (NO), the process returns to step S201. On the other hand, when the ranking of all the repeaters is completed (YES), the process is completed in step S206.

FIG. 8 is a flowchart showing an embodiment of the SN ratio calculation process. FIG. 8 starts from step S300, and in step S301, the SN ratio calculation unit 114 uses the repeater information table 141 to generate the communication status table 146. In step S302, the SN ratio calculation unit 114 refers to the communication status table 146 and identifies a repeater for which the SN ratio has not been calculated. In step S303, the SN ratio calculation unit 114 refers to the first ranking table 145 and identifies the repeater having the highest priority according to the first ranking among the repeaters for which the SN ratio has not been calculated. do. In step S304, the SN ratio calculation unit 114 causes the RSSI measurement unit 123 to measure RSSI (dBm) in communication with the highest-level repeater, and registers the RSSI (dBm) in the communication status table 146. In step S305, the SN ratio calculation unit 114 causes the noise measurement unit 124 to measure the noise (dBm) in communication with the highest-level repeater, and registers the noise (dBm) in the communication status table 146.

In step S306, the SN ratio calculation unit 114 subtracts the noise (dBm) measured in step S305 from the RSSI (dBm) measured in step S304, so that the SN ratio (dB) relating to the communication with the highest repeater is obtained. ) Is calculated and registered in the communication status table 146. In step S307, the SN ratio calculation unit 114 refers to the communication status table 146 and determines whether or not the SN ratios of all the repeaters have been calculated. If the SN ratio has not been calculated for all the repeaters (NO), the process returns to step S301. On the other hand, when the SN ratio is calculated for all the repeaters (YES), the process ends in step S308.

FIG. 10 is a flowchart showing an embodiment of the second ranking process. FIG. 10 starts from step S400, and in step S401, the second ranking unit 115 generates the second ranking table 147 by using the repeater information table 141 and the communication status table 146. In step S402, the second ranking unit 115 initializes the variable X that defines the priority with “1”. In step S403, the second ranking unit 115 refers to the second ranking table 147 and identifies the repeater having the highest SN ratio among the repeaters whose priority has not been registered. In step S404, the second ranking unit 115 determines whether or not the number of specified repeaters is two or more. When the number of the specified repeaters is not 2 or more, that is, when the number of the specified repeaters is 1 (NO), the process proceeds to step S406. On the other hand, when the number of specified repeaters is 2 or more (YES), that is, when there are a plurality of repeaters having the same SN ratio, the process proceeds to step S405.

In step S405, the second ranking unit 115 refers to the first ranking table 145 and identifies a repeater having a higher priority based on the first ranking process. In step S406, the second ranking unit 115 registers the value of the variable X in the second ranking table 147 as the priority of the specified repeater. In step S407, the second ranking unit 115 refers to the priority column of the second ranking table 147 and determines whether or not the priority is registered for all the repeaters, thereby relaying all the relays. Determine if the ranking of the aircraft has been completed. If the ranking of all the repeaters has not been completed (NO), the process proceeds to step S408. In step S408, the second ranking unit 115 increments the variable X, and the process returns to step S403. On the other hand, when the ranking of all the repeaters is completed (YES), the process is completed in step S409.

In the first embodiment, the following effects are obtained. When a failure or congestion occurs in communication with the repeaters 20a, 20b, 20c, the first ranking unit 113 executes the first ranking process based on the encryption method which is the first parameter, and the second ranking process is performed. The ranking unit 115 of the above performs the second ranking process based on the SN ratio which is the second parameter. Then, the transfer destination changing unit 116 updates the routing table 142, and the transfer destination of the data transferred to the repeater related to the failure or congestion has the highest order obtained in the second ranking process. Change to a repeater. As a result, when a failure or congestion occurs in communication with at least one of the plurality of repeaters for which a communication connection has been established, it is possible to maintain communication while minimizing the deterioration of communication quality. can.

Further, when the ranking based on the SN ratio, which is the second parameter, is the same, the second ranking unit 115 gives priority to the repeater having the higher ranking based on the encryption method, which is the first parameter. As a result, when a failure or congestion occurs in communication with at least one of the plurality of repeaters for which a communication connection has been established, not only the communication quality but also the communication speed and the security level are maximized. Communication can be maintained while limiting the limit.

<Second embodiment>
In the second embodiment, the communication device 10 can include a display control unit that displays a screen showing the ranking results of the plurality of repeaters on the display device. More specifically, the display control unit may use, for example, the information (repeater identification information, priority, RSSI measurement value, noise measurement value, SN ratio, encryption method) included in the second ranking table as shown in FIG. Etc.) can be displayed on the display device. The display device may be a display device included in the communication device 10, a display device of a communication terminal (smartphone, PC, taglet type terminal, etc.) capable of communicating with the communication device 10, and the like.

In the second embodiment, the following effects are obtained. The display control unit displays the second ranking table generated as a result of the second ranking process on the display device. As a result, the user can easily grasp the repeaters for which the communication connection with the communication device 10 is established, and can easily confirm the priority, the communication quality, and the encryption method of these repeaters.

<Other embodiments>
In the first embodiment, the encryption method is used as the first parameter and the SN ratio is used as the second parameter, but in the other embodiment, the SN ratio is used as the first parameter and the second parameter is used. Cryptography may be used as a parameter. As a result, communication can be maintained by giving priority to the security level and the encryption speed.

Further, the communication device 10 may provide an interface such as a GUI for the user to select the first parameter and the second parameter. In this case, the CPU 110 includes an input unit that accepts user instructions, and accepts the first parameter and the second parameter specified by the user. The first ranking unit 113 and the second ranking unit 115 execute the ranking process based on the first parameter and the second parameter specified by the user, respectively. As a result, the user can rank the repeaters based on the parameters selected by the user.

Further, as the first parameter or the second parameter, the amount of data transfer per unit time for each channel may be used. In this case, the first ranking unit 113 or the second ranking unit 115 acquires the data transfer amount per unit time for each channel from the data transfer amount monitoring unit 122, and the first ranking process and the second ranking unit 115, respectively. The ranking process of 2 is executed. At this time, the first ranking unit 113 and the second ranking unit 115 give priority to the channel having a small amount of data transfer. As a result, it is possible to effectively utilize the frequency band to avoid mixing of communications, and it is possible to maintain communication.

Further, as a third parameter, the amount of data transfer per unit time for each channel may be used. In this case, the second ranking unit 115 acquires the data transfer amount per unit time for each channel from the data transfer amount monitoring unit 122, and ranks the repeaters based on the data transfer amount. As a result, when there are repeaters having the same priority, the second ranking unit 115 can give priority to the repeater having a large SN ratio. Further, when the SN ratio is the same, the second ranking unit 115 can give priority to the repeater having a higher order by the encryption method. As a result, it is possible to effectively utilize the frequency band to avoid the mixture of communications, and it is possible to maintain the communication while suppressing the deterioration of the communication quality, the communication speed, and the security level to the maximum.

In the above example, the program can be stored and provided to a computer using various types of non-transitory computer readable medium. Non-temporary computer-readable media include various types of tangible storage media. Examples of non-temporary computer-readable media include magnetic recording media (eg, flexible disks, magnetic tapes, hard disk drives), magneto-optical recording media (eg, magneto-optical disks), CD-ROMs, CD-Rs, CD-Rs. / W, including semiconductor memory (for example, mask ROM, PROM (Programmable ROM), EPROM (Erasable PROM), flash ROM, RAM). The program may also be provided to the computer by various types of transient computer readable medium. Examples of temporary computer-readable media include electrical, optical, and electromagnetic waves. The temporary computer-readable medium can supply the program to the computer via a wired communication path such as an electric wire and an optical fiber, or a wireless communication path.

The present invention is not limited to the above-described embodiment, and can be appropriately modified without departing from the spirit of the present invention.

10 Communication device 20a Repeater 20b Repeater 20c Repeater 100 Communication system 113 First ranking unit 115 Second ranking unit 116 Transfer destination changing unit 117 Monitoring unit

Claims (13)

A monitoring unit that monitors whether a failure or congestion has occurred in communication with at least one of the plurality of repeaters for which a communication connection has been established.
A first ranking unit that executes a first ranking process for ranking the plurality of repeaters based on the first parameter.
A second ranking unit that executes a second ranking process for ranking the plurality of repeaters based on the second parameter.
When a failure or congestion occurs in communication with one or more repeaters, the transfer destination of the data to be transferred to the repeater related to the failure or congestion is the order obtained in the second ranking process. Equipped with a transfer destination change unit that changes to the highest repeater,
The second ranking unit gives priority to a repeater having a higher order based on the first parameter when the order based on the second parameter is the same.
The first parameter includes the encryption method used by each of the plurality of repeaters.
A communication device , wherein the second parameter includes a signal-to-noise ratio for communication with each of the plurality of repeaters. A monitoring unit that monitors whether a failure or congestion has occurred in communication with at least one of the plurality of repeaters for which a communication connection has been established.
A first ranking unit that executes a first ranking process for ranking the plurality of repeaters based on the first parameter.
A second ranking unit that executes a second ranking process for ranking the plurality of repeaters based on the second parameter.
When a failure or congestion occurs in communication with one or more repeaters, the transfer destination of the data to be transferred to the repeater related to the failure or congestion is the order obtained in the second ranking process. With the transfer destination change part that changes to the highest repeater
Equipped with
The second ranking unit gives priority to a repeater having a higher order based on the first parameter when the order based on the second parameter is the same.
The first parameter includes the signal-to-noise ratio for communication with each of the plurality of repeaters.
The second parameter includes a communication device including an encryption method used by each of the plurality of repeaters. The first parameter or the second parameter includes the amount of data transfer per unit time of the channel used by each of the plurality of repeaters.
The communication device according to claim 1 or 2, wherein the first ranking unit and the second ranking unit give priority to the channel having a small amount of data transfer. The second ranking unit ranks the plurality of repeaters based on the amount of data transfer per unit time of the channel used by each of the plurality of repeaters, which is the third parameter.
The communication device according to claim 1 or 2, wherein the second ranking unit gives priority to a repeater having a higher order based on the second parameter when the order based on the third parameter is the same. The communication device according to any one of claims 1 to 4 , further comprising a display control unit that displays a screen showing the ranking results of the plurality of repeaters on the display device. It is a method of changing the transfer destination to change the data transfer destination.
A step in which a communication device monitors whether a failure or congestion has occurred in communication with at least one of a plurality of repeaters for which a communication connection has been established.
A step in which the communication device executes a first ranking process for ranking the plurality of repeaters based on the first parameter.
A step in which the communication device executes a second ranking process for ranking the plurality of repeaters based on the second parameter.
When a failure or congestion occurs in communication with one or a plurality of repeaters, the communication device assigns a transfer destination of data transferred to the repeater related to the failure or congestion to the second ranking process. The step to change to the highest repeater in the ranking obtained in
Only including,
The first parameter includes the encryption method used by each of the plurality of repeaters.
A method for changing a transfer destination, wherein the second parameter includes an SN ratio for communication with each of the plurality of repeaters. It is a method of changing the transfer destination to change the data transfer destination.
A step in which a communication device monitors whether a failure or congestion has occurred in communication with at least one of a plurality of repeaters for which a communication connection has been established.
A step in which the communication device executes a first ranking process for ranking the plurality of repeaters based on the first parameter.
A step in which the communication device executes a second ranking process for ranking the plurality of repeaters based on the second parameter.
When a failure or congestion occurs in communication with one or a plurality of repeaters, the communication device assigns a transfer destination of data transferred to the repeater related to the failure or congestion to the second ranking process. The step to change to the highest repeater in the ranking obtained in
Including
The first parameter includes the signal-to-noise ratio for communication with each of the plurality of repeaters.
The second parameter is a transfer destination changing method including an encryption method used by each of the plurality of repeaters. The first parameter or the second parameter includes the amount of data transfer per unit time of the channel used by each of the plurality of repeaters.
The transfer destination changing method according to claim 6 or 7, wherein the communication device gives priority to the channel having a small amount of data transfer in the first ranking process or the second ranking process. A step of ranking the plurality of repeaters based on the data transfer amount per unit time of the channel used by each of the plurality of repeaters, which is a third parameter.
The transfer destination changing method according to claim 6 or 7, wherein when the order based on the third parameter is the same, the communication device includes a step of giving priority to a repeater having a higher order based on the second parameter. .. A redirection program executed by the communication device, to said communication device,
A step of monitoring whether a failure or congestion has occurred in communication with at least one of a plurality of repeaters for which a communication connection has been established.
A step of executing the first ranking process of ranking the plurality of repeaters based on the first parameter, and
A step of executing a second ranking process for ranking the plurality of repeaters based on the second parameter, and
When a failure or congestion occurs in communication with one or more repeaters, the transfer destination of the data to be transferred to the repeater related to the failure or congestion is the order obtained in the second ranking process. but only including the step of changing the relay machine of the top-level,
The first parameter includes the encryption method used by each of the plurality of repeaters.
The second parameter is a transfer destination change program including an SN ratio for communication with each of the plurality of repeaters. A transfer destination change program executed in a communication device for the communication device.
A step of monitoring whether a failure or congestion has occurred in communication with at least one of a plurality of repeaters for which a communication connection has been established.
A step of executing the first ranking process of ranking the plurality of repeaters based on the first parameter, and
A step of executing a second ranking process for ranking the plurality of repeaters based on the second parameter, and
When a failure or congestion occurs in communication with one or more repeaters, the transfer destination of the data to be transferred to the repeater related to the failure or congestion is the order obtained in the second ranking process. Including the step of changing to the top repeater
The first parameter includes the signal-to-noise ratio for communication with each of the plurality of repeaters.
The second parameter is a transfer destination change program including an encryption method used by each of the plurality of repeaters. The first parameter or the second parameter includes the amount of data transfer per unit time of the channel used by each of the plurality of repeaters.
The transfer destination change program according to claim 10 or 11, which gives priority to the channel having a small amount of data transfer in the first ranking process or the second ranking process for the communication device. For the communication device
A step of ranking the plurality of repeaters based on the amount of data transfer per unit time of the channel used by each of the plurality of repeaters, which is a third parameter.
The transfer destination change program according to claim 10 or 11, wherein when the order based on the third parameter is the same, the step of giving priority to the repeater having the higher order based on the second parameter is executed.

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