JP4909031B2 - Communication relay device, communication control device, communication method, communication program, and communication system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To save power consumption in a communication terminal and improve reliability of a communication system. <P>SOLUTION: A communication relay device relating to this invention comprises a connection request receiving unit for receiving a connection request for requesting a session establishment through a communication control device for establishing a session between a source terminal and a destination terminal; a notification information transmission unit for sending notification information to the destination terminal for notifying the destination terminal that the connection request receiving unit receives the request to connect to the destination terminal when the connection request receiving unit receives the connection request; an acknowledgement response receiving unit for receiving an acknowledgement response indicating that the destination terminal receives the notification information; and an acknowledgement response transmission unit for sending the acknowledgement response to the communication control device after the connection request receiving unit receives the connection request, and before the acknowledgement response receiving unit receives the acknowledgement response from the destination terminal. <P>COPYRIGHT: (C)2008,JPO&amp;INPIT

Description

  The present invention relates to a communication relay device, a communication control device, a communication method, a communication program, and a communication system. In particular, the present invention relates to a communication relay device that relays communication between a calling terminal and a called terminal, a communication control device that establishes a session between the calling terminal and the called terminal, a communication method, a communication program, and a communication system. .

Non-Patent Document 1 describes a power management function for suppressing the battery consumption of a wireless terminal. That is, in IEEE 802.11, a power saving method using a Beacon Interval and a Listen Interval from an access point is defined in a wireless LAN section.
Hideaki Matsue and Masahiro Morikura, “802.11 High-Speed Wireless LAN Textbook”, IDG Japan, July 29, 2003, p. 90-95

  However, when the beacon interval set for an access point is increased, the beacon interval is increased for all wireless terminals communicably connected to the access point. It may be difficult to provide services that maintain quality. In addition, when the listen interval is individually set in each wireless terminal, the responsiveness of communication may be reduced, and a recording area for recording data transmitted from the originating wireless terminal to the terminating wireless terminal It may be difficult to ensure the above.

  Further, when a power saving period is provided in the wireless terminal, when the wireless terminal is in the power saving period, a connection request cannot be received from another wireless terminal and a provisional response to the connection request cannot be returned. In some cases, it is necessary to repeat retransmission of the connection request to the wireless terminal. In such a case, communication traffic may increase and processing load on the communication control device and the network may increase. Such a problem can be more prominent when the power saving period in the wireless terminal is set longer. In addition, if the power saving period in the wireless terminal is lengthened, the immediate responsiveness may be reduced, and the reliability of communication with the user may be reduced.

  Then, an object of this invention is to provide the communication relay apparatus, communication control apparatus, communication method, communication program, and communication system which can solve the said subject. This object is achieved by a combination of features described in the independent claims. The dependent claims define further advantageous specific examples of the present invention.

  In order to solve the above problems, in the first embodiment of the present invention, a communication relay device relays communication between a calling terminal and a called terminal, and establishes a session between the calling terminal and the called terminal. A connection request receiving unit that receives a connection request for requesting establishment of a session between the calling terminal and the called terminal via the communication control device to be received, and the connection request receiving unit receives the connection request In addition, a notification information for notifying the destination terminal that the connection request for the destination terminal has been received, a notification information transmitting unit for transmitting to the destination terminal, and a confirmation response indicating that the destination terminal has received the notification information An acknowledgment reception unit that receives from the destination terminal and a connection request reception unit that receives the connection request, and then transmits an acknowledgment to the communication control device before the confirmation response reception unit receives an acknowledgment from the destination terminal. A confirmation response transmission unit.

  In addition, when the confirmation response transmission unit transmits the confirmation response to the communication control device before the confirmation response reception unit receives the confirmation response from the destination terminal, the confirmation response reception unit receives the confirmation response from the destination terminal. Later, the confirmation response is not transmitted to the communication control device. In addition, when the communication control device does not receive a confirmation response from the communication relay device in response to the connection request, the communication control device repeatedly transmits the connection request to the communication relay device at a predetermined time interval. The confirmation response may be transmitted to the communication control apparatus from when the connection request receiving unit receives the connection request until a predetermined time interval elapses.

  Further, in the second embodiment of the present invention, a communication method for relaying communication between a calling terminal and a called terminal via a communication control device that establishes a session between the calling terminal and the called terminal. When a connection request is received at the connection request reception stage, and the connection request reception stage is received from the calling terminal, a connection request for requesting establishment of a session between the calling terminal and the called terminal is received. A notification information transmission stage for transmitting notification information for notifying the destination terminal that the connection request has been received is transmitted to the destination terminal, and a confirmation response indicating that the destination terminal has received the notification information is received from the destination terminal. An acknowledgment transmission step of transmitting an acknowledgment response to the communication control device after receiving a connection request in the acknowledgment response receiving step and before receiving an acknowledgment response from the destination terminal in the acknowledgment response receiving phase. Stage and Provided.

  According to a third aspect of the present invention, there is provided a communication program for a communication relay device that relays communication between a calling terminal and a called terminal, wherein the communication relay device is connected between the calling terminal and the called terminal. A connection request receiving unit that receives a connection request for requesting establishment of a session between the calling terminal and the called terminal via the communication control device that establishes the session, and the connection request receiving unit receives the connection request. Notification information sending unit for sending notification information to the called terminal to notify the called terminal that the connection request for the called terminal has been received, and a confirmation response indicating that the called terminal has received the notification information After receiving the connection request after the connection request receiving unit receives the connection request and before the confirmation response receiving unit receives the confirmation response from the destination terminal. Function as an acknowledgment transmitter Make.

  Further, in the fourth embodiment of the present invention, a communication comprising a communication control device that establishes a session between a calling terminal and a called terminal, and a communication relay device that relays communication between the calling terminal and the called terminal. The communication relay device issues a connection request for requesting establishment of a session between a calling terminal and a called terminal via a communication control device that establishes a session between the calling terminal and the called terminal. When the connection request receiving unit receives the connection request from the receiving terminal and the connection request receiving unit receives notification information for notifying the receiving terminal that the connection request for the receiving terminal has been received. Notification information transmitting unit, confirmation response indicating that the receiving terminal has received the notification information, an acknowledgment receiving unit that receives from the receiving terminal, and the connection request receiving unit receiving the connection request, and then receiving the confirmation response Is the receiving terminal Before receiving, and a confirmation response transmitter that transmits an acknowledgment to the communication control device.

  In the fifth embodiment of the present invention, the communication control device establishes a session between the calling terminal and the called terminal, and the called terminal receives a data in a standby mode in which data is not received and communication in which data is received. After the transition to the standby mode, when the standby period preset in the destination terminal elapses, the communication control apparatus transitions to the communication mode, and the communication control device sets the length of the standby period preset in the destination terminal. A waiting period information storage unit for storing waiting period information indicating the length, a connection request receiving unit for receiving a connection request for requesting establishment of a session between the calling terminal and the called terminal, and a connection request. When the connection request transmission unit that transmits to the destination terminal and the connection request reception unit receive the connection request, the connection request transmission unit transmits the connection request to the destination terminal, and the connection request transmission unit connects. When a request is sent to the called terminal Connection request transmission control unit that causes the connection request transmission unit to retransmit the connection request to the destination terminal when the standby period indicated by the standby period information stored in the standby period information storage unit has elapsed. With.

  Further, in the sixth aspect of the present invention, the communication mode has a standby mode in which no data is received and a communication mode in which data is received, and after the transition to the standby mode, when the preset standby period elapses, the communication mode A standby communication method for establishing a session between a callee terminal and a callee terminal that transition to, and storing standby period information indicating a length of a standby period preset in the callee terminal in a standby period information storage unit A period information storage stage, a connection request reception stage for receiving a connection request for requesting establishment of a session between the calling terminal and the called terminal from the calling terminal, and a connection request for transmitting the connection request to the called terminal When a connection request is received in the transmission stage and the connection request reception stage, the connection request is transmitted to the destination terminal, and the standby is performed from when the connection request is transmitted to the destination terminal in the connection request transmission stage. If the waiting period of the standby period information is the length shown that between information storage unit has stored has elapsed, and a connection request transmission control step of transmitting again the connection request to the called terminal.

  Further, in the seventh aspect of the present invention, the communication mode has a standby mode in which data is not received and a communication mode in which data is received. When a preset standby period elapses after transition to the standby mode, the communication mode A communication program for a communication control device that establishes a session between a callee terminal and a callee terminal that transitions to a standby period information that indicates a length of a standby period set in advance in the callee terminal A waiting period information storage unit for storing a connection request, a connection request receiving unit for receiving a connection request for requesting establishment of a session between the calling terminal and the called terminal, and a connection request for transmitting to the called terminal When the connection request transmission unit and the connection request reception unit receive the connection request, the connection request transmission unit transmits the connection request to the destination terminal, and the connection request transmission unit transmits the connection request to the destination terminal. From waiting When the waiting period of the length indicated by the waiting period information stored in the period information storage unit has elapsed, the connection request transmitting unit is caused to function as a connection request transmission control unit that transmits a connection request to the destination terminal again. .

  Further, in an eighth aspect of the present invention, a communication comprising a communication control device that establishes a session between a calling terminal and a called terminal, and a communication relay device that relays communication between the calling terminal and the called terminal. In the system, the destination terminal has a standby mode in which no data is received and a communication mode in which data is received, and after a transition to the standby mode, a standby period preset in the destination terminal elapses. The communication control device transits to the communication mode, and the communication control device stores a standby period information storage unit that stores standby period information indicating a length of a standby period that is set in advance in the called terminal, and a session between the calling terminal and the called terminal. A connection request receiving unit that receives a connection request that requests establishment from a calling terminal, a connection request transmitting unit that transmits a connection request to a called terminal via a communication relay device, and a connection request receiving unit that receives the connection request If a connection request is sent From the time when the connection request transmission unit transmits the connection request to the destination terminal via the communication relay device, the waiting period information storage unit stores the connection request. A connection request transmission control unit that causes the connection request transmission unit to transmit the connection request again to the destination terminal via the communication relay device when the standby period of the length indicated by the waiting period information has elapsed.

  The above summary of the invention does not enumerate all the necessary features of the present invention, and sub-combinations of these feature groups can also be the invention.

  According to the present invention, even when the power saving period of the communication terminal 10 is increased, the reliability of the user of the communication terminal 10 is not impaired, and between the communication relay device 20 and the communication control device 40. By reducing the traffic, the reliability of the communication system 60 can be improved.

  Hereinafter, the present invention will be described through embodiments of the invention. However, the following embodiments do not limit the claimed invention, and all combinations of features described in the embodiments are included. It is not necessarily essential for the solution of the invention.

  FIG. 1 shows an overview of a communication system 60 according to an embodiment of the present invention. The communication system 60 includes a client side network 70, a client side network 72, an IP network 74, a server side network 76, and a voice public network 78. The client-side network 70 includes the communication terminal 10 (a), the communication relay device 20 (a), and the router 30 (a) that connects the client-side network 70 to the IP network 74. Similarly, the client side network 72 includes the communication terminal 10 (b), the communication relay device 20 (b), and the router 30 (b). The server-side network 76 includes a media gateway (MGW) 50 that performs media conversion to connect to the router 30, the communication control device 40, and the voice public network 78.

  The communication terminal 10 is a communication terminal 10 that wirelessly communicates with the communication relay device 20, and is, for example, a mobile phone terminal. The communication terminal 10 may be a PC, a PDA, a game machine, a home appliance, an OA device or the like having a wireless LAN function. The communication relay device 20 is an access point that relays wireless communication between the communication terminal 10 and another communication terminal 10 in, for example, a wireless LAN. Furthermore, the communication control device 40 may be, for example, a SIP server that performs control of call control signals using SIP (Session Initiation Protocol), control of voice calls using VoIP (Voice over Internet Protocol), and the like. .

  The communication system 60 according to the present embodiment does not impair the reliability of the user of the communication terminal 10 even when the power saving period of the communication terminal 10 is increased, and the communication relay device 20 and the communication control device 40. It is an object to improve the reliability of the communication system 60 by reducing the traffic between the communication system 60 and the communication system 60.

  In the following description, the flow of processing by a normal SIP will be described with reference to FIGS. 10 and 11, and then the first embodiment and the second embodiment of the present invention shown in FIG. 1 will be described.

  First, FIG. 10 and FIG. 11 show an example of the flow of processing in call control by normal SIP. First, as shown in FIG. 10, the communication terminal 10 (a) transmits a Register Request message to the communication control device 40 when the communication terminal 10 (a) is powered on (S <b> 1000). The communication control device 40 executes the registration process of the communication terminal 10 (a) according to the received Register Request message, and transmits the 200OK message to the communication terminal 10 (a) when the registration is performed (S1005). ). Similarly, the communication terminal 10 (b) also transmits a Register Request message to the communication control device 40, thereby causing the communication control device 40 to execute a registration process (S1010, S1015).

  Subsequently, when the user of the communication terminal 10 (b) desires to communicate with the user of the communication terminal 10 (a), the communication terminal 10 (b) is operated and the communication control device 40 is operated from the communication terminal 10 (b). An INVITE message requesting establishment of a session with the communication terminal 10 (a) is transmitted (S1020). When the communication control apparatus 40 receives the INVITE message, the communication control apparatus 40 transmits a 100 Trying message indicating that the execution of the process specified by the INVITE message is being executed to the communication terminal 10 (b) (S1025). The communication control device 40 transmits a 100 Trying message to the communication terminal 10 (b) and transfers the INVITE message received from the communication terminal 10 (b) to the communication terminal 10 (a) (S1030).

  In response to the received INVITE message, the communication terminal 10 (a) transmits a 100 Trying message indicating that the process specified by the INVITE message is being attempted to the communication control device 40 (S1035). The communication control device 40 does not transfer the 100 Trying message received from the communication terminal 10 (a) to the communication terminal 10 (b), but receives a 180 Ringing message indicating that the communication terminal 10 (a) is calling. stand by.

  Here, as shown in FIG. 11, in normal call control by SIP, when the communication control device 40 does not receive a 100 Trying message from the communication terminal 10 (a), a time defined by a multiple of a predetermined time. Each time the back-off time elapses, the INVITE message received from the communication terminal 10 (b) is repeatedly retransmitted (S1500 to S1525). If the communication control device 40 does not receive a 100 Trying message from the communication terminal 10 (a) until a predetermined timeout time (for example, 32 seconds) elapses from the transmission of the first INVITE message (S1030), communication is performed. An error message (for example, 408 Request timeout) indicating that a communication session cannot be established between the terminal 10 (a) and the communication terminal 10 (b) is transmitted to the communication terminal 10 (b).

  On the other hand, when the communication terminal 10 (a) receives the INVITE message before the timeout time elapses, the communication terminal 10 (a) transmits a 100 Trying message to the communication control apparatus 40. When the 100Trying message is received from the communication terminal 10 (a), the communication control device 40 transfers the 180Ringing message received from the communication terminal 10 (a) to the communication terminal 10 (b) (S1045). When the user of the communication terminal 10 (a) responds, the communication terminal 10 (a) transmits a 200 OK message to the communication control device 40 (S1050).

  The communication control device 40 transfers the received 200 OK message to the communication terminal 10 (b). Then, the communication terminal 10 (b) transmits an ACK message indicating confirmation that the 200OK message has been received to the communication control device 40, and transitions to a state in which voice communication is possible. The communication control device 40 transmits an ACK message to the communication terminal 10 (a). The communication terminal 10 (a) that has received the ACK message also transitions to a state in which voice communication is possible, and is in a state in which communication is possible between the communication terminal 10 (a) and the communication terminal 10 (b) ( S1070).

  Here, the communication system 60 according to the first embodiment of the present invention includes a communication relay device 20 via the router 30 between the communication terminal 10 (a) and the communication control device 40, as shown in FIG. Is provided. The communication relay device 20 is, for example, an access point in a wireless LAN system. The communication relay device 20 relays communication between the communication terminal 10 (b) that is the calling terminal and the communication terminal 10 (a) that is the called terminal. When the communication relay device 20 (a) receives the INVITE message transmitted from the communication terminal 10 (b) to the communication terminal 10 (a) via the communication control device 40, the communication terminal 10 (a) Before receiving the 100 Trying message to be transmitted to the communication control device 40 via the device 20 from the communication terminal 10 (a), the 100 Trying message is transmitted to the communication control device 40.

  As a result, the communication control apparatus 40 determines in the communication terminal 10 (a) that the process specified by the INVITE message transmitted by the communication terminal 10 (b) is being attempted. Thus, it is no longer necessary to execute the repeat retransmission process of the INVITE message that occurs in the call control process by the normal SIP shown in FIG. Therefore, communication traffic between the communication control device 40 and the communication terminal 10 can be greatly reduced, which contributes to improvement in communication reliability in the entire communication system 60.

  Further, when the communication terminal 10 (a) increases the interval at which the beacon from the communication relay device 20 can be received, the communication terminal 10 (a) receives the INVITE message transmitted by the communication terminal 10 (b). The timing at which this can be done is also increased. In such a case, when call control by normal SIP is executed in the communication control device 40, the INVITE message may have to be retransmitted repeatedly, and in this case, communication traffic increases. However, in the first embodiment of the present invention, as described above, the communication relay device 20 (a) sends the 100Trying message that the communication terminal 10 (a) should transmit to the communication control device 40 to the communication terminal 10 (a ) Is transmitted to the communication control device 40 before reception, communication traffic can be reduced.

  Next, in the communication system 60 according to the second embodiment of the present invention, the communication control device 40 stores standby period information indicating the length of the standby period preset in the communication terminal 10 (a). Here, the communication terminal 10 which is the receiving terminal has a standby mode in which data is not received and a communication mode in which data is received. And the communication terminal 10 which is a callee terminal changes to communication mode, if the standby period preset for the callee terminal passes after changing to standby mode. That is, the standby period indicates a period during which the communication terminal 10 (a) is in the standby mode.

  The communication terminal 10 (a) can receive the INVITE message transmitted from the communication control device 40 from the communication control device 40 in the communication mode, but cannot receive the INVITE message in the standby mode. Therefore, the communication terminal 10 (a) cannot transmit the 100Trying message to the communication control device 40 during the standby mode. In such a case, when the communication control device 40 does not grasp the standby period that is the time during which the standby mode of the communication terminal 10 (a) continues, the communication control device 40 repeats the INVITE message before the standby period elapses. There are times when it keeps resending.

  However, in the second embodiment of the present invention, the communication control device 40 stores the standby period information indicating the standby period of the communication terminal 10 (a) in advance, thereby reducing the standby period of the communication terminal 10 (a). Since it is possible to grasp, after transmitting the INVITE message received from the communication terminal 10 (b) to the communication terminal 10 (a), even if the 100Trying message is not received from the communication terminal 10 (a) until the waiting period elapses Until the period elapses, the INVITE message is not retransmitted repeatedly. Therefore, communication traffic between the communication control device 40 and the communication terminal 10 can be significantly reduced.

  Further, in the second embodiment of the present invention, by storing the standby period of the communication terminal 10 in advance, the communication control device 40 can grasp the standby period in which the communication terminal 10 is in the standby mode. Therefore, even when the communication terminal 10 is designed to save power by setting a long standby period, communication traffic between the communication control device 40 and the communication terminal 10 does not increase. .

  FIG. 2 shows an example of a functional configuration of the communication relay device 20 according to the present embodiment. The communication relay device 20 is a device that relays communication between the communication terminal 10 and the communication control device 40 and / or another communication terminal 10, and is, for example, an access point in a wireless LAN. The calling terminal and the called terminal described in the claims are examples of the communication terminal 10. Further, the communication according to the present embodiment may be packet communication, for example. The communication relay device 20 includes a relay side data transmission / reception unit 200, a transmission request reception unit 205, a relay side connection request transmission unit 210, a relay side connection request reception unit 215, a connection request storage unit 220, a relay side confirmation response transmission unit 225, a relay Side confirmation response receiving section 230, notification information transmitting section 235, relay side reception response receiving section 240, and relay side reception response transmitting section 245.

  The relay-side data transmission / reception unit 200 transmits the data transmitted by the relay-side connection request transmission unit 210, the relay-side confirmation response transmission unit 225, the notification information transmission unit 235, and the relay-side reception response transmission unit 245 to the communication terminal 10 or the communication control. Transmit to device 40. The relay-side data transmission / reception unit 200 receives data received from the communication terminal 10 or the communication control device 40 from the transmission request reception unit 205, the relay-side connection request reception unit 215, the relay-side confirmation response reception unit 230, and the relay-side reception. This is supplied to the response receiving unit 240.

  The relay side connection request reception unit 215 establishes a session with the calling terminal via the communication control device 40 that establishes a session between the calling communication terminal 10 (calling terminal) and the called communication terminal 10 (called terminal). A connection request (for example, an INVITE message) requesting establishment of a session with the called terminal is received from the calling terminal. The relay side connection request receiving unit 215 supplies the received connection request to the connection request storage unit 220. Further, the relay side connection request receiving unit 215 supplies a signal indicating that the connection request has been received to the relay side confirmation response transmitting unit 225 and the notification information transmitting unit 235. The relay side connection request receiving unit 215 is an example of the connection request receiving unit according to claims 1 to 4 and claims 6 and 7.

  The notification information transmission unit 235 transmits notification information (for example, Beacon) including information required for communication between the communication relay device 20 and the communication terminal 10 at a predetermined interval. When the notification information transmission unit 235 receives a signal indicating that the connection request has been received from the relay side connection request reception unit 215, the notification information transmission unit 235 notifies the destination terminal that the connection request for the destination terminal has been received. Send information to the called terminal. Specifically, the notification information transmission unit 235 transmits notification information (for example, Beacon (+ TIM)) in which notification information is added to the notification information.

  The connection request storage unit 220 stores a connection request. Specifically, the connection request storage unit 220 stores the connection request received by the relay side connection request reception unit 215. The connection request storage unit 220 is controlled by the relay side connection request transmission unit 210 to supply the stored connection request to the relay side connection request transmission unit 210. The transmission request receiving unit 205 transmits a transmission request for transmitting a connection request addressed to the destination terminal transmitted by the destination terminal that has received the notification information (for example, the communication relay device from the power-saving destination terminal) PS Poll message indicating an instruction to transmit data) to the receiving terminal. The transmission request reception unit 205 supplies a signal indicating that the transmission request has been received to the relay side connection request transmission unit 210. When the relay side connection request transmission unit 210 receives a signal indicating that the transmission request has been received from the transmission request reception unit 205, the relay side connection request transmission unit 210 transmits the connection request transmitted by the calling side terminal to the called side terminal. Specifically, the relay side connection request transmission unit 210 works on the connection request storage unit 220 to transmit the connection request stored in the connection request storage unit 220 to the destination terminal.

  In response to the transmission request transmitted after the receiving terminal receives the notification information, the relay side confirmation response receiving unit 230 confirms that the connection request transmitted by the relay side connection request transmission unit 210 has been received (for example, 100 Trying message) is received from the called terminal. The relay side confirmation response receiving unit 230 supplies a signal indicating that the confirmation response has been received to the relay side confirmation response transmitting unit 225. The relay side confirmation response receiving unit 230 is an example of the confirmation response receiving unit according to claims 1, 6, and 7.

  After receiving the signal indicating that the connection request has been received from the relay side connection request receiving unit 215, the relay side confirmation response transmitting unit 225 receives the signal indicating that the confirmation response has been received from the relay side confirmation response receiving unit 230. Before that, an acknowledgment is transmitted to the communication control device 40. Also, the relay side confirmation response transmitting unit 225, when the relay side confirmation response receiving unit 230 transmits the confirmation response to the communication control device 40 before the relay side confirmation response receiving unit 230 receives the confirmation response from the destination terminal, the relay side confirmation response receiving unit 230. Does not transmit the confirmation response to the communication control device 40 after receiving the confirmation response from the destination terminal.

  When the communication control device 40 does not receive a confirmation response from the communication relay device 20 in response to a connection request from the calling terminal to the called terminal, the communication control device 40 sends the connection request to the communication relay device at a predetermined time interval. 20 repeatedly transmitted. In such a case, the relay side confirmation response transmission unit 225 sends the confirmation response to the communication control device 40 after the predetermined time interval elapses after the relay side connection request reception unit 215 receives the connection request. Send to. Note that the relay side confirmation response transmission unit 225 may include a memory that acquires a predetermined time interval from the communication control device 40 and stores it in advance. And the relay side connection request | requirement receiving part 215 may read the time interval memorize | stored in the said memory, and may transmit a confirmation response to the communication control apparatus 40, before the period of the said time interval passes.

  Furthermore, when the communication control device 40 does not receive an acknowledgment from the communication relay device 20 in response to the connection request, the communication control device 40 repeatedly transmits the connection request to the communication relay device 20. In such a case, the relay side confirmation response transmission unit 225 transmits the confirmation response to the communication control device 40 before the relay side confirmation response reception unit 230 receives the confirmation response from the destination terminal, thereby the communication control device 40. Does not send connection requests repeatedly. For example, the relay side confirmation response receiving unit 230 transmits a confirmation response to the communication control device 40, thereby suppressing the communication control device 40 from transmitting a connection request and reducing communication traffic. The relay side confirmation response transmission unit 225 is an example of the confirmation response transmission unit according to claims 1 to 4, and 6 and 7.

  The relay side reception response receiving unit 240 receives a reception response (for example, a 180 Ringing message) indicating that a call is being made from the destination terminal. The relay side reception response receiving unit 240 supplies the received reception response to the relay side reception response transmitting unit 245. The relay side reception response transmission unit 245 transmits the reception response transmitted by the destination terminal to the communication control device 40.

  According to the communication relay device 20 according to the present embodiment, the confirmation response can be transmitted to the communication control device 40 before the confirmation response is received from the destination terminal. As a result, it is possible to prevent the connection request from being repeatedly retransmitted due to the fact that the communication control device 40 does not receive an acknowledgment from the called terminal, so that communication traffic between the communication control device 40 and the communication relay device 20 can be prevented. Can be greatly reduced.

  FIG. 3 shows an example of the functional configuration of the communication control device 40 according to the present embodiment. The communication control device 40 is a communication control device 40 that establishes a session between a calling terminal and a called terminal, and is, for example, a SIP server. The communication control device 40 includes a control side data transmission / reception unit 400, a control side connection request reception unit 405, a control side connection request transmission unit 410, a connection request transmission control unit 415, a standby period information storage unit 420, a standby period information reception unit 425, A location registration information receiving unit 430, a location registration unit 435, a control side confirmation response receiving unit 440, a control side confirmation response transmitting unit 445, a control side reception response receiving unit 450, and a control side reception response transmitting unit 455 are provided.

  The control-side data transmission / reception unit 400 transmits the data transmitted by the control-side data transmission / reception unit 400, the control-side connection request transmission unit 410, the control-side confirmation response transmission unit 445, and the control-side reception response transmission unit 455 to the communication terminal 10 or the communication Transmit to the relay device 20. In addition, the control-side data transmission / reception unit 400 receives data received from the communication terminal 10 or the communication relay device 20 from the control-side data transmission / reception unit 400, the control-side connection request reception unit 405, the standby period information reception unit 425, and the location registration information reception. Unit 430, control side confirmation response reception unit 440, and control side reception response reception unit 450.

  The location registration information receiving unit 430 receives location registration information (for example, a Register message) transmitted from the destination terminal or the originating terminal to register the location with the communication control device 40. The location registration information receiving unit 430 supplies the received location registration information to the location registration unit 435. In addition, the destination terminal or the calling terminal may further transmit location registration information with standby period information indicating the length of the standby period preset in the destination terminal. In such a case, the location registration information receiving unit 430 supplies the waiting period information receiving unit 425 with the waiting period information transmitted by the destination terminal or the calling terminal added to the location registration information.

  The waiting period information receiving unit 425 receives waiting period information transmitted from the destination terminal or the calling terminal. The standby period information receiving unit 425 may receive the location registration information accompanied with the standby period information. The waiting period information receiving unit 425 may receive the waiting period information added to the position registration information received by the position registration information receiving unit 430 from the position registration information receiving unit 430. The waiting period information receiving unit 425 may receive waiting period information transmitted separately from the transmission of the location registration information by the destination terminal or the calling terminal. The standby period information receiving unit 425 supplies the standby period information to the standby period information storage unit 420.

  The standby period information storage unit 420 stores standby period information indicating the length of the standby period set in advance in the destination terminal or the calling terminal. The standby period information storage unit 420 stores the standby period information received from the standby period information receiving unit 425. Further, the standby period information storage unit 420 may store standby period information attached to the location registration information received by the standby period information receiving unit 425. The standby period information storage unit 420 is controlled by the connection request transmission control unit 415 and supplies standby period information to the connection request transmission control unit 415.

  The location registration unit 435 receives from the location registration information receiving unit 430 location registration information that requests registration of the location where the called terminal or the calling terminal exists. Then, the location registration unit 435 transmits a success response (for example, a 200 OK message) indicating that the location registration information has been received to the callee terminal or the callee terminal. Then, for example, the location registration unit 435 registers the destination terminal or the source terminal in a location server that controls registration / update / deletion of terminal identification information for identifying the destination terminal or the source terminal. Note that the communication control device 40 does not include the location registration unit 435 but may include the location registration unit 435 outside the communication control device 40.

  The control side connection request receiving unit 405 receives a connection request for requesting establishment of a session between the calling side terminal and the called side terminal from the calling side terminal. The control side connection request receiving unit 405 supplies the received connection request to the control side connection request transmitting unit 410. Further, the control side connection request receiving unit 405 supplies a signal indicating that the connection request has been received to the control side confirmation response transmitting unit 445. The control-side connection request receiving unit 405 is an example of the connection request receiving unit according to claims 8, 12, and 13. The control side connection request transmission unit 410 transmits a connection request to the destination terminal. The control side connection request transmission unit 410 is controlled by the connection request transmission control unit 415 to transmit the connection request received from the control side connection request reception unit 405 to the destination terminal. The control side connection request transmission unit 410 is an example of a connection request transmission unit according to claims 8, 12 and 13.

  When the control side connection request receiving unit 405 receives the connection request, the connection request transmission control unit 415 transmits the connection request to the control side connection request transmission unit 410 to the destination terminal. Then, the connection request transmission control unit 415 waits for the length indicated by the standby period information stored in the standby period information storage unit 420 from when the control side connection request transmission unit 410 transmits the connection request to the destination terminal. When the period elapses, the control side connection request transmission unit 410 transmits the connection request to the destination terminal again.

  The control side confirmation response receiving unit 440 receives the confirmation response transmitted by the destination terminal. The control side confirmation response receiving unit 440 supplies a signal indicating that the confirmation response has been received from the destination terminal to the control side confirmation response transmission unit 445. The control side confirmation response transmission unit 445 transmits the confirmation response to the calling side terminal. Specifically, when the control side connection request receiving unit 405 receives a signal indicating that the connection request has been received from the calling side terminal, the control side confirmation response transmitting unit 445 sends a confirmation response to the calling side terminal. Send. The control side reception response receiving unit 450 receives a reception response indicating that a call is being made from the destination terminal. The control side reception response reception unit 450 supplies the reception response received from the destination terminal to the control side reception response transmission unit 455. The control-side reception response transmission unit 455 transfers the reception response received from the control-side reception response reception unit 450 to the originating terminal.

  Note that, when receiving a confirmation response from the control-side confirmation response transmission unit 445, the calling-side terminal outputs a proxy response sound indicating that session establishment with the called-side terminal is being executed. When the receiving side terminal receives the reception response from the control side reception response transmitting unit 455, the calling side terminal stops the proxy response sound that has been output and indicates that the destination side terminal is calling for participation in the session. Output ringing tone.

  According to the communication control device 40 according to the present embodiment, the waiting period information of the communication terminal 10 on the arrival side (the arrival side terminal) can be stored in advance. Thus, the communication control device 40 does not repeatedly transmit the connection request received from the calling communication terminal 10 (calling terminal) to the call receiving terminal until the waiting period indicated by the waiting period information elapses. And the communication traffic between the communication control device 40 can be reduced.

  Further, since the communication control device 40 according to the present embodiment can store the standby period information of the communication terminal 10 in advance, for example, the standby period is set to be long in order to suppress power consumption of the destination terminal. Even in this case, the communication control device 40 does not repeatedly transmit a connection request to the called terminal during the standby period. Therefore, even when power consumption is significantly suppressed at the called terminal, an increase in communication traffic can be suppressed.

  FIG. 4 shows an example of a functional configuration of the communication terminal 10 according to the present embodiment. The communication terminal 10 is a mobile phone terminal having a wireless LAN function, for example. The calling terminal and the called terminal described in the claims are examples of the communication terminal 10. The communication terminal 10 includes a terminal-side data transmission / reception unit 100, a mode control unit 102, a terminal-side connection request transmission unit 105, a request input unit 107, a terminal-side confirmation response reception unit 110, an output control unit 115, an output unit 120, and a terminal-side reception. Response reception unit 125, location registration information transmission unit 130, standby period information storage unit 135, notification information reception unit 140, transmission request transmission unit 145, terminal side connection request reception unit 150, terminal side confirmation response transmission unit 155, terminal side reception A response transmission unit 160, a voice input unit 165, a voice data transmission / reception unit 170, and a voice data conversion unit 175 are provided.

  The terminal side data transmission / reception unit 100 includes a terminal side data transmission / reception unit 100, a terminal side connection request transmission unit 105, a location registration information transmission unit 130, a transmission request transmission unit 145, a terminal side confirmation response transmission unit 155, and a terminal side reception response transmission unit. 160 and the data transmitted by the voice data transmitting / receiving unit 170 are transmitted to the communication relay device 20 or the communication control device 40. In addition, the terminal-side data transmission / reception unit 100 receives data received from the communication relay device 20 or the communication control device 40, the terminal-side data transmission / reception unit 100, the terminal-side confirmation response reception unit 110, the terminal-side reception response reception unit 125, notification information The data is supplied to the receiving unit 140, the terminal side connection request receiving unit 150, and the voice data transmitting / receiving unit 170.

  The standby period information storage unit 135 stores standby period information indicating the length of the standby period in the standby mode preset for the communication terminal 10. The standby period indicated by the standby period information may be set when the communication terminal 10 is manufactured, or may be set afterwards by the user of the communication terminal 10. The standby period information storage unit 135 supplies the stored standby period information to the location registration information transmission unit 130 and the mode control unit 102. The location registration information transmission unit 130 transmits location registration information in order to register the communication terminal 10 in the communication control device 40. The location registration information transmitting unit 130 transmits location registration information accompanied by the standby period information stored in the standby period information storage unit 135.

  The request input unit 107 causes the user of the communication terminal 10 to input a connection request that is a request for establishing a session with the communication terminal 10 on the originating side. The request input unit 107 supplies the connection request input by the user to the terminal-side connection request transmission unit 105. The terminal-side connection request transmission unit 105 transmits the connection request received from the request input unit 107 to the communication control device 40. The notification information receiving unit 140 receives notification information transmitted by the communication relay device 20 at a predetermined cycle. Further, the notification information receiving unit 140 has received notification information from the communication relay device 20 indicating that the communication relay device 20 or the communication control device 40 has received a connection request for the communication terminal 10 that is the communication terminal 10 on the called side. In this case, a signal indicating that the notification information has been received is supplied to the mode control unit 102 and the transmission request transmission unit 145.

  When the transmission request transmission unit 145 receives a signal indicating that notification information has been received from the notification information reception unit 140, the transmission request transmission unit 145 sends a transmission request for requesting the communication relay device 20 or the communication control device 40 to transmit a connection request. Send. The terminal side connection request receiving unit 150 receives the connection request transmitted by the communication relay device 20 or the communication control device 40 in response to the transmission request transmitted by the transmission request transmitting unit 145. The terminal-side connection request reception unit 150 supplies a signal indicating that the connection request has been received to the terminal-side confirmation response transmission unit 155 and the terminal-side reception response transmission unit 160.

  The terminal side confirmation response receiving unit 110 receives the confirmation response transmitted by the communication control device 40 in response to the connection request transmitted by the terminal side connection request transmission unit 105. The terminal-side confirmation response receiving unit 110 supplies a signal indicating that the confirmation response has been received to the output control unit 115. The terminal-side reception response receiving unit 125 receives the reception response transmitted from the communication terminal 10 on the called side via the communication relay device 20 and the communication control device 40. The terminal-side reception response reception unit 125 supplies a signal indicating that the reception response has been received to the output control unit 115.

  The output unit 120 outputs data that can be perceived by the user of the communication terminal 10 such as audio data, image data, and text data. Specifically, the output unit 120 vibrates a sound output unit that outputs sound and / or sound, a display unit that outputs image data and / or text data indicating a still image or a moving image, and the communication terminal 10. It may have a vibration part which shows having received data. For example, the sound output unit outputs the sound data received from the sound data conversion unit 175. The vibration unit vibrates according to the sound data when the sound data received from the sound data conversion unit 175 cannot be output from the sound output unit (for example, when the user sets the sound output unit in the mute mode). The communication terminal 10 is vibrated with a pattern.

  The output control unit 115 controls the output unit 120 to output data that can be perceived by the user of the communication terminal 10 such as voice data, image data, and text data. Specifically, when the output control unit 115 receives a signal indicating that the confirmation response has been received from the terminal-side confirmation response receiving unit 110, the output control unit 115 causes the output unit 120 to perform session establishment with the communication terminal 10 on the destination side. The proxy response information indicating that it is in the middle is output. The proxy response information is, for example, a proxy response sound that is preset voice data, a proxy response text that is preset text data, and / or a proxy response image that is preset image data.

  When the output control unit 115 receives a signal indicating that a reception response has been received from the terminal-side reception response reception unit 125, the output control unit 115 stops the output of the proxy response information from the output unit 120. Subsequently, the output control unit 115 causes the output unit 120 to output call information that is calling the user of the communication terminal 10 on the called side. The call information is, for example, a call sound that is preset voice data, a call text that is preset text data, and / or a call image that is preset image data. The proxy response sound and the ringing sound may be music data set in advance. Further, the proxy response information and the call information may be different types of information that can be recognized by the user of the communication terminal 10.

  For example, when the proxy response information is a proxy response sound and the call information is a call sound, the proxy response sound and the call sound may be different audio data. When the output control unit 115 receives a signal indicating that the confirmation response has been received from the terminal-side confirmation response receiving unit 110, the output control unit 115 causes the output unit 120 to output a proxy response sound, and then the terminal-side reception response reception unit 125. When receiving a signal indicating that the reception response has been received from, the output of the proxy response sound from the output unit 120 is stopped and a ringing tone that is voice data different from the proxy response sound is output.

  When the proxy response information is proxy response text and the call information is call text, the proxy response text and the call text may be different text data. When the output control unit 115 receives a signal indicating that the confirmation response has been received from the terminal-side confirmation response receiving unit 110, the output control unit 115 causes the output unit 120 to output the proxy response text, and then the terminal-side reception response reception unit 125. When receiving a signal indicating that the reception response has been received from, the output of the proxy response text is stopped from the output unit 120 and the calling text that is text data different from the proxy response text is output.

  When the proxy response information is a proxy response image and the call information is a call image, the proxy response image and the call image may be different image data. When the output control unit 115 receives a signal indicating that the confirmation response has been received from the terminal-side confirmation response receiving unit 110, the output control unit 115 causes the output unit 120 to output a proxy response image, and then the terminal-side reception response reception unit 125. When receiving a signal indicating that a reception response has been received from, the output of the proxy response image from the output unit 120 is stopped and a call image that is image data different from the proxy response image is output.

  The communication terminal 10 may further include a signal generation unit and a signal storage unit. The signal generation unit generates proxy response information and / or call information. The signal storage unit stores proxy response information and / or call information generated by the signal generation unit. When the output control unit 115 receives a signal indicating that the confirmation response has been received from the terminal-side confirmation response receiving unit 110, the output control unit 115 may output the proxy response information stored in the signal storage unit from the output unit 120. Further, when the output control unit 115 receives a signal indicating that a reception response has been received from the terminal-side reception response reception unit 125, the output control unit 115 may cause the output unit 120 to output the call information stored in the signal storage unit. Good. Thereby, the user of the communication terminal 10 can freely generate proxy response information and call information.

  When receiving a signal indicating that the connection request has been received from the terminal-side connection request receiving unit 150, the terminal-side confirmation response transmitting unit 155 indicates that the terminal-side confirmation response transmitting unit 155 is attempting to execute a process according to the connection request. Is transmitted to the communication relay device 20 or the communication control device 40. After receiving the signal indicating that the connection request has been received from the terminal-side connection request receiving unit 150, the terminal-side reception response transmitting unit 160 executes processing according to the connection request and calls the user of the communication terminal 10 A reception response indicating that the communication is in progress is transmitted to the originating communication terminal 10 via the communication relay device 20 or the communication control device 40.

  The voice input unit 165 inputs voice. The voice input unit 165 supplies the voice data of the input voice to the voice data conversion unit 175. The voice data transmitting / receiving unit 170 receives a plurality of voice packets from other communication terminals 10. In addition, the voice data transmission / reception unit 170 transmits the plurality of voice packets received from the voice data conversion unit 175 to another communication terminal 10. The voice data conversion unit 175 converts the voice data received from the voice input unit 165 into a plurality of voice packets. The voice data conversion unit 175 supplies a plurality of voice packets converted from the voice data to the voice data transmission / reception unit 170. The voice data conversion unit 175 converts the plurality of voice packets received from the voice data transmission / reception unit 170 into voice data. Then, the audio data conversion unit 175 supplies the converted audio data to the output unit 120.

  The mode control unit 102 controls the mode of the communication terminal 10 by controlling the terminal-side data transmission / reception unit 100 to either the standby mode in which data is not received or the communication mode in which data is received. Specifically, the mode control unit 102 controls the mode of the communication terminal 10 to either the communication mode or the standby mode for each standby period indicated by the standby period information stored in the standby period information storage unit 135. . For example, the mode control unit 102 changes the communication terminal 10 from when the communication terminal 10 transitions from the communication mode to the standby mode until the standby period indicated by the standby period information stored in the standby period information storage unit 135 elapses. Control to standby mode.

  Here, the waiting period can be set arbitrarily. Therefore, by setting the standby period to be longer than a predetermined cycle in which the notification information transmission unit 235 of the communication relay device 20 transmits the notification information, the processing in the communication terminal 10 is reduced, and the power consumption of the communication terminal 10 is reduced. Can be realized.

  Further, when the mode control unit 102 receives the signal indicating that the notification information is received from the notification information receiving unit 140 and controls the mode of the communication terminal 10 to the standby mode, the standby period has elapsed. After the communication terminal 10 transitions from the standby mode to the communication mode, the mode of the communication terminal 10 is changed from the communication mode to the standby mode when data transmission / reception does not occur for a predetermined period from when data transmission / reception is executed. Transition to again. Thereby, since the terminal side data transmission / reception part 100 transmits / receives data, since the period which supplies electric power with respect to the terminal side data transmission / reception part 100 can be shortened, the power consumption of the communication terminal 10 is suppressed. Can do.

  According to the communication terminal 10 according to the present embodiment, a proxy response sound can be output when the confirmation response is received from the communication control device 40. And the communication terminal 10 can output a ringing tone triggered by receiving a reception response from the communication control device 40. As a result, the communication terminal 10 on the called side sets the standby mode longer for power saving, and it takes longer time to establish a session between the communication terminal 10 on the calling side and the communication terminal 10 on the called side. However, the reliability for the user of the communication terminal 10 can be improved.

  FIG. 5 shows an example of the flow of processing between the communication terminal 10 and the communication relay device 20 according to the present embodiment. Specifically, an example of the flow of processing when the communication terminal 10 connects to the communication relay device 20 using the active scan method is shown. First, the communication terminal 10 transmits a probe request (Probe Request) for inquiring about the presence or absence of a radio cell existing in the vicinity of the communication terminal 10 to the communication relay device 20 using broadcast on a predetermined channel (S100). . When receiving the probe request, the communication relay device 20 transmits a probe response (Probe Response) to the communication terminal 10 (S105). The probe response includes information indicating a beacon period indicating an interval at which the communication relay device 20 transmits broadcast information (for example, beacon).

  Subsequently, the communication terminal 10 transmits an authentication request (Authentication Request) for requesting execution of authentication between the communication relay devices 20 to the communication relay device 20 (S110). When receiving the authentication request from the communication terminal 10, the communication relay device 20 executes authentication of the communication terminal 10. Then, after performing authentication of the communication terminal 10, the communication relay device 20 transmits an authentication response (Authentication Response) indicating that the communication terminal 10 has been authenticated to the communication terminal 10.

  Then, the communication terminal 10 transmits an association request (association request) that the communication terminal 10 requests communication connection to the communication relay device 20 to the communication relay device 20 (S120). In the association request, whether or not the data addressed to the communication terminal 10 is stored in the communication relay device 20 after the elapse of a predetermined period from when the communication terminal 10 transitions to the power saving state. Information for setting an interval (Listen Interval) to be confirmed by referring to the broadcast information may be included. When the communication relay device 20 receives the association request, the communication relay device 20 transmits an association response (association response) indicating whether or not the communication connection is permitted to the communication terminal 10 (S125).

  FIG. 6 shows an example of the flow of processing in the communication terminal 10 according to the present embodiment. Specifically, an example of the flow of processing when the power saving function is executed in the communication terminal 10 is shown. First, the communication terminal 10 transmits a frame including a power saving bit to the communication relay device 20 (S200). Thereby, the communication relay apparatus 20 can grasp | ascertain that the communication terminal 10 transfers to a power saving mode. On the other hand, the notification information transmission unit 235 of the communication relay device 20 transmits a beacon at a predetermined beacon period (S205).

  In such a case, during the Listen Interval, the mode control unit 102 controls the terminal-side data transmission / reception unit 100 to shift the communication terminal 10 to the power saving mode. That is, the communication terminal 10 is in the Sleep state during the Listen Interval, and the terminal-side data transmitting / receiving unit 100 does not receive the beacon transmitted by the communication relay device 20 (S202). Subsequently, after a predetermined standby period has elapsed, the mode control unit 102 controls the terminal-side data transmission / reception unit 100 to shift the communication terminal 10 to the communication mode, and sets the communication terminal 10 to the Active state. (S212).

  When the mode control unit 102 changes the communication terminal 10 to the communication mode, if the notification information transmitted by the notification information transmission unit 235 does not include the notification information, the mode control unit 102 is determined in advance. After the elapse of time, the communication terminal 10 is again switched to the standby mode, and the communication terminal 10 enters the sleep state (S214). When the communication terminal 10 is in the sleep state and the communication relay device 20 receives data addressed to the communication terminal 10, the communication relay device 20 stores the data (S215). And the notification information transmission part 235 of the communication relay apparatus 20 includes the bit which shows that there exists data addressed to the communication terminal 10, ie, notification information, in notification information, and transmits notification information (S220).

  After the elapse of the standby period, the mode control unit 102 of the communication terminal 10 changes the communication terminal 10 from the standby mode to the communication mode, and changes from the sleep state (S214) to the active state (S216). And the notification information receiving part 140 receives the alerting | reporting information in which notification information is contained. The notification information receiving unit 140 supplies a signal indicating that the notification information is included in the broadcast information to the transmission request transmitting unit 145. When the transmission request transmission unit 145 receives a signal indicating that the notification information is included in the broadcast information, the transmission request transmission unit 145 requests transmission of data addressed to the communication terminal 10 stored in the communication relay device 20. (For example, PS Poll) is transmitted to the communication relay device 20 (S230). When receiving the transmission request from the communication terminal 10, the communication relay device 20 transmits the stored data addressed to the communication terminal 10 to the communication terminal 10.

  FIG. 7 shows an example of a processing flow in the communication relay device 20 according to the first embodiment. Specifically, an example of the flow of call control processing when the communication relay device 20 executes a proxy response is shown. First, the terminal-side connection request transmission unit 105 of the communication terminal 10 (b) transmits a connection request (Request: INVITE sip) requesting establishment of a session with the communication terminal 10 (a) to the communication control device 40 (S300). ). The control side connection request receiving unit 405 of the communication control device 40 receives a connection request from the communication terminal 10 (b).

  Subsequently, the control-side confirmation response transmission unit 445 transmits a confirmation response (Status: 100 Trying) indicating that the execution of the process specified in the connection request is being attempted to the communication terminal 10 (b) (S302). . The terminal-side confirmation response receiving unit 110 of the communication terminal 10 (b) receives the confirmation response from the communication control device 40 and supplies a signal indicating that the confirmation response has been received to the output control unit 115. Then, the output control unit 115 controls the output unit 120 to cause the output unit 120 to output a proxy response sound that can be perceived by the user of the communication terminal 10 (b) (S350). On the other hand, the control-side connection request transmitting unit 410 of the communication control device 40 connects the connection request received by the control-side connection request receiving unit 405 from the communication terminal 10 (b) so that the communication terminal 10 (a) can communicate. To the existing communication relay device 20 (S304).

  The communication relay device 20 sends notification information (Beacon) at a predetermined cycle (S308). When receiving the connection request from the communication control device 40, the relay side connection request receiving unit 215 of the communication relay device 20 supplies a signal indicating that the connection request has been received to the relay side confirmation response transmitting unit 225. Then, before the relay side confirmation response receiving unit 230 receives the confirmation response (100 Trying) from the communication terminal 10 (a), the relay side confirmation response transmitting unit 225 sends the confirmation response (Status: 100 Trying) to the communication control device 40. (S306).

  As a result, the communication control device 40 does not repeatedly retransmit the connection request received from the communication terminal 10 (b) to the communication relay device 20, so that communication traffic between the communication relay device 20 and the communication control device 40 is reduced. Can be reduced.

  Further, the notification information transmitting unit 235 receives a signal indicating that the connection request has been received from the relay side connection request receiving unit 215, and adds notification information indicating that the connection request for the communication terminal 10 (a) is received. The broadcast information (Beacon (+ TIM)) is sent (S310). The notification information receiving unit 140 of the communication terminal 10 (a) receives the notification information when the power saving period has elapsed. Then, the transmission request transmission unit 145 requests the communication relay apparatus 20 to transmit a connection request according to the notification information attached to the broadcast information (PS Poll, S312). The communication relay device 20 requested to transmit the connection request from the communication terminal 10 (a) transmits a connection request (Data (INVITE)) from the relay side connection request transmission unit 210 to the communication terminal 10 (a) (S314). .

  The communication terminal 10 (a) receives the connection request from the communication relay device 20, and sends a confirmation response (Status: 100 Trying) indicating that processing is being attempted in response to the connection request to the terminal side confirmation response transmission unit. Transmit from 155 (S316). Then, when the user of the communication terminal 10 (a) responds to the connection request, the terminal-side reception response transmission unit 160 transmits a reception response (Status: 180 Ringing) indicating that the call is being made to the communication relay device 20. (S318). Note that the communication relay device 20 does not transfer the confirmation response to the communication control device 40 even when the confirmation response is received from the communication terminal 10 (a).

  The relay side reception response transmitting unit 245 transfers the reception response received by the relay side reception response receiving unit 240 from the communication terminal 10 (a) to the communication control device 40 (S320). The control-side reception response transmission unit 455 of the communication control device 40 transfers the received reception response to the communication terminal 10 (b) (S322). When receiving the reception response, the terminal-side reception response receiving unit 125 of the communication terminal 10 (b) supplies a signal indicating that the reception response has been received to the output control unit 115. Then, the output control unit 115 stops the proxy response sound output from the output unit 120 and causes the output unit 120 to output a ringing sound indicating that the user of the communication terminal 10 (a) is being called (S360). ). On the other hand, after receiving a connection request from the communication relay device 20 (S314), the communication terminal 10 (a) transmits a reception response to the communication relay device 20 (S316), and is perceived by the user of the communication terminal 10 (a). Output possible ringtones.

  When the user of the communication terminal 10 (a) responds to the call, the communication terminal 10 (a) transmits a 200 OK message (Status: 200 OK, wit) to the communication terminal 10 (b) (S324, S326, S328). When receiving the 200 OK message, the communication terminal 10 (b) transmits information (Request: ACK sip: 19) indicating that the 200 OK message has been received to the communication terminal 10 (a) (S330, S332, S334). ). And it will be in the state which can talk between the communication terminal 10 (a) and the communication terminal 10 (b) which received the information which shows having received the 200 OK message (S370).

  FIG. 8 shows an example of the flow of processing in the communication control apparatus 40 according to the second embodiment. Specifically, an example of a processing flow in which the communication terminal 10 transmits the Register message with the waiting period information attached thereto and the communication control apparatus 40 registers the waiting period information is shown. First, the location registration information transmission unit 130 of the communication terminal 10 (a) receives the registration information (Request) when the communication terminal 10 (a) is powered on or when the communication terminal 10 (a) is activated. : REGISTER) is transmitted to the communication control device 40 (S400, S402). In such a case, the location registration information transmission unit 130 transmits the standby period information stored in the standby period information storage unit 135 along with the registration information.

  The location registration information receiving unit 430 of the communication control device 40 receives the registration information transmitted from the communication terminal 10 (a). In such a case, the location registration information receiving unit 430 supplies the standby period information attached to the registration information to the standby period information receiving unit 425. Then, the standby period information receiving unit 425 stores the standby period information in the standby period information storage unit 420. Subsequently, the location registration unit 435 of the communication control device 40 executes a registration process. When the registration process is normally completed, the location registration unit 435 transmits a 200 OK message (Status: 200 OK) to the communication terminal 10 (a) (S404, S406). Thereby, the communication control apparatus 40 can grasp | ascertain the standby | waiting period of the communication terminal 10 (a) previously. The communication terminal 10 (b) also registers its location in the communication control device 40 in the same manner as the communication terminal 10 (a) (S408, S410).

  FIG. 9 shows an example of processing in the communication control apparatus 40 according to the second embodiment. Specifically, an example in the case where the communication control device 40 deals with a process in which the connection request is not repeatedly retransmitted in the standby period indicated by the standby period information is shown. First, the terminal side connection request transmission unit 105 of the communication terminal 10 (b) transmits a connection request (Request: INVITE sip) requesting establishment of a session with the communication terminal 10 (a) to the communication control device 40 (S420). ). The control side connection request receiving unit 405 of the communication control device 40 receives a connection request from the communication terminal 10 (b).

  Subsequently, the control-side confirmation response transmission unit 445 transmits a confirmation response (Status: 100 Trying) indicating that the execution of the process specified in the connection request is being attempted to the communication terminal 10 (b) (S422). . The terminal-side confirmation response receiving unit 110 of the communication terminal 10 (b) receives the confirmation response from the communication control device 40 and supplies a signal indicating that the confirmation response has been received to the output control unit 115. Then, the output control unit 115 controls the output unit 120 to cause the output unit 120 to output a proxy response sound that can be perceived by the user of the communication terminal 10 (b) (S460). On the other hand, the control-side connection request transmitting unit 410 of the communication control device 40 connects the connection request received by the control-side connection request receiving unit 405 from the communication terminal 10 (b) so that the communication terminal 10 (a) can communicate. Is transferred to the existing communication relay device 20 (S424).

  Here, the communication control device 40 manages the standby period information of the communication terminal 10 (a) in advance as described above with reference to FIG. Therefore, the control side connection request transmission unit 410 of the communication control device 40 does not wait until the standby period indicated by the standby period information elapses after the connection request is transferred to the communication terminal 10 (a). Even if the confirmation response (100 Trying message) is not received from the server, the connection request is not retransmitted.

  Thereby, the communication traffic between the communication control apparatus 40 and the communication terminal 10 (a) can be reduced. In addition, a proxy response sound is output in the communication terminal 10 (b), and the timing of retransmission of the connection request can be set according to the standby period indicated by the standby period information preset in the communication terminal 10 (a). Therefore, the immediate response of communication can be complemented while saving power of the communication terminal 10 (a).

  The communication relay device 20 sends notification information (Beacon) at a predetermined cycle (S412). The notification information transmitting unit 235 receives a signal indicating that the connection request has been received from the relay side connection request receiving unit 215, and is accompanied by notification information indicating that the connection request for the communication terminal 10 (a) has been received. Information (Beacon (+ TIM)) is transmitted (S426). The notification information receiving unit 140 of the communication terminal 10 (a) receives the notification information when the power saving period has elapsed. Then, the transmission request transmission unit 145 requests the communication relay device 20 to transmit a connection request in accordance with the notification information attached to the broadcast information (PS Poll, S428). The communication relay device 20 requested to transmit a connection request from the communication terminal 10 (a) transmits a connection request (Request: INVITE sip) to the communication terminal 10 (a) from the relay side connection request transmission unit 210 (S439). .

  The communication terminal 10 (a) receives the connection request from the communication relay device 20, and sends a confirmation response (Status: 100 Trying) indicating that processing is being attempted in response to the connection request to the terminal side confirmation response transmission unit. The data is transmitted from 155 to the communication terminal 10 (b) (S432, S436). Then, when the user of the communication terminal 10 (a) responds to the connection request, the terminal-side reception response transmission unit 160 sends a reception response (Status: 180 Ringing) indicating that the communication is being performed to the communication terminal 10 (b). (S434, S438, S440).

  When receiving the reception response, the terminal-side reception response receiving unit 125 of the communication terminal 10 (b) supplies a signal indicating that the reception response has been received to the output control unit 115. Then, the output control unit 115 stops the proxy response sound output from the output unit 120 and causes the output unit 120 to output a ringing sound indicating that the user of the communication terminal 10 (a) is being called (S470). ). On the other hand, after receiving a connection request from the communication relay device 20 (S430), the communication terminal 10 (a) transmits a reception response to the communication relay device 20 (S434), and is perceived by the user of the communication terminal 10 (a). Output possible ringtones.

  When the user of the communication terminal 10 (a) responds to the call, the communication terminal 10 (a) transmits a 200 OK message (Status: 200 OK, wit) to the communication terminal 10 (b) (S442, S444, S446). When receiving the 200 OK message, the communication terminal 10 (b) transmits information (Request: ACK sip: 19) indicating that the 200 OK message has been received to the communication terminal 10 (a) (S448, S450, S452). ). And it will be in the state which can talk between the communication terminal 10 (a) and the communication terminal 10 (b) which received the information which shows having received the 200 OK message (S480).

  FIG. 12 shows an example of a hardware configuration of the communication terminal 10, the communication relay device 20, and the communication control device 40 according to the present embodiment. The communication terminal 10, the communication relay device 20, and the communication control device 40 according to the present embodiment include a CPU peripheral unit including a CPU 1505, a RAM 1520, a graphic controller 1575, and a display device 1580 that are connected to each other by a host controller 1582. , An input / output unit having a communication interface 1530, a hard disk drive 1540, and a CD-ROM drive 1560 connected to the host controller 1582 by the input / output controller 1584; a ROM 1510 connected to the input / output controller 1584; and a flexible disk drive 1550 And a legacy input / output unit having an input / output chip 1570. Instead of the hard disk drive 1540, CD-ROM 1560, and flexible disk drive 1550, for example, a semiconductor memory drive may be provided.

  The host controller 1582 connects the RAM 1520 to the CPU 1505 and the graphic controller 1575 that access the RAM 1520 at a high transfer rate. The CPU 1505 operates based on programs stored in the ROM 1510 and the RAM 1520 to control each unit. The graphic controller 1575 acquires image data generated by the CPU 1505 or the like on a frame buffer provided in the RAM 1520 and displays the image data on the display device 1580. Alternatively, the graphic controller 1575 may include a frame buffer that stores image data generated by the CPU 1505 or the like.

  The input / output controller 1584 connects the host controller 1582 to the communication interface 1530, the hard disk drive 1540, and the CD-ROM drive 1560, which are relatively high-speed input / output devices. The communication interface 1530 communicates with other devices via a network. The hard disk drive 1540 stores programs and data used by the CPU 1505 in the communication terminal 10, the communication relay device 20, and the communication control device 40. The CD-ROM drive 1560 reads a program or data from the CD-ROM 1595 and provides it to the hard disk drive 1540 via the RAM 1520.

  The input / output controller 1584 is connected to the ROM 1510, the flexible disk drive 1550, and the relatively low-speed input / output device of the input / output chip 1570. The ROM 1510 stores a boot program that the communication terminal 10, the communication relay device 20, and the communication control device 40 execute at startup, a program that depends on the hardware of the communication terminal 10, the communication relay device 20, and the communication control device 40, and the like. To do. The flexible disk drive 1550 reads a program or data from the flexible disk 1590 and provides it to the hard disk drive 1540 via the RAM 1520. The input / output chip 1570 connects various input / output devices via a flexible disk drive 1550 such as a parallel port, a serial port, a keyboard port, and a mouse port.

  A communication program provided to the hard disk drive 1540 via the RAM 1520 is stored in a recording medium such as the flexible disk 1590, the CD-ROM 1595, or an IC card and provided by the user. The communication program is read from the recording medium, installed in the communication terminal 10, the communication relay device 20, and the hard disk drive 1540 in the communication control device 40 via the RAM 1520 and executed by the CPU 1505.

  The communication program installed and executed in the communication relay device 20 works on the CPU 1505 or the like to make the communication relay device 20 the relay-side data transmission / reception unit 200, the transmission request reception unit 205, the relay-side described with reference to FIGS. Connection request transmission unit 210, relay side connection request reception unit 215, connection request storage unit 220, relay side confirmation response transmission unit 225, relay side confirmation response reception unit 230, notification information transmission unit 235, relay side reception response reception unit 240, The relay side reception response transmission unit 245 is caused to function.

  The communication program installed and executed in the communication control device 40 works on the CPU 1505 or the like to make the communication control device 40 the control-side data transmission / reception unit 400, control-side connection request reception unit described with reference to FIGS. 405, control side connection request transmission unit 410, connection request transmission control unit 415, standby period information storage unit 420, standby period information reception unit 425, location registration information reception unit 430, location registration unit 435, control side confirmation response reception unit 440 , Function as control side acknowledgment transmission unit 445, control side reception response reception unit 450, and control side reception response transmission unit 455.

  Further, the communication program installed and executed in the communication terminal 10 works on the CPU 1505 or the like to make the communication terminal 10 the terminal-side data transmission / reception unit 100, the mode control unit 102, and the terminal-side connection described with reference to FIGS. Request transmission unit 105, request input unit 107, terminal side confirmation response reception unit 110, output control unit 115, output unit 120, terminal side reception response reception unit 125, location registration information transmission unit 130, standby period information storage unit 135, notification Information reception unit 140, transmission request transmission unit 145, terminal side connection request reception unit 150, terminal side confirmation response transmission unit 155, terminal side reception response transmission unit 160, voice input unit 165, voice data transmission / reception unit 170, and voice data conversion Function as the unit 175.

  As mentioned above, although this invention was demonstrated using embodiment, the technical scope of this invention is not limited to the range as described in the said embodiment. It will be apparent to those skilled in the art that various modifications or improvements can be added to the above embodiment. It is apparent from the scope of the claims that the embodiments added with such changes or improvements can be included in the technical scope of the present invention.

1 is a conceptual diagram of a communication system 60. FIG. 3 is a block diagram showing a functional configuration of a communication relay device 20. FIG. 3 is a block diagram showing a functional configuration of a communication control device 40. FIG. 2 is a block diagram showing a functional configuration of a communication terminal 10. FIG. It is a sequence diagram which shows the process between the communication terminal 10 and the communication relay apparatus 20. FIG. 3 is a sequence diagram showing a processing flow in the communication terminal 10. FIG. 6 is a sequence diagram showing a flow of processing in the communication relay device 20. FIG. 6 is a sequence diagram showing a flow of processing in the communication control device 40. FIG. 6 is a sequence diagram showing a flow of processing in the communication control device 40. It is a sequence diagram which shows call control by SIP. It is a sequence diagram which shows call control by SIP. 2 is a block diagram illustrating hardware configurations of a communication terminal 10, a communication relay device 20, and a communication control device 40. FIG.

Explanation of symbols

10 communication terminal 20 communication relay device 30 router 40 communication control device 50 MGW
60 communication system 70, 72 client side network 74 IP network 76 server side network 78 voice public network 100 terminal side data transmission / reception unit 102 mode control unit 105 terminal side connection request transmission unit 107 request input unit 110 terminal side confirmation response reception unit 115 output Control unit 120 Output unit 125 Terminal side reception response reception unit 130 Location registration information transmission unit 135 Standby period information storage unit 140 Notification information reception unit 145 Transmission request transmission unit 150 Terminal side connection request reception unit 155 Terminal side confirmation response transmission unit 160 Terminal Side reception response transmission unit 165 voice input unit 170 voice data transmission / reception unit 175 voice data conversion unit 200 relay side data transmission / reception unit 205 transmission request reception unit 210 relay side connection request transmission unit 215 relay side connection request reception unit 220 connection request storage unit 225 Relay side acknowledgment transmission unit 230 Relay side acknowledgment reception unit 235 Notification information transmission unit 240 Relay side reception response reception unit 245 Relay side reception response transmission unit 400 Control side data transmission / reception unit 405 Control side connection request reception unit 410 Control side connection request Transmission unit 415 Connection request transmission control unit 420 Standby period information storage unit 425 Standby period information reception unit 430 Location registration information reception unit 435 Location registration unit 440 Control side confirmation response reception unit 445 Control side confirmation response transmission unit 450 Control side reception response reception Unit 455 Control side reception response transmission unit 1505 CPU
1510 ROM
1520 RAM
1530 Communication interface 1540 Hard disk drive 1550 Flexible disk drive 1560 CD-ROM drive 1570 Input / output chip 1575 Graphic controller 1580 Display device 1582 Host controller 1584 Input / output controller 1590 Flexible disk 1595 CD-ROM

Claims (11)

In a communication system comprising a server side network and a client side network connected to each other by an IP network, a wireless LAN access point provided in the client side network and communicating with a destination terminal by a wireless LAN,
A connection request for requesting establishment of a session between the calling terminal and the called terminal via a communication control device provided in the server side network and establishing a session between the calling terminal and the called terminal; A connection request receiving unit that receives from the originating terminal;
When the connection request receiving unit receives the connection request, a notification information transmitting unit that transmits notification information for notifying the called terminal that the connection request for the called terminal has been received, to the called terminal. When,
An acknowledgment receiving unit that receives an acknowledgment from the called terminal indicating that the called terminal has received the notification information;
After the connection request receiving unit receives the connection request, the confirmation response receiving unit transmits the confirmation response to the communication control device before the confirmation response receiving unit receives the confirmation response from the destination terminal; A wireless LAN access point . When the confirmation response transmitting unit transmits the confirmation response to the communication control device before the confirmation response receiving unit receives the confirmation response from the destination terminal, the confirmation response receiving unit transmits the confirmation response. The wireless LAN access point according to claim 1, wherein the confirmation response is not transmitted to the communication control apparatus after being received from the called terminal. In response to the connection request, the communication control device, when not receiving the confirmation response from the confirmation response transmission unit , repeatedly transmits the connection request to the connection request reception unit at a predetermined time interval,
The confirmation response transmission unit transmits the confirmation response to the communication control device after the predetermined time interval elapses after the connection request reception unit receives the connection request. The wireless LAN access point according to 1 or 2 . The wireless LAN access point includes a memory that receives and stores information indicating the predetermined time interval from the communication control device,
The confirmation response transmission unit transmits the confirmation response to the communication control unit after the connection request reception unit receives the connection request until the predetermined time interval stored in the memory elapses. Send to device
The wireless LAN access point according to claim 3. In response to the connection request, the communication control device, when not receiving the confirmation response from the confirmation response transmission unit , repeatedly transmits the connection request to the connection request reception unit ,
The acknowledgment transmitting unit, before the acknowledgment response receiving unit receives the acknowledgment from the called party terminal by transmitting the acknowledgment to the communication control device, the connection request to the communication control device The wireless LAN access point according to claim 1 or 2 , wherein the wireless LAN access point is not repeatedly transmitted. In a communication system including a server side network and a client side network connected to each other by an IP network, a communication method is provided in the client side network and executed by a wireless LAN access point that communicates with a destination terminal via a wireless LAN. And
A connection request for requesting establishment of a session between the calling terminal and the called terminal via a communication control device provided in the server side network and establishing a session between the calling terminal and the called terminal; Receiving a connection request from the calling terminal;
When the connection request is received in the connection request reception stage, notification information is transmitted to the destination terminal for notification information for notifying the destination terminal that the connection request for the destination terminal has been received. Stages,
An acknowledgment reception step of receiving an acknowledgment from the called terminal indicating that the called terminal has received the notification information;
Acknowledgment transmission for transmitting the confirmation response to the communication control apparatus after the connection request is received in the connection request reception stage and before the confirmation response is received from the destination terminal in the confirmation response reception stage. A communication method comprising: In a communication system comprising a server-side network and a client-side network connected to each other by an IP network , a communication program for a wireless LAN access point provided in the client-side network and communicating with a called-side terminal by a wireless LAN , The wireless LAN access point is
A connection request for requesting establishment of a session between the calling terminal and the called terminal via a communication control device provided in the server side network and establishing a session between the calling terminal and the called terminal; , A connection request receiving unit that receives from the calling terminal,
When the connection request receiving unit receives the connection request, a notification information transmitting unit that transmits notification information for notifying the called terminal that the connection request for the called terminal has been received, to the called terminal. ,
An acknowledgment receiving unit for receiving an acknowledgment from the called terminal indicating that the called terminal has received the notification information;
After the connection request receiving unit receives the connection request, the confirmation response receiving unit transmits the confirmation response to the communication control device before the confirmation response receiving unit receives the confirmation response from the destination terminal. A communication program that functions. A communication system comprising a server side network and a client side network connected to each other by an IP network,
In the server side network, a communication control device for establishing a session between the calling terminal and the called terminal is provided ,
In the client side network, a wireless LAN access point that communicates with the called terminal via a wireless LAN is provided ,
The wireless LAN access point is
Through the communication control device, a connection request receiving unit that the connection request requests to establish a session with the called party terminal and the calling terminal is received from the calling terminal,
When the connection request receiving unit receives the connection request, a notification information transmitting unit that transmits notification information for notifying the called terminal that the connection request for the called terminal has been received, to the called terminal. When,
An acknowledgment receiving unit that receives an acknowledgment from the called terminal indicating that the called terminal has received the notification information;
After the connection request receiving unit receives the connection request, the confirmation response receiving unit transmits the confirmation response to the communication control device before the confirmation response receiving unit receives the confirmation response from the destination terminal; A communication system. The destination terminal has a standby mode in which data is not received and a communication mode in which data is received. After transition to the standby mode, when the standby period preset in the destination terminal has elapsed, the communication Transition to mode
The communication control device includes:
A standby period information storage unit for storing standby period information indicating the length of the standby period set in advance on the destination terminal;
A connection request receiving unit for receiving a connection request for requesting establishment of a session between the calling terminal and the called terminal from the calling terminal;
A connection request transmitter for transmitting the connection request to the called terminal;
When the connection request reception unit receives the connection request, the connection request transmission unit transmits the connection request to the destination terminal, and the connection request transmission unit transmits the connection request to the destination terminal. When the waiting period of the length indicated by the waiting period information stored in the waiting period information storage unit has elapsed since the transmission, the connection request is sent to the connection request transmitting unit to the destination terminal. The communication system according to claim 8, further comprising a connection request transmission control unit configured to transmit again. The communication control device includes:
A standby period information receiving unit for receiving the standby period information transmitted from the destination terminal;
The communication system according to claim 9 , wherein the standby period information storage unit stores the standby period information received by the standby period information reception unit. The destination terminal transmits the location registration information transmitted to the communication control device for location registration, with the waiting period information attached thereto,
The waiting period information receiving unit receives the location registration information accompanied by the waiting period information,
The communication system according to claim 10 , wherein the waiting period information storage unit stores the waiting period information attached to the location registration information received by the waiting period information receiving unit.

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