JP2010045562A - Communication device and mobile communication system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce the number of signals to be transmitted/received in establishing a session between mobile units, and to further promptly establish the session. <P>SOLUTION: A GGSN 10 for establishing a session between a transmission terminal 40a and a reception terminal 40b on a mobile communication network N includes: a reception part 11 receiving a session establishment request including a phone number of the reception terminal 40b from the transmission terminal 40a; an IP address setting part 12 setting an IP address for the transmission terminal 40a based on the session establishment request, and setting an IP address for the reception terminal 40b based on the phone number of the reception terminal 40b; a session establishment part 13 establishing a session between the transmission terminal 40a and the reception terminal 40b; and an announcement part 14 announcing the establishment of the session along with the IP addresses set for the transmission terminal 40a and the reception terminal 40b to the transmission terminal 40a and the reception terminal 40b. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a communication device for establishing a session between mobile devices on a mobile communication network, and a mobile communication system including the communication device.

As described in Patent Document 1, a technique for establishing a session using IP (Internet Protocol) between wireless terminals using a protocol such as SIP (Session Initiation Protocol) is known. In Patent Document 1, the session is efficiently established using the IP address of the receiving terminal held by the transmitting terminal.
JP 2004-128793 A

  However, when a session is established between mobile devices via a mobile communication network, there is an application form in which an IP address is issued (set) to each mobile device when the session is established. In the form, as described in Patent Document 1, the terminal cannot hold the IP address of the counterpart terminal in advance.

  When a session via the mobile communication network is established by SIP, the mobile communication network and each mobile device perform the following processing. First, the mobile communication network receives a session establishment request from the calling terminal, issues an IP address to the calling terminal, and notifies it. Subsequently, the mobile communication network receives information specifying the receiving terminal such as a telephone number as INVITE from the calling terminal. The mobile communication network issues an incoming call notification to the receiving terminal based on the information. When there is a response from the receiving terminal to the incoming call notification, the mobile communication network issues an IP address to the receiving terminal and notifies it. Thereafter, the mobile communication network establishes a session between the transmitting terminal and the receiving terminal, and notifies the transmitting terminal and the receiving terminal when the session is established.

  Conventionally, session establishment processing as described above has been performed, but in order to reduce the amount of communication on the mobile communication network from the viewpoint of network cost, the number of signals transmitted and received in the establishment of a session between mobile devices is increased. It is required to reduce it. Moreover, it is required to establish a session earlier from the viewpoint of usability.

  The present invention has been made in view of the above, and provides a communication device and a mobile communication system capable of reducing the number of signals transmitted and received in establishing a session between mobile devices and establishing a session earlier. The purpose is to provide.

  In order to achieve the above object, a communication apparatus according to the present invention is a communication apparatus for establishing a session between a first mobile station and a second mobile station on a mobile communication network. Receiving means for receiving a session establishment request including information identifying the second mobile equipment from the mobile equipment of the mobile station, and setting an IP address for the first mobile equipment based on the session establishment request received by the receiving means And an IP address setting means for setting an IP address for the second mobile device based on information identifying the second mobile device included in the session establishment request, and an IP address is set by the IP address setting means. Session establishment means for establishing a session between the first and second mobile devices to be set, the fact that the session has been established by the session establishment means, and the IP address setting procedure First and fit the set IP address for the second mobile by, characterized in that it comprises a notifying means for notifying the first and the second mobile, the.

  In order to achieve the above object, a mobile communication system according to the present invention includes a mobile device that is established on a mobile communication network and performs communication using a session with another mobile device, and the mobile device. A mobile communication system including a communication device for establishing a session between a first mobile device and a second mobile device on a mobile communication network, wherein the mobile device is a target of establishment of another session. Receiving means for transmitting a session establishment request including information identifying a second mobile device from a first mobile device. And an IP address for the first mobile station based on the session establishment request received by the receiving means and the information identifying the second mobile station included in the session establishment request. IP address setting means for setting an IP address for the second mobile device, and session establishment means for establishing a session between the first and second mobile devices for which the IP address is set by the IP address setting means Together with the fact that the session has been established by the session establishing means and the IP addresses set for the first and second mobile devices by the IP address setting means, and notifies the first and second mobile devices. And a notification means.

  In the communication apparatus according to the present invention, setting of IP addresses to the originating mobile device (first mobile device) and the terminating mobile device (second mobile device) for establishing a session This is performed based on the session establishment request of the mobile station on the calling side. In addition, the mobile station is notified of the IP address and the establishment of the session. Thus, according to the present invention, it is possible to reduce the number of signals transmitted and received in establishing a session between mobile devices and establish a session earlier.

  In the communication apparatus according to the present invention, setting of IP addresses to the originating mobile device (first mobile device) and the terminating mobile device (second mobile device) for establishing a session This is performed based on the session establishment request of the mobile station on the calling side. In addition, the mobile station is notified of the IP address and the establishment of the session. Thus, according to the present invention, it is possible to reduce the number of signals transmitted and received in establishing a session between mobile devices and establish a session earlier.

  Hereinafter, preferred embodiments of a communication device and a mobile communication system according to the present invention will be described in detail with reference to the drawings. In the description of the drawings, the same elements are denoted by the same reference numerals, and redundant description is omitted.

  FIG. 1 shows a configuration of a mobile communication system 1 according to the present embodiment. In the mobile communication system 1, data communication by GPRS (General Packet Radio Service) is performed. The mobile communication system 1 includes a GGSN (Gateway GPRS Support Node) 10 that is a communication device according to the present embodiment. The GGSN 10 is included in the mobile communication network N. The mobile communication network N includes a plurality of SGSN (Service GPRS Support Node) 20 (SGSN 20a, 20b) and an HLR (Home Location Register) 30 as components. The mobile communication system 1 is also configured to include a mobile device 40 (mobile devices 40a and 40b) connected to the mobile communication network N and performing mobile communication. The mobile device 40 performs peer-to-peer communication using a session with another mobile device 40 established on the mobile communication network N.

  The GGSN 10 is a node having a gateway function with another data communication network such as the Internet in the mobile communication network N. Normally, a plurality of GGSNs 10 are included in the mobile communication network N, but only one is shown in the present embodiment. The GGSN 10 is connected to the SGSNs 20a and 20b and the HLR 30, and can send and receive information to and from these devices. The GGSN 10 establishes a session between the two mobile devices 40 by the following function. As shown in FIG. 1, the GGSN 10 includes a reception unit 11, an IP address setting unit 12, a session establishment unit 13, and a notification unit 14.

  The receiving unit 11 is a receiving unit that receives a session establishment request from the mobile device 40. The session establishment request is a request for establishing a session between two mobile devices 40 for performing peer-to-peer communication. The session establishment request includes information for specifying the partner mobile device 40 to which the session is established. The receiving unit 11 can also identify the mobile device 40 that has transmitted the session establishment request from the session establishment request. The mobile device 40a that has transmitted the session establishment request that triggers the session establishment processing is referred to as a transmitting terminal 40a (first mobile device), and the counterpart mobile device 40b that is specified by the information included in the session establishment request is referred to as the incoming terminal 40b This is called (second mobile device). A telephone number is used as information for specifying the transmitting terminal 40a and the receiving terminal 40b, but other information may be used.

  When receiving the session establishment request, the receiving unit 11 outputs information to that effect and information specifying the transmitting terminal 40a and the receiving terminal 40b to the IP address setting unit 12 in order to perform session establishment processing.

  Note that, in the GGSN 10, when the telephone number of the receiving terminal 40b is included in the session establishment request, the session establishment process is performed by the function of the present invention, and the telephone number of the receiving terminal 40b is not included in the session establishment request. In this case, the conventional session establishment process by SIP can be performed. The conventional session establishment processing by SIP is a node such as a CSCF (Call Session Control Function) on the mobile communication network N using the IP address issued from the GGSN 10 in response to the session establishment request by the calling terminal 40a. This process is performed by sending INVITE to the terminal. In that case, the receiving unit 11 determines whether or not the session establishment request includes the telephone number of the partner mobile device 40b to which the session is established. When the telephone number of the partner mobile device 40b is included in the session establishment request, the receiving unit 11 performs the processing according to the present invention, and when the telephone number of the partner mobile device 40 is not included in the session establishment request, Processing similar to the conventional one is performed, such as paying out an IP address to the terminal 40a.

  The receiving unit 11 confirms the location of the receiving terminal 40b and notifies the receiving terminal 40b of the incoming call before outputting each information to the IP address setting unit 12. Specifically, it is performed as follows. The receiving unit 11 issues a location inquiry request for the receiving terminal 40b to the HLR 30 based on the telephone number of the receiving terminal 40b included in the session establishment request from the transmitting terminal 40a. The receiving unit 11 receives a location inquiry response corresponding to the location inquiry request from the HLR 30. The area inquiry response includes information (for example, an identifier provided in advance in the SGSN 20) that identifies the SGSN 20b in which the incoming terminal 40b is in the area. It is assumed that the SGSN 20a is the SGSN 20 where the calling terminal 40a is located, and the SGSN 20b is the SGSN 20 where the called terminal 40b is located. The receiving unit 11 performs the following processing when the receiving terminal 40b is in the mobile communication network N.

  The receiving unit 11 notifies the incoming terminal 40b of incoming calls via the SGSN 20b where the incoming terminal 40b is located. The reception unit 11 includes information (for example, an identifier provided in the GGSN 10 in advance) that identifies the device 10 as a response destination (connection destination) in the incoming notification. When a session establishment request is transmitted from the receiving terminal 40b as a response to the incoming call notification, the receiving unit 11 receives the session establishment request. Upon receiving the session establishment request from the receiving terminal 40b, the receiving unit 11 outputs each information to the IP address setting unit 12.

  When the IP address setting unit 12 is notified from the receiving unit 11 that the session establishment request has been received, based on the telephone numbers of the transmitting terminal 40a and the receiving terminal 40b simultaneously input from the receiving unit 11, the IP address setting unit 12 IP address setting means for setting an IP address for the receiving terminal 40b. Each IP address setting process itself is performed in the same manner as in the prior art. As described above, the IP address is set to the incoming terminal 40b after the incoming terminal 40b is notified of the incoming call and the session establishment request is received from the incoming terminal 40b.

  Setting of the IP address to the transmission terminal 40a and the reception terminal 40b is performed at the same timing. Note that it may not be performed at exactly the same timing, and may be performed at substantially the same timing. For example, the IP address may be set to the receiving terminal 40b after the IP address is set to the calling terminal 40a. In addition, even if the timing is not necessarily the same, it is only necessary to set the IP address for the transmission terminal 40a and the reception terminal 40b before the session is established. The IP address setting unit 12 notifies the session establishment unit 13 that the session establishment request has been received from both the transmission terminal 40a and the reception terminal 40b, and notifies the IP address notification unit 14 of the set IP address.

  The session establishment unit 13 is a session establishment unit that establishes a session between the transmission terminal 40a and the reception terminal 40b for which an IP address is set by the IP address setting unit 12. The session establishment unit 13 determines that the session establishment request has been received from both the transmission terminal 40a and the reception terminal 40b based on the information input from the IP address setting unit 12, and performs a session establishment process. The session establishment process itself is performed in the same manner as before using the telephone numbers of the transmission terminal 40a and the reception terminal 40b. The session establishing unit 13 acquires a telephone number and the like necessary for establishing a session from a session establishment request received by the receiving unit 11 as necessary. When the session establishment unit 13 establishes a session, the session establishment unit 13 notifies the notification unit 14 to that effect.

  When the session establishment unit 13 is notified that the session has been established, the notification unit 14 is a notification unit that notifies the transmission terminal 40a and the reception terminal 40b by transmitting a session establishment response to that effect. The session establishment response includes the IP addresses of the transmitting terminal 40a and the receiving terminal 40b assigned by the IP address setting unit 12. Note that the IP address is not necessarily included in the session establishment response, and may be notified together with the fact that the session has been established.

  Transmission / reception of information according to the present invention, such as transmission / reception of a session establishment request and session establishment response, is performed between the SGSN 20 and the mobile device 40 according to a protocol such as GTP (GPRS Tunneling Protocol) between the GGSN 10 and the SGSN 20. Each is performed according to a protocol such as (Session Management). That is, transmission / reception of information in this embodiment is performed according to a protocol in a low layer. The above is the function according to the present embodiment of the GGSN 10.

  Next, FIG. 2 shows a hardware configuration of the GGSN 10 according to the present embodiment. As shown in FIG. 2, the GGSN 10 includes a CPU (Central Processing Unit) 101, a RAM (Random Access Memory) 102 and a ROM (Read Only Memory) 103, which are main storage devices, a communication module 104 for performing communication, and a hard disk It is comprised as a computer provided with hardware, such as auxiliary storage devices 105. When these components operate, each function of the GGSN 10 is exhibited.

  The SGSN 20 is a node that performs location management, security management, and access control of the mobile device 40. A mobile device 40 whose location is managed by the SGSN 20 is referred to as a mobile device 40 located in the SGSN 20. The SGSN 20 transmits / receives information to / from the mobile device 40 via a base station or the like. Each SGSN 20 is connected to a predetermined GGSN 10 corresponding to the configuration of the mobile communication network N, and can send and receive information to and from the GGSN 10. That is, the SGSN 20 relays information between the GGSN 10 and the mobile device 40.

  Specifically, the SSGN 20 receives the session establishment request transmitted from the mobile device 40 and transmits it to the GGSN 10. When the information for specifying the GGSN 10 as the transfer destination is included in the session establishment request, the SSGN 20 selects the GGSN 10 based on the information and transmits a session establishment request to the selected GGSN 10. Further, the SSGN 20 relays an incoming call notification transmitted from the GGSN 10 to the incoming terminal 40b.

  The HLR 30 is a device (database) that manages user information such as a telephone number and an identification number of the mobile device 40. The HLR 30 holds the location of the mobile device 40 based on the location registration from the mobile device 40 and information on the SGSN 20. When the GGSN 10 makes a location inquiry request relating to the incoming terminal 40b, the HLR 30 transmits to the GGSN 10 a location inquiry response including information indicating which SGSN 20 the incoming terminal 40b is in.

  The mobile device 40 is a terminal having a mobile communication function as described above, and is used by being carried by a user. Specifically, the mobile device 40 corresponds to, for example, a mobile phone. The mobile device 40 may be a combination of a mobile phone and a device such as a personal computer connected to the mobile phone. As shown in FIG. 1, the mobile device 40 includes a transmission / reception unit 41 and a peer-to-peer communication unit 42. In addition to the above-described components, the mobile device 40 also has a function of performing mobile communication (for example, a function of performing location registration with respect to the mobile communication network N).

  The transmission / reception unit 41 is means for transmitting / receiving information to / from the mobile communication network N. Information transmitted / received includes control signals and information related to peer-to-peer communication. More specifically, the transmission / reception unit 41 is a transmission unit that transmits a session establishment request to the GGSN 10. When the mobile device 40 becomes the transmission terminal 40a, the transmission of the session establishment request is performed using an operation on the mobile device 40 by the user as a trigger. In addition, the session establishment request can include the telephone number of the communication partner with which the session is established. The telephone number may be selected from telephone numbers stored in advance in a telephone directory or the like provided in the mobile device 40 when an operation for transmitting a session establishment request is performed by the user. It may be entered.

  In addition, when the mobile device 40 becomes the receiving terminal 40b, the transmission / reception unit 41 receives an incoming notification from the mobile communication network N, notifies the user that there is an incoming call by means of a ring tone, display, etc. Accept responses to incoming calls. The notification to the user that there is an incoming call is preferably made in addition to information on which outgoing call terminal 40a receives the incoming call, as in the case of a normal incoming call. If the input from the user indicates a response permitting the incoming call, a session establishment request is transmitted to the mobile communication network N. In addition, when the information for specifying the GGSN is included in the incoming notification as described above, the transmission / reception unit 41 includes the information for specifying the GGSN 10 in the session establishment response to be transmitted.

  Further, the transmission / reception unit 41 receives a session establishment response transmitted from the mobile communication network N (GGSN 10). The transmission / reception unit 41 notifies the peer-to-peer communication unit 42 that the session establishment response has been received and the IP addresses of the transmission terminal 40a and the reception terminal 40b included in the session establishment response.

  When notified that the session establishment response has been received from the transmission / reception unit 41, the peer-to-peer communication unit 42 performs peer-to-peer communication with the mobile device 40 of the communication partner using the notified IP address. Specifically, packets having the IP addresses of the transmission source and the transmission destination (source IP address and destination IP address) of the own device 40 and the communication device mobile device 40 as the communication device mobile device 40 are connected. Send and receive between. Note that transmission / reception of information to / from the mobile communication network N is performed via the transmission / reception unit 41. The above is the function of the mobile device 40 according to this embodiment.

  Next, FIG. 3 shows a hardware configuration of the mobile device 40 according to the present embodiment. As illustrated in FIG. 3, the mobile device 40 includes hardware such as a CPU 401, a RAM 402, a ROM 403, an operation unit 404, a wireless communication unit 405, a display 406, and an antenna 407. In addition, the mobile device 40 has constituent elements (not shown) such as a voice processing unit, a speaker, and a microphone for functioning as a mobile phone. These components are connected so that various signals can be input and output via a bus. The functions described above are exhibited by the operation of these components.

  Subsequently, processing executed in the mobile communication system 1 of the present embodiment will be described using the sequence of FIG. In this process, a session establishment request for performing peer-to-peer communication with the receiving terminal 40b is made from the calling terminal 40a to the mobile communication network N, and a session is established between the calling terminal 40a and the receiving terminal 40b. Is established until peer-to-peer communication is performed.

  First, a session establishment request is transmitted to the mobile communication network N from the transmission / reception unit 41 of the transmission terminal 40a using a user operation as a trigger. This session establishment request requests peer-to-peer communication with the receiving terminal 40b, and includes the telephone number b of the receiving terminal. The transmitted session establishment request is received by the receiving unit 11 of the GGSN 10 via the SGSN 20a where the calling terminal 40a is located (S01). Note that when the calling terminal 40a requests communication with the receiving terminal 40b by SIP or the like, the telephone number of the receiving terminal 40b is not included in the session establishment request.

  Subsequently, in the GGSN 10, the receiving unit 11 determines whether or not the session establishment request includes the telephone number of the receiving terminal 40b (S02). As described above, this determination is a determination as to whether or not the calling terminal 40a is requesting peer-to-peer communication by the processing according to the present invention.

  If it is determined that the telephone number of the receiving terminal 40b is included in the session establishment request, the receiving unit 11 then makes a location inquiry request regarding the receiving terminal 40b to the HLR 30 (S03). In the location inquiry request, the telephone number b of the receiving terminal 40b included in the session establishment request is included as information for specifying the mobile device 40 to be inquired.

  In the HLR 30, the location inquiry request is received, and based on the telephone number b of the receiving terminal 40b included in the request, the SGSN stored in the own device 30 and in which the receiving terminal 40b is located is specified. Information # 2 is acquired. The SGSN information # 2 is included in the location inquiry response to the location inquiry request and transmitted from the HLR 30 to the GGSN 10 (S04).

  In the GGSN 10, the location inquiry response is received by the receiving unit 11. Subsequently, the receiving unit 11 sends an incoming call notification to the receiving terminal 40b via the SGSN 20b specified by the information # 2 included in the response (S05, S06). The incoming notification includes information # 1 that identifies the own device 10 (GGSN 10) as a transmission target of the session establishment response from the incoming terminal 40b.

  In the incoming terminal 40b, the incoming / outgoing notice is received by the transmission / reception unit 41. When the incoming notification is received, the user is notified that there is an incoming call. Subsequently, the transmission / reception unit 41 accepts an input of a response permitting an incoming call from the user to the receiving terminal 40b (S07). When the input of the response is accepted, a session establishment request is transmitted from the transmitting / receiving unit 41 of the receiving terminal 40b to the mobile communication network N (S08). The session establishment request includes information # 1 that identifies the GGSN 10 that is the transmission target of the session establishment response included in the incoming call notification.

  Subsequently, in the mobile communication network N, the transmitted session establishment response is received by the SGSN 20b. The SGSN 20b selects the GGSN 10 that is the transmission target of the session establishment response from the information # 1 included in the session establishment request (S09). Subsequently, a session establishment request from the receiving terminal 40b is transmitted from the SGSN 20b to the selected GGSN 10 (S10).

  Subsequently, in the GGSN 10, the transmitted session establishment request is received by the reception unit 11. The fact that the session establishment request has been received by the receiving unit 11 and the information received by the receiving unit 11 are output to the IP address setting unit 12. Subsequently, based on the information input from the receiving unit 11, the IP address setting unit 12 sets IP addresses A and B for the transmitting terminal 40a and the receiving terminal 40b, respectively (S11). The set IP addresses A and B are output from the IP address setting unit 12 to the IP address notification unit 14. The IP address is set, and information indicating that the session establishment request has been received from both the transmission terminal 40 a and the reception terminal 40 b is output from the IP address setting unit 12 to the session establishment unit 13.

  Subsequently, based on the information input from the IP address setting unit 12, the session establishment unit 13 establishes a session between the transmission terminal 40a and the reception terminal 40b (S12). When the session is established, the notification is sent from the session establishing unit 13 to the notification unit 14.

  When the session establishment unit 13 notifies the notification unit 14 that a session has been established, and when the assigned IP address is notified from the IP address setting unit 12 to the notification unit 14, the notification unit 14 has the same timing or sequentially. A session establishment response is transmitted from the sender terminal 40a and the receiver terminal 40b (S13, S14). The session establishment response transmitted to each of the mobile devices 40a and 40b includes the IP address A set for the calling terminal 40a and the IP address B set for the receiving terminal 40b.

  Subsequently, in each of the mobile devices 40a and 40b, the transmission / reception unit 41 receives a session establishment response. The peer-to-peer communication unit 42 is notified that the session establishment response has been received and the IP addresses A and B of the originating terminal 40a and the terminating terminal 40b included in the session establishment response. As described above, when the session establishment response is received, the transmission terminal 40a and the reception terminal 40b can perform peer-to-peer communication using the established session. For example, a packet by peer-to-peer communication is transmitted from the calling terminal 40a to the receiving terminal 40b (S15). Here, the source and destination IP addresses set in the packet are IP addresses A and B set in the transmitting terminal 40a and the receiving terminal 40b, respectively.

  As described above, in the present embodiment, setting of IP addresses to the transmission terminal 40a and the reception terminal 40b for establishing a session is performed based on a session establishment request of the transmission terminal 40a. In addition, an IP address and a session establishment notification are sent to the transmitting terminal 40a and the receiving terminal 40b. Thereby, according to this embodiment, it is possible to reduce the number of signals transmitted and received in establishing a session between mobile devices 40, which is performed by dynamically setting an IP address, and to establish a session earlier. .

  According to the SIP method, the GPRS communication path (GPRS session) with the GGSN is established between the calling-side mobile device and the mobile communication network, and between the receiving-side mobile device and the mobile communication network. Transmission / reception of information between them requires 1 round trip and 1.5 round trips (0.5 round trips are notifications of incoming calls). In addition, one round trip is required for both the sending side and the receiving side for IMS registration. In addition, one round trip is required for both the sending side and the receiving side for INVITE (call connection at the IMS level). As described above, according to the SIP method, it is necessary to transmit and receive 3 round trip and 3.5 round trip information on both the calling side and the called side before communication using a session can be performed between mobile devices. become. Furthermore, according to the SIP system, the CSCF needs to be involved in communication management. Further, as described above, in the conventional method such as SIP, the IP address is set at the same timing to the mobile device on the transmission side and the mobile device on the reception side as in the present embodiment, and is also notified. It is not done.

  On the other hand, in the method according to the present embodiment, as described above, communication between the mobile devices 40a and 40b can be performed between the calling terminal 40a and the mobile communication network N, and the receiving terminal 40b. And the mobile communication network N can be transmitted and received only once and 1.5 round trips (0.5 round trips are notifications of incoming calls). By reducing the number of information (number of signals) that travels back and forth in the wireless section in this way, the connection time can be greatly shortened.

  In the present embodiment, the GPRS session and the route through which user data on the session flow are the same, and there is no useless route. As a result, when a failure occurs on the route of the GPRS session, there is a high possibility that communication of user data will be disturbed, and the monitoring efficiency is high.

  Further, as in the present embodiment, the GGSN 10 determines the session establishment request parameter, and performs peer-to-peer communication processing only when the communication partner's telephone number is set. It is preferable to perform a session establishment procedure for connecting to (). This makes it possible to control the establishment of the peer-to-peer communication according to the present invention with a slight process change to the conventional GGSN, and it is not necessary to change the system such as the CSCF.

  In addition, as in the present embodiment, it is preferable to set information for specifying a GGSN to be connected at the time of session establishment in the signal of the incoming notification to the incoming terminal 40b. Thereby, it becomes possible to select the GGSN 10 of the optimum route from the serving SGSN 20b at the time of session establishment from the receiving terminal 40b. In addition, since the user data path and the GPRS session path are the same, it becomes easy to monitor the failure of the path.

  Further, as in the present embodiment, it is preferable to perform the IP address setting transition processing in the GGSN 10 after receiving a session establishment request from the receiving terminal 40b. Thereby, useless processing can be reduced and efficient processing becomes possible.

It is a figure which shows the structure of the mobile communication system containing GGSN which is a communication apparatus which concerns on embodiment of this invention, and the said GGSN. It is a figure which shows the hardware constitutions of GGSN which concerns on embodiment of this invention. It is a figure which shows the hardware constitutions of the mobile apparatus which concerns on embodiment of this invention. It is a sequence diagram which shows the process performed with the mobile communication system which concerns on embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Mobile communication system, 10 ... GGSN, 11 ... Reception part, 12 ... IP address setting part, 13 ... Session establishment part, 14 ... Notification part, 20 ... SGSN, 30 ... HLR, 40 ... Mobile station (40a ... Originating terminal 40b ... incoming terminal), 41 ... transmission / reception unit,
DESCRIPTION OF SYMBOLS 41 Transmission / reception part, 42 ... Peer to peer communication part, 101 ... CPU, 102 ... RAM, 103 ... ROM, 104 ... Communication module, 105 ... Auxiliary storage device, 401 ... CPU, 402 ... RAM, 403 ... ROM, 404 ... Operation part, 405 ... Wireless communication unit, 406 ... Display, 407 ... Antenna, N ... Mobile communication network.

Claims (2)

A communication device for establishing a session between a first mobile device and a second mobile device on a mobile communication network,
Receiving means for receiving a session establishment request including information identifying the second mobile device from the first mobile device;
An IP address is set for the first mobile device based on the session establishment request received by the receiving means, and the second mobile device included in the session establishment request is specified based on information identifying the second mobile device. IP address setting means for setting an IP address for the second mobile device;
Session establishment means for establishing a session between the first and second mobile devices, whose IP addresses are set by the IP address setting means;
The first and second are determined by combining the fact that the session has been established by the session establishing means and the IP addresses set for the first and second mobile devices by the IP address setting means. A notification means for notifying the mobile device;
A communication device comprising: A mobile device that communicates using a session with another mobile device established on the mobile communication network, and a first mobile device and a second mobile device on the mobile communication network. A mobile communication system including a communication device for establishing a session between,
The mobile device includes a transmission unit that transmits a session establishment request including information identifying a mobile device to be established for the other session to the communication device,
The communication device
Receiving means for receiving a session establishment request including information identifying the second mobile device from the first mobile device;
An IP address is set for the first mobile device based on the session establishment request received by the receiving means, and the second mobile device included in the session establishment request is specified based on information identifying the second mobile device. IP address setting means for setting an IP address for the second mobile device;
Session establishment means for establishing a session between the first and second mobile devices, whose IP addresses are set by the IP address setting means;
The first and second are determined by combining the fact that the session has been established by the session establishing means and the IP addresses set for the first and second mobile devices by the IP address setting means. A notification means for notifying the mobile device;
A mobile communication system comprising:

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