WO2008025276A1 - Method and system for discovering the access of the call control system - Google Patents

Abstract

A method for discovering the access of the call control system, includes: authentication, authorization and accounting server allocates the access point address of the call control system for terminals, and sends the access point address of the call control system to terminals. Another method for discovering the access of the call control system and two systems for discovering the access of the call control system are also provided. Through authentication, authorization and accounting server or HA allocating the access point address of the call control system for terminals and sending the access point address of the call control system to terminals, the terminals can also obtain the access point address of the call control system without interacting with DHCP server in DHCP process, to achieve that terminals obtain the call access point address and then discover the call access more flexible and to facilitate centralized management of the access point of the call control system due to the unified management and allocation of the access point address of the call control system by AAA server or HA.

Description

 Method and system for discovering call control system entry The present application claims to be filed on August 25, 2006 with the Chinese Patent Office, application number 200610111834.5, and the invention name is "Method and System for Discovering Call Control System Entry"; on December 8, 2006 Submitted to the China Patent Office, the application number is 200610167114.0, and the invention name is "Method and System for Discovering the Entrance of the Call Control System"; submitted to the Chinese Patent Office on January 18, 2007, the application number is 200710006604.7, and the invention name is "Discovery Call Control". The priority of the Chinese Patent Application for the Method and System of the System, the entire contents of which is hereby incorporated by reference.

Technical field

 The present invention relates to the field of call control systems, and more particularly to two methods for discovering the entrance of a call control system and two systems for discovering the entry of a call control system.

Background technique

 The IP Multimedia Subsystem (IMS) is a subsystem of the 3rd Generation Partnership Project (3GPP) proposed in the Release 5 version to support IP multimedia services. Its outstanding feature is the use of the initial session. Session Initiation Protocol (SIP) and independence from access. The framework structure of the IMS defined by 3GPP includes a Call Control Function (CSCF), a Media Gateway Control Function (MGCF), and an IP Multimedia Subsystem Media Gateway (IMS-Media Gateway, IMS-MGW). ), a Multimedia Resource Function Controller (MRFC), a Multimedia Resource Function Processor (MRFP), and a Breakout Gateway Control Function (BGCF). The CSCF is the core of the entire network and supports SIP to process SIP sessions. The P-CSCF is the entry point for the terminal to access the IMS system, and implements the functions of proxy (Proxy) and user agent (User Agent) in SIP. In an IMS system or other call control system, the system portal can also be a SIP proxy. The following takes the call control system as the IMS system and the entry as the P-CSCF as an example.

Figure 1 shows the network architecture in the case where the access network is a WiMAX user roaming situation, where the P-CSCF is the only entry for the calling party terminal to send all SIP messages. Therefore, the terminal must know the address of the P-CSCF before sending the SIP message. In the prior art, the terminal interacts with the DHCP server to obtain the address of the P-CSCF through a Dynamic Host Configuration Protocol (DHCP). The specific process is shown in Figure 2, including the following steps:

 In step 201, the terminal sends a DHCP Discover message to the DHCP relay. In step 202, the DHCP relay forwards the DHCP discovery message to the DHCP server, and then in steps 203 and 204, the DHCP server will P. The address setting of the -CSCF is sent to the DHCP relay in the DHCP response message. The DHCP relay sends the P-CSCF address in the received DHCP response message to the terminal through a DHCP Offer message.

 In WiMAX systems, network access and mobility management of terminals is implemented through both Client Mobile IP (CMIP) and Proxy Mobile IP (PMIP). In the PMIP scenario of the terminal, when the PMIP client performs the relay function, the registration of the mobile IP and the DHCP process are independent, so the terminal can obtain the P-CSCF address through the above-mentioned prior art process; and when the PMIP client exercises In the proxy function, the registration of the mobile IP and the DHCP process are combined, and the DHCP server is not involved, so the P-CSCF address cannot be obtained through the above prior art. Does not include DHCP invention content in CMIP

 The present invention provides two methods for discovering the entrance of a call control system and two systems for discovering the entrance of a call control system, which enables the discovery of the call control system entry to be more flexible.

 In a first aspect, the present invention provides a method for discovering a call control system entry, the method comprising: authenticating an authorized charging AAA server to allocate a call control system entry point address to a terminal; the AAA server will assign a call control system to the terminal The entry point address is sent to the terminal.

 In a second aspect, the present invention provides a system for discovering a call control system entry, the system comprising: a terminal and an AAA server;

 The AAA server allocates a call control system entry point address to the terminal, and sends the call control system entry point address assigned to the terminal to the terminal.

 In a third aspect, the present invention provides a method for discovering a call control system entry, the method comprising: the home agent assigning a call control system entry point address to the terminal;

The home agent sends the call control system entry point address assigned to the terminal to the terminal. In a fourth aspect, the present invention provides a system for discovering a call control system portal, the system comprising: a terminal and a home agent; wherein, the home agent assigns a call control system entry point address to the terminal, and the call control system entry to be allocated for the terminal The point address is sent to the terminal.

 As shown in the foregoing solution, in the present invention, the call control system entry point address is allocated to the terminal by the authentication and authorization accounting server or the home agent, and the call control system entry point address assigned to the terminal is sent to the terminal, so that the terminal does not need to be performed. The DHCP process interacts with the DHCP server to obtain the call control system entry point address, which enables the terminal to more flexibly acquire the address of the call entry point to discover the call entry, and uniformly manages and allocates the call control system entry point due to the AAA server or the home agent. The address makes it easier to centrally manage the entry point of the call control system.

DRAWINGS

 1 is a schematic diagram of a network composition of an access network on which an IMS system is based on a WiMAX network in the prior art;

 2 is a flowchart of acquiring a P-CSCF address by a terminal in the prior art;

 3 is a schematic structural diagram of a system according to a first embodiment of the present invention;

 4 is a flowchart of acquiring a P-CSCF address by a terminal according to the first embodiment of the present invention;

 FIG. 5 is a schematic structural diagram of a system according to a second embodiment of the present invention; FIG.

 6 is a flowchart of acquiring a P-CSCF address by a terminal according to a second embodiment of the present invention;

 7 is a schematic structural view of a system according to a third embodiment of the present invention;

 8 is a flowchart of acquiring a P-CSCF address by a terminal according to a third embodiment of the present invention;

 9 is a schematic structural diagram of a system according to a fourth embodiment of the present invention;

 10 is a flowchart of acquiring a P-CSCF address by a terminal according to a fourth embodiment of the present invention;

 11 is a schematic structural diagram of a system according to a fifth embodiment of the present invention;

 FIG. 12 is a flowchart of acquiring a P-CSCF address by a terminal according to a fifth embodiment of the present invention;

 13 is a schematic structural diagram of a system according to a sixth embodiment of the present invention;

 14 is a flowchart of acquiring a P-CSCF address by a terminal according to a sixth embodiment of the present invention;

 15 is a schematic structural diagram of a system according to a seventh embodiment of the present invention;

 FIG. 16 is a flowchart of a terminal acquiring a P-CSCF address according to a seventh embodiment of the present invention.

 17 is a schematic structural diagram of a system according to an eighth embodiment of the present invention;

FIG. 18 is a flowchart of a terminal acquiring a P-CSCF address according to an eighth embodiment of the present invention. detailed description

 In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described in detail with reference to the accompanying drawings.

 In the present invention, the call control system entry point address is assigned to the terminal by the AAA server or the HA, and the call control system entry point address is assigned to the terminal and sent to the terminal.

 In the present invention, the AAA server or the HA may directly send the call control system entry point address configured in the same to the terminal, or may send the call control system entry point address configured in itself to other network elements, and then other network elements. The call is sent to the terminal; or the terminal requests the initiation of the request, and the AAA server, the HA, or other network element sends the call control system entry point address to the terminal. In this way, the terminal obtains the call control system entry point address, which makes the discovery of the call control system entry more flexible, facilitates centralized control, and is applicable to a network that does not use the DHCP mechanism to obtain an IP address.

 The above call control system entry point can be either a P-CSCF or a SIP proxy (SIP PROXY). The following takes the call control system entry point as the P-CSCF as an example.

 The present invention can be applied to a variety of different application scenarios. The present invention is further described in detail below as a specific embodiment in several different scenarios of a WiMAX system.

 The present invention is applied to the terminal in the PMIP scenario and the terminal obtains the P-CSCF address through the DHCP process as the first embodiment of the present invention. In this embodiment, in the process of the Extensible Authentication Protocol (EAP) authentication, the AAA server sends the address of the P-CSCF configured in itself to the authenticator (Authenticator), and then the PMIP client comes from the authenticator in the DHCP process. The P-CSCF address of the AAA server is sent to the terminal.

The system based on this embodiment is shown in FIG. 3, and includes a terminal, a DHCP entity, an authenticator, and an AAA server. The DHCP entity here may be a DHCP proxy or a DHCP relay, and is hereinafter referred to as a DHCP proxy/relay. The terminal is configured to initiate an EAP authentication process to the AAA server by using the authenticator, and after the EAP authentication is completed, request the DHCP proxy/relay to obtain the P-CSCF address through the DHCP process; the DHCP proxy/relay is used according to the request of the terminal. Obtaining the P-CSCF address from the authenticator and sending it to the terminal; the authenticator is used to interact with the AAA server to authenticate the terminal, and obtain the P-CSCF address from the AAA server; the AAA server is used to authenticate the terminal, and according to itself The configured P-CSCF address information is used to assign a P-CSCF to the user, and the assigned P-CSCF address is sent to the authenticator. In the roaming scenario, the system based on this embodiment includes a home AAA (H-AAA) server and a visited AAA (V-AAA) server, and according to the protocol between operators, if the P-CSCF address is allocated by the home network, The P-CSCF is allocated to the user by the H-AAA server according to the P-CSCF address information configured in the H-AAA server, and the assigned P-CSCF address is sent to the authenticator through the V-AAA server; if the P-CSCF is allocated by the visited network For the address, the V-AAA server allocates the P-CSCF to the user according to the P-CSCF address information configured in the V-AAA server, and delivers the assigned P-CSCF address to the authenticator.

 For example, in the roaming scenario, the process of the terminal discovering the P-CSCF address in this embodiment is as shown in FIG. 4, and includes the following steps:

 Step 401 to step 402: In the EAP authentication process, the terminal sends an EAP authentication message to the authenticator, and the authenticator sends an EAP authentication request to the H-AAA server of the terminal through the V-AAA server according to the EAP authentication message from the terminal.

 Step 403: The H-AAA server authenticates the terminal, and sends the authentication related parameter to the authenticator through the V-AAA server. Here, according to the inter-operator agreement, if the P-CSCF is allocated by the home network, the H-AAA server allocates the P-CSCF to the user according to the P-CSCF address information configured in the UE, and passes the assigned P-CSCF address. The V-AAA server sends the certificate to the Authenticator. If the P-CSCF address is assigned by the visited network, the V-AAA server allocates the P-CSCF to the user according to the P-CSCF address information configured in the network, and when the authentication-related parameters are forwarded. The P-CSCF address assigned by the V-AAA server to the user is sent to the authenticator.

 Step 404: After the EAP authentication succeeds, the Authenticator sends an EAP authentication success message to the terminal. Step 405: In the DHCP process, the terminal sets a P-CSCF address request indication in the request message sent to the DHCP proxy/relay to request to obtain the P-CSCF address information. The request message here may be a DHCP discovery message in the DHCP discovery process or a DHCP request message in the DHCP request process.

Step 406: After receiving the request message including the P-CSCF address request indication, the DHCP proxy/relay sends the P-CSCF address obtained by the authenticator to the terminal through the corresponding response message. Here, if the request message in step 405 is a DHCP discovery message, the response message here is a DHCP providing message; if the request message in step 405 is a DHCP request (Request) message, then the response message here is a DHCP response (Ack) Message. In this embodiment, the request message sent by the terminal to the DHCP proxy/relay in the DHCP process may not carry the P-CSCF address request indication, and the DHCP proxy/relay directly provides the message through the DHCP or the DHCP response message. The obtained P-CSCF address is sent to the terminal.

 In this embodiment, the content included in the EAP message carrying the P-CSCF address between the H-AAA, the V-AAA, and the access network is as shown in Table 1. As can be seen from Table 1, in this embodiment, The EAP message adds the last two items based on the existing EAP message: P-CSCF and DNS, where P-CSCF is the IP address list or domain name address list of the P-CSCF sent to the authenticator, and DNS is used in P- When the address in the CSCF entry is the domain name address, the IP address of the DNS is provided for parsing the domain name address of the P-CSCF to obtain an IP address.

 Table 1

In the above-mentioned first embodiment, the AAA server sends the P-CSCF address configured in the AAA server to the authenticator through the EAP authentication process, and the terminal obtains the P-CSCF address through the DHCP process. In the second embodiment of the present invention, the AAA server still configures itself in the EAP authentication process. The P-CSCF address is sent to the authenticator, but thereafter the P-CSCF address is sent to the terminal through a broadcast message. FIG. 5 is a schematic diagram of a system composition based on the embodiment, wherein adding an access network gateway based on the system shown in FIG. 3 does not include a DHCP proxy/relay. The added access network gateway is configured to construct a route broadcast message according to the information in the authenticator, and add the P-CSCF address information acquired by the authenticator from the AAA server in the route broadcast message; the terminal, in addition to performing the EAP authentication process, The P-CSCF address information is obtained in the broadcast message sent by the access network gateway; the interaction performed by the authenticator with other entities is the same as in the first embodiment. The access network gateway here may be an external proxy in IPv4 or an access router in IPv6, and the corresponding route broadcast message is an external proxy broadcast message or a route advertisement message.

 In this embodiment, the extended option cell in Table 2 is added to the route broadcast message, where the Option type field can occupy 8 bit space; the Option length field can occupy 8 bit space, and is used for Identifies the length of the P-CSCF address field; the P-CSCF Address field can occupy 128 bytes of space.

 Option type Option length P-CSCF Address

 Table 2

 The flow of this embodiment is as shown in FIG. 6. The steps 601 to 604 included in the EAP authentication process are the same as the steps 401 to 404 in FIG. 4. In step 605, the access network gateway construct includes a P-CSCF address. After the broadcast message is routed and broadcasted, the terminal can obtain the P-CSCF address by receiving the broadcast message.

 The present invention is applied to the terminal to allocate and deliver the P-CSCF address to the terminal by the AAA server in the CMIP scenario, which is the third embodiment of the present invention. In this embodiment, the AAA server sends the P-CSCF address configured in itself to the terminal through the home agent in the mobile IP request process.

The system on which the embodiment is based is shown in FIG. 7, and includes a terminal, a home agent, and an AAA server. The terminal is configured to send a mobile IP registration request carrying a P-CSCF address request indication to the home agent, and receive a mobile IP registration response message carrying the P-CSCF address from the home agent to obtain a P-CSCF address; the home agent is used to receive a MIP registration request from the terminal, and a request for user authentication is sent to the AAA server, and the P-CSCF address delivered by the AAA server through the authentication response is sent to the terminal through the MIP registration response message; the AAA server is configured to receive the proxy from the home agent. The user authentication request authenticates the user and passes the P-CSCF address configured in the user. The certificate response is sent to the home agent.

 In the roaming scenario, the system of this embodiment further includes a foreign agent to which the terminal is connected, and the foreign agent is used to forward the request and response message between the terminal and the home agent.

 For example, in the roaming scenario, the process for the terminal to discover the P-CSCF address in this embodiment is as shown in FIG. 8, and includes the following steps:

 Step 801: The foreign agent advertises to the terminal by using a MIP advertisement (Adv) message, so that the terminal obtains the address (CoA) of the foreign agent.

 Step 802: The terminal sends a MIP registration request to the foreign agent, where the request carries the network identifier NAI, the home agent address (HoA), the CoA, and the P-CSCF address request indication information.

 Step 803: The foreign agent initiates a MIP registration request to the home agent, and the message carries the network identifier NAI, HoA, CoA, and P-CSCF address request indication information carried in the MIP registration request message in step 802.

 Step 804: After receiving the MIP registration request, the home agent sends an AAA authentication request to the AAA server, requesting the AAA server to authenticate the user and request relevant information. The request may include a P-CSCF address request indication.

 Step 805: After receiving the MIP registration request from the home agent, the AAA server returns an AAA authentication response message to the home agent, where the message includes the P-CSCF address configured in the AAA server itself.

 Step 806: The home agent responds to the mobile IP registration message initiated by the foreign agent, and includes the allocated P-CSCF address in the MIP registration response message.

 Step 807: The foreign agent returns a MIP response message to the MIP registration request initiated by the terminal, where the message includes the P-CSCF address allocated by the AAA server.

In this embodiment, in the MIP registration request message mentioned in step 802 and step 803, one cell (IE) may be added separately as a P-CSCF address request indication, and the terminal is required to obtain the P-CSCF address. The added cell format can be as shown in Table 3, where the type (Type) value indicates the P-CSCF address request, the data (data) field is empty, and the length (length) field is used to indicate the size of the space occupied by the data field. Then, in the MIP registration response message mentioned in step 806 to step 807, the cell is correspondingly added to carry the P-CSCF address message, and the added cell has the same structure as that of the table 3, wherein the Type value and the corresponding request message are Like the Type value, the data field is the IP of the assigned P-CSCF. The address list, or the domain name list (domain name list) and the IP address of the DNS.

 table 3

 In this embodiment, the extension of the AAA request message and the AAA response message may be the same as in the first embodiment, and the P-CSCF attribute is added based on the existing EAP message, or the DNS attribute is further increased.

 The present invention is applied to the terminal to allocate and deliver the P-CSCF address by the HA in the terminal CMIP scenario, which is the fourth embodiment of the present invention. In this embodiment, the HA of the terminal sends the P-CSCF address configured in the terminal to the terminal in the mobile IP request procedure.

 The system on which the embodiment is based is shown in FIG. 9, and includes a terminal and a home agent. The terminal is configured to send a mobile IP registration request carrying a P-CSCF address request indication to the home agent, and receive a mobile IP registration response message carrying the P-CSCF address from the home agent to obtain a P-CSCF address; the home agent is used to receive The MIP registration request from the terminal is based on the P-CSCF address configured in the terminal, and the P-CSCF address allocated for the terminal is sent to the terminal through the MIP registration response message.

 In the roaming scenario, the system of this embodiment further includes a foreign agent to which the terminal is connected, and the foreign agent is used to forward the request and response message between the terminal and the home agent.

 For example, in the roaming scenario, the process of the terminal discovering the P-CSCF address in this embodiment is as shown in FIG. 10, where steps 1001 to 1003 are the same as steps 801 to 803 in FIG. 8, in step 1004, hometown. After receiving the MIP registration request, the proxy allocates a P-CSCF address to the terminal according to the P-CSCF address configured in the UE, and sends the P-CSCF address allocated for the terminal to the foreign agent through the MIP registration response message, in step 1005, the field The proxy returns a MIP response message for the MIP registration request initiated by the terminal, where the message includes the P-CSCF address allocated by the terminal for the terminal.

 In this embodiment, the format of the MIP registration request message and the MIP response message may be the same as in the third embodiment.

 The invention is applied to the terminal in the PMIP scenario and the terminal is combined in the same process.

The DHCP procedure and the mobile IP registration process acquire the P-CSCF address assigned by the AAA server to the fifth embodiment of the present invention. In this embodiment, the AAA server sends the P-CSCF address configured in itself to the terminal through the home agent through the mobile IP request process combined with the DHCP process. The system on which the embodiment is based is as shown in FIG. 11, and includes a terminal, a DHCP proxy, a PMIP client, a home agent, and an AAA server. The terminal is configured to send a DHCP discovery request that carries the P-CSCF address request indication information to the DHCP proxy, and receive a DHCP offer message that carries the P-CSCF address information returned by the DHCP proxy. The DHCP proxy is configured to trigger according to the DHCP discovery request of the terminal. The PMIP client sends a mobile IP registration request carrying the P-CSCF address request indication to the home agent, and sends the P-CSCF address provided by the PMIP client to the terminal through the DHCP provision message; the PMIP client is configured to send the carrier P to the home agent. - the CSCF address request indication mobile IP registration request, and receiving a mobile IP registration response message carrying the P-CSCF address from the home agent, and providing the P-CSCF address therein to the DHCP proxy; the home agent is for receiving from the PMIP The client's MIP registration request, and initiates a request for user authentication to the AAA server, and sends the P-CSCF address delivered by the AAA server through the authentication response to the PMIP client through the MIP response; the AAA server is configured to receive the pair from the home agent. User authentication request authenticates the user and authenticates the P-CSCF address configured in the user. The response is sent to the home agent.

 In the roaming scenario, the system in this embodiment further includes a foreign agent connected to the terminal, and the foreign agent is used to forward the request and response message between the PMIP client and the home agent.

 As shown in Figure 12, the process of discovering the P-CSCF address in the terminal in this embodiment includes the following steps:

 Step 1201: The terminal sends a DHCP discovery message with the P-CSCF indication information to the DHCP proxy.

 Step 1202: The DHCP proxy triggers the PMIP client to perform mobile IP registration, and sends a mobile IP registration request to the foreign agent, where the request includes the P-CSCF address request indication information.

 Step 1203: The foreign agent initiates a mobile IP registration request to the home agent, including the P-CSCF address request indication information.

 Step 1204: The home agent requests the AAA server to authenticate the user and request to obtain related information, where the authentication request may include P-CSCF address request indication information.

 Step 1205: After receiving the authentication request from the home agent, the AAA server authenticates the user, and returns an authentication response message to the home agent, where the message includes a P-CSCF address assigned to the user.

Step 1206: The home agent responds to the mobile IP registration message initiated by the foreign agent, and sends the agent to the foreign agent. The sent MIP registration response message contains the P-CSCF address allocated by the AAA server.

 Step 1207: The foreign agent responds to the MIP registration request initiated by the PMIP client, and the MIP registration response message sent to the PMIP client includes the P-CSCF address allocated by the AAA server.

 Step 1208: The PMIP client triggers the DHCP proxy to send a DHCP providing message to the terminal, where the AAA server includes the P-CSCF address allocated by the AAA server.

 In this embodiment, the DHCP discovery message and the DHCP providing message may not include the DHCP-related information, and the PMIP client may carry the P-CSCF address request indication information in the MIP registration request to obtain the P- assigned by the AAA server to the terminal. CSCF address. The terminal may send the P-CSCF address request indication through the DHCP request message, and the DHCP proxy sends the P-CSCF address allocated by the AAA server to the terminal to the terminal through the DHCP response message.

 In addition, the P-CSCF address request indication information may not be included in each of the foregoing request messages, and the AAA server actively passes the P-CSCF address allocated to the user through the home agent and other networks in the system after authenticating the user. The yuan is sent to the terminal.

 The invention is applied to the terminal in the PMIP scenario and the terminal is combined in the same process.

In the DHCP procedure and the mobile IP registration process, obtaining the HA to assign the P-CSCF address to it is the sixth embodiment of the present invention. In this embodiment, the HA sends the P-CSCF address configured in itself to the terminal through the home agent through the mobile IP request process combined with the DHCP process.

The system on which the embodiment is based is shown in FIG. 13, and includes a terminal, a DHCP proxy, a PMIP client, and a home agent. The terminal is configured to send a DHCP discovery request that carries the P-CSCF address request indication information to the DHCP proxy, and receive a DHCP offer message that carries the P-CSCF address information returned by the DHCP proxy. The DHCP proxy is configured to trigger according to the DHCP discovery request of the terminal. The PMIP client sends a mobile IP registration request carrying the P-CSCF address request indication to the home agent, and sends the P-CSCF address provided by the PMIP client to the terminal through the DHCP provision message; the PMIP client is configured to send the carrier P to the home agent. - the CSCF address request indication mobile IP registration request, and receiving a mobile IP registration response message carrying the P-CSCF address from the home agent, and providing the P-CSCF address therein to the DHCP proxy; the home agent is for receiving from the PMIP The MIP registration request of the client, and the P-CSCF address is allocated to the terminal according to the P-CSCF address configured in the UE, and the P-CSCF address allocated for the terminal is sent to the PMIP client through the MIP response. In the roaming scenario, the system in this embodiment further includes a foreign agent connected to the terminal, and the foreign agent is used to forward the request and response message between the PMIP client and the home agent.

 For example, in the roaming scenario, the process of the terminal discovering the P-CSCF address in this embodiment is as shown in FIG. 14, where steps 1401 to 1403 are the same as steps 1201 to 1203 in FIG. 12, and in step 1404, the hometown is used. The proxy allocates a P-CSCF address to the terminal according to the P-CSCF address configured in the UE, and sends the P-CSCF address allocated for the terminal to the foreign agent through the MIP registration response message. In step 1405, the foreign agent responds to the MIP registration request initiated by the PMIP client, and sends a MIP registration response message to the PMIP client, where the response message includes the P-CSCF address allocated by the terminal for the terminal, and then in step 1406, the PMIP The client triggers the DHCP proxy to send a DHCP providing message to the terminal, which includes the P-CSCF address allocated by the HA for the terminal.

 In this embodiment, the DHCP discovery message and the DHCP providing message may not include the DHCP related information, and the PMIP client may carry the P-CSCF address request indication information in the MIP registration request to obtain the P-CSCF allocated by the HA for the terminal. address. The terminal can send the P-CSCF address request indication through the DHCP request message, and the DHCP proxy sends the P-CSCF address allocated by the user to the terminal through the DHCP response message.

 In addition, the P-CSCF address request indication information may not be included in each of the foregoing request messages, and the HA actively sends the P-CSCF address allocated for the terminal to the terminal through a foreign agent or other network element in the MIP registration response message.

In the present invention, the AAA server may also allocate a P-CSCF address to the user in the initial authentication process, and send the assigned address to the terminal through the access router in the access network gateway. As shown in FIG. 15, the system composition diagram based on the seventh embodiment of the present invention includes: a terminal (MN), an access network gateway, and an H-AAA server. The terminal is configured to perform initial access authentication with the access network gateway, and after completing the initial access authentication, send a request for obtaining information to the access network gateway, and receive the P-CSCF address information returned by the access network gateway. The obtaining information is responsive to obtain the P-CSCF address; the access network gateway is configured to interact with the terminal to perform initial access authentication, send an access request to the H-AAA, and receive the access that carries the P-CSCF address returned by the H-AAA server. Receiving a message, storing information such as a P-CSCF address in the access accepting message, and requesting the information including the P-CSCF address to be sent to the terminal through the obtaining information response message according to the obtaining information request of the terminal; H-AAA service The device is configured to receive an access request from an access network gateway, allocate related information including a P-CSCF address to the user according to the request, and send the allocated information to the access network gateway by using an access accept message. The access network gateway includes an access router, where the access network gateway interacts with the terminal to obtain an information request and obtain an information response message, and the access router interacts with the terminal.

 As shown in FIG. 16, the process of the terminal discovering the P-CSCF address in the embodiment includes the following steps: Step 1601: The terminal interacts with the access network gateway to perform initial access authentication (Authen Access- Auth).

 Step 1602: The access network gateway sends an access request (Access Request) to the H-AAA, requesting to allocate related information.

 Step 1603: The H-AAA access request allocates corresponding HA, HL, and the like, and allocates the information to the terminal.

P-CSCF address information.

 Step 1604: The H-AAA sends the information such as the HA, HL, and P-CSCF addresses allocated by the user to the access network gateway by using an Access Accept message.

 Step 1605: The access network gateway stores information such as the received HA, HL, and P-CSCF addresses. Step 1606: The access network gateway interacts with the terminal to complete initial access authentication.

 Step 1607: The terminal sends an information request (Information Request) to the access router on the access network gateway, and requests to obtain related information.

 Step 1608: The access router sends the P-CSCF address information and other related information stored in the access network gateway to the terminal by using an information reply (Information Reply) message.

 In the present invention, the AAA server may also allocate a P-CSCF address to the user in the initial authentication process, and receive the home address agent in the mobile IP registration process initiated by the mobile terminal through the external proxy in the access network gateway. After the returned mobile IP registration is corresponding, and the corresponding P-CSCF address of the obtained or pre-configured terminal is sent to the mobile terminal before being sent to the mobile terminal. As shown in FIG. 17, the system composition diagram based on the eighth embodiment of the present invention includes:

(MN), access network gateway and H-AAA server. The terminal is configured to perform initial access authentication with the access network gateway, and after completing the initial access authentication, send a request for obtaining information to the access network gateway, and receive the P-CSCF address information returned by the access network gateway. Acquiring the information to obtain the P-CSCF address; the access network gateway is used to interact with the terminal for initial access authentication, and sends the H-AAA to the H-AAA. Sending an access request, and receiving an access accept message carrying a P-CSCF address returned by the H-AAA server, storing information such as a P-CSCF address in the access accept message, and including P- according to the request information of the terminal The information of the CSCF address is sent to the terminal by acquiring the information response message; the H-AAA server is configured to receive an access request from the access network gateway, and allocate relevant information including the P-CSCF address to the user according to the request, and allocate the information. The information is sent to the access network gateway through the access accept message. The access network gateway includes an access router, where the access network gateway interacts with the terminal to obtain an information request and obtain an information response message, and the access router interacts with the terminal.

 The process of the terminal discovering the P-CSCF address in the embodiment is as follows: Step 1801: The external proxy obtains its P-CSCF through AAA through pre-configuration or during the initial authentication process of the mobile terminal. After the address, the foreign agent advertises to the terminal through the MIP advertisement (Adv) message, so that the terminal obtains the address (CoA) of the foreign agent.

 Step 1802: The terminal sends a MIP registration request to the external agent, where the request carries a network identifier NAI, a home agent address (HoA), and a CoA.

 Step 1803: The foreign agent sends a MIP registration request to the home agent, and the message carries the network identifiers NAI, Ho A, CoA carried in the MIP registration request message in step 802.

 Step 1804: After receiving the MIP registration request, the home agent sends an AAA authentication request to the AAA server, requesting the AAA server to authenticate the user and request relevant information.

 Step 1805: After receiving the MIP registration request from the home agent, the AAA server returns an AAA authentication response message to the home agent.

 Step 1806: The home agent responds to the mobile IP registration message initiated by the foreign agent.

 Step 1807: The foreign agent returns a MIP response message to the MIP registration request initiated by the terminal, where the message includes the P-CSCF address allocated by the AAA server.

In this embodiment, in the MIP registration request message mentioned in step 802 and step 803, one cell (IE) may be added separately as a P-CSCF address request indication, and the terminal is required to obtain the P-CSCF address. The added cell format can be as shown in Table 3, where the type (Type) value indicates the P-CSCF address request, the data (data) field is empty, and the length (length) field is used to indicate the size of the space occupied by the data field. Then, in the MIP registration response message mentioned in step 806 to step 807, the cell is correspondingly added to carry the P-CSCF address message, and the added cell has the same structure as that of the table 3, wherein the Type value and the corresponding request message are Like the Type value, the data field is the IP of the assigned P-CSCF. The address list, or the domain name list (domain name list) and the IP address of the DNS.

 In this embodiment, the extension of the AAA request message and the AAA response message may be the same as in the first embodiment, and the P-CSCF attribute is added based on the existing EAP message, or the DNS attribute is further increased.

 It is to be understood that the embodiments of the present invention may also be embodied in the form of a computer readable medium, which may be a medium containing, storing, communicating, transmitting or transmitting a computer program. A program for operating a system device, system or device provided by an embodiment of the present invention, or a program related to the instruction. The computer readable medium can be an electronic, magnetic, electromagnetic, optical, infrared, or semiconductor system, apparatus, device, propagation medium, or computer memory.

 The above is a description of specific embodiments of the present invention, and the method of the present invention may be appropriately modified in a specific implementation process to suit the specific needs of the specific situation. Therefore, it is to be understood that the specific embodiments of the present invention are not intended to limit the scope of the invention.

Claims

Rights request  A method for discovering an entry of a call control system, comprising:  Authentication Authorization Accounting The AAA server assigns a call control system entry point address to the terminal; the AAA server sends the call control system entry point address assigned to the terminal to the terminal.  2. The method according to claim 1, wherein the call control system entry point address is pre-configured in the AAA server, and the call control system entry is allocated to the terminal according to the call control system entry point address configured in the AAA server. Point address.  The method according to claim 1, wherein the AAA server sends the call control system entry point address assigned to the terminal to the terminal, including:  The AAA server sends the call control system entry point address assigned to the terminal to the terminal through the intermediate network element.  The method according to claim 3, wherein the AAA server inputs the call control system entry point allocated to the terminal according to the call control system entry point address request indication included in the message from the intermediate network element. The address is sent to the terminal.  The method according to claim 3, wherein the AAA server sends the call control system entry point address assigned to the terminal to the terminal by the intermediate network element, including:  In the EAP authentication process of the extensible authentication protocol, the AAA server allocates a call control system entry point address to the terminal, and sends the call control system entry point address assigned to the terminal to the authenticator; and the authenticator is in the same physical entity. The dynamic host configuration protocol DHCP entity sends the call control system entry point address from the AAA server to the terminal.  The method according to claim 5, wherein the AAA server is a home AAA server of the terminal, or is a visited AAA server of the terminal.  The method according to claim 5, wherein the DHCP entity sends the call control system entry point address from the AAA server to the terminal according to the request of the terminal. The method according to claim 7, wherein the terminal requests the acquirer to obtain a call control system entry point address through a DHCP discovery message, or a DHCP request message; The message, or DHCP response message, sends the call control system entry point address of the terminal to the terminal. The method according to claim 3, wherein the AAA server sends the call control system entry point address assigned to the terminal to the terminal by the intermediate network element, including:  In the EAP authentication process, the AAA server allocates a call control system entry point address to the terminal, and sends the call control system entry point address assigned to the terminal to the authenticator;  The access network gateway obtains the call control system entry point address of the terminal received by the authenticator, and delivers the call control system entry point address to the terminal by using a broadcast message.  10. The method according to claim 9, wherein the broadcast message is: an external proxy broadcast message sent by an external proxy, or a route advertisement message broadcast by an access router.  The method according to claim 3, wherein the terminal uses the client mobile internet protocol CMIP, and the AAA server sends the call control system entry point address assigned to the terminal to the terminal through the intermediate network element. The terminal includes:  During the mobile IP registration process, the AAA server allocates a call control system entry point address to the terminal, and sends the call control system entry point address assigned to the terminal to the home agent of the terminal;  The home agent of the terminal sends the call control system entry point address to the terminal through the mobile IP registration response message.  The method according to claim 3, wherein the terminal uses a proxy mobile internet protocol PMIP, and the AAA server sends the call control system entry point address assigned to the terminal to the terminal through the intermediate network element. The terminal includes:  In the mobile IP registration process, the AAA server allocates a call control system entry point address to the terminal, and sends the call control system entry point address assigned to the terminal to the PMIP client of the terminal through the terminal's home agent;  The DHCP proxy agent in the same physical entity as the PMIP client sends the call control system entry point address to the terminal through the DHCP provisioning message.  The method according to claim 3, wherein the AAA server sends the call control system entry point address assigned to the terminal to the terminal by the intermediate network element, including:  In the initial access authentication process, the AAA server allocates a call control system entry point address to the terminal, and sends the call control system entry point address allocated to the terminal to the access network gateway;  The access network gateway sends the received call control system entry point address to the terminal. 14. The method according to claim 13, wherein the access network gateway will receive The call control system entry point address is sent to the terminal, and the access router on the access network gateway sends a response message to the call control system, and the call control system entry point address received by the access network gateway is sent to the terminal. .  The method according to claim 3, wherein the terminal uses the client mobile internet protocol CMIP, and the AAA server sends the call control system entry point address assigned to the terminal to the terminal through the intermediate network element. The terminal includes:  In the mobile IP registration process, the AAA server allocates a call control system entry point address to the terminal, and sends the call control system entry point address assigned to the terminal to the authenticator or the access gateway or the external agent in the access network;  The authenticator or the access gateway or the external proxy sends the call control system entry point address to the terminal through the mobile IP registration response message.  The method according to any one of claims 1 to 15, wherein the call control system is an IP multimedia subsystem; the call control system entry point is: a proxy call control function entity P-CSCF or an initial Session Protocol SIP Proxy.  The method according to any one of claims 1 to 15, wherein the call control system entry point address is: a list of IP addresses of the call entry point, or: a domain name list and address of the call entry point Resolve the IP address of the server DNS.  A system for discovering a call control system entry, comprising: a terminal and an AAA server; wherein the AAA server is configured to allocate a call control system entry point address to the terminal, and the call control system to be allocated to the terminal The entry point address is sent to the terminal.  The system according to claim 18, further comprising: an intermediate network element; wherein the AAA server sends the call control system entry point address assigned to the terminal to the terminal through the intermediate network element ; or  The AAA server sends a call control system entry point address assigned to the terminal to the terminal through the intermediate network element according to the request from the intermediate network element to carry the call control system entry point address request indication. The system according to claim 19, wherein the intermediate network element comprises: an authenticator and a DHCP entity; or comprising: an authenticator and an access network gateway; or comprising: a home agent; or comprising: a home agent , PMIP client and DHCP proxy; or include: access network gateway; Or include: an authenticator and an external agent; or include an external agent.  The system according to any one of claims 18 to 20, wherein the call control system is an IP multimedia subsystem.  22. A method for discovering an entry of a call control system, the method comprising:  The home agent assigns a call control system entry point address to the terminal;  The home agent sends the call control system entry point address assigned to the terminal to the terminal. The method according to claim 22, wherein the home agent is pre-configured with a call control system entry point address, and the home agent allocates a call to the terminal according to a pre-configured call control system entry point address in the home agent. Control system entry point address.  The method according to claim 22, wherein the terminal uses CMIP, and in the mobile IP registration process, the home agent according to the call control system entry point address carried in the mobile IP registration request message from the terminal The request indication is to assign a call control system entry point address to the terminal, and the call control system entry point address assigned to the terminal is sent to the terminal by using the mobile IP registration response message.  The method according to claim 22, wherein the terminal uses PMIP, and in the mobile IP registration process, the home agent according to the call control system entry point carried in the mobile IP registration request message from the PMIP client The address request indication is that the terminal is assigned a call control system entry point address, and the call control system entry point address assigned to the terminal is sent to the PMIP client of the terminal by using a mobile IP registration response message;  Then, the DHCP proxy agent in the same physical entity as the PMIP client sends the call control system entry point address to the terminal through the DHCP provisioning message.  A system for discovering a call control system entry, comprising: a terminal and a home agent; wherein the home agent is configured to allocate a call control system entry point address to the terminal, and the call control system to be allocated to the terminal The entry point address is sent to the terminal.  27. The system of claim 26, further comprising: a PMIP client, and a DHCP proxy located in the same physical entity as the PMIP client; And the home agent sends a call control system entry point address to the terminal according to the call control system entry point address request indication carried in the mobile IP registration request message from the PMIP client, and the call control system entry point address assigned to the terminal is passed. Mobile IP registration response message is sent to the end Terminal PMIP client;  The DHCP proxy sends the call control system entry point address received by the PMIP client to the terminal through a DHCP provisioning message.