CN101577914B

CN101577914B - Method and system for processing S-CSCF alteration in IMS network

Info

Publication number: CN101577914B
Application number: CN200910203284.3A
Authority: CN
Inventors: 罗永胜; 王斌; 盛国平
Original assignee: ZTE Corp
Current assignee: ZTE Corp
Priority date: 2009-06-04
Filing date: 2009-06-04
Publication date: 2011-05-11
Anticipated expiration: 2029-06-04
Also published as: CN101577914A; WO2010139279A1

Abstract

A method and a system for processing S-CSCF alteration in an IMS network are disclosed, the method comprises the steps that: after receiving a server assignment request sent by S-CSCF, if checking that the user represents a registered state in the HSS and the presently-registered second server calling session control function S-CSCF2 and the last-registered first server calling session control function S-CSCF are inconsistent, HSS sends a server assignment failure response to S-CSCF2 and indicates that the S-CSCF registered by a user is altered in the server assignment failure response; after receiving the server assignment failure response from the server, the S-CSCF2 sends a multimedia authorization request MAR to the HSS in the event that the alteration of the S-CSCF occurs under the indication in the failure response. By means of the method and the system provided by the invention, successful registration of the user can still be achieved on condition of the alteration of the S-CSCF in the IMS network, and requirements of network service can be used.

Description

The method and system of treatment S in a kind of IMS network-CSCF change

Technical field

The present invention relates to the communications field, more specifically, relate to a kind of IP Multimedia System (IPMultimedia Core Network Subsystem, the method and system of the service call conversation control function of process user registration abbreviation IMS) (Serving Call Session Control Function is called for short S-CSCF) change.

Background technology

IP Multimedia System is third generation affiliate tissue (3rd Generation PartnershipProject, abbreviation 3GPP) the next generation network standard of definition, its distinguishing feature is to have adopted session initiation protocol (Session Initial Protocol, be called for short SIP) system, communication is irrelevant with access, can possess the multimedia service controlled function separates with bearing capacity, call out and service detach, application separates with service, business and network detach, and multiple abilities such as mobile network and internet service fusion.

Main functional entity comprises controlling call entity (the Call Session Control Function of functions such as control user registration, session control among the IMS, abbreviation CSCF), home subscriber server (the Home Subscriber Server of centralized management user contracting data, the application server (Application Server is called for short AS) of miscellaneous service logic control function is provided abbreviation HSS).In addition, in conversation procedure, also relate to interconnection boundary Control function (Interconnection Border Control Function is called for short IBCF), signatory locator function functional entitys such as (Subscription Locator Function are called for short SLF).

In the IMS framework, user's a plurality of service call conversation control functions (be called for short S-CSCF) of can contracting are in not responses such as a S-CSCF device fails, the perhaps host name of configuration modification S-CSCF, and under the situation such as disaster tolerance, the situation of S-CSCF change can take place all.In the prior art, in user registration course, when S-CSCF changes under the situations such as generation disaster tolerance, may cause the user not register.

In the prior art, the flow process that S-CSCF change causes registration failure may further comprise the steps as shown in Figure 1:

S101, the user succeeds in registration at S-CSCF2;

S102, because faults such as link down take place S-CSCF2, the user switches to and succeeds in registration on the S-CSCF1, the user registration state on the HSS also is associated with on the S-CSCF1;

S103, the new register requirement of user sends to query call conversation control function (being called for short I-CSCF) through Proxy Call Session Control Function (being called for short P-CSCF);

S104, I-CSCF is forwarded to S-CSCF1 with register requirement behind inquiry HSS;

S105, S-CSCF1 perhaps returns the errored response of 3xx or 408 because faults such as link down do not have response;

S106, I-CSCF reselects S-CSCF, and register requirement is sent to S-CSCF2;

S107, the user registered at S-CSCF2, and S-CSCF2 has this user data of users and authorization data information, can not send multimedia authentication request (Multimedia-Auth-Request to HSS, be called for short MAR) obtain authorization data, directly send 401 authentication challenge responses;

S108, S-CSCF2 send 401 authentication challenge responses to I-CSCF;

S109, I-CSCF transmit 401 authentication challenge responses and give P-CSCF, and P-CSCF is transmitted to subscriber equipment (User Equipment is called for short UE) again;

S110, user's the register requirement of carrying challenge responses sends to I-CSCF through P-CSCF;

S111, I-CSCF is forwarded to S-CSCF2 with register requirement;

After S112, S-CSCF2 passed through subscription authentication, send server assignment request (Server-Assignment-Request is called for short SAR) was to HSS;

S113, HSS checks user registration state, finds that the S-CSCF of this registration and the S-CSCF that last time, registration was assigned are inconsistent, sends errored response;

S114, HSS send server assign failure response to S-CSCF2;

S115, registration failure, S-CSCF2 sends registration failure and responds I-CSCF;

S116, I-CSCF transmits registration failure and responds to P-CSCF, and P-CSCF is transmitted to the user again and establishes UE.

From said process as can be seen because when repeatedly disaster tolerance etc. caused the S-CSCF change that the user registers, S-CSCF2 was because the local authorization data that the user has been arranged no longer obtains the authentication information data to HSS; And follow-up authentication is by the back, when the send server assignment request arrives HSS, HSS presses the S-CSCF of this registration of protocol testing and registered the S-CSCF that assigns last time inconsistent, return errored response, prior art is not done further processing to this flow process mistake, direct registration failure, it is unsuccessful to cause the user to register, and can't use service.

In addition, when change took place the S-CSCF of user's registration, the S-CSCF of former registration can't be known, therefore also can't normally delete this user data of users, thereby cause data redundancy.

Summary of the invention

The technical problem to be solved in the present invention provides the method and system of treatment S in a kind of IMS network-CSCF change, satisfies that the user still can succeed in registration under S-CSCF change situation in the IMS network, and uses the demand of network service.

In order to address the above problem, the invention provides the method for treatment S in a kind of IMS network-CSCF change, comprising:

After home subscriber server HSS receives the server assignment request of service broker's CSCF S-CSCF transmission, if check out that the user is registered at the login state of described HSS, and the first service call conversation control function S-CSCF1 that second service call conversation control function S-CSCF2 of this registration and last time, registration was assigned is inconsistent, then send server assigns failure response to give described S-CSCF2, and the S-CSCF of this user's registration of indication in described server assignment failure response changes;

After described S-CSCF2 receives described server assignment failure response,, then send multimedia authentication request MAR to described HSS if indication S-CSCF changes in the described failure response.

Further, said method also can have following characteristics:

Described HSS checks by the public user identity PUI that checks described user whether this user's login state is registered.

Further, said method also can have following characteristics:

Described HSS compares by the host name of the S-CSCF of this user's registration of will preserve among the host name of the S-CSCF in the described server assignment request and the described HSS, checks whether the S-CSCF of this user's registration is inconsistent with the S-CSCF of registration before.

Further, said method also can have following characteristics:

Described HSS sends the network de-registration request to described S-CSCF1 after receiving described MAR request and finishing follow-up user's register flow path, notify the S-CSCF of this user's registration of described S-CSCF1 to change;

After described S-CSCF1 receives described network de-registration request, delete this user's local user data, the S-CSCF that perhaps keeps this user's registration of user data and mark changes; Concurrent SCN Space Cable Network is nullified response and is given described HSS.

Further, said method also can have following characteristics:

If described HSS does not receive described network and nullifies response, then behind certain hour, send the network de-registration request once more, up to receiving network cancellation response or surpassing the higher limit of retransmitting number of times.

Further, said method also can have following characteristics:

Described HSS indicates the S-CSCF of this user's registration to change by the failure code in the described server assignment failure response.

The present invention also provides the system of treatment S in a kind of IMS network-CSCF change, comprises user equipment (UE), home subscriber server HSS, the first service call conversation control function S-CSCF1 and the second service call conversation control function S-CSCF2, wherein:

Described HSS is used for, after receiving the server assignment request of described S-CSCF2 transmission, if check out that described UE is registered at the login state of described HSS, and the described S-CSCF1 that the S-CSCF2 of this registration and last time, registration was assigned is inconsistent, then send server assigns failure response to give described S-CSCF2, and the S-CSCF of this user's registration of indication in described server assignment failure response changes; And, after receiving the multimedia authentication request MAR that described S-CSCF2 sends, finish follow-up user's register flow path;

Described S-CSCF2 is used for, and after receiving described server assignment failure response, the indication that change takes place according to S-CSCF wherein sends described MAR request to described HSS.

Further, said system also can have following characteristics:

Described HSS also is used for, and after finishing follow-up user's register flow path, sends the network de-registration request to described S-CSCF1, notifies the S-CSCF of this user's registration of described S-CSCF1 to change;

Described S-CSCF1 deletes this user's local user data after receiving described network de-registration request, the S-CSCF that perhaps keeps this user's registration of user data and mark changes; Concurrent SCN Space Cable Network is nullified response and is given described HSS.

Further, said system also can have following characteristics:

Described HSS also is used for, and after sending described network de-registration request, nullifies response if receive described network, then sends described network de-registration request behind certain hour once more, up to receiving network cancellation response or surpassing the higher limit of retransmitting number of times.

Compared with prior art, the present invention S-CSCF in IP Multimedia System takes place in the registration process under the change situation, by adopting S-CSCF to initiate the method for MAR authorizing procedure again, avoided causing the user to register to use the defective of network service because of the S-CSCF change; Simultaneously, also because therefore the S-CSCF that the change advisory of S-CSCF is original has guaranteed the data consistency of user in the IMS network.

Description of drawings

Fig. 1 causes the process chart of registration failure for existing S-CSCF change;

Fig. 2 is the process chart of user registration success under the S-CSCF change situation of the embodiment of the invention;

Fig. 3 is the system schematic of the embodiment of the invention.

Embodiment

The present invention mainly adopts following technical scheme:

After HSS receives the server assignment request SAR of S-CSCF transmission, if check out that this user is registered at the login state of HSS, and the first service call conversation control function S-CSCF1 that the second service call conversation control function S-CSCF2 of this registration and last time, registration was assigned is inconsistent, then in sending to the server assignment failure response of S-CSCF2 the S-CSCF of this user's registration of indication with before the SCSCF of registration inconsistent;

After S-CSCF2 receives above-mentioned server assignment failure response,, then send multimedia authentication request (Multimedia-Auth-Request is called for short MAR) to HSS if the inconsistent situation of SCSCF has taken place in indication in this failure response.

Adopt this technical scheme, HSS will preserve the host name of the S-CSCF2 that carries in the MAR request after receiving MAR request, and record comprises the modification information of the host name of former S-CSCF1 etc., to finish follow-up user's register flow path.

Like this, through the MAR authentication process, when subsequent treatment server assignment request SAR, HSS can not return errored response again because S-CSCF is inconsistent, the user can successfully be registered.

Further, after the user succeeds in registration through this, HSS can send network de-registration request (Registration-Termination-Request is called for short RTR) and to original S-CSCF1, notify this user of original S-CSCF1 to be assigned to another new S-CSCF;

After S-CSCF1 receives the network de-registration request RTR of HSS, learn that this user has assigned a new S-CSCF, then delete this user's local user data information, and transmission RTA responds to HSS.Perhaps, also can keep this user's local user data, and this user of mark is a new S-CSCF registration.

In addition, when HSS receives the server assignment request SAR that S-CSCF sends, by checking user's public user identity (Public User Identities, abbreviation PUI) judging this user registers, and the host name of the S-CSCF by this user's registration of will preserve among the host name of the S-CSCF in the described server assignment request and the described HSS compares, and checks whether the S-CSCF of this registration is inconsistent with the S-CSCF that last time, registration was assigned.

In addition, when HSS finds that change takes place the S-CSCF of user's registration, also can not return errored response, but directly assign new S-CSCF, return success response, and transmission RTR ask to original S-CSCF to the user.

Below in conjunction with the drawings and specific embodiments the present invention is described in further detail.

Fig. 2 is the process chart of user registration success under the S-CSCF change situation of the embodiment of the invention, has described improved location registration process flow process, especially to the processing procedure of S-CSCF change situation in the registration process.May further comprise the steps:

S201, the user succeeds in registration at S-CSCF2;

S202, because faults such as link down take place S-CSCF2, the user switches to and succeeds in registration on the S-CSCF1, the user registration state on the HSS also is associated with on the S-CSCF1;

S203, the new register requirement of user sends to I-CSCF through P-CSCF;

S204, I-CSCF is forwarded to S-CSCF1 with register requirement behind inquiry HSS;

S205, S-CSCF1 perhaps returns the errored response of 3xx or 408 because faults such as link down do not have response;

S206, I-CSCF reselects S-CSCF, and register requirement is sent to S-CSCF2;

S207, because the user registered at S-CSCF2, S-CSCF2 has this user data of users and authorization data information, thereby can not send multimedia authentication request MAR to HSS and obtain authorization data, directly sends 401 authentication challenge responses;

S208, S-CSCF2 send 401 authentication challenge responses to I-CSCF;

S209, I-CSCF transmit 401 authentication challenge responses and give P-CSCF, and P-CSCF is transmitted to user equipment (UE) again;

S210, user's the register requirement of carrying challenge responses sends to I-CSCF through P-CSCF;

S211, I-CSCF is forwarded to S-CSCF2 with register requirement;

After S212, S-CSCF2 pass through subscription authentication, send and obtain server assignment request SAR to HSS;

S213, home subscriber server HSS receive the server assignment request SAR that S-CSCF sends, and check that the PUI that finds the user registers, and the S-CSCF of the S-CSCF of this registration and registration appointment last time is inconsistent, and decision sends failure response;

Wherein, HSS compares by the host name of the S-CSCF of this user's registration of will preserve among the host name of the S-CSCF in the SAR request and the described HSS, checks whether the S-CSCF that this user registers changes;

In addition, in other embodiments of the invention, HSS also can not return errored response when finding that S-CSCF is inconsistent, directly assign new S-CSCF to the user, returns success response, and transmission RTR asks to original S-CSCF.

S214, HSS assign failure response for the S-CSCF send server, and the inconsistent situation of S-CSCF has taken place in the failure code indication;

Unlike the prior art be that the server assignment failure response that HSS sends in this step includes the related content that change takes place indication S-CSCF, as failure code.

S215, S-CSCF receive the server assignment failure response, and the S-CSCF change has taken place in the failure code indication, with the original inconsistent situation of S-CSCF of assigning of this user, initiate the MAR authorizing procedure again;

Wherein, can increase local policy configuration S-CSCF here and want to initiate again the MAR authorizing procedure, and after MAR asked successfully, whether S-CSCF carried out 401 challenges to UE.

S216, S-CSCF initiate MAR asks HSS to obtain user authentication information;

S217, HSS receive the MAR request, preserve the new S-CSCF host name of carrying in this request, be checked through S-CSCF after changing, the HSS record comprises change situation information such as original S-CSCF host name, and the multimedia authentication that returns success response MAA, carries user authentication information in response;

Like this, through the processing of multimedia authentication request MAR, HSS can not return errored response because S-CSCF is inconsistent in subsequent treatment server assignment request SAR.

S218, according to the local policy setting, S-CSCF2 sends 401 authentication challenge responses to I-CSCF;

S219, I-CSCF transmit 401 authentication challenge responses and give P-CSCF, and P-CSCF is transmitted to user equipment (UE) again;

S220, user's the register requirement of carrying challenge responses sends to I-CSCF through P-CSCF;

S221, I-CSCF is forwarded to S-CSCF2 with register requirement;

After S222, S-CSCF2 pass through subscription authentication, send and obtain server assignment request SAR to HSS;

S223, home subscriber server HSS receives the server assignment request SAR that S-CSCF sends, because of in the MAR flow process in front, the S-CSCF of user's association has made new S-CSCF2 into, here can be because of the inconsistent refusal of S-CSCF, user data is carried in the SAA response that HSS returns success in response;

S224 succeeds in registration, and S-CSCF2 sends to succeed in registration and responds I-CSCF;

S225, I-CSCF transmit the response of succeeding in registration and give P-CSCF, and P-CSCF is transmitted to the user again and establishes UE;

S226, after this succeeded in registration, HSS was checked through this registration S-CSCF change has taken place, and sends network de-registration request RTR to original S-CSCF, notifies this user of original S-CSCF1 to be assigned to another new S-CSCF;

Certainly, in other embodiments of the invention, after this succeeded in registration, HSS also can adopt other request or method to notify this user of original S-CSCF to be assigned to another new S-CSCF.

S227, HSS send network de-registration request RTR to original S-CSCF1;

S228, S-CSCF1 receives the network de-registration request RTR of HSS, indicate this user to assign a new S-CSCF, delete this user's local user data information, perhaps also can not delete user data according to local policy configuration, just this user of mark is a new S-CSCF registration.S-CSCF1 sends network and nullifies response RTA to HSS.

If because faults such as S-CSCF link down, HSS does not receive the RTA response of S-CSCF, can behind certain hour, attempt sending the RTR request once more and notify this user of original S-CSCF to be assigned to another new S-CSCF, up to receiving the RTA response or attempting surpassing the higher limit of retransmitting number of times.And when HSS did not receive the RTA response, attempting sending the blanking time of RTR request once more and attempt retransmitting the number of times restriction can be according to this locality configuration decision.

Fig. 3 is the system schematic of the treatment S-CSCF change of the embodiment of the invention, and the present invention only lists part related to the present invention in the description of system framework, then specifically describe no longer one by one as for whole IMS system framework; In addition, user's message interaction process between each network element etc. when the IMS network registry is also given unnecessary details no longer one by one, specifically please refer to the description in Fig. 1 of the present invention and Fig. 2 part.

As shown in Figure 3, it relates generally to following network element and equipment: user equipment (UE); And the Proxy Call Session Control Function in the IMS network claims P-CSCF, service call conversation control function S-CSCF (comprising the first service call conversation control function S-CSCF1 and the second service call conversation control function S-CSCF2), query call conversation control function I-CSCF, home subscriber server HSS, wherein:

HSS is mainly used in, after receiving the server assignment request SAR that S-CSCF2 sends, if check out that this user registers, and the S-CSCF1 that the S-CSCF2 of this registration and last time, registration was assigned is inconsistent, then send server assigns failure response to give S-CSCF2, and the S-CSCF of this user's registration of indication in the server assignment failure response changes to S-CSCF2 by S-CSCF1; And after receiving the MAR request that described S-CSCF2 sends, the host name of preserving the S-CSCF2 that carries in the MAR request, and record comprises the modification information of the host name of S-CSCF1 etc. is finished the follow-up register flow path of user so that cooperate with S-CSCF2;

S-CSCF2 is mainly used in, receive the server assignment failure response after, send multimedia authentication request MAR according to described indication to HSS;

P-CSCF is mainly used in the forwarding of the interaction message of carrying out UE and IMS network etc.;

I-CSCF is mainly used in by inquiry HSS registration request from user etc. is forwarded to available S-CSCF, and, will be transmitted to UE by P-CSCF from the message of IMS network.

Further, HSS also is used for, and after finishing follow-up user's register flow path, sends the network de-registration request to S-CSCF1, and the S-CSCF of this user's registration of notice S-CSCF1 changes;

S-CSCF1 deletes this user's local user data after receiving described network de-registration request, the S-CSCF that perhaps keeps this user's registration of user data and mark changes; Concurrent SCN Space Cable Network is nullified response and is given described HSS.

Further, described HSS also is used for, and after sending described network de-registration request, do not receive when described network is nullified response, sends the network de-registration request once more behind certain hour, up to receiving that network nullifies response or surpass the higher limit of retransmitting number of times.

In sum, in the prior art, there is defective in location registration process when S-CSCF is changed, because HSS finds the S-CSCF of this registration of user and registered the S-CSCF that assigns last time inconsistent in the server assignment request, return errored response, prior art is not done further processing to this flow process mistake, directly registration failure, it is unsuccessful to cause the user to register, and can't use service; By improving user's register flow path, increase the processing of S-CSCF change situation in the present invention, initiated the MAR authorizing procedure again, reached the purpose that the user can succeed in registration and use network to serve.

Claims

1. the method for treatment S in the IMS network-CSCF change is characterized in that, comprising:

After home subscriber server HSS receives the server assignment request of second service call conversation control function S-CSCF2 transmission, if check out that the user is registered at the login state of described HSS, and the first service call conversation control function S-CSCF1 that second service call conversation control function S-CSCF2 of this registration and last time, registration was assigned is inconsistent, then send server assigns failure response to give described S-CSCF2, and the S-CSCF of this user's registration of indication in described server assignment failure response changes;

2. the method for claim 1 is characterized in that,

3. the method for claim 1 is characterized in that,

4. as claim 1,2 or 3 described methods, it is characterized in that,

5. method as claimed in claim 4 is characterized in that,

6. the method for claim 1 is characterized in that,

7. the system of treatment S in the IMS network-CSCF change is characterized in that,

Comprise user equipment (UE), home subscriber server HSS, the first service call conversation control function S-CSCF1 and the second service call conversation control function S-CSCF2, wherein:

8. system as claimed in claim 7 is characterized in that,

9. as claim 7 or 8 described systems, it is characterized in that,

10. system as claimed in claim 9 is characterized in that,