CN104253815A - IMS (IP multimedia subsystem)-based service triggering method and IMS-based service triggering system - Google Patents

Abstract

The present invention provides a service triggering method based on the IMS system. First, when the UE registers, the S-CSCF downloads the user subscription data from the HSS and saves it locally. The signed iFC information includes the application server information to be triggered and the trigger application server information. SPT trigger conditions, SPT contains user service information; secondly, after the UE is successfully registered, the S-CSCF needs to subscribe to the specific application server for the specific service of the user, and save the user service information returned by the specific application server locally; finally, the S-CSCF receives After the call request, it can decide to trigger the logic of the application server according to matching user service information and SPT trigger conditions. The invention also discloses a service triggering system based on the IMS system. The invention realizes matching and triggering the application server according to the service signed by the user, enriches the logic of service triggering, satisfies different requirements of the operator, and has no dependence on the terminal.

Description

A service trigger method and system based on IMS system

technical field

The present invention relates to the communication field, and more particularly relates to a method and system for IMS (IP Multimedia Subsystem) service triggering.

Background technique

IP Multimedia Subsystem (IP Multimedia subsystem, IMS) is the standard of the next generation network defined by 3GPP (3rd Generation Partnership Project, third generation partnership organization), and its notable feature is the adoption of SIP (SessionInitiation Protocol, Session Initiation Protocol) protocol , with the separation of business control and bearing capacity, separation of call and session, separation of application and service, separation of business and network, and integration of mobile network and Internet services.

Figure 1 is a diagram of the IMS system architecture, which mainly consists of UE (User Equipment, user equipment) (101), and the IMS core network includes proxy CSCF (Proxy Call Session Control Function, P-CSCF) / inquiry CSCF (Interrogating Call Session Control Function, I-CSCF) CSCF) (102), Serving Call Session Control Function (S-CSCF) (103), Application Server (Application Server, AS) (104), Home Subscriber Server (Home Subscriber Server, HSS) (105). Among the network elements shown, the UE is connected to the P-CSCF through the Gm interface; the P-CSCF, I-CSCF, and S-CSCF are interconnected through the Mw interface; the HSS is connected to the I-CSCF, S-CSCF through the Cx interface. The CSCF is connected to the AS through the Sh interface; the S-CSCF is connected to the AS through the ISC (IMS service control, IMS service control, ISC for short) interface.

The P-CSCF is the first contact point of the user in the IMS system, and all SIP signaling must go through the P-CSCF no matter whether it is from the UE or sent to the UE. The S-CSCF is the core of the IMS, located in the home network, and performs session control and registration services for the UE. After the UE successfully registers in the IMS system, the S-CSCF locally saves the user subscription information downloaded from the HSS, and the S-CSCF implements the logic of triggering the application server according to the subscription information.

What Fig. 2 described is the flow chart of user registration in the IMS system, which mainly includes the following steps:

S201, the UE sends a registration request to the P-CSCF;

S202-S205, the registration request arrives at the S-CSCF through the P-CSCF and the I-CSCF;

S206-S216, if the S-CSCF needs to authenticate the user, it needs to obtain the user authentication vector from the HSS, and construct a challenge request (401Unauthorized message) according to the authentication vector returned in the S207 message, and forward the challenge request to the UE , the UE constructs a challenge response, after the S-CSCF receives the S215 challenge response message, S216 judges the legitimacy of the user, and completes the authentication and authentication of the user; if authentication and authentication is not required, S217 can be directly executed;

S217-S222, the S-CSCF stores the user subscription data downloaded from the HSS, constructs a registration success response, and forwards it to the UE through the I-CSCF and the P-CSCF, thereby completing the registration of the UE in the IMS network;

S223-S225, the S-CSCF sends a third-party registration request to the AS according to the subscription information of the user.

In step S219, the S-CSCF downloads the subscription information of the user from the HSS, the subscription information includes service trigger filter rules (initial Filter Criteria, referred to as iFC), the iFC includes the information of the application server AS, and the rules for triggering the application server AS, That is, Service Point Trigger (SPT for short). The structure and parameters of SPT are shown in Figure 3. SPT includes the called number, SIP method, SIP header field, session status, and session media description. -CSCF will trigger the corresponding application server, and then the AS will execute the specific business logic. Through the existing SPT content, control and service separation can be realized, and flexible service triggering can be realized.

The existing SPT content can realize the logic of triggering the application server according to the called number, SIP header field, session status and other information. However, in some scenarios, when the S-CSCF triggers the application server, it needs to select the trigger application server according to the service subscribed by the user. For example, if the user subscribes to the unconditional forwarding service, the S-CSCF needs to trigger the call filtering server (equivalent to an application server); or if the user does not subscribe to the unconditional forwarding service, it does not need to trigger the call filtering server. The existing SPT structure cannot match and trigger the application server according to the service subscribed by the user. At the same time, the S-CSCF does not know whether the user has subscribed to certain services, so it cannot meet the needs of some networks and operators.

Contents of the invention

The technical problem to be solved by the present invention is to overcome that in the prior art, the SPT structure cannot match and trigger the application server according to the service signed by the user, and at the same time, the S-CSCF does not know whether the user has signed some service, so it cannot meet the requirements of some networks and Insufficient requirements of operators provide an IMS system-based service triggering method and system, which realize matching and triggering application servers according to services subscribed by users.

The technical solution adopted by the present invention to solve its technical problems is:

A method for triggering a service based on an IMS system, comprising the steps of:

Step A: When the user equipment UE registers, the S-CSCF in the IMS core network downloads the user subscription data from the home subscriber server HSS and saves it locally, and the service trigger filtering rule information iFC in the subscription data contains the application server information to be triggered, And trigger the SPT trigger condition of the service point trigger of the application server, and the SPT contains user service information;

Step B: After the UE is successfully registered, the S-CSCF subscribes to the specific application server for the specific service of the user, and saves the user service information returned by the specific application server locally;

Step C: After receiving the call request, the S-CSCF decides to trigger the logic of the application server according to matching user service information and SPT trigger conditions.

Further, in the method for triggering a service based on the IMS system of the present invention, the SPT in step A includes user service information, the service information is identified by a service label, and the service label identifies different services, and the SPT includes one or more Business label.

Furthermore, in the IMS system-based service triggering method of the present invention, the specific application server mentioned in step B refers to the server that stores the user's subscription service information.

Furthermore, in the IMS system-based service triggering method of the present invention, the S-CSCF in step B subscribes the user's specific service to the specific application server, based on the service label in the SPT, or based on local configuration.

Further, in the IMS system-based service triggering method of the present invention, if the user or the network modifies the subscribed service subscribed by the S-CSCF, the specific application server will notify the S-CSCF that the subscribed service of the user has changed.

Furthermore, in the method for triggering a service based on the IMS system of the present invention, in the step C, the request other than the call received by the S-CSCF also matches the logic of deciding to trigger the application server.

A service trigger system based on IMS system, including S-CSCF, HSS server, specific application server, wherein:

S-CSCF is used to match user service information and SPT trigger conditions for the user, and determine the logic of triggering the application server;

The HSS server is used to support and save the user subscription data, and the service information contained in the user subscription SPT will be supported, so that the S-CSCF can use the SPT to determine the service trigger logic;

The specific application server is used to store the user service information provided by the user, and is responsible for notifying the user service information after the S-CSCF subscribes to the user service information.

Compared with the prior art, the technical solution adopted in the present invention has the following technical effects:

The method and system for service triggering based on the IMS system provided by the present invention can match and trigger the application server according to the service signed by the user through the above steps. The contracted service decides whether to trigger the application server, which not only meets the different requirements of operators, but also has no dependence on the terminal.

Description of drawings

FIG. 1 is a diagram of a known IMS system architecture.

Fig. 2 is a flow chart of a known IMS user registration.

Fig. 3 is a schematic diagram of a known IMS network SPT structure and parameters.

FIG. 4 is a schematic diagram of a service triggering process according to the present invention.

Fig. 5 is a schematic diagram of the improved IMS network SPT structure and parameters of the present invention.

Fig. 6 is a flow chart of a specific embodiment of the registration/subscription service of the present invention.

Fig. 7 is a flow chart of a specific embodiment of the service triggering method of the present invention.

Detailed ways

In order to enable those skilled in the art to better understand the technical problems, technical solutions and technical effects in this application, an IMS system-based service trigger method and system of the present invention will be further described in detail below in conjunction with the drawings and specific implementation methods.

The invention provides an IMS system-based service triggering method and system, which realize matching and triggering application servers according to the services subscribed by users.

Fig. 4 is a schematic diagram of the service triggering process described in the present invention, a kind of IMS-based service triggering method, and the technical solution includes the following steps:

Step A: When the UE registers, the S-CSCF downloads the user subscription data from the HSS and saves it locally. The signed iFC information includes the application server information to be triggered and the SPT trigger condition for triggering the application server. The SPT includes user service information.

Further, in the step A, the service point trigger SPT may contain the service information of the user, and the service information is identified by a service label, and the service label can identify different services, such as forwarding unconditionally and forwarding on busy. For different service tags, the SPT may include one or more service tags.

Step B: After the UE registers successfully, the S-CSCF needs to subscribe to the specific application server for the specific service of the user, and save the user service information returned by the specific application server locally.

Further, in the step B, the specific application server refers to a server that knows the user's subscription service, such as MMTELAS (Multimedia Telephony Application Server, Multimedia Telephony Application Server), the application server knows whether the user has signed an unconditional forwarding, and forwarding when busy business.

Further, in the step B, which services the S-CSCF subscribes to the specific application server can be based on the service label in the SPT, or based on local configuration.

Further, in the step B, if the user/network modifies the subscribed service subscribed by the S-CSCF after the user registers successfully, the application server will notify the S-CSCF that the subscribed service of the user has changed. If the unconditional forwarding service is added/modified/deleted, the application server will notify the S-CSCF.

Step C: After receiving the call request, the S-CSCF can decide to trigger the logic of the application server according to the matching content of the two aspects. Specifically, the S-CSCF performs a matching decision to trigger the logic of the application server according to the specific service information signed by the user obtained from the specific application server and the SPT trigger condition in the IFC downloaded from the HSS.

Further, in the step C, if the SPT requires the user to subscribe to unconditional forwarding service, an application server will be triggered, and if the S-CSCF learns that the user has not subscribed to the unconditional forwarding service, then the S-CSCF will not trigger the application server .

Further, in the step C, the S-CSCF receives requests other than calls, such as messages, subscriptions, etc., which can also be matched to decide to trigger the logic of the application server.

Although the terminal can be expanded to allow the terminal to carry service information, on the one hand, the information carried by the terminal is unreliable, and on the other hand, the high requirements on the terminal are not conducive to the deployment and development of the network. Therefore, through the above steps, the present invention can match and trigger the application server according to the service subscribed by the user. This is a solution of an IMS system, and there is no requirement for the terminal.

Fig. 5 is a schematic diagram of the improved IMS network SPT structure and parameters of the present invention. The service point trigger SPT adds a service description on the basis of the original called number, SIP method, SIP header field, session state, and session media description. The service description can be 1 to n service tags, and each service tag corresponds to a certain For each service, for example, the unconditional forwarding service is defined as CFU or 001, and the busy forwarding service is defined as CFB or 002. On the basis of the existing logical relationship between SPT and application services, it can be realized that if a certain service is signed, a certain application server will be triggered, or if a certain service is not signed, a certain application server will not be triggered.

The invention relates to a method for matching and triggering an application server according to a service subscribed by a user. Before triggering the application server, the S-CSCF needs to obtain two aspects of information: (1) the trigger rule of the application server, that is, the SPT content downloaded from the HSS; (2) the service information signed by the user obtained from the specific application service. Fig. 6 is a flow chart of a specific embodiment of the registration/subscription service described in the present invention, through which two aspects of information can be obtained, and the specific steps are as follows:

S601, the user initiates IMS registration;

S602, the S-CSCF sends a user configuration request to the HSS;

S603. The S-CSCF obtains a user configuration response from the HSS. The response message includes the content of the iFC and SPT subscribed by the user, wherein the SPT is expanded and includes a service description, such as the unconditional forwarding service CFU. S-CSCF needs to store iFC/SPT information locally;

S604, user registration is successful;

S605. After the IMS is successfully registered, the S-CSCF needs to send a Subscrbe request to a specific application server that knows the user's subscription service. The request message needs to be extended and carry service information to be subscribed, such as unconditional forwarding service information. The S-CSCF can extend the SIP field in the Subscrbe request to carry the service information that needs to be subscribed. The service information that needs to be subscribed can be based on local configuration or service description in SPT;

S606, the specific application server AS returns a subscription success response, indicating that the subscription is successful;

S607, the specific application server AS notifies the S-CSCF of the subscribed service information through the Notify message, such as whether the user has subscribed to the unconditional forwarding service;

S608. The S-CSCF sends a Notify success response to the application server.

S609-S611, when the service subscribed by the user has changed, the specific application server will notify the S-CSCF of the service information subscribed to through the Notify message, for example, the user does not have the unconditional forwarding service before, but now has the unconditional forwarding service. This step is optional.

Through the above steps, after S603, the S-CSCF obtains the trigger rule of the application server, that is, the SPT content; after S605-S608, the S-CSCF obtains the service information subscribed by the user. By matching the two aspects of information, it is decided to trigger the logic of the application server. Fig. 7 is a flow chart of a specific embodiment of the service triggering method of the present invention.

S701, the S-CSCF receives a call request;

S702, the S-CSCF needs to match the service information subscribed by the user and the SPT trigger rule, and decide whether to trigger a certain application server. For example, if the SPT requires the user to have the CFU service, it will trigger the call filtering server. At this time, the S-CSCF needs to match the two according to the user's subscription service information obtained from the subscription notification from the specific application server, and according to whether the user has signed the CFU service. Information;

S703. The S-CSCF decides to trigger the logic of the application server according to the matching result. If the user subscribes to the CFU service, the call filtering server is triggered; if the user does not subscribe to the CFU service, the call filtering server is not triggered.

In summary, with the method of the present invention, on the basis of appropriate expansion of SPT content, the logic of S-CSCF subscribing to a specific application server for services signed by users is expanded at the same time, thereby realizing the services signed by users in the IMS network, Match the logic that triggers the application server. The logic of service triggering is enriched to meet different requirements of operators.

The above descriptions are only preferred examples of the present invention, and are not intended to limit the protection scope of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims (7)

1. based on a service trigger method for IMS system, it is characterized in that: comprise the steps:

Steps A: during user equipment (UE) registration, S-CSCF in IMS core net is from home subscriber server HSS download user subscription data and be kept at this locality, the Application Server information that needs trigger is comprised in business trigger filter Rule Information iFC in subscription data, and trigger the service point trigger SPT trigger condition of application server, comprise user service information in SPT;

After step B:UE succeeds in registration, S-CSCF is to the concrete business of specific application servers booking reader, and user service information specific application servers returned is kept at this locality;

After step C:S-CSCF receives call request, according to match user business information and SPT trigger condition, determine the logic triggering application server.

2. a kind of service trigger method based on IMS system according to claim 1, it is characterized in that: in SPT described in steps A, comprise user service information, this business information is identified by service label, and service label identifies different business, and SPT comprises one or more service label.

3. a kind of service trigger method based on IMS system according to claim 1, is characterized in that: the specific application servers described in step B refers to the server storing user's signing service information.

4. a kind of service trigger method based on IMS system according to claim 1, is characterized in that: the S-CSCF described in step B, to the concrete business of specific application servers booking reader, is according to the service label in SPT, or based on the configuration of this locality.

5. a kind of service trigger method based on IMS system according to claim 4, is characterized in that: if the signing service that user or network amendment S-CSCF subscribes to, specific application servers then notifies that the business that S-CSCF user contracts changes.

6. a kind of service trigger method based on IMS system according to claim 1, is characterized in that: in described step C, and the logic determining to trigger application server is mated in the S-CSCF request received beyond calling equally.

7. based on a service triggering system for IMS system, it is characterized in that: comprise S-CSCF, HSS server, specific application servers, wherein:

S-CSCF, for being user's match user business information and SPT trigger condition, determines the logic triggering application server;

HSS server, for supporting and preserving user contracting data, user contracts the business information contained by support package in SPT, uses SPT to determine business Trigger Logic for S-CSCF;

Specific application servers, for storing the user service information that user provides, when S-CSCF is after its booking reader's business information, is responsible for the business information notifying user.