CN101132645A

CN101132645A - Method for changing control function of processing proxy call conversation by IP multimedia subsystem

Info

Publication number: CN101132645A
Application number: CNA2007101525384A
Authority: CN
Inventors: 王斌; 盛国平; 张宝健
Original assignee: ZTE Corp
Current assignee: ZTE Corp
Priority date: 2007-09-27
Filing date: 2007-09-27
Publication date: 2008-02-27
Anticipated expiration: 2027-09-27
Also published as: CN101132645B

Abstract

This invention discloses a method for processing variation of proxy call control function of IP multimedia system, in which, after receiving registriation request sent by a user, S-CSCF tansmits a subscription notification message to P-CSCF1 labeling a change of the user registration state if it tests that P-CSCF registered by the user has been changed from the first proxy call session control function P-CSCF1 to a second P-CSCF2, which resolves the problem of data redundancy on the original P-CSCF due to the change of the registration state of the user.

Description

IP Multimedia System is handled the method for Proxy Call Session Control Function change

Technical field

The present invention relates to the communications field, more specifically, relate to a kind of method of in IP Multimedia System, handling the Proxy Call Session Control Function change.

Background technology

IP Multimedia System (IP Multimedia Subsystem, be called for short IMS) based on Session Initiation Protocol (Session Initiation Protocol, Session initiation Protocol), this agreement is a kind of application layer protocol of the session of creating two sides or in many ways, revise, terminate.Main functional entity comprises controlling call entity (the Call Session ControlFunction that is used to control functions such as user's registration, session control among the IMS, CSCF, be called for short CSCF), be used to manage concentratedly home subscriber server (the Home Subscriber Server of user contracting data, be called for short HSS), and the application server (Application Server is called for short AS) that is used to provide miscellaneous service logic control function.

Fig. 1 is the flow chart that IMS user's registration and user registration state are subscribed to.It relates generally to following network element and equipment: subscriber equipment (User Equipment is called for short UE); Carry out Proxy Call Session Control Function (Proxy Call Session Control Function is called for short P-CSCF); Service call conversation control function (Serving Call Session Control Function is called for short S-CSCF);

The IMS network uses the registration process of Session Initiation Protocol to realize that the user inserts the IMS network.User registration success will be set up relation between public user identity and this user's current location at home domain S-CSCF.Registration process may further comprise the steps as shown in Figure 1:

S101～S104, UE registers to S-CSCF by P-CSCF, and after the user registration success, S-CSCF makes up and to succeed in registration response message (200OK) and to send it to UE by P-CSCF, and therefore, P-CSCF and UE all can be known user registration success;

S105～S106, P-CSCF initiates subscription request message, booking reader's login state; S-CSCF returns the subscription success response to P-CSCF after subscribe request is handled;

S107～S108, when User Status changed, S-CSCF sent subscribing notification message to P-CSCF; P-CSCF upgrades user registration state after receiving subscribing notification message, and returns the success response of subscribing notification message to S-CSCF.

As can be seen from Figure 1, if the user roams, the P-CSCF of user's registration changes, and the P-CSCF of former registration can't be known, therefore also can't normally delete this user data of users.As shown in Figure 2, P-CSCF1 is the P-CSCF of former registration, and P-CSCF2 is the P-CSCF of new registration, and this process may further comprise the steps:

S201, UE finishes registration on S-CSCF by P-CSCF1; And P-CSCF1 finishes the login state subscription on S-CSCF, and the flow process of its flow process and the described S101～S108 of Fig. 1 is basic identical, sees the description of the corresponding flow process of Fig. 1 for details;

S202, UE finishes registration on S-CSCF by P-CSCF2; And P-CSCF2 finishes the login state subscription on S-CSCF, and the flow process of its flow process and the described S101～S108 of Fig. 1 is basic identical, sees the description of the corresponding flow process of Fig. 1 for details.

The problems referred to above can make P-CSCF1 can't know that the user registers on P-CSCF2, cause the redundant existence of user data long-time (this duration is that former UE registers remaining duration) on P-CSCF1, and its performance is reduced; The existence of redundant data makes troubles also for the management of operator, statistics.

Summary of the invention

The technical problem to be solved in the present invention provides a kind of method of handling the P-CSCF change in the IMS network, solves under registration P-CSCF change situation, can't in time know the problem that user registration state changes.

In order to address the above problem, the invention provides a kind of IP Multimedia System and handle the method for Proxy Call Session Control Function change, after S-CSCF receives the login request message of user's transmission, change to the second Proxy Call Session Control Function P-CSCF2 by the first Proxy Call Session Control Function P-CSCF1 if check out the P-CSCF of this user's registration, then send the subscribing notification message that this user registration state of sign changes to P-CSCF1.

Further, said method comprising the steps of:

(a) UE initiates login request message by P-CSCF2 to S-CSCF;

(b) S-CSCF checks that whether the P-CSCF of UE registration changes, and then carry out next step if find change, otherwise this method finishes;

(c) S-CSCF to P-CSCF1 to sending described subscribing notification message.

Further, above-mentioned method can also have following characteristics: in the step (c), S-CSCF compares by the unified resource identifier of the P-CSCF that this user that will preserve among unified resource identifier in the field of the PATH in the described login request message and the S-CSCF registers, whether the P-CSCF that checks this user's registration changes, judge then that as the URI difference change has taken place the P-CSCF that the user registers, otherwise, judge the not change of P-CSCF of user's registration.

Further, above-mentioned method can also have following characteristics: in the step (c), the state of user's registration is a unactivated state in the described subscribing notification message that S-CSCF sends.

Further, above-mentioned method can also have following characteristics: also comprise following steps afterwards in described step (c): after described P-CSCF1 receives described subscribing notification message, with this user's user's registration information deletion.

Further, above-mentioned method can also have following characteristics: the P-CSCF change of user registration is that the reason owing to user's roaming causes.

Compared with prior art, whether the P-CSCF that the present invention registers the user by S-CSCF changes and checks, and pass through to send subscribing notification message to the P-CSCF of former registration, the P-CSCF of former registration after receiving subscribing notification message deletes user's registration information, thereby solution user's P-CSCF produces the upward problem of data redundancy of former registration P-CSCF when changing.

Description of drawings

Fig. 1 is the flow chart of IMS registration of the prior art and login state subscription;

Fig. 2 is the flow chart of IMS user's of the prior art P-CSCF change;

Fig. 3 is the flow chart of the P-CSCF change of embodiment of the invention process user.

Embodiment

In order in time to solve the problem that data redundancy takes place when the P-CSCF that is caused by reasons such as user's roamings changes, the core idea of technical scheme of the present invention is: when S-CSCF receives login request message, whether the P-CSCF that checks user's registration changes, if change, then the P-CSCF to former registration sends subscribing notification message, notify this user's of P-CSCF of former registration login state to change, former P-CSCF can delete this user data according to this subscribing notification message.

The invention will be further described below in conjunction with the drawings and specific embodiments.

Fig. 3 has described one embodiment of the present of invention, promptly roams the user, when change takes place the P-CSCF of its registration, the handling process of S-CSCF, P-CSCF1 among the figure is the P-CSCF of former registration, and P-CSCF2 is the P-CSCF of new registration, and its handling process may further comprise the steps:

S301, UE finishes after the registration on the S-CSCF by P-CSCF1; P-CSCF1 finishes the login state subscription on S-CSCF, and the flow process of its flow process and the described S101～S108 of Fig. 1 is basic identical, referring to the description of the corresponding flow process of Fig. 1;

S302～S303, UE sends login request message by P-CSCF2 to S-CSCF;

The P-CSCF that S304, S-CSCF are checked through user's registration changes;

S-CSCF passes through (the Uniform Resource Identifier of the unified resource identifier in the field of the PATH in the above-mentioned login request message, be called for short URI) with S-CSCF in the URI of P-CSCF of this user's registration of preserving compare, whether the P-CSCF that checks this user's registration changes, judge then that as the URI difference change has taken place the P-CSCF that the user registers, otherwise, judge the not change of P-CSCF of user's registration.

S305, S-CSCF sends subscribing notification message (Notify) to P-CSCF1, and this user's of notice P-CSCF1 login state changes;

The identification information that comprises the user in the described subscribing notification message, i.e. user's URI, and this user's login state is set to un-activation (deactivated) in this subscribing notification message.

P-CSCF1 is after receiving this subscribing notification message, according to the log-on message deletion of the user totem information that wherein comprises with this user.

S306～S307, S-CSCF sends the response of succeeding in registration to UE by P-CSCF2;

S308, P-CSCF2 finish the login state subscription on the S-CSCF, referring to the description of the corresponding flow process of Fig. 1.

After step S308, if the P-CSCF of UE registration changes again, for example, UE initiates login request message by P-CSCF3, P-CSCF4...... to S-CSCF again, then when S-CSCF initiated login request message, S-CSCF handled according to the handling process of step S304～S308 after changing in P-CSCF generation each time.The principle of handling is exactly, UE by P-CSCF3 when S-CSCF initiates login request message, S-CSCF is checked through generation after changing, to the previous P-CSCF of this user's registration, be that P-CSCF2 sends subscribing notification message, notify it to delete this user data of users; UE again by P-CSCF4 when S-CSCF initiates login request message, S-CSCF is checked through generation after changing, sends subscribing notification message to P-CSCF3 ..., the rest may be inferred.

Certainly; the present invention also can have other various embodiments; under the situation that does not deviate from spirit of the present invention and essence thereof; those of ordinary skill in the art work as can make various corresponding changes and distortion according to the present invention, but these corresponding changes and distortion all should belong to the protection range of the appended claim of the present invention.

Claims

1.IP IP multimedia subsystem, IMS is handled the method for Proxy Call Session Control Function change, after S-CSCF receives the login request message of user's transmission, change to the second Proxy Call Session Control Function P-CSCF2 by the first Proxy Call Session Control Function P-CSCF1 if check out the P-CSCF of this user's registration, then send the subscribing notification message that this user registration state of sign changes to P-CSCF1.

2. the method for claim 1 is characterized in that, said method comprising the steps of:

(a) UE initiates login request message by P-CSCF2 to S-CSCF;

(c) S-CSCF to P-CSCF1 to sending described subscribing notification message.

3. method as claimed in claim 2, it is characterized in that, in the step (c), S-CSCF compares by the unified resource identifier of the P-CSCF that this user that will preserve among unified resource identifier in the field of the PATH in the described login request message and the S-CSCF registers, whether the P-CSCF that checks this user's registration changes, judge then that as the URI difference change has taken place the P-CSCF that the user registers, otherwise, judge the not change of P-CSCF of user's registration.

4. method as claimed in claim 2 is characterized in that, in the step (c), the state of user's registration is a unactivated state in the described subscribing notification message that S-CSCF sends.

5. method as claimed in claim 2 is characterized in that, also comprises following steps afterwards in described step (c): after described P-CSCF1 receives described subscribing notification message, with this user's user's registration information deletion.

6. method as claimed in claim 1 or 2 is characterized in that, the P-CSCF change of user registration is that the reason owing to user's roaming causes.