CN1708167A - Method for processing local service in mobile network IP multimedia sub-system - Google Patents

Abstract

The invention discloses a method for processing local services in a mobile network IP multimedia subsystem. Information; when the user terminal initiates an IP Multimedia Subsystem service request, identify whether the service request is a local service according to the recorded IP Multimedia Subsystem local service information of the access network; identify the initial session protocol INVITE message in the service request according to the identification result The REQUEST URI parameter. Utilizing the present invention, when a roaming user terminal initiates an IP multimedia subsystem service, it can judge and recognize a local service identified by a non-globally routable public service identifier and indicate it in the service request, so that the IP multimedia subsystem can Local services are identified and processed correctly, enabling network operators to provide roaming users with rich local services.

Description

Method of Handling Local Service in Mobile Network IP Multimedia Subsystem

technical field

The invention relates to the technical field of communication, in particular to a method for processing local services in a mobile network.

Background technique

With the development of communication technology, people are no longer satisfied with a single voice communication method, but need a new multimedia communication method. This multimedia communication is not only simple video and audio communication, but also includes instant messaging, same-site browsing, collaborative Work, streaming media and other services, especially services that integrate new communication methods and traditional voice. Based on the trend of Internet (Internet) and telecommunication network integration, the IP Multimedia Subsystem (IMS) of the all-IP (Internet Protocol) service network architecture is introduced on the basis of the mobile packet network to handle the increasing IP multimedia services and control the entire network. call flow.

The IP multimedia service is based on the session control capability defined by the IETF (Internet Engineering Task Force), and is realized by using the PS domain and multimedia bearer. Like the CS (Circuit Switching) domain and PS (Packet Switching) domain subsystem, the IP multimedia subsystem can complete functions such as call initiation, hold, and release, and also perform conversion control on multimedia streams and provide support for multimedia services. Contains several different functional entities.

The main functional entities in IMS are CSCF (Call Control Entity) and HSS (Home Subscriber Server). Depending on the location of the CSCF in the network, the roles it undertakes are also different. There are three types: P-CSCF (proxy CSCF), I-CSCF (query CSCF), and S-CSCF (serving CSCF).

The P-CSCF is the first contact point of the UE (User Equipment) in the IMS network, and completes the Proxy (proxy) function. The user equipment obtains the address of the P-CSCF through a "local CSCF discovery procedure". P-CSCF accepts SIP (Initial Session Protocol message), and processes or forwards the received request and service. The P-CSCF does not modify the requested URI in the SIP INVITE message.

The I-CSCF mainly considers the network security and completes the network hiding function. When the user registers, the I-CSCF queries the HSS and determines the S-CSCF serving the user. The I-CSCF can act as a connection point for all users in the network, and can also be used as a service access point for roaming users in the current network service area. There can be multiple I-CSCFs in a network.

S-CSCF executes the session control function, records the user's call status, and completes the call control function. It is the most important service control entity. Different S-CSCFs can complete different business functions due to the different ASs (application servers) they are connected to.

HSS records the user information of each IMS user (user number, address information; security information for authentication and authorization; supports user registration, records location information between different systems; user characteristic data) and business data (service trigger rules and business trigger logic), and cooperate with CSCF to complete the most important routing functions and roaming functions, while HSS provides authentication, authorization, IMSI (International Mobile Subscriber Identity)/IP address mapping, location positioning functions, etc.

From the perspective of IMS mobility, when a user roams out of the home network, all services of the user are routed to the home network by the P-CSCF of the visited location, and the S-CSCF of the home network maps the services to the local or a third party (the third party can be a network or just a single application server). The key point of this model is that the S-CSCF of the home network controls the user services. No matter whether the user is roaming or not, what kind of equipment and access network, the user is only controlled by the home network to ensure the consistency and simplicity of the service. The network architecture is shown in Figure 1.

In the existing mobile network specification, the same IMS local service access mechanism is provided for the home user and the visiting user. IMS local services are identified by a globally routable PSI (Public Service Identity) and routed according to normal IMS routing. However, in some cases, the local service identifier is not globally routable. If the local numbering plan is used, the following methods will be used to access the local service:

(1) The home network determines whether the roaming user requests an IMS local service or an address using a local numbering plan according to the instruction received from the user terminal UE, and the instruction is included in the REQUEST URI of the SIP INVITE message initiated by the UE;

(2) The P-CSCF routes the service request to the S-CSCF of the home network;

(3) The S-CSCF forwards the session to the application server AS of the home network according to the local instructions received from the UE and certain filtering rules, and the AS processes the SIP URI, such as address analysis and modification (translated into a globally routable address format PSI), the AS may need to identify the access network where the user is located from SIP signaling or through the HSS;

(4) The AS returns the session request to the S-CSCF, and the S-CSCF routes it through the normal IMS routing mode to reach the destination, such as accessing the server corresponding to the PSI in the network.

In the prior art, if the IMS local service is not identified by a globally routable public service identifier PSI, such as using a local numbering plan, then the UE needs to recognize that this is a local service when initiating the IMS local service, and send it to the SIP INVITE The REQUEST URI parameter in the message contains an indication that enables the home network to recognize whether the roaming user is requesting an IMS local service or an address using the local numbering plan. However, there is currently no effective and uniform method for how a user terminal determines whether a certain service is an IMS local service.

Contents of the invention

The purpose of the present invention is to provide a method for processing local services in the IP multimedia subsystem of a mobile network, so that when a roaming user terminal initiates an IMS service, it can identify the service identified by a non-globally routable PSI (Public Service Identity). local business.

The technical scheme provided by the invention is as follows:

A method for processing local services in a mobile network IP multimedia subsystem, comprising:

A. After the user terminal roams out of the home network, it first accesses the current access network to register with the IP multimedia subsystem;

B. The user terminal obtains and records the local service information of the IP multimedia subsystem of the currently visited network;

C. When the user terminal initiates an IP Multimedia Subsystem service request, identify whether the service request is a local service according to the recorded IP Multimedia Subsystem local service information of the currently accessed network;

D. Identify the REQUEST URI parameter in the initial session protocol INVITE message of the service request according to the identification result.

In the step B, the user terminal obtains the local service information of the IP multimedia subsystem of the currently accessed network through the following steps:

After receiving the registration of the IP multimedia subsystem of the user terminal, the currently visited network actively delivers the local service information of the IP multimedia subsystem to the user terminal.

In the step B, the user terminal obtains the local service information of the IP multimedia subsystem of the currently visited network and also realizes through the following steps:

The user terminal obtains and records the local service information of the IP multimedia subsystem of the currently accessed network

The user terminal requests local service information from the currently visited network;

The currently visited network sends IP multimedia subsystem local service information to the user terminal according to the request of the user terminal.

In the step B, the user terminal obtains the local service information of the IP multimedia subsystem of the currently visited network and also realizes through the following steps:

After receiving the registration of the IP multimedia subsystem of the user terminal, the home network issues the local service information of the IP multimedia subsystem of the currently visited network.

In the step B, the user terminal obtains the local service information of the IP multimedia subsystem of the currently visited network and also realizes through the following steps:

The user terminal requests the home network for local service information of the currently visited network;

The home network delivers the IP multimedia subsystem local service information of the currently visited network to the user terminal.

The IP multimedia subsystem local service information includes: local service address related information, and the identifier of the currently visited network.

Described step C specifically comprises:

C1. The user terminal initiates an IP multimedia subsystem service request;

C2. Query the recorded local service information of the IP multimedia subsystem currently visiting the network according to the address of the service request;

C3. When the address of the service request is located in the recorded local service information of the IP multimedia subsystem of the currently visited network, the service request is a local service.

The method also includes:

When the user terminal leaves the currently visited network, delete the recorded IP multimedia subsystem local service information of the currently visited network in a predetermined manner.

The reservation methods include:

Immediately delete the recorded IP Multimedia Subsystem local service information of the currently visited network; or delete the recorded IP Multimedia Subsystem local service information of the currently visited network after waiting for a predetermined time.

It can be seen from the above technical solution provided by the present invention that the present invention automatically judges and identifies the IMS local service by the roaming user terminal without the active intervention of the user, so that the roaming user can automatically identify the non-globally routable PSI (Public Service Identifier) identifies the local service, so that the network operator can combine the existing local service provision mode in the mobile network specification to provide rich local service for roaming users.

Description of drawings

FIG. 1 is a schematic diagram of a network framework for providing IMS services when a user roams in the prior art;

Fig. 2 is a flow chart of the inventive method;

Fig. 3 is a schematic diagram of an IMS local service processing flow in the present invention.

Detailed ways

The core of the present invention is that when the user terminal roams out of the home network, accesses a certain visiting network for the first time and initiates IMS (IP Multimedia Subsystem) registration, obtains the IMS local service information of the visiting network, and the user terminal records and saves The IMS local service information of the access network, when the user terminal initiates a service request, according to the saved IMS local service information, mainly address-related information, it is judged whether the current service is a local service, and when the service request SIP (Initial Session Protocol) INVITE The local service may or may not be indicated in the REQUEST URI parameter of the message. When the user terminal leaves a certain access network, it can delete the local service information of the access network saved in the terminal immediately, or delete after waiting for a period of time.

In order to enable those skilled in the art to better understand the solution of the present invention, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

With reference to Fig. 2, Fig. 2 has shown the flow process of the method for processing local business in the mobile network IP multimedia subsystem of the present invention, comprises the following steps:

Step 201: After roaming to a new network, the user terminal performs IMS registration after accessing the currently visited network for the first time.

Step 202: the user terminal acquires and records the IMS local service information of the currently accessed network. The user terminal can obtain the IMS local service information of the currently accessed network in the following ways:

(1) The currently visited network actively sends the IMS local service information to the user terminal. For example, the visited network places all local service information on a WEB server. After receiving the IMS registration signal from the user terminal, the currently visited network notifies the WEB server to send all the local service information to the user terminal.

(2) The user terminal requests the local service information from the currently visited network, for example, the user actively obtains the IMS local service information from the server by visiting a certain server of the visited network.

(3) The home network of the user terminal sends the IMS local service information of the currently visited network to the user terminal. After the current home network receives the IMS registration of the user terminal, the home network delivers the IMS local service information of the network currently visited by the user terminal.

(4) The user terminal requests the home network for the local service information of the currently visited network; for example, the user actively obtains the IMS local service information of the currently visited network from the server by accessing a certain server of the home network.

The IMS local service information includes: local service address-related information, and may also include an identifier of the visited network. For example, China Mobile Network provides the following local business information:

IP phone service 17951;

Called toll service 800;

Card number business 200;

Step 203: the user terminal initiates an IMS service request.

Step 204: Query the recorded IMS local service information of the currently visited network according to the address of the initiated IMS service request;

Step 205: Judging whether the address of the IMS service request is located in the recorded IMS local service information of the currently visited network.

If it exists, it shows that the service is a local service. At this time, proceed to step 206: indicate the local service in the REQUEST URI parameter of the service request SIP INVITE message.

Then, go to step 208: carry out local normal business processing, with reference to Fig. 3, mainly comprise the following process:

(1) The P-CSCF of the visited network routes the service request to the S-CSCF of the home network;

(2) The S-CSCF forwards the session to the application server AS of the home network according to the local service instructions received from the UE and certain filtering rules, and the AS processes the SIP URI, such as address analysis and modification (translated into globally routable Address format PSI), the AS may need to identify the access network where the user is located from SIP signaling or through the HSS;

(3) The AS returns the session request to the S-CSCF, and the S-CSCF routes it through the normal IMS routing mode to reach the destination, such as accessing the server corresponding to the PSI in the network.

If it does not exist, it shows that the service is not a local service. At this time, proceed to step 207, and do not indicate the local service in the REQUEST URI parameter of the service request SIP INVITE message.

Then, go to step 209: perform non-local normal business processing, mainly including the following processes:

(1) The P-CSCF of the visited network routes the service request to the S-CSCF of the home network;

(2) According to the non-local service indication received from the UE, the S-CSCF performs routing through the normal IMS routing mode to reach the destination.

In the above process, when the user terminal sends a service request, it needs to indicate whether the service request is a local service in the REQUEST URI parameter of the service request SIP INVITE message. Those skilled in the art know that the INVITE message is used to initiate a call request. INVITE message includes message header and data area. The INVITE message header contains address information of the caller and called party, call subject and call priority, etc.; the data area is the information about the session media, which can be realized by the session description protocol SDP, and is mainly used to describe the media processing capability of the terminal. Wherein, the URI parameter is used to indicate whether it is a local service request. For a roaming user, when the user roams out of the home network, all services of the user are routed to the home network by the visited P-CSCF, and the S-CSCF of the home network decides whether the user requests an IMS according to the REQUEST URI parameter of the SIP INVITE message. Local services or addresses using local numbering plans, so that the S-CSCF can ensure correct control of user services.

The implementation process of the inventive method has been described in detail above with reference to Fig. 1, now for example as follows:

For example: an American mobile user roams to China and registers to China Mobile's network. China Mobile places all the local service information provided by it on a WEB server. Card number service 200..., the user obtains these local service information by accessing the WEB server, and saves it in the user terminal, and records the network identification of China Mobile at the same time. When the user wants to initiate an IP phone service, he dials 17951 before the normal called number. The user terminal analyzes the saved local service information and recognizes that 17951 is a local service number. Set the local service identifier in the URI parameter. Then the network proceeds according to the normal local business processing flow.

In order to avoid storing too much local service information of the visited network in the user terminal, when the roaming user terminal leaves the current visited network, the recorded IMS local service information of the visited network can be deleted immediately, or the recorded visited network can be deleted after waiting for a predetermined time IMS local service information. The specific waiting time is determined by the operator.

While the invention has been described by way of example, those skilled in the art will appreciate that there are many variations and changes to the invention without departing from the spirit of the invention, and it is intended that the appended claims cover such variations and changes without departing from the spirit of the invention.

Claims (9)

1. A method for processing local services in a mobile network IP multimedia subsystem, characterized in that, comprising: A. After the user terminal roams out of the home network, it first accesses the current access network to register with the IP multimedia subsystem; B. The user terminal obtains and records the local service information of the IP multimedia subsystem of the currently visited network; C. When the user terminal initiates an IP Multimedia Subsystem service request, identify whether the service request is a local service according to the recorded IP Multimedia Subsystem local service information of the currently accessed network; D. Identify the REQUEST URI parameter in the initial session protocol INVITE message of the service request according to the identification result. 2. The method for processing local services in the mobile network IP multimedia subsystem according to claim 1, wherein the user terminal obtains the local service information of the IP multimedia subsystem of the current access network in the step B through the following steps: After receiving the registration of the IP multimedia subsystem of the user terminal, the currently visited network actively delivers the local service information of the IP multimedia subsystem to the user terminal. 3. The method for processing local services in the IP multimedia subsystem of the mobile network according to claim 1, wherein the acquisition of the local service information of the IP multimedia subsystem of the currently accessed network by the user terminal in the step B is also realized by the following steps : The user terminal obtains and records the local service information of the IP multimedia subsystem of the currently accessed network The user terminal requests local service information from the currently visited network; The currently visited network sends IP multimedia subsystem local service information to the user terminal according to the request of the user terminal. 4. The method for processing local services in the IP multimedia subsystem of the mobile network according to claim 1, wherein the acquisition of the local service information of the IP multimedia subsystem of the currently accessed network by the user terminal in the step B is also realized by the following steps : After receiving the registration of the IP multimedia subsystem of the user terminal, the home network issues the local service information of the IP multimedia subsystem of the currently visited network. 5. The method for processing local services in the IP multimedia subsystem of the mobile network according to claim 1, characterized in that, in the step B, the user terminal acquires the local service information of the IP multimedia subsystem currently visiting the network and is also realized by the following steps : The user terminal requests the home network for local service information of the currently visited network; The home network delivers the IP multimedia subsystem local service information of the currently visited network to the user terminal. 6. The method for processing local services in the mobile network IP multimedia subsystem according to any one of claims 1 to 5, wherein the local service information of the IP multimedia subsystem includes: local service address related information, the The ID of the currently accessed network. 7. The method for processing local services in the mobile network IP multimedia subsystem according to claim 1, wherein said step C specifically comprises: C1. The user terminal initiates an IP multimedia subsystem service request; C2. Query the recorded local service information of the IP multimedia subsystem currently visiting the network according to the address of the service request; C3. When the address of the service request is located in the recorded local service information of the IP multimedia subsystem of the currently visited network, the service request is a local service. 8. The method for processing local services in the mobile network IP multimedia subsystem according to claim 1, wherein the method further comprises: When the user terminal leaves the currently visited network, delete the recorded IP multimedia subsystem local service information of the currently visited network in a predetermined manner. 9. The method for processing local services in the mobile network IP multimedia subsystem according to claim 8, characterized in that the predetermined method comprises: Immediately delete the recorded IP Multimedia Subsystem local service information of the currently visited network; or delete the recorded IP Multimedia Subsystem local service information of the currently visited network after waiting for a predetermined time.

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