JP2012083924A - Notification device, notification system, terminal, notification method, and notification program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a notification device capable of notifying a terminal of a message so that the terminal certainly acquires presence information of other terminals, as well as a notification system, a terminal, a notification method, and a notification program.SOLUTION: A notification device 10 receives SUBSCRIBE transmitted from a terminal 11 (S17). The notification device 10 acquires one piece of state information corresponding to a presentity ID, and stores the acquired presentity ID in NOTIFY to be transmitted to the terminal 11 since the number of presentity IDs to be specified by the SUBSCRIBE is one (S21). The notification device 10 receives SUBSCRIBE transmitted from a terminal 12 (S39). The notification device 10 acquires two pieces of state information corresponding to presentity IDs, and stores the two pieces of state information in 200 OK to be transmitted to the terminal 12 at once since the number of presentity IDs to be specified by the SUBSCRIBE is two or more (S41).

Description

  The present invention relates to a notification device, a notification system, a terminal device, a notification method, and a notification program. More specifically, the present invention relates to a notification device, a notification system, a terminal device, a notification method, and a notification program that notify presence information of a terminal device.

  There is known a service in which a terminal device can know information about other terminal devices connected to a network and the state of the user. Hereinafter, the information regarding the status of the terminal device and its user is also referred to as presence information. In this service, a notification device that manages presence information is usually used. The terminal device requests presence information of another terminal device from the notification device. The notification device identifies the requested presence information of the other terminal device and notifies the terminal device. As a result, the terminal device can acquire presence information of other terminal devices. Hereinafter, a terminal device that requests presence information is also referred to as a “watcher”. Other terminal devices for which presence information is required are also referred to as “presentity”. The notification device is also referred to as a “presence server”. An example of the service described above is a service using SIP (Session Initiation Protocol).

  In a service using SIP, when the presence server notifies the watcher of presence information of a plurality of presentities, it is necessary to create one message for each presence information and send it to the watcher. On the other hand, in the method described in Patent Document 1, when there are a plurality of presence information items to be transmitted to the same watcher, the presence server can store these information items in one message and transmit them. The watcher can acquire presence information of a plurality of presentities by extracting a plurality of presence information from the received message.

JP 2004-72485 A

  There are cases where a terminal device capable of recognizing a message storing a plurality of presence information and an existing terminal device unable to recognize the message coexist in the network. In this case, since a terminal device that cannot be recognized cannot extract a plurality of presence information from the received message, there is a problem that the presence information of other terminal devices may not be acquired.

  An object of the present invention is to provide a notification device, a notification system, a terminal device, a notification method, and a notification program capable of notifying a terminal device of a message so that the terminal device can reliably acquire presence information of another terminal device. It is in.

  In the notification device according to the first aspect of the present invention, identification information for identifying a terminal device connected via a network and state information indicating a state of the terminal device and a user of the terminal device are stored in association with each other. Two or more of the request packets received by the receiving means, the receiving means for receiving the request packet for requesting the status information of the other terminal apparatus, transmitted from the terminal apparatus, and the request packet received by the receiving means. It is determined by the first determination means that determines whether or not the status information of another terminal device is requested, and the first determination means determines that the status information of two or more other terminal devices is requested. In the case, two or more of the identification information of the two or more other terminal devices is judged by the second judgment means and the second judgment means to judge whether or not all the identification information is stored in the storage means. When it is determined that all the identification information of the terminal device is stored in the storage unit, two or more pieces of status information corresponding to the identification information of two or more other terminal devices are stored in the storage unit. A first acquisition unit that acquires the status information acquired by the first acquisition unit in a first notification packet, the first notification packet to the terminal device that has transmitted the request packet And first transmission means for transmitting.

  According to the first aspect, when the notification device receives a request packet requesting status information of two or more other terminal devices, the notification device acquires the corresponding two or more status information and transmits the request packet. To notify. The notification device can determine whether to notify two or more pieces of state information collectively based on the number of pieces of state information requested by the request packet. When the notification device determines that two or more pieces of state information stored in the first notification packet can be recognized together in the terminal device, the notification device collectively notifies the terminal device of two or more pieces of state information. Thus, the notification device can notify the terminal device of the status information in a manner that can be recognized by the terminal device that transmitted the request packet.

  In the first aspect, when the second determination unit determines that at least one of the identification information of the two or more other terminal devices is not stored in the storage unit, the state information is You may provide the 2nd transmission means which transmits the 2nd notification packet which notifies that it cannot be acquired with respect to the said terminal device which transmitted the said request packet. The notification device can notify the terminal device that the state information cannot be acquired when all of the requested state information cannot be acquired. As a result, the terminal device can recognize that the desired other terminal device does not exist within the network and service range managed by the notification device.

  Further, in the first aspect, the first transmission means determines that the data size of the state information is equal to or less than the predetermined value when the data size of the state information stored in the first notification packet is larger than a predetermined value. The first notification packet may be divided and stored in the first notification packet. By dividing and transmitting the first notification packet in advance, it is possible to avoid a router, a server, or the like intervening in the network from dividing the first notification packet. As a result, the processing load on the router or server can be reduced, so that the first notification packet is reliably transferred by the router or server and reaches the terminal device. Accordingly, the terminal device can reliably receive the first notification packet transmitted from the notification device and acquire the state information.

  Further, in the first aspect, the first acquisition means determines that at least one of the identification information of the two or more other terminal devices is not stored in the storage means by the second determination means. In this case, the status information corresponding to the identification information stored in the storage unit may be acquired from the identification information of two or more terminal devices. When all of the requested status information cannot be acquired, the notification device can acquire only the status information that can be acquired and notify the terminal device. As a result, the terminal device does not need communication for ascertaining status information that can be acquired by the notification device and requesting it again, thereby suppressing network traffic. Further, the terminal device can acquire the state information that can be acquired by the notification device in a short time.

  Further, in the first aspect, when the first determination unit determines that the state information of one other terminal device is requested, the first information corresponds to the identification information of the one other terminal device. The second acquisition unit that acquires the one state information from the storage unit, the one state information acquired by the second acquisition unit is stored in a third notification packet, and the request packet is transmitted You may provide the 3rd transmission means which transmits the said 3rd notification packet with respect to a terminal device. If the terminal device cannot process two or more pieces of identification information stored in the first notification packet together, the notification device can store one state information in the first notification packet. As a result, the terminal device can reliably acquire the state information.

  A communication system according to a second aspect of the present invention includes a terminal device connected to a network, and a notification device that notifies the terminal device of state information indicating a state of the terminal device and a user of the terminal device. In the notification system, the notification device includes a storage unit in which identification information for identifying the terminal device and the state information are stored in association with each other, and another terminal device transmitted from the terminal device. The first receiving means for receiving the request packet for requesting the state information and the request packet received by the first receiving means determine whether the state information of two or more other terminal devices is requested. Two or more other terminals when it is determined by the first determining means and the first determining means that the state information of two or more other terminal devices is requested. Second identification means for determining whether all of the identification information of the device is stored in the storage means, and all of the identification information of the two or more other terminal devices are stored in the storage means by the second determination means. A first acquisition unit that acquires, from the storage unit, two or more state information corresponding to the identification information of two or more other terminal devices when it is determined that Two or more of the state information acquired by the first notification packet, and a first transmission means for transmitting the first notification packet to the terminal device that transmitted the request packet, the terminal device Is a terminal transmitting means for transmitting the request packet for requesting the status information of one or more of the other terminal devices to the notification device, and two or more of the other terminal devices by the terminal transmitting means. If the request packet requesting the state information of the end device has been transmitted, and a terminal receiving means for receiving the first notice packet transmitted from the notification device.

  According to the second aspect, when the notification device receives a request packet requesting status information of two or more other terminal devices, the notification device acquires the corresponding two or more status information and transmits the request packet. To notify. The notification device can determine whether to notify two or more pieces of state information collectively based on the number of pieces of state information requested by the request packet. When the notification device determines that two or more pieces of state information stored in the first notification packet can be recognized together in the terminal device, the notification device collectively notifies the terminal device of two or more pieces of state information. Thus, the notification device can notify the terminal device of the status information in a manner that can be recognized by the terminal device that transmitted the request packet. Also, the terminal device can acquire two or more status information simultaneously by transmitting a request packet for requesting status information of two or more other terminal devices. As a result, it is possible to suppress communication necessary for acquiring the state information, and it is possible to prevent an increase in communication traffic.

  A terminal device according to a third aspect of the present invention includes a terminal transmission unit that transmits the request packet for requesting the status information of one or more other terminal devices to the notification device, and the terminal transmission When the request packet requesting the status information of two or more other terminal devices is transmitted by the means, the first notification packet transmitted from the notification device, and transmitted by the terminal transmission device Terminal receiving means for receiving the first notification packet storing the status information of the two or more other terminal devices requested by the request packet.

  According to the third aspect, the terminal device can acquire two or more state information simultaneously by transmitting a request packet for requesting the state information of two or more other terminal devices. As a result, it is possible to suppress communication necessary for acquiring the state information, and it is possible to prevent an increase in communication traffic.

  A communication method according to a fourth aspect of the present invention receives a request packet for requesting the status information indicating the status of another terminal device and the user of the terminal device, transmitted from a terminal device connected via a network. A first judging step for judging whether the status information of two or more other terminal devices is requested by the request packet received by the receiving step, and the first judging step, When it is determined that the state information of two or more other terminal devices is requested, the storage unit stores the identification information for identifying the terminal device and the state information in association with each other. A second determination step for determining whether all the identification information of the two or more other terminal devices is stored in the storage means, and the second determination step. And when it is determined that all the identification information of the two or more other terminal devices is stored in the storage means, the two or more of the two or more other terminal devices corresponding to the identification information of the other terminal devices A first acquisition step of acquiring state information from the storage means; and two or more of the state information acquired by the first acquisition step are stored in a first notification packet, and the terminal device that has transmitted the request packet A first transmission step of transmitting the first notification packet.

  According to the fourth aspect, when a request packet requesting status information of two or more other terminal devices is received, the corresponding two or more status information is acquired and notified to the terminal device that transmitted the request packet To do. The notification device can determine whether to notify two or more pieces of state information collectively based on the number of pieces of state information requested by the request packet. When the notification device determines that two or more pieces of state information stored in the first notification packet can be recognized together in the terminal device, the notification device collectively notifies the terminal device of two or more pieces of state information. Thus, the notification device can notify the terminal device of the status information in a manner that can be recognized by the terminal device that transmitted the request packet.

  The communication program which concerns on the 5th aspect of this invention is a request packet which requests | requires the said state information which shows the state of the user of the said other terminal device and the said other terminal device transmitted from the terminal device connected via the network A first judging step for judging whether the status information of two or more other terminal devices is requested by the request packet received by the receiving step, and the first judging step Storage means for storing identification information for identifying the terminal device and the state information in association with each other when it is determined that the state information of two or more other terminal devices is requested by A second determination step of determining whether or not all the identification information of the two or more other terminal devices is stored in the storage means, and the second determination step Two or more corresponding to the identification information of the two or more other terminal devices when it is determined that all the identification information of the two or more other terminal devices is stored in the storage means. A first acquisition step of acquiring the state information from the storage means; and two or more of the state information acquired by the first acquisition step are stored in a first notification packet, and the terminal that has transmitted the request packet Causing the computer to execute a first transmission step of transmitting the first notification packet to the apparatus.

  According to the fifth aspect, when a request packet requesting status information of two or more other terminal devices is received, the corresponding two or more status information is acquired and notified to the terminal device that transmitted the request packet To do. The notification device can determine whether to notify two or more pieces of state information collectively based on the number of pieces of state information requested by the request packet. When the notification device determines that two or more pieces of state information stored in the first notification packet can be recognized together in the terminal device, the notification device collectively notifies the terminal device of two or more pieces of state information. Thus, the notification device can notify the terminal device of the status information in a manner that can be recognized by the terminal device that transmitted the request packet.

1 is a diagram illustrating an overview of a communication system 1 and electrical configurations of a notification device 10 and a terminal device 14. It is a figure which shows a communication sequence. It is a figure which shows the 1st table 241. FIG. It is a figure which shows the 2nd table 242. It is a flowchart which shows the notification main process. It is a flowchart which shows a terminal main process.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. These drawings are used to explain technical features that can be adopted by the present invention. The configuration of the apparatus, the flowcharts of various processes, and the like that are described are not intended to be limited to only that, but are merely illustrative examples.

  The communication system 1 will be described with reference to FIG. The communication system 1 includes a notification device 10, and terminal devices 11, 12, and 13 (hereinafter referred to as “terminal device 14” when they are not distinguished from each other). The notification device 10 and the terminal device 14 are connected to the network 3. The notification device 10 and the terminal device 14 can communicate via the network 3. In addition, the code | symbol (11,12,13) attached | subjected to the communication apparatus 14 shall also show ID of each communication apparatus 14. FIG.

  The notification device 10 is a presence server that provides a presence service based on SIP (Session Initiation Protocol). The terminal device 14 is a known PC. In the presence service, the status information indicating the status of the terminal device 14 and the status of the user using the terminal device 14 is notified from the notification device 10 to the terminal device 14. In the terminal device 14, an image for notifying the user of the state information acquired from the notification device 10 is output from the output unit 36 (display). The user of the terminal device 14 can recognize the other terminal device 14 and the state of the user who uses the other terminal device 14 (such as “login”, “logout”, “away”).

  The electrical configuration of the notification device 10 will be described. The notification device 10 includes a CPU 21 that controls the notification device 10. The CPU 21 is electrically connected to the ROM 22, RAM 23, hard disk drive (HDD) 24, communication unit 25, and drive device 26. The ROM 22 stores a boot program, BIOS, OS, and the like. The RAM 23 stores a timer, a counter, and temporary data. The HDD 24 stores a control program for the CPU 21. The HDD 24 stores a first table and a second table. The first table is a table for managing the presentity ID and the state information in association with each other. The second table is a table for managing watcher IDs and presentity IDs. Details of the first table and the second table will be described later. The communication unit 25 performs timing control when communicating with the terminal device 14 via the network 3. The drive device 26 can read information stored in the storage medium 261. For example, when the notification device 10 is set up, the control program stored in the storage medium 261 is read by the drive device 26 and stored in the HDD 24.

  The electrical configuration of the terminal device 14 will be described. The terminal device 14 includes a CPU 31 that controls the terminal device 14. The CPU 31 is electrically connected to the ROM 32, RAM 33, HDD 34, input unit 35, output unit 36, communication unit 37, and drive device 38. The ROM 32 stores a boot program, BIOS, OS, and the like. The RAM 33 stores timers, counters, and temporary data. The HDD 34 stores a control program for the CPU 31. The input unit 35 is a keyboard or a mouse that receives input from the user. The output unit 36 is a display that displays a desired image. The communication unit 37 performs timing control when communicating with the notification device 10 via the network 3. The drive device 38 can read information stored in the storage medium 381. For example, when the terminal device 14 is set up, the control program stored in the storage medium 381 is read by the drive device 38 and stored in the HDD 34.

  A communication method executed when the terminal device 14 acquires state information from the notification device 10 will be described with reference to FIG. In the present embodiment, the terminal device 11 and the terminal device 12 differ in the communication method executed when the status information is acquired from the notification device 10. The terminal device 11 designates one presentity and requests corresponding status information from the notification device 10. The notification device 10 notifies one state information corresponding to one designated presentity to the terminal device 11 which is a watcher. Therefore, when the terminal device 11 wants to acquire state information corresponding to a plurality of presentities, the terminal device 11 needs to repeat communication with the notification device 10 by the number of presentities. This method is based on a state information acquisition method that is normally performed based on SIP.

  As illustrated in FIG. 2, the terminal device 11 first transmits a packet requesting registration (hereinafter referred to as “REGISTER”) to the notification device 10. The notification device 10 receives REGISTER (S11). The notification device 10 registers the terminal device 11 by storing the ID of the terminal device 11 that has transmitted REGISTER in a first table (details will be described later) stored in the HDD 24. Subsequently, the terminal device 11 transmits a packet (hereinafter referred to as “PUBLISH”) for notifying state information corresponding to the terminal device 11 to the notification device 10. PUBLISH stores state information “login”. The notification device 10 receives PUBLISH (S13). The notification device 10 acquires the status information “login” stored in the received PUBLISH and stores it in the first table (details will be described later). The notification device 10 transmits a positive response signal (hereinafter referred to as “200 OK”) to the terminal device 11. The terminal device 11 receives 200 OK (S15).

  With reference to FIG. 3, the first table 241 as an example of the first table will be described. The first table 241 stores a presentity ID and state information. When receiving the REGISTER (S11, see FIG. 2), the notification device 10 identifies the ID of the terminal device 11 that has transmitted the REGISTER, and stores it in the first table 241 as a presentity ID. Further, when receiving the PUBLISH (S13, see FIG. 2), the notification device 10 associates the status information “login” stored in the PUBLISH with the ID of the terminal device 11 that has transmitted the PUBLISH in the first table 241. Store. It is assumed that REGISTER and PUBLISH are also transmitted to the notification device 10 from the terminal devices 12 and 13 in the same manner. Accordingly, “presentity ID: 12, status information: login” “presentity ID: 13, status information: logout” is stored in the first table 241.

  In FIG. 2, it is assumed that the user of the terminal device 11 desires to obtain state information corresponding to the terminal devices 12 and 13. The terminal device 11 stores the ID of one of the terminal devices 12 and 13 (terminal device 12) corresponding to the presentity in a packet for requesting status information (hereinafter referred to as “SUBSCRIBE”). The terminal device 11 transmits the SUBSCRIBE storing the presentity ID (hereinafter referred to as “presentity ID”) “12” to the notification device 10. The notification device 10 receives SUBSCRIBE (S17). The notification device 10 stores the ID “11” of the terminal device 11 that transmitted the SUBSCRIBE and the presentity ID “12” stored in the SUBSCRIBE in a second table (details will be described later) stored in the HDD 24. The notification device 10 transmits 200 OK to the terminal device 11. The terminal device 11 receives 200 OK (S19).

  With reference to FIG. 4, the second table 242 which is an example of the second table stored in the HDD 24 will be described. The second table 242 stores a watcher ID and a presentity ID. When receiving the SUBSCRIBE (see S17, FIG. 2), the notification device 10 stores the ID “11” of the terminal device 11 that has transmitted the SUBSCRIBE in the second table 242 as a watcher ID. Further, the notification device 10 acquires the presentity ID “12” stored in the received SUBSCRIBE and stores it in the second table 242 in association with the watcher ID.

  In FIG. 2, after transmitting 200 OK to the terminal device 11, the notification device 10 acquires the status information corresponding to the presentity ID “12” stored in the SUBSCRIBE received in S <b> 17 from the first table. . In the first table 241 of FIG. 3, since the status information “login” is associated with the presentity ID “12”, the notification device 10 acquires “login” as the status information. The notification device 10 associates the acquired state information “login” with the presentity ID “12” and stores them in a packet (hereinafter referred to as “NOTIFY”) that notifies the state information. The notification device 10 transmits NOTIFY to the terminal device 11. The terminal device 11 receives NOTIFY (S21). Thereby, the terminal device 11 acquires the status information “login” corresponding to the terminal device 12 requested by SUBSCRIBE in S17. The terminal device 11 transmits 200 OK to the notification device 10, and the notification device 10 receives 200 OK (S23).

  Subsequently, the terminal device 11 transmits SUBSCRIBE to the notification device 10 in order to acquire the state information corresponding to the terminal device 13 that is the other presentity among the terminal devices 12 and 13 that desire the state information. . Presentity ID “13” is stored in SUBSCRIBE. The notification device 10 receives SUBSCRIBE (S25). The notification device 10 stores the ID “11” of the terminal device 11 that has transmitted SUBSCRIBE as a watcher ID in the second table. Further, the notification device 10 stores the presentity ID “13” stored in the SUBSCRIBE in the second table. If the same watcher ID “11” is already stored as in the second table 242 of FIG. 4, the presentity ID “13” is added to the existing presentity ID “12” and associated. And stored. The notification device 10 transmits 200 OK to the terminal device 11, and the terminal device 11 receives 200 OK (S27).

  The notification device 10 acquires status information corresponding to the presentity ID “13” stored in the SUBSCRIBE received in S25 from the first table. In the first table 241 of FIG. 3, since the status information “logout” is associated with the presentity ID “13”, the notification device 10 acquires “logout” as the status information. The notification device 10 transmits to the terminal device 11 NOTIFY in which the presentity ID “13” and the state information “logout” are stored in association with each other. The terminal device 11 receives NOTIFY (S29). Thereby, the terminal device 11 acquires the status information “logout” corresponding to the terminal device 13 requested by SUBSCRIBE in S25. The terminal device 11 transmits 200 OK to the notification device 10, and the notification device 10 receives 200 OK (S31). As described above, the notification device 10 notifies the terminal device 11 of status information in response to a request from the terminal device 11.

  On the other hand, unlike the terminal device 11, the terminal device 12 stores two or more presentity IDs in one SUBSCRIBE and transmits the corresponding two or more status information to the notification device 10 at a time. Can request. When two or more pieces of state information are requested by one SUBSCRIBE, the notification device 10 stores the requested two or more pieces of state information in 200 OK and transmits them to the terminal device 12. As a result, the notification device 10 can simultaneously notify the terminal device 12 of a plurality of state information. The notification device 10 prevents an increase in traffic by suppressing communication required when notifying the terminal device 12 of the state information.

  As shown in FIG. 2, the terminal device 12 is registered in the notification device 10 by REGISTER transmitted from the terminal device 12 (S33). The ID “12” of the terminal device 12 is stored in the first table as a presentity ID. Subsequently, status information corresponding to the terminal device 12 is notified to the notification device 10 by PUBLISH (login) transmitted from the terminal device 12 (S35). The status information “login” is stored in the first table in association with the presentity ID “12”. 200 OK is transmitted from the notification device 10 to the terminal device 12 (S37). The above processing is the same as S11, S13, and S15 described above.

  It is assumed that the user of the terminal device 12 desires to acquire state information corresponding to the terminal devices 11 and 13. The terminal device 12 stores the ID “11” of the terminal device 11 and the ID “13” of the terminal device 13 in the SUBSCRIBE as a presentity ID. The terminal device 12 transmits SUBSCRIBE in which the presentity ID is stored to the notification device 10. The notification device 10 receives SUBSCRIBE (S39). The notification device 10 acquires the status information corresponding to the presentity ID “11” stored in the received SUBSCRIBE and the status information corresponding to the presentity ID “13” from the first table. In the first table 241 of FIG. 3, the status information “login” is associated with the presentity ID “11”, and the status information “logout” is associated with the presentity ID “13”. The status information “login” and “logout” are acquired. The notification device 10 associates the acquired state information with the presentity ID, stores them in 200 OK, and transmits them to the terminal device 12. The terminal device 12 receives 200 OK (S41). As a result, the terminal device 12 confirms the response to the SUBSCRIBE transmitted in S39, and at the same time, the status information “login” corresponding to the terminal device 11 requested by the SUBSCRIBE in S39 and the status information “logout” corresponding to the terminal device 13. Can be acquired at once.

  It is assumed that PUBLISH (login) is transmitted from the terminal device 13 to the notification device 10 (S43). In the first table, the status information corresponding to the presentity ID “13” is updated to “login”. In such a case, the notification device 10 performs the following communication in order to notify the updated state information to the other terminal devices 14.

  The notification device 10 refers to the second table. When the ID “13” of the terminal device 13 that transmitted PUBLISH (login) is stored in the second table as a presentity ID, the notification device responds to the terminal device 14 specified by the corresponding watcher ID. , Notify the updated status information. In the second table 242 of FIG. 4, the presenter ID “13” is associated with the watcher IDs “11” and “12”. Therefore, the notification device 10 transmits NOTIFY storing the state information “login” corresponding to the terminal device 13 to the terminal device 11 (S45). Further, the notification device 10 transmits NOTIFY storing the state information “login” corresponding to the terminal device 13 to the terminal device 12 (S47). As described above, when the state information once notified to the terminal device 14 is updated, the notification device 10 can notify the terminal device 14 of the updated state information again.

  As described above, the notification device 10 determines whether or not two or more pieces of state information are to be notified collectively based on the number of pieces of state information requested by the SUBSCRIBE. As a result, the notification device 10 can notify the terminal device 14 of the status information in such a manner that the terminal device 14 that transmitted the SUBSCRIBE can recognize. Moreover, in the presence service based on normal SIP, many communication procedures are required as shown by the communication (S11 to S31) executed in the terminal device 11. On the other hand, the notification device 10 can store the status information in 200 OK, which is a positive response packet, and notify the terminal device 14 according to the situation. As a result, the notification device 10 can suppress the amount of communication necessary for the presence service.

  For example, in the terminal device 11, the status information is acquired only based on a communication method that is normally performed based on the SIP. Therefore, even when a message storing a plurality of status information is received, a plurality of status information is acquired from the message. Can not do it. Furthermore, the terminal device 11 cannot acquire state information from 200 OK. Therefore, the notification device 10 notifies the terminal device 11 by storing one state information in NOTIFY based on a communication method normally performed based on SIP. On the other hand, since the terminal device 12 can acquire the state information from the 200 OK in which the plurality of state information is stored, the notification device 10 uses the 200 OK in which the plurality of state information is stored, Notice. As described above, the notification device 10 selects an optimal communication method for each terminal device 14 even when a plurality of terminal devices 14 having different communication methods for acquiring state information coexist in the network 3. The status information can be notified.

  With reference to FIG. 5, the notification main process performed in CPU21 of the notification apparatus 10 is demonstrated. The notification main process is activated and executed by the CPU 21 when the power is turned on.

  It is determined whether SUBSCRIBE has been received from the terminal device 14 (S51). When the SUBSCRIBE is received from the terminal device 14 (S51: YES), the ID of the terminal device 14 that has transmitted the SUBSCRIBE is stored in the second table as a watcher ID. The presentity ID stored in the SUBSCRIBE is stored in the second table in association with the watcher ID (S53).

  It is determined whether or not two or more presentity IDs are stored in SUBSCRIBE (S63). When there is only one presentity ID stored in the SUBSCRIBE (S63: NO), even if the terminal device 14 that transmitted the SUBSCRIBE receives a message storing a plurality of status information, the status information is received from this message. May not be able to get. In this case, 200 OK is transmitted to the terminal device 14 that transmitted SUBSCRIBE (S81). The presentity ID stored in the SUBSCRIBE received in S51 is acquired. The first table is referenced. Status information corresponding to the acquired presentity ID is acquired (S83). A NOTIFY storing the acquired state information and the presentity ID is created (S85). The created NOTIFY is transmitted to the terminal device 14 that transmitted SUBSCRIBE (S87). The process returns to S51. As described above, when the notification device 10 determines that there is a possibility that the terminal device 14 cannot process a message storing a plurality of state information, the notification device 10 transmits a message (NOTIFY) storing one state information to the terminal. Transmit to device 14. As a result, the terminal device 14 can reliably acquire the state information.

  On the other hand, if two or more presentity IDs are stored in the SUBSCRIBE received in S51 (S63: YES), the terminal device 14 that transmitted the SUBSCRIBE obtains the state information from the message storing a plurality of state information. It is judged that it can be done. The presentity ID stored in the SUBSCRIBE is stored in the RAM 23. It is determined whether two or more presentity IDs stored in the RAM 23 are all stored in the first table (S65). When two or more presentity IDs stored in the RAM 23 are all stored in the first table (S65: YES), status information corresponding to the presentity ID is notified to the terminal device 14 that transmitted the SUBSCRIBE. The process for this is performed as follows.

  Two or more presentity IDs stored in the RAM 23 are selected one by one. The first table is referenced. Status information corresponding to the selected presentity ID is acquired (S67). It is determined whether the total data size of the acquired state information is larger than a predetermined value (S69). The predetermined value is determined based on, for example, the maximum data size that can be transferred by a router or server interposed in the network 3. If the total data size is equal to or smaller than the predetermined value (S71: NO), the process returns to S67. Unselected presentity IDs are selected in order from the RAM 23, the corresponding state information is acquired (S67), and the process is repeated.

  When the total data size of the status information becomes larger than the predetermined value (S69: YES), one status information is removed so that the total data size becomes equal to or smaller than the predetermined value. The presentity ID corresponding to the removed state information is returned to the RAM 23. The status information adjusted so that the total data size is equal to or smaller than the predetermined value and the corresponding presentity ID are stored in 200 OK, and 200 OK is created (S71). The created 200 OK is transmitted to the terminal device 14 that transmitted SUBSCRIBE (S73). It is determined whether or not an unselected presentity ID remains in the RAM 23 (S75). If an unselected presentity ID remains in the RAM 23 (S75: YES), the process returns to S67. The process is repeated to store and send the remaining presentity ID and corresponding status information in 200 OK. On the other hand, when all the presentity IDs stored in the RAM 23 are selected (S75: NO), the process returns to S51.

  As described above, when the number of state information requested by SUBSCRIBE is two or more, the notification device 10 determines that two or more pieces of state information can be notified together, and sends the state information to the terminal device 14. Is informed. In addition, the notification device 10 divides the state information so that the total data size is equal to or less than a predetermined value, stores it in 200 OK, and transmits it to the terminal device 14. As a result, it is possible to prevent the routers, servers, and the like interposed in the network 3 from dividing the 200 OK. Accordingly, since the processing load on the router or server can be reduced, the 200 OK is reliably transferred by the router or server and reaches the terminal device 14. The terminal device 14 can reliably receive the 200 OK transmitted from the notification device 10 and acquire the state information.

  In the above description, it is determined whether the total data size of the state information is larger than a predetermined value. For example, the total of the data size of the state information and the data size of the corresponding presentity ID is larger than the predetermined value. It may be judged. It may also be determined whether the total number of state information is greater than a predetermined value.

  In S65, if there is a presentity ID that is not stored in the first table among the two or more presentity IDs stored in the RAM 23 (S65: NO), all the corresponding state information cannot be acquired. In this case, a presentity ID not stored in the first table is stored in a packet (hereinafter referred to as “481”) notifying that status information cannot be acquired, so that 481 is created (S77). The created 481 is transmitted to the terminal device 14 that transmitted SUBSCRIBE (S79). The process returns to S51.

  As described above, the notification device 10 may notify the terminal device 14 together with the corresponding ID that the state information cannot be acquired when all of the state information corresponding to the presentity ID specified by the SUBSCRIBE cannot be specified. it can. Accordingly, the terminal device 14 can recognize that the desired terminal device 14 does not exist within the network 3 or service range managed by the notification device 10. For example, when the notification device 10 manages the status information of the terminal device 14 participating in the video conference, the terminal device 14 that has received 481 has one of the desired terminal devices 14 participating in the video conference. Can recognize that not.

  In S51, when SUBSCRIBE is not received from the terminal device 14 (S51: NO), it is determined whether PUBLISH is received from the terminal device 14 (S55). When PUBLISH is received from the terminal device 14 (S55: YES), the state information stored in PUBLISH is stored in the first table in association with the ID of the terminal device 14 that has transmitted PUBLISH (S57). If the state information is already associated with the ID of the terminal device 14 that has transmitted PUBLISH, the state information is updated.

  It is determined whether the ID of the terminal device 14 that has transmitted PUBLISH is stored as a presentity ID in the second table (S59). When the ID of the terminal device 14 that has transmitted PUBLISH is stored as a presentity ID in the second table (S59: YES), it is necessary to notify the terminal device 14 of the state information stored in PUBLISH. . The process proceeds to S83. Status information corresponding to the ID of the terminal device 14 that has transmitted PUBLISH is acquired from the first table (S83). A NOTIFY storing the acquired state information is created (S85). In the second table, the watcher ID corresponding to the presentity ID that matches the ID of the terminal device 14 that has transmitted PUBLISH is specified. NOTIFY is transmitted to the terminal device 14 with the specified watcher ID (S87). The process returns to S51. As described above, the notification device 10 can notify the terminal device 14 of the updated state information when the state information is updated.

  In S55, when PUBLISH is not received from the terminal device 14 (S55: NO), it is determined whether an instruction to end the notification of the state information is input by the user of the notification device 10 (S61). When an instruction to end the notification of the state information is input (S61: YES), the notification main process ends. When the instruction to end the notification of the state information is not input (S61: NO), the process returns to S51.

  As described above, when the notification device 10 receives a SUBSCRIBE requesting the status information of two or more terminal devices 14, the notification device 10 transmits the status information by the 200 OK in which the corresponding two or more status information is stored. To notify. On the other hand, when receiving the SUBSCRIBE requesting one state information, the notifying device 10 sends the state information to the terminal device 14 by NOTIFY storing the one state information based on the normal communication method using SIP. Notice. As a result, the notification device 10 can notify the terminal device 14 of the status information in such a manner that the terminal device 14 that transmitted the SUBSCRIBE can recognize.

  With reference to FIG. 6, the terminal main process performed in CPU31 of the terminal device 12 is demonstrated. The notification main process is activated and executed by the CPU 31 when the CPU 31 is powered on. The CPU 31 of the terminal device 11 executes a well-known communication process that acquires state information one by one based on a method that is normally performed based on SIP. Therefore, hereinafter, only processing executed by the CPU 31 of the terminal device 12 that can acquire two or more pieces of state information at a time will be described, and description of processing executed by the CPU 31 of the terminal device 11 will be omitted.

  It is determined whether the user of the terminal device 12 has input an instruction to acquire state information together with the presentity ID (S91). When an instruction to acquire state information is input (S91: YES), the presentity ID input at the same time is acquired and stored in the RAM 33. Presentity IDs stored in the RAM 33 are acquired one by one (S105). It is determined whether the total data size of the acquired presentity ID is larger than a predetermined value (S107). The predetermined value is determined based on, for example, the maximum data size that can be transferred by a router or server interposed in the network 3. If the total data size is equal to or smaller than the predetermined value (S107: NO), the process returns to S105. Unselected presentity IDs are acquired in order from the RAM 33, and the process is repeated.

  When the total data size of the presentity ID becomes larger than the predetermined value (S107: YES), one presentity ID is removed so that the total data size becomes equal to or smaller than the predetermined value. The removed presentity ID is returned to the RAM 33. The presentity ID adjusted so that the total data size is equal to or smaller than a predetermined value is stored in SUBSCRIBE, and SUBSCRIBE is created (S109). The created SUBSCRIBE is transmitted to the notification device 10 (S111). It is determined whether or not an unselected presentity ID remains in the RAM 33 (S113). If an unselected presentity ID remains in the RAM 33 (S113: YES), the process returns to S105. The process is repeated to store and send the remaining presentity ID in the SUBSCRIBE. On the other hand, when all the presentity IDs stored in the RAM 33 are selected (S113: NO), the process returns to S91.

  In this way, the terminal device 12 divides the presentity ID so that the total data size is equal to or less than a predetermined value, stores it in the SUBSCRIBE, and transmits it to the notification device 10. As a result, it is possible to avoid dividing the SUBSCRIBE by a router, a server, or the like interposed in the network 3. Accordingly, since the processing load on the router or server can be reduced, the SUBSCRIBE is reliably transferred by the router or server and reaches the notification device 10. The terminal device 12 can receive the 200 OK reliably transmitted from the notification device 10 and acquire the state information.

  If the user does not input an instruction in S91 (S91: NO), it is determined whether or not NOTIFY transmitted from the notification device 10 has been received (S93). When NOTIFY is received (S93: YES), one piece of status information stored in NOTIFY is acquired (S95). An image indicating the acquired state information is output from the output unit 36 (S96). The process returns to S91.

  If NOTIFY has not been received in S93 (S93: NO), it is determined whether 200 OK transmitted from the notification device 10 has been received (S97). When 200 OK is received (S97: YES), it is determined whether status information is stored in 200 OK (S99). Since 200 OK stores status information returned from the notification device 10 in response to a SUBSCRIBE storing two or more presentity IDs, it always stores two or more status information. When state information is stored in 200 OK (S99: YES), two or more pieces of state information stored in 200 OK are acquired (S95). An image indicating the acquired state information is output from the output unit 36 (S96), and the process returns to S91. On the other hand, when the status information is not stored in the received 200 OK (S99: NO), the process returns to S91.

  As described above, the terminal device 12 can acquire two or more state information at a time, and can acquire the state information stored in 200 OK, which is a positive response packet. Therefore, it is possible to suppress communication necessary for this purpose and to prevent an increase in traffic on the network 3.

  If 200 OK has not been received in S97 (S97: NO), it is determined whether 481 transmitted from the notification device 10 has been received (S101). If 481 has not been received (S101: NO), the process returns to S91. When 481 is received (S101: YES), the presentity ID stored in 481 is acquired. The acquired presentity ID is deleted from the presentity ID input by the user in S91 and stored in the RAM 33 (S103). The presentity ID remaining in the RAM 33 in this state is the ID of the terminal device 14 with which the notification device 10 can specify the state information. The process proceeds to S105. Presentity IDs stored in the RAM 33 are acquired one by one (S105), and adjusted so that the total data size is a predetermined value or less. The adjusted presentity ID is stored in SUBSCRIBE, and SUBSCRIBE is created (S109). The created SUBSCRIBE is transmitted to the notification device 10 (S111). Note that the presentity IDs stored in the SUBSCRIBE are all IDs that allow the notification device 10 to specify the state information, and thus the terminal device 12 can reliably acquire the state information corresponding to the presentity ID.

  As described above, when there are two or more desired presentities, the terminal device 12 can request status information from the notification device 10 using a common SUBSCRIBE. Further, the terminal device 12 can recognize a plurality of state information stored in 200 OK. As a result, it is possible to suppress communication necessary for acquiring the state information, and thus it is possible to prevent the traffic on the network 3 from increasing.

  In addition, this invention is not limited to the above-mentioned embodiment, A various change is possible. In the above description, when all of the presentity IDs stored in the SUBSCRIBE received by the notification device 10 are not stored in the first table, 481 storing the unstored presentity ID is given to the terminal device 14. I was sending. The present invention is not limited to this. The notification device 10 may extract the presentity ID stored in the first table from the presentity ID stored in the SUBSCRIBE. Then, the corresponding status information may be acquired from the first table, stored in 200 OK, and 200 OK may be transmitted to the terminal device 14 that has transmitted SUBSCRIBE. These processes can be executed by the notification main process in which the processes of S65, S77, and S79 in FIG. 5 are deleted. That is, when a SUBSCRIBE is received (S51: YES) and two or more presentity IDs are stored in the SUBSCRIBE (S63: YES), the two or more presentity IDs are stored in the RAM 23. In S67, among the presentity IDs stored in the RAM 23, a presentity ID whose corresponding state information is stored in the first table is acquired (S67). Then, the presentity ID is adjusted and stored in 200 OK so that the total data size is equal to or less than the predetermined value (S71), and 200 OK is transmitted to the terminal device 14 (S73). As described above, the notification device 10 can acquire only the state information that can be acquired and notify the terminal device 14 when all the state information requested by the SUBSCRIBE cannot be acquired from the first table. Thereby, the terminal device 14 can acquire the state information that can be acquired by the notification device 10 in a short time. The terminal device 14 can suppress the traffic on the network 3 because it does not need communication for re-requesting the status information that can be acquired by the notification device 10.

  In the above-described embodiment, the notification device 10 directly receives the SUBSCRIBE from the terminal device 14 and notifies the terminal device 14 of the corresponding status information. The present invention is not limited to this. A SIP server connected to the network 3 may receive SUBSCRIBE from the terminal device 14. The SIP server may make an inquiry to the notification device 10 in order to obtain state information. The notification device 10 may notify the corresponding status information to the SIP server in response to an inquiry from the SIP server. In the above description, the notification device 10 stores two or more pieces of state information in 200 OK and transmits them to the terminal device 14. For example, two or more pieces of state information are stored in NOTIFY and notified to the terminal device 14. May be.

  The HDD 24 in FIG. 1 that stores the first table corresponds to the “storage unit” of the present invention. The CPU 21 that performs the process of S51 in FIG. 5 corresponds to the “reception unit” of the present invention, the CPU 21 that performs the process of S63 corresponds to the “first determination unit” of the present invention, and the CPU 21 that performs the process of S65 of the present invention. The CPU 21 that performs the process of S67 corresponds to the “first acquisition unit” of the present invention, and the CPU 21 that performs the process of S73 corresponds to the “first transmission unit” of the present invention. The CPU 21 that performs the process of S79 corresponds to the “second transmission unit” of the present invention, the CPU 21 that performs the process of S83 corresponds to the “second acquisition unit” of the present invention, and the CPU 21 that performs the process of S87 of the present invention. Corresponds to “third transmission means”. 5 corresponds to the “reception step” of the present invention, the process of S63 corresponds to the “first determination step” of the present invention, and the process of S65 corresponds to the “second determination step” of the present invention. The process of S67 corresponds to the “first acquisition step” of the present invention, the process of S73 corresponds to the “first transmission step” of the present invention, and the process of S79 corresponds to the “second transmission step” of the present invention. The process of S83 corresponds to the “second acquisition step” of the present invention, and the process of S87 corresponds to the “third transmission step” of the present invention. The CPU 31 that performs the process of S111 in FIG. 6 corresponds to the “terminal transmission unit” of the present invention, and the CPU 31 that performs the process of S97 corresponds to the “terminal reception unit” of the present invention.

DESCRIPTION OF SYMBOLS 1 Communication system 10 Notification apparatus 11, 12, 13, 14 Terminal apparatus 21 CPU
24 HDD
241 First table 242 Second table

Claims (9)

Storage means for storing identification information for identifying a terminal device connected via a network and state information indicating a state of the terminal device and a user of the terminal device in association with each other;
Receiving means for receiving a request packet transmitted from the terminal device and requesting the status information of the other terminal device;
First determination means for determining whether the status information of two or more other terminal devices is requested by the request packet received by the reception means;
When the first determination unit determines that the state information of two or more other terminal devices is requested, all the identification information of the two or more other terminal devices is stored in the storage unit. A second judging means for judging whether or not
Corresponding to the identification information of two or more other terminal devices when the second determination unit determines that all the identification information of the two or more other terminal devices is stored in the storage unit First acquisition means for acquiring two or more status information from the storage means;
Two or more pieces of the status information acquired by the first acquisition unit are stored in a first notification packet, and the first transmission unit transmits the first notification packet to the terminal device that has transmitted the request packet. A notification device characterized by comprising.   When the second determination unit determines that at least one of the identification information of the two or more other terminal devices is not stored in the storage unit, the second determination unit notifies that the state information cannot be acquired. The notification device according to claim 1, further comprising second transmission means for transmitting a second notification packet to the terminal device that has transmitted the request packet. The first transmission means includes
When the data size of the status information stored in the first notification packet becomes larger than a predetermined value, the data size of the status information is divided so as to be equal to or smaller than the predetermined value and stored in the first notification packet. The notification device according to claim 1, wherein the first notification packet is transmitted. The first acquisition means includes
When the second determination means determines that at least one of the identification information of the two or more other terminal devices is not stored in the storage means, the identification information of the two or more terminal devices The notification apparatus according to claim 1, wherein the status information corresponding to the identification information stored in the storage unit is acquired. When the first determination unit determines that the state information of one other terminal device is requested, the one state information corresponding to the identification information of the one other terminal device is obtained. Second acquisition means for acquiring from the storage means;
One state information acquired by the second acquisition unit is stored in a third notification packet, and the third transmission unit transmits the third notification packet to the terminal device that has transmitted the request packet. The notification device according to any one of claims 1 to 4, wherein the notification device. A terminal device connected to a network, and a notification system including a notification device that notifies the terminal device of status information indicating a status of the terminal device and a user of the terminal device,
The notification device includes:
Storage means in which identification information for identifying the terminal device and the state information are stored in association with each other;
First receiving means for receiving a request packet transmitted from the terminal device and requesting the status information of the other terminal device;
First determination means for determining whether the status information of two or more other terminal devices is requested by the request packet received by the first reception means;
When the first determination unit determines that the state information of two or more other terminal devices is requested, all the identification information of the two or more other terminal devices is stored in the storage unit. A second judging means for judging whether or not
Corresponding to the identification information of two or more other terminal devices when the second determination unit determines that all the identification information of the two or more other terminal devices is stored in the storage unit First acquisition means for acquiring two or more status information from the storage means;
Two or more pieces of the status information acquired by the first acquisition unit are stored in a first notification packet, and the first transmission unit transmits the first notification packet to the terminal device that has transmitted the request packet. Prepared,
The terminal device
Terminal transmission means for transmitting the request packet for requesting the status information of one or more other terminal devices to the notification device;
Terminal receiving means for receiving the first notification packet transmitted from the notification device when the request packet requesting the status information of two or more other terminal devices is transmitted by the terminal transmission means; A notification system characterized by comprising. The terminal device that transmits the request packet to the notification device according to claim 1,
Terminal transmission means for transmitting the request packet for requesting the status information of one or more other terminal devices to the notification device;
The first notification packet transmitted from the notification device when the request packet requesting the status information of two or more other terminal devices is transmitted by the terminal transmission unit, the terminal transmission unit A terminal receiving means for receiving the first notification packet storing the state information of two or more other terminal devices requested by the request packet transmitted by the terminal device. Receiving a request packet transmitted from a terminal device connected via a network and requesting the status information indicating the status of the user of the other terminal device and the other terminal device;
A first determination step of determining whether the status information of two or more other terminal devices is requested by the request packet received in the reception step;
When it is determined by the first determination step that the state information of two or more other terminal devices is requested, identification information for identifying the terminal device and the state information are stored in association with each other. A second determination step of referring to the stored storage means and determining whether all of the identification information of the two or more other terminal devices is stored in the storage means;
Corresponding to the identification information of two or more other terminal devices when it is determined by the second determination step that all the identification information of two or more other terminal devices are stored in the storage means A first acquisition step of acquiring the two or more state information to be acquired from the storage means;
Storing two or more pieces of the status information acquired in the first acquisition step in a first notification packet, and transmitting the first notification packet to the terminal device that has transmitted the request packet; A notification method characterized by comprising. A reception step of receiving a request packet for requesting the state information indicating the state of the other terminal device and the user of the terminal device, transmitted from a terminal device connected via a network;
A first determination step of determining whether the status information of two or more other terminal devices is requested by the request packet received in the reception step;
When it is determined by the first determination step that the state information of two or more other terminal devices is requested, identification information for identifying the terminal device and the state information are stored in association with each other. A second determination step of referring to the stored storage means and determining whether all of the identification information of the two or more other terminal devices is stored in the storage means;
Corresponding to the identification information of two or more other terminal devices when it is determined by the second determination step that all the identification information of two or more other terminal devices are stored in the storage means A first acquisition step of acquiring the two or more state information to be acquired from the storage means;
Storing two or more pieces of the status information acquired in the first acquisition step in a first notification packet, and transmitting the first notification packet to the terminal device that has transmitted the request packet; A notification program to be executed by a computer.

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