CN101325731A

CN101325731A - Method for distributing service call conversation control function, system and ascription user server

Info

Publication number: CN101325731A
Application number: CN 200710074984
Authority: CN
Inventors: 李辉
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2007-06-14
Filing date: 2007-06-14
Publication date: 2008-12-17
Anticipated expiration: 2027-06-14
Also published as: WO2008151556A1; CN101325731B

Abstract

This invention relates to the communication field and discloses a method for distributing serving-call session control function. The method comprises: a home subscriber server receives request message of storing the server address sent by the interrogating-call session control function; the message comprises the address of serving-call session control function selected by the interrogating-call session control function for user; the home subscriber server checks that whether the local has stored the address of serving-call session control function for the user, if it is, then the home subscriber server returns the stored address of serving-call session control function to the interrogating-call session control function; if not, then the home subscriber server stores the selected address of serving-call session control function for the user and returns the selected address of serving-call session control function to the interrogating-call session control function. This invention further discloses a system and an application server for distributing serving-call session control function.

Description

Distribution services CSCF method, system and home subscriber server

Technical field

The present invention relates to the communications field, relate in particular to a kind of method, equipment and system of distribution services CSCF.

Background technology

IMS (IP Multimedia Subsystem, IP Multimedia System) is 3GPP (3rd GenerationPartnership Project, 3rd Generation Partnership Project) is superimposed upon a subsystem that has on the packet domain in the WCDMA network that the R5 stage increases, adopt the bearer path of packet domain for its upper strata control signaling and media delivery, introduce SIP (Session Initial Protocol, Session initiation Protocol) agreement is as professional control protocol, utilize SIP simple, easily expansion, media combination is characteristics easily, by business control is separated with carrying control, provide abundant multimedia service.

As shown in Figure 1, be a kind of communication system architecture schematic diagram that comprises the IMS network, this communication system comprises: and IMS, application server (Application Server, AS), mobile network, IP multi-media network, public switched telephone network.Wherein, IMS further comprises CSCF (Call Session ControlFunction, CSCF), Proxy Call Session Control Function (Proxy-Call Session Control Function, P-CSCF), media gateway (Media Gateway, MG), MGCF (Media GatewayControl Function, MGCF), Breakout Gateway Control Function (Breakout Gateway ControlFunction, BGCF), Media Resource Function Processor (Multimedia Resource Function Processor, MRFP), media resource function controller (Multimedia Resource Function Controller, MRFC), subscriber equipment (User Equipment, UE), Subscription Locator Function (Subscription Locator Function, SLF), home signature user server (Home Subscriber Server, HSS) etc.

In the prior art, the process of IMS control user register requirement can comprise as shown in Figure 2:

Step 101, the UE (User Equipment, subscriber equipment) that is positioned at visited network initiates register requirement to the P-CSCF of visited network;

Step 102, this P-CSCF obtains I-CSCF (Interrogating-Call Session Control Function, the query call conversation control function) address of user attaching network according to the user attaching domain names, and transmits register requirement to this I-CSCF;

Step 103, I-CSCF receives register requirement, by UAR message to the HSS of home network inquiring user login state;

Step 104, if the user registers, then can preserve the S-CSCF address of having distributed at HSS, HSS returns S-CSCF (the Serving-Call Session Control Function that the user is assigned with, service call conversation control function) address, I-CSCF route register requirement is to the S-CSCF of this distribution, and this registration and distribution S-CSCF flow process finish.If described HSS checks that the user is unregistered, then the capability set that returns home network S-CSCF by UAA message is given described I-CSCF, and execution in step 105;

Step 105, described I-CSCF selects a suitable S-CSCF according to the capability set of described S-CSCF, and transmits the S-CSCF of user's registration information to this selection;

Step 106, the S-CSCF of described selection receives register requirement, and discovery is first registration, then gets registered user's authentication collection to described HSS by UAR message;

Step 107, described HSS preserves the address of the S-CSCF of described selection, and returns the subscription authentication data by UAA message to the S-CSCF of described selection;

Step 108, the S-CSCF of described selection chooses authentication vector, and sends 401 message to described I-CSCF and carry out authentication, carries the authentication vector of choosing in wherein said 401 message;

Step 109, described I-CSCF transmits 401 message to described P-CSCF;

Step 110, described P-CSCF transmits 401 message to described UE;

Step 111, described UE responds according to the authentication vector compute authentication in 401 message, and initiates register requirement again to described P-CSCF;

Step 112, described P-CSCF transmits register requirement to described I-CSCF;

Step 113, described I-CSCF receives register requirement, by UAR to described HSS inquiring user login state;

Step 114, described HSS checks user registration state, finds the local S-CSCF address of distributing for the user of having preserved, and then returns the S-CSCF address of described selection to described I-CSCF by UAA;

Step 115, described I-CSCF is according to the S-CSCF address of described selection, transmit register requirement to this selection S-CSCF;

Step 116, the S-CSCF of described selection detects Authentication Response, as the authentication success, then by the subscription data of SAR message to HSS request download user;

Step 117, described HSS upgrades user's registration information, and returns the S-CSCF of user's subscription data to described selection by SAA message;

Step 118, the S-CSCF of described selection returns the acknowledge message that succeeds in registration and gives described I-CSCF;

Step 119, described I-CSCF returns the acknowledge message that succeeds in registration and gives described P-CSCF;

Step 120, described P-CSCF returns the acknowledge message that succeeds in registration and gives described UE.

In the registration process of above-mentioned prior art, may there be following problem in fact:

When a plurality of terminals were registered same user, the first endpoint registration message was selected a S-CSCF at I-CSCF, and HSS preserves a S-CSCF address.If when process user is registered, handle at HSS before the MAR request of a S-CSCF, I-CSCF handles the registration message of second terminal, and being second endpoint registration, I-CSCF selects the 2nd S-CSCF, when such the 2nd S-CSCF handles second endpoint registration message, can preserve the 2nd S-CSCF address at HSS, and a S-CSCF address is covered, can cause like this:

First terminal can't receive the follow-up register and authentication request of this terminal in the location registration process of a S-CSCF, and its user data can be nullified by the network that HSS initiates and discharge.

The subsequent authentication registration message of first terminal is routed to the 2nd S-CSCF and registration failure.

Not only in user registration course, can there be above-mentioned problem, in other Business Processing process, also may there be same problem, as in conversation procedure when finding not registration but when unregistered state professional arranged of user, as shown in Figure 3, a kind of IMS process of controlling called conversation request comprises:

Step 201, the conversation request that the UE of called home network I-CSCF reception visited network sends;

Step 202, after described I-CSCF receives described conversation request, by LIR message to the HSS searching user's information;

Step 203, described HSS checks user's registration information and subscription data, finds that the user does not have the business of registering but unregistered state being arranged, and then returns the capability set of called home network S-CSCF to described I-CSCF by LIA message;

Step 204, described I-CSCF selects suitable S-CSCF according to the S-CSCF capability set that HSS returns, and transmits conversation request to selected S-CSCF;

Step 205, the S-CSCF of described selection receives conversation request, finds that the user is unregistered, then downloads subscription data by SAR message to the HSS request;

Step 206, HSS preserves the address of the S-CSCF of this selection, and returns the S-CSCF that the subscription authentication data are given described selection by SAA message;

At last, the S-CSCF of described selection preserves subscription data, and the process user session service.

In the conversation procedure of above-mentioned prior art, if find not registration but when unregistered state professional arranged, I-CSCF selected a S-CSCF for this user's first session service of user.If handle at HSS before the SAR request of a S-CSCF, I-CSCF handles second session service of this user terminal again, and I-CSCF selects the 2nd S-CSCF for this second session service, when such the 2nd S-CSCF handles second session service, meeting is in the address of the 2nd S-CSCF of HSS preservation, and the address of a S-CSCF covered, and initiate the network de-registration request to a S-CSCF session that the one S-CSCF sets up is discharged.

So, no matter be, when the user is unregistered, when two register requirement of I-CSCF processing or conversation request and priority have been selected two S-CSCF at user registration course or at conversation procedure, may cause the d/d mistake of session of first S-CSCF, thereby influence normal communication process.When I-CSCF handles more than two register requirement or session service request equally the problems referred to above can appear.

Summary of the invention

The embodiment of the invention discloses a kind of method, apparatus and system of distribution services CSCF, make in the IMS network, when there were at least two service request simultaneously in a user, effectively the distribution services CSCF made subsequent treatment normally to carry out.

The embodiment of the invention provides a kind of method of distribution services CSCF, and described method comprises:

Home subscriber server receives the request message of the preservation server address of query call conversation control function transmission, and described message comprises the service call conversation control function address that the query call conversation control function is selected for the user;

Home subscriber server checks whether this locality has preserved the service call conversation control function address for described user, if preservation is arranged, then home subscriber server returns to the query call conversation control function with the service call conversation control function address of described preservation; If do not preserve, home subscriber server is the service call conversation control function address that described user preserves described selection, and the service call conversation control function address of described selection is returned to the query call conversation control function.

The embodiment of the invention also provides a kind of method of distribution services CSCF, and described method comprises:

Home subscriber server receives the query requests that the query call conversation control function sends according to service request from user;

Home subscriber server checks according to described query requests whether this locality has preserved the service call conversation control function address for described user, if preservation is arranged, then the service call conversation control function address with described preservation returns to the query call conversation control function; If do not preserve, then home subscriber server is that described user selects a service call conversation control function, preserve the service call conversation control function address of described selection then for described user, and the service call conversation control function address of described selection is returned to the query call conversation control function.

The embodiment of the invention also provides a kind of system of distribution services CSCF, and described system comprises: query call conversation control function, home subscriber server;

Described query call conversation control function be used for selecting service call conversation control function according to the capability set of service call conversation control function, and described home subscriber server is issued in the service call conversation control function address that will select;

Described home subscriber server is used to check whether this locality is that the user has preserved the service call conversation control function address, if preservation is arranged, the query call conversation control function is given in the service call conversation control function address that then is returned as described user's preservation; If do not preserve, then home subscriber server is preserved the service call conversation control function address of described selection, and the query call conversation control function is given in the service call conversation control function address of returning described selection.

The embodiment of the invention also provides the system of another distribution services CSCF, and described system comprises: query call conversation control function, home subscriber server;

The query call conversation control function is used for sending query requests, carrying capacity demand information in the request message to described home subscriber server;

Described home subscriber server, be used to check whether promising described user has preserved the service call conversation control function address in this locality, if preservation is arranged, then the home subscriber server service call conversation control function address that is used for preserving returns to the query call conversation control function; If do not preserve, then home subscriber server is used for according to described ability need information and local ability information of preserving, from the service call conversation control function tabulation, select a service call conversation control function for the user, the service call conversation control function address of described selection is returned to the query call conversation control function, and preserve the service call conversation control function address of described selection for described user.

The embodiment of the invention also provides a kind of home subscriber server, and described home subscriber server comprises memory cell, second detecting unit, information interaction unit;

Memory cell is used to described user to preserve the capability set of service call conversation control function address information and service call conversation control function;

The information interaction unit, be used to receive the request message of the preservation server address that the query call conversation control function sends, described message comprises the service call conversation control function address that the query call conversation control function is selected for the user, and described message is sent to second detecting unit;

Second detecting unit, whether promising described user preserves the service call conversation control function address to be used to check memory cell; If preservation is arranged, then second detecting unit is used for the service call conversation control function address of preserving is returned to the inquiry service CSCF by the information interaction unit; If do not preserve, second detecting unit is used for the service call conversation control function address that the inquiry service CSCF is selected is returned to the inquiry service CSCF by the information interaction unit, and will be saved in described memory cell for the service call conversation control function that described user selects.

The embodiment of the invention also provides a kind of home subscriber server, and described home subscriber server comprises detecting unit, memory cell, selected cell, information interaction unit;

Memory cell is used to preserve the service call conversation control function tabulation and reaches the service call conversation control function address information of selecting for the user;

The information interaction unit is used to receive the query requests that the inquiry service CSCF sends, and described query requests is transmitted to detecting unit;

Detecting unit after being used to receive the described query requests of information interaction unit transmission, checks whether promising user preserves the service call conversation control function address in this locality; If preservation is arranged, the service call conversation control function address that detecting unit is used for preserving returns to the query call conversation control function by the information interaction unit; If for preserving, detecting unit is used for the service call conversation control function address that selected cell is selected is returned to the query call conversation control function, and will be saved in described memory cell for the service call conversation control function that described user selects;

Selected cell is used for selecting a service call conversation control function according to the service call conversation control function tabulation that ability need information is preserved from memory cell for the user.

Description of drawings

Fig. 1 is the IMS network architecture diagram that prior art provides;

Fig. 2 is the IMS that provides of prior art distributes S-CSCF when control user register requirement a method flow diagram;

Fig. 3 is that the IMS that prior art provides controls the method flow diagram that distributes S-CSCF when the user is called to be asked;

Fig. 4 is a kind of communication system architecture schematic diagram of preferable first embodiment provided by the invention;

Fig. 5 is the flow chart of a kind of S-CSCF of distribution of preferable second embodiment provided by the invention;

Fig. 6 is the flow chart that distributes S-CSCF in a kind of conversation procedure of preferable the 3rd embodiment provided by the invention;

Fig. 7 is the communication system that a kind of IMS of preferable the 4th embodiment provided by the invention distributes S-CSCF;

Fig. 8 is the flow chart that distributes S-CSCF in a kind of registration process of preferable the 5th embodiment provided by the invention;

Fig. 9 is the flow chart that distributes S-CSCF in a kind of conversation procedure of preferable the 6th embodiment provided by the invention.

Embodiment

For making the purpose, technical solutions and advantages of the present invention clearer, below in conjunction with embodiment and accompanying drawing, the present invention is further detailed explanation.

The present invention can be applicable to various need the distribution under the scene of S-CSCF, in registration scene, session service scene or messaging service scene process.But be the convenience of describing, following embodiment only initiates register requirement with the user and user's initiation session service request process is that example describes.

As shown in Figure 4, be a kind of communication system architecture schematic diagram of preferable first embodiment of the present invention, this communication system comprises: be positioned at UE41, the P-CSCF42 of visited network, be positioned at I-CSCF43, S-CSCF44, the HSS45 of home network.

Wherein, I-CSCF43 further comprises selected cell 431 and information interaction unit 432; HSS45 further comprises first detecting unit 450, memory cell 451, information interaction unit 452, second detecting unit 453.

When Fig. 4 application scenarios was initiated register requirement for the user, the groundwork process of above-mentioned communication system can be as described below:

UE41 initiates register requirement to P-CSCF42; P-CSCF42 obtains the I-CSCF43 address from described registration information, and transmits the information interaction unit 432 of register requirement to I-CSCF43.

Information interaction unit 432 receives described register requirement, and the UAR message by the login state query script is to the login state of HSS45 inquiring user UE41.

The information interaction unit 452 of HSS45 receives described UAR message, and first detecting unit 450 detects described user UE41 according to described UAR message to memory cell 451 and whether preserved the S-CSCF address of distributing for described user UE41.If preservation is arranged, then first detecting unit, 450 announcement information interactive unit 452 are returned the S-CSCF address of this distribution, the S-CSCF that the information interaction unit 432 route register requirement of I-CSCF43 are assigned with to this by UAA message to I-CSCF43.If described first detecting unit 450 checks that user UE41 does not preserve, then first detecting unit, 450 announcement information interactive unit 452 are given described I-CSCF43 by UAA message to the capability set that I-CSCF43 returns S-CSCF.

The information interaction unit 432 of I-CSCF43 is transmitted to selected cell 431 with the capability set of described S-CSCF, selected cell 431 is selected suitable S-CSCF according to the capability set of described S-CSCF, as select S-CSCF44, information interaction unit 432 is sent to the information interaction unit 452 of described HSS45 by the S-CSCF44 address that will select of SSR message (described SSR message is a kind of request message of preserving server address) of preserving the server address process then.

Second detecting unit 453 is passed to the S-CSCF44 address of described selection after obtaining the S-CSCF44 address of described selection according to SSR message in described information interaction unit 452.Second detecting unit 453 checks whether in the memory cell 451 be that described user has preserved the S-CSCF address information, if preservation is arranged, then I-CSCF43 is given by the S-CSCF address that SSA message is returned as described user's preservation in information interaction unit 452.If do not preserve, then described memory cell 451 is preserved the S-CSCF44 address of these selections, the user of correspondence is changed to distribution state, and starts a protection timer; Then, I-CSCF43 is given by the S-CSCF44 address that SSA returns described selection in information interaction unit 452.

Information interaction unit 432 is according to the described S-CSCF address of returning, and this S-CSCF that returns as the S-CSCF that distributes to the user, and is transmitted register requirement to the described S-CSCF that distributes to the user.

The described user's of distributing to S-CSCF receives described register requirement, and discovery is first registration, then obtains registered user's authentication collection to described HSS45 by MAR message.

Information interaction unit 452 obtains registered user's authentication collection from memory cell 451, upgrades state of user, stops to protect timer, and returns the subscription authentication data by MAA message to the described user's of distributing to S-CSCF.

The described user's of distributing to S-CSCF chooses authentication vector, and sends 401 message to described information interaction unit 432, carries the authentication vector of choosing in wherein said 401 message; 401 message are transmitted to described P-CSCF42 in the information interaction unit 432 of described I-CSCF43; Described P-CSCF42 transmits 401 message to described UE41; Described UE41 responds according to the authentication vector compute authentication in 401 message, and initiates register requirement again to described P-CSCF42.

Described P-CSCF42 transmits the information interaction unit 432 of register requirement to described I-CSCF43; Described information interaction unit 432 receives register requirement, by UAR message to described HSS45 inquiring user UE41 login state.

The information interaction unit 452 of described HSS45 receives UAR message, described first detecting unit 450 takes out the described S-CSCF address of distributing to the user according to described UAR message to memory cell 451, and information interaction unit 452 returns the information interaction unit 432 of the described user's of distributing to S-CSCF address to described I-CSCF43 by UAA message; Register requirement is transmitted to the described S-CSCF that distributes to the user according to the described S-CSCF address of distributing to the user in described information interaction unit 432.

The described S-CSCF that distributes to the user detects Authentication Response, as the authentication success, then downloads subscription data by SAR message to the HSS request.After HSS receives request, upgrade the log-on message and the state of user of memory cell 451 among the described HSS45.

Described information interaction unit 452 obtains user's subscription data and returns the S-CSCF of user's subscription data to the described user of distributing to by SAA message from memory cell 451;

The described user's of distributing to S-CSCF returns the acknowledge message that succeeds in registration and gives described I-CSCF43; Described I-CSCF43 returns the acknowledge message that succeeds in registration and gives described P-CSCF42; Described P-CSCF42 returns the acknowledge message that succeeds in registration and gives described user UE41.

If when described protection timer expiry, then HSS45 removes the service call conversation control function address of being preserved from memory cell 451.

Above-mentioned communication system not only can be applied to the scene of register requirement, can also be applied to session service request scene.When being applied to the session service request, the groundwork process of above-mentioned communication system can be as described below:

The information interaction unit 432 of called home network I-CSCF43 receives the conversation request of called subscriber UE41 from the caller network; Described information interaction unit 432 passes through the LIR message of position enquiring process to HSS45 inquiring user UE41 information.

The information interaction unit of described HSS45 receives described LIR message, and first detecting unit 450 is checked user's UE41 log-on message and subscription data according to described LIR message to described memory cell 451, and testing result is fed back to information interaction unit 452.If first detecting unit 450 finds that user UE41 does not have the business of registering but unregistered state being arranged, in addition, if the S-CSCF address has been preserved for described user UE41 in this locality, then information interaction unit 452 returns the S-CSCF address of described preservation to I-CSCF43 by LIA message; If being described user UE41, this locality do not preserve the S-CSCF address, then information interaction unit 452 returns the capability set of S-CSCF by LIA message to the information interaction unit 432 of I-CSCF43, and described information interaction unit 432 is transmitted the capability set of described S-CSCF and given selected cell 431.

Described selected cell 431 is selected suitable S-CSCF according to the S-CSCF capability set that returns, as select S-CSCF44, then, information interaction unit 432 sends SSR message to the information interaction unit 452 of HSS45, and described SSR message is carried the S-CSCF44 address of this selection.

Information interaction unit 452 obtains the S-CSCF address of described selection according to SSR message, and the S-CSCF address of described selection passed to second detecting unit 454, second detecting unit 454 checks whether promising described user has preserved the S-CSCF address in the memory cell 451, and testing result is fed back to information interaction unit 452.If the S-CSCF address has been preserved for described user in first detecting unit, 450 detection of stored unit 451, then the S-CSCF address that will preserve, information interaction unit 452 returns to the information interaction unit 432 of I-CSCF43 by SSA message, selected cell 431 with the described S-CSCF address of returning as the S-CSCF that distributes to described user.If memory cell 451 is not preserved the S-CSCF address for described user, memory cell 451 is preserved the S-CSCF44 address of described selection, the user of correspondence is changed to distribution state, and starts the protection timer.Information interaction unit 452 returns to information interaction unit 432 with the S-CSCF44 address of described selection by SSA message, selected cell 431 with the described S-CSCF44 that returns as the S-CSCF that distributes to described user.

Conversation request is transmitted to the described S-CSCF that distributes to described user in information interaction unit 432.The described S-CSCF that distributes to described user receives conversation request, finds that user UE41 is unregistered, then downloads subscription data by SAR message to memory cell 451 requests of HSS45, and HSS45 upgrades User Status, and stops to protect timer.Information interaction unit 452 obtains the subscription data of user UE41 and gives the described S-CSCF that distributes to described user by the subscription data that SAA message is returned user UE41 from memory cell 451 then.

The described S-CSCF that distributes to described user preserves subscription data, and the process user session service.

In the foregoing description, after I-CSCF43 selects a S-CSCF, increase a process (Save-Server Name-Request/Answer who preserves server address, SSR/SSA), then HSS45 handles when distributing the S-CSCF request, preserved the S-CSCF address if find for the user, then the memory cell 451 of HSS45 is no longer preserved new S-CSCF address, but I-CSCF43 is issued in the S-CSCF address that will preserve, so can avoid when the another one terminal is carried out second register requirement to this user UE41 or when two conversation request are arranged simultaneously, HSS45 can carry out S-CSCF according to the S-CSCF address of whether preserving distribution and distribute, if preservation is arranged, continue to distribute this S-CSCF that has preserved then for second register requirement or second conversation request; If do not preserve, then preserve newly assigned S-CSCF address.Therefore, can not produce and cover chaotic problem, can guarantee normally carrying out of communication.

As shown in Figure 5, be a kind of flow chart that distributes S-CSCF of preferable second embodiment of the present invention.When application scenarios was initiated register requirement for the user, the specific implementation process of this second embodiment mainly comprised:

Step 301, the UE that is positioned at visited network initiates register requirement to the P-CSCF of visited network;

Step 302, described P-CSCF obtains the I-CSCF address of user attaching network from registration information, and transmits register requirement to this I-CSCF;

Step 303a, described I-CSCF receives register requirement, initiates the user registration state query requests by UAR message to the HSS of home network;

After step 303b, this HSS receive described UAR message, check whether itself preserves the S-CSCF address of having distributed for described user UE.If preservation is arranged, then HSS returns the S-CSCF address of described preservation by UAA message to the user, and I-CSCF route register requirement is to the S-CSCF of described preservation.If do not preserve, then described HSS returns the capability set of home network S-CSCF to I-CSCF by UAA message.

Step 304a, described I-CSCF selects suitable S-CSCF according to the capability set of S-CSCF, and is sent to described HSS by the S-CSCF address that SSR message will be selected;

After step 304b, described HSS obtain the S-CSCF address of described selection according to SSR message, check whether this locality is that described user has preserved the S-CSCF address, if preserve, then described HSS gives I-CSCF by the S-CSCF address that SSA returns this preservation.

If do not preserve, then described HSS preserves the S-CSCF address of this selection, and the user of correspondence is changed to distribution state, starts the protection timer, and gives I-CSCF by the S-CSCF address that SSA returns this selection;

Step 305, register requirement as the S-CSCF that distributes to described user UE, and is transmitted to the described S-CSCF that distributes to described user UE with this S-CSCF that returns in the S-CSCF address that described I-CSCF returns according to HSS;

Step 306, the described S-CSCF that distributes to described user UE receives register requirement, and discovery is first registration, then obtains registered user's authentication collection to described HSS by MAR message;

Step 307, described HSS returns the subscription authentication data by MAA message to the described S-CSCF that distributes to described user UE, and upgrades state of user, stops to protect timer;

Step 308, the S-CSCF of described distribution chooses authentication vector, and sends 401 message to described I-CSCF and carry out authentication, carries the authentication vector of choosing in wherein said 401 message;

Step 309, described I-CSCF transmits 401 message to described P-CSCF;

Step 310, described P-CSCF transmits 401 message to described UE;

Step 311, described UE responds according to the authentication vector compute authentication in 401 message, and initiates register requirement again to described P-CSCF;

Step 312, described P-CSCF transmits register requirement to described I-CSCF;

Step 313, described I-CSCF receives register requirement, by UAR message to described HSS inquiring user login state;

Step 314, described HSS checks user registration state, if HSS has preserved the S-CSCF address of distributing to described user UE for described user, then returns the described S-CSCF address of distributing to described user UE by UAA message and gives described I-CSCF;

Step 315, described I-CSCF transmits register requirement to the described S-CSCF that distributes to described user UE according to the described S-CSCF address of distributing to described user UE;

Step 316, the described S-CSCF that distributes to described user UE checks Authentication Response, as the authentication success, then asks the download user CAMEL-Subscription-Information by SAR message to HSS;

Step 317, described HSS upgrades user's log-on message and User Status, and returns user's subscription data to the described S-CSCF that distributes to described user UE by SAA message;

Step 318, the described S-CSCF that distributes to described user UE returns the acknowledge message that succeeds in registration and gives described I-CSCF;

Step 319, described I-CSCF returns the acknowledge message that succeeds in registration and gives described P-CSCF;

Step 320, described P-CSCF returns the acknowledge message that succeeds in registration and gives described UE.

Among above-mentioned second embodiment: after I-CSCF selects a S-CSCF, increase a process of preserving the S-CSCF address, be used for the S-CSCF address of this selection is saved in HSS, this process at user registration state query script (step 303b) afterwards.When then HSS treatment S SR asks, preserved the S-CSCF address if find for described user, then HSS is in response message SSA message, give I-CSCF with the S-CSCF address strap of described preservation, so can avoid when the another one terminal is carried out second register requirement to this user, whether the HSS basis preserves the S-CSCF address that this user is distributed is carried out the S-CSCF distribution, if preserve, continues this S-CSCF that has preserved of distribution then for second register requirement; If no, then redistribute and preserve newly assigned S-CSCF address.Therefore, can not produce and cover chaotic problem, can guarantee normally carrying out of communication.

The present invention not only initiates can use in the register requirement process the user, also can use under other need distribute the scene of S-CSCF, as in the session service request process.

As shown in Figure 6, for distributing the flow chart of S-CSCF in a kind of conversation procedure of preferable the 3rd embodiment of the present invention, when application scenarios initiated a session request for the user, the specific implementation process of the 3rd embodiment comprised:

Step 401, called home network I-CSCF receives the conversation request of called subscriber UE from the caller network;

Step 402a, described I-CSCF pass through LIR message to the HSS searching user's information;

Step 402b, described HSS checks user's registration information and subscription data, find that the user not have the business of registering but unregistered state being arranged, if the S-CSCF address has been preserved for described user UE in this locality, then the HSS S-CSCF address of returning described preservation by LIA message returns to described I-CSCF; Do not preserve the S-CSCF address if this locality is described user UE, then HSS returns called home network S-CSCF capability set by LIA message to described I-CSCF;

Step 403a, described I-CSCF selects suitable S-CSCF according to the S-CSCF capability set that HSS returns, and sends the S-CSCF address of this selection to HSS by SSR message;

Step 403b, after HSS obtains the S-CSCF address of described selection according to SSR message, check local S-CSCF address information of preserving, if the S-CSCF address has been preserved for described user in this locality, HSS returns to I-CSCF with the S-CSCF address of described preservation by SSA message; If local do not have to preserve, then preserve the S-CSCF address of described selection, the user is changed to distribution state, start the protection timer, and the S-CSCF address of described selection is returned to I-CSCF by SSA message;

Step 404, the S-CSCF address that I-CSCF returns according to HSS as the S-CSCF that distributes to user UE, and forwards the request to the S-CSCF of the described user of distributing to UE with this S-CSCF;

Step 405, the described S-CSCF that distributes to user UE receives conversation request, finds that the user is unregistered, then downloads subscription data by SAR message to the HSS request;

Step 406, HSS upgrades state of user, stops to protect timer, and returns the S-CSCF that user contracting data is given the described user of distributing to UE by SAA message;

At last, the described S-CSCF that distributes to user UE preserves subscription data, and the process user session service.

Among above-mentioned the 3rd embodiment: after I-CSCF selects a S-CSCF, increase a process of preserving the S-CSCF address, be used for the S-CSCF address of this selection is saved in HSS, this process at customer location query script (step 402b) afterwards.When then HSS handles conversation request, preserved the S-CSCF address if find for described user, then HSS no longer preserves new S-CSCF address, but the S-CSCF address strap that will preserve is given I-CSCF, so can avoid when the another one terminal is carried out second conversation request to this user, whether the HSS basis preserves the S-CSCF address that this user is distributed is carried out the S-CSCF distribution, if preservation is arranged, continues this S-CSCF that has preserved of distribution then for second conversation request; If no, then redistribute and preserve newly assigned S-CSCF address.Therefore, can not produce and cover chaotic problem, can guarantee normally carrying out of communication.

The present invention also provides preferable the 4th embodiment, provide the communication system that another distributes S-CSCF, among the 4th embodiment, carry out S-CSCF selection and preservation by HSS, specifically as shown in Figure 7, this communication system comprises: be positioned at UE71, the P-CSCF72 of visited network, be positioned at I-CSCF73, S-CSCF74, the HSS75 of home network.

Wherein, HSS75 further comprises detecting unit 750, memory cell 751, selected cell 752, information interaction unit 753.

This preferable the 4th embodiment course of work is similar substantially to preferable first embodiment, only in the 4th embodiment, select S-CSCF in HSS, to carry out, specific as follows described, when application scenarios was initiated register requirement for the user, the groundwork process of above-mentioned communication system can be as described below:

UE71 initiates register requirement to P-CSCF72; Described P-CSCF72 obtains the I-CSCF73 address of user attaching network from registration information, and transmits register requirement to I-CSCF73.

Described I-CSCF73 receives register requirement, initiate query requests by UAR message to HSS75, query requests is carried relevant ability need information, described relevant ability need information specifically comprises the ability information of S-CSCF and/or availability information and/or the network topological information of S-CSCF, but is not limited to these information.

The information interaction unit 753 of described HSS75 receives described UAR message, and detecting unit 750 detects whether preserved the S-CSCF address for described user according to described UAR message to memory cell 751.

If detecting unit 750 detects this locality and has preserved the S-CSCF address for described user, then detecting unit 750 announcement information interactive unit 753 by UAA message to S-CSCF address that I-CSCF73 returns described preservation (for example, the S-CSCF74 address), I-CSCF73 route register requirement is to the S-CSCF74 of described preservation.

If described detecting unit 750 is checked this locality and is not preserved the S-CSCF address for described user, the selected cell 752 ability need information and the local S-CSCF ability information of preserving of carrying according to described UAR then, from the S-CSCF tabulation of preserving, select a suitable S-CSCF, as selecting S-CSCF74.Memory cell 751 is changed to a distribution state with described user, and starts the protection timer for the S-CSCF74 address that described user preserves described selection.Then, selected cell 752 is passed to information interaction unit 753 with the S-CSCF74 address of described selection, and I-CSCF73 is given in the S-CSCF74 address that information interaction unit 753 returns described selection by UAA message.

Described I-CSCF73 transmits the S-CSCF74 of register requirement to described selection according to the S-CSCF74 address of the described selection that UAA message is returned, the S-CSCF74 of described selection receives described register requirement, discovery is first registration, then obtains registered user's authentication collection to described HSS75 by MAR message.

After information interaction unit 753 receives described MAR message, obtain registered user's authentication collection, upgrade state of user, stop to protect timer, and return the subscription authentication data to described S-CSCF74 by MAA message from memory cell 751.

Described S-CSCF74 chooses authentication vector, and sends 401 message to described I-CSCF73, carries the authentication vector of choosing in wherein said 401 message; Described I-CSCF73 transmits 401 message to described P-CSCF72; Described P-CSCF72 transmits 401 message to described UE71; Described UE71 responds according to the authentication vector compute authentication in 401 message, and initiates register requirement again to described P-CSCF72.

Described P-CSCF72 transmits register requirement to described I-CSCF73, and described I-CSCF73 passes through UAR message to described HSS75 inquiring user UE71 login state.

Described HSS75 checks user registration state, if the memory cell of HSS75 751 has been preserved the S-CSCF address for described user, then information interaction unit 753 returns the S-CSCF address of described preservation to described I-CSCF73 by UAA message;

Described I-CSCF73 is according to the described S-CSCF address of returning, and the described S-CSCF of returning as the S-CSCF that distributes to user UE71, and is transmitted register requirement to the described S-CSCF that distributes to user UE71.

The described S-CSCF that distributes to user UE71 checks Authentication Response, and as the authentication success, the then described S-CSCF that distributes to user UE71 asks the download user subscription data by SAR message to HSS75.

HSS75 upgrades the user's registration information of memory cell 751 among the described HSS75, and described information interaction unit 753 obtains the subscription data of user UE71 and returns the S-CSCF of the subscription data of user UE71 to the described user of distributing to UE71 by SAA message from memory cell 751;

The S-CSCF of the described user of distributing to UE71 returns the acknowledge message that succeeds in registration and gives described I-CSCF73; Described I-CSCF73 returns the acknowledge message that succeeds in registration and gives described P-CSCF72; Described P-CSCF72 returns the acknowledge message that succeeds in registration and gives described user UE71.

If when described protection timer expiry, then HSS75 removes the service call conversation control function address of being preserved from memory cell 751.

To be communication system initiate the course of work of register requirement when professional the user to foregoing description, and when above-mentioned communication system applications during in user's initiation session service request, its groundwork process can be as described below:

The conversation request that the UE71 of the I-CSCF73 reception visited network of home network sends, described I-CSCF73 passes through LIR message to the HSS75 searching user's information, and, carry relevant ability need information in the LIR message.Ability need information specifically comprises the ability information of S-CSCF and/or availability information and/or the network topological information of S-CSCF, but is not limited to these information.

The information interaction unit 753 of HSS75 receives described LIR message, described LIR message is passed to detecting unit 750, detecting unit 750 is checked user's registration information and subscription data according to described LIR message to memory cell 751, and testing result is fed back to information interaction unit 753.

If finding user UE71, detecting unit 750 do not have the business of registering but unregistered state being arranged, the S-CSCF address (has for example been preserved for described user UE71 in detecting unit 750 detection of stored unit 751 in addition, the S-CSCF74 address), then information interaction unit 753 returns to I-CSCF73 by LIA message with this S-CSCF74 address; If finding user UE71, detecting unit 750 do not have the business of registering but unregistered state being arranged, in addition, detecting unit 750 detection of stored unit 751 do not save as the S-CSCF address that user UE71 distributes, the selected cell 752 ability need information and the local S-CSCF ability information of preserving of carrying according to LIR then, from the S-CSCF tabulation that memory cell 751 is preserved, select a suitable S-CSCF, for example select S-CSCF74.Then; memory cell 751 is preserved described S-CSCF74 address for described user UE71; the user ID of correspondence is changed to a distribution state, and starts the protection timer, information interaction unit 753 returns the S-CSCF74 address of described selection to described I-CSCF73 by LIA message then.

Conversation request as the S-CSCF that distributes to user UE71, and is transmitted to the described S-CSCF that distributes to user UE71 with this S-CSCF that returns in the S-CSCF address that I-CSCF73 returns according to LIA message.

The described S-CSCF that distributes to user UE71 receives conversation request, finds that the user is unregistered, then downloads subscription data by SAR message to the HSS75 request;

Described HSS75 upgrades state of user, stops to protect timer, and returns the S-CSCF that user contracting data is given described distribution by SAA message;

At last, described S-CSCF74 preserves subscription data, and the process user session service.

As shown in Figure 8, for distributing the flow chart of S-CSCF in a kind of registration process of preferable the 5th embodiment of the present invention, when application scenarios was initiated register requirement for the user, the specific implementation process of the 5th embodiment comprised:

Step 501, UE initiates register requirement to P-CSCF;

Step 502, described P-CSCF obtains the I-CSCF address of user attaching network from registration information, and transmits register requirement to this I-CSCF;

Step 503, described I-CSCF receives register requirement, and to the HSS of home network inquiring user login state, this UAR message is carried relevant ability need information by UAR message;

Step 504, HSS checks the local S-CSCF address whether promising described user UE preserves.If preservation is arranged, then HSS returns the S-CSCF address of described preservation to described I-CSCF, and I-CSCF route register requirement is to the S-CSCF of described preservation.

If do not preserve, then HSS selects a suitable S-CSCF according to ability need information and local S-CSCF ability information of preserving that UAR carries from the S-CSCF tabulation that preserve this locality.HSS preserves this selecteed S-CSCF address, and the user of correspondence is changed to distribution state, and starts the protection timer, and described then HSS returns this selecteed S-CSCF address by UAA message to described I-CSCF;

Step 505, the S-CSCF address that described I-CSCF returns according to UAR as the S-CSCF that distributes, is transmitted the S-CSCF of register requirement to described distribution with this S-CSCF;

Step 506, the S-CSCF of described distribution receives register requirement, and discovery is first registration, obtains registered user's authentication collection to described HSS by MAR;

Step 507, described HSS upgrades corresponding state of user, stops to protect timer, and returns the subscription authentication data by MAA message to the S-CSCF of described distribution;

Step 508, the S-CSCF of described distribution chooses authentication vector, and sends 401 message to described I-CSCF and carry out authentication, carries the authentication vector of choosing in wherein said 401 message;

Step 509, described I-CSCF transmits 401 message to described P-CSCF;

Step 510, described P-CSCF transmits 401 message to described user UE;

Step 511, described UE responds according to the authentication vector compute authentication in 401 message, and initiates register requirement again to described P-CSCF;

Step 512, described P-CSCF transmits register requirement to described I-CSCF;

Step 513, described I-CSCF receives register requirement, by UAR message to described HSS inquiring user login state;

Step 514, described HSS checks user registration state, if HSS has preserved the S-CSCF address for described user, then returns the S-CSCF address of described distribution to described I-CSCF by UAA message;

Step 515, described I-CSCF transmits the S-CSCF of register requirement to described distribution according to the S-CSCF address of described distribution;

Step 516, the S-CSCF of described distribution detects Authentication Response, as the authentication success, sends SAR message to HSS, the subscription data of request download user;

Step 517, described HSS upgrades described user's log-on message, and returns user's subscription data to the S-CSCF of described distribution by SAA message;

Step 518, the S-CSCF of described distribution returns the acknowledge message that succeeds in registration and gives described I-CSCF;

Step 519, described I-CSCF returns the acknowledge message that succeeds in registration and gives described P-CSCF;

Step 520, described P-CSCF returns the acknowledge message that succeeds in registration and gives described UE.

The present invention not only can use in the register requirement process, also can use under other need distribute the scene of S-CSCF, as in the session service request process.

As shown in Figure 9, for a kind of conversation procedure of preferable the 6th embodiment of the present invention distributes the flow chart of S-CSCF, when application scenarios was user's initiation session service request, the specific implementation process of the 6th embodiment comprised:

Step 601, the conversation request that the UE of called home network I-CSCF reception visited network sends;

Step 602, described I-CSCF to the HSS searching user's information, carries relevant ability need information by LIR message in the LIR message;

Step 603, described HSS receives described LIR message, check user's registration information and subscription data, find that the user does not have the business of registering but unregistered state being arranged, and HSS has preserved the S-CSCF address for described user, and then HSS returns to described I-CSCF with the S-CSCF address of described preservation by LIA message.If HSS checks this locality and does not preserve the S-CSCF address for described user that then HSS selects a suitable S-CSCF according to ability need information and local S-CSCF ability information of preserving that LIR carries from the S-CSCF tabulation that preserve its this locality.HSS is that described user preserves this selecteed S-CSCF address, and the user of correspondence is changed to distribution state, and starts the protection timer, returns this selecteed S-CSCF address by LIA message then and gives I-CSCF;

Step 604, conversation request as the S-CSCF that distributes to user UE, is transmitted to the described S-CSCF that distributes to user UE with this S-CSCF in the S-CSCF address that described I-CSCF returns according to LIA message;

Step 605, the described S-CSCF that distributes to user UE receives conversation request, finds that the user is unregistered, then downloads subscription data by SAR message to the HSS request, carries the S-CSCF address of described distribution in the described SAR message;

Step 606, HSS upgrades state of user, stops to protect timer, and returns the S-CSCF that user contracting data is given the described user of distributing to UE by SAA message;

By the specific implementation process of the invention described above embodiment as can be seen, in the embodiment of the invention, when HSS distributes the S-CSCF request for the user handles, preserve a S-CSCF address for this user if find, then HSS no longer preserves new S-CSCF address, but I-CSCF is issued in the S-CSCF address that will preserve, does not preserve the S-CSCF address for this user if find, then after selecting a S-CSCF, increase a process of preserving the S-CSCF server address.So can avoid when the another one terminal is carried out second register requirement to this user UE or when two conversation request are arranged simultaneously, whether the HSS basis preserves the S-CSCF address of promising this user's distribution is carried out the S-CSCF distribution, if preservation is arranged, continue to distribute this S-CSCF that has preserved then for second register requirement or second conversation request; If no, then redistribute and preserve newly assigned S-CSCF address.Therefore, can not produce and distribute S-CSCF to cover chaotic problem, can guarantee normally carrying out of communication.

But above-mentioned only is better embodiment of the present invention; be not to be used to limit protection scope of the present invention; any those skilled in the art of being familiar with will be appreciated that; all within the spirit and principles in the present invention scope; any modification of being done, equivalence replacement, improvement etc. all should be included within the scope of the present invention.

Claims

1, a kind of method of distribution services CSCF is characterized in that, comprises the steps:

2, the method for claim 1 is characterized in that, this method also comprises:

After the query call conversation control function receives service request from user, send query requests to home subscriber server;

If home subscriber server is not preserved the service call conversation control function address for described user according to described query requests inspection this locality, then home subscriber server returns the capability set of service call conversation control function to the query call conversation control function;

Then described query call conversation control function is specially for the service call conversation control function that the user selects, the service call conversation control function that described query call conversation control function is selected for the user according to the capability set of service call conversation control function.

3, the method for claim 1 is characterized in that, described home subscriber server is after described user preserves the service call conversation control function address of described selection, and this method further comprises described user is changed to a distribution state.

4, a kind of method of distribution services CSCF is characterized in that, this method comprises:

5, method as claimed in claim 4, it is characterized in that, the ability need information of carrying in the query requests of described home subscriber server according to described query call conversation control function transmission, and the ability information of the local service call conversation control function of preserving, for the user selects a service call conversation control function.

6, method as claimed in claim 4 is characterized in that, described home subscriber server is after described user preserves the service call conversation control function address of described selection, and this method further comprises described user is changed to a distribution state.

7, a kind of communication system of distribution services CSCF is characterized in that, this communication system comprises: query call conversation control function, home subscriber server;

8, communication system as claimed in claim 7 is characterized in that, described query call conversation control function further comprises selected cell, is used for selecting service call conversation control function according to the capability set of service call conversation control function.

9, communication system as claimed in claim 8 is characterized in that, described home subscriber server further comprises memory cell, second detecting unit, information interaction unit;

The information interaction unit, be used to receive the request message of the preservation server address that the query call conversation control function sends, comprise the service call conversation control function address that described query call conversation control function is selected for the user in the described message, and described message is sent to second detecting unit;

Second detecting unit, whether promising described user preserves the service call conversation control function address to be used to check memory cell; If preservation is arranged, second detecting unit is used for the service call conversation control function address of preserving is returned to the inquiry service CSCF by the information interaction unit; If do not preserve, second detecting unit is used for the service call conversation control function address that the inquiry service CSCF is selected is returned to the inquiry service CSCF by the information interaction unit, and will be saved in described memory cell for the service call conversation control function that described user selects.

10, communication system as claimed in claim 9 is characterized in that, described attribution server further comprises:

First detecting unit, whether promising user preserves the service call conversation control function address to check memory cell to be used for the query requests that sends according to the inquiry service CSCF, if preservation is arranged, then the service call conversation control function address with described preservation returns to the inquiry service CSCF by described information interaction unit; If preserve, then return the capability set of service call conversation control function to the inquiry service CSCF by the information interaction unit.

11, a kind of communication system of distribution services CSCF is characterized in that, this communication system comprises: query call conversation control function, home subscriber server;

12, communication system as claimed in claim 11 is characterized in that, described home subscriber server further comprises memory cell, information interaction unit, detecting unit, selected cell;

Selected cell is used for selecting a service call conversation control function according to the service call conversation control function tabulation that ability need information is preserved from memory cell for the user;

Detecting unit after being used to receive the described query requests of information interaction unit transmission, checks whether promising user preserves the service call conversation control function address in this locality; If preservation is arranged, the service call conversation control function address that detecting unit is used for preserving returns to the query call conversation control function by the information interaction unit; If do not preserve, detecting unit is used for the service call conversation control function address that selected cell is selected is returned to the query call conversation control function, and will be saved in described memory cell for the service call conversation control function that described user selects;

13, a kind of home subscriber server is characterized in that, described home subscriber server comprises memory cell, second detecting unit, information interaction unit;

14, want 13 described home subscriber servers as right, it is characterized in that, described home subscriber server further comprises:

First detecting unit, whether promising user preserves the service call conversation control function address to check memory cell to be used for the query requests that sends according to the inquiry service CSCF, if preservation is arranged, then the service call conversation control function address with described preservation returns to the inquiry service CSCF by described information interaction unit; If do not preserve, then return the service call conversation control function capability set and give the inquiry service CSCF by the information interaction unit.

15, a kind of home subscriber server is characterized in that, this home subscriber server comprises memory cell, information interaction unit, detecting unit, selected cell;