CN101577895B - User registration method for IP multimedia subsystem network - Google Patents

Abstract

The invention provides a user registration method for an IP multimedia subsystem network. The method comprises the following steps that: after S-CSCF receives a registration request of a user, if judging that the user is unregistered currently, the S-CSCF sends a user data configuration request carrying an initial registration mark to HSS; after receiving a user data configuration failure responseof which the failure reason is the inconsistent state and which is returned by the HSS, the S-CSCF sends the user data configuration request carrying a refresh registration mark to the HSS; and after receiving a user data configuration success response returned by the HSS, the S-CSCF completes following user registration operations. The method solves the problem that when the user initiates the r efresh registration in the conditions that the user data are lost due to restarting or fault of the S-CSCF or the user data do not exist when the S-CSCF is reselected, the user cannot successfully complete the refresh registration due to inconsistent user registration states of the S-CSCF and the HSS.

Description

A kind of user registering method of IP Multimedia System network

Technical field

The present invention relates to the communications field, relate in particular to the user registering method of a kind of IP (Internet Protocol, Internet protocol) multi-media subsystem network.

Background technology

IP Multimedia System (IP Multimedia Core Network Subsystem is called for short IMS) is the core of communication network of new generation.Fig. 1 has described network element entity and annexation thereof relevant with the present invention in the IMS architecture.Wherein:

The terminal equipment that subscriber equipment (User Equipment is called for short UE) 101 representative of consumer are used;

CSCF (Call Session Control Function, be called for short CSCF) be the core network element of control conversation procedure, comprise: Proxy Call Session Control Function (Proxy-CSCF, be called for short P-CSCF) 102, query call conversation control function (Interrogating-CSCF, be called for short I-CSCF) 103, service call conversation control function (Serving-CSCF is called for short S-CSCF) 104;

Home subscriber server (Home Subscriber Server is called for short HSS) the 105th, the main storage server of all data relevant with user and server among the IMS;

Application server (Application Server is called for short AS) 106 provides the network element of increment multimedia service.

Between each network element illustrated in fig. 1, UE links to each other with P-CSCF by Gm; Realize interconnection by Mw between P-CSCF, I-CSCF, S-CSCF; HSS links to each other with I-CSCF, S-CSCF by Cx interface, links to each other with AS by Sh interface; S-CSCF links to each other with AS by ISC (IMS service control, IMS Service control) interface.

P-CSCF is linked into the entrance network element of IMS system as the user, and no matter all session initiation protocols (Session Initiation Protocol is called for short SIP) signaling still issues UE from UE, all must be through P-CSCF.When UE after IMS network registry success, P-CSCF preserves the contact address of UE, public user identity (the Public User Identity of UE in this locality, abbreviation PUI), the private user identity of UE (Private User Identity is called for short PVI).

S-CSCF is the core network element of IMS, is positioned at home network, for UE carries out session control and registration service is provided.When UE was in the session, S-CSCF processed the session status in the network.When UE after IMS network registry success, S-CSCF preserves in this locality: UE is registered to the information such as the network ID (identifier) of the employed P-CSCF of IMS network, the IP address of P-CSCF, the contact address of UE, the public user identity (PUI) of UE, the private user identity (PVI) of UE, the corresponding user's configuration data of public user identity of UE, the HSS address of preserving the UE login state or title.

HSS is all data storage cores relevant with user and server in the IMS system, not only preserves user's static data relevant with server, and preserves some dynamic data.When UE after IMS network registry success, HSS preserves S-CSCF address or the title of distributing to UE.

UE at first will be registered to the IMS territory before wanting to use the abundant business function that IMS provides, and after UE succeeded in registration, the IMS network was that UE has distributed P-CSCF, S-CSCF.And after UE succeeded in registration, some data and state in that P-CSCF, S-CSCF, HSS are safeguarding the user wherein had the state of a very important UE to be exactly: the login state of the UE that safeguards on S-CSCF, HSS.

In the current agreement, user's login state has following four kinds:

A) unregistered (Not Registered): show that the user is unregistered and do not distribute S-CSCF;

B) authentication unsettled (Authentication Pending): show that the user is in the intermediateness in the authentication process and is assigned S-CSCF;

C) registered (Registered): show that the user has registered and be assigned S-CSCF;

D) non-registered (Unregistered): show that the user is unregistered but be assigned S-CSCF; This state mainly is to use during called in the signatory situation that non-login service arranged of user.

After UE successfully was registered to the IMS network, on the S-CSCF and HSS that distribute for this UE, the login state of the UE of maintenance was: registered.

Under normal circumstances, the login state of the UE that safeguards on S-CSCF and the HSS is identical.Keeping the upper synchronous method of UE login state of S-CSCF and HSS is exactly periodically refresh registration of UE.

IMS user at first needs to carry out the IMS registration if carry out session, and the main purpose of registration is to obtain corresponding Session Resources, and the position of oneself is registered at network.

Fig. 2 is the flow chart of IMS user's initial registration in the prior art, relates generally to following network element and equipment: UE, P-CSCF, I-CSCF, S-CSCF, HSS.This flow process may further comprise the steps:

S201, UE sends registration request to P-CSCF, this request in the publicly-owned identify label of user;

S202 when P-CSCF receives registration request, disposes the I-CSCF that finds the user attaching Network Access Point by DNS (Domain Name System, domain name system) inquiry or according to this locality, and registration request is forwarded to this I-CSCF;

S203, I-CSCF sends the S-CSCF allocation request message to HSS, and request distributes S-CSCF;

S204, HSS return the ability of S-CSCF name or the S-CSCF of distribution to I-CSCF;

S205, I-CSCF sends to selected S-CSCF with login request message;

S206～216, if S-CSCF need to carry out authentication to the user, then obtain user's Ciphering Key by sending user authentication request from HSS, and the Ciphering Key in the user authentication response message (S207) of returning according to HSS, after structure challenge request (401 Unauthorized message), this challenge ask to be forwarded to UE, UE constructs challenge responses, after S-CSCF receives challenge responses message (S215), judge user's legitimacy, finish authentication, authentication to the user; If do not need authentication, can directly carry out S217;

Contact address, PUI and the PVI identical with initial registration that S217, S-CSCF carry according to UE do not find corresponding user's log-on data in this locality, be initial registration therefore to HSS transmission user data configuring request, and with this request mark;

S-CSCF identifies the current initial registration (namely this asks to be user data configuring request corresponding to initial registration) that is by Server Assignment Type (distribution type) value in the user data configuring request being extended this as REGISTRATION (registration).

S218, HSS judges that local user's state is Not Registered, and registration request is initial registration, think that request is legal, the modification User Status is Registered, and storage S-CSCF information, and user's subscription data, charging address information be included in the user data configuration response return to S-CSCF;

S219, S-CSCF preserves user data and (comprises the network ID that P-CSCF is corresponding, the configuration data that the public subscriber identification of the private user identity of UE and public subscriber identification, UE is corresponding, HSS address, charging address etc.), the structure response message that succeeds in registration, the P-Associated-URI header field value of this response message is carried all publicly-owned identify labels of user but is not comprised the publicly-owned identify label of barred (forbidden);

Simultaneously, S-CSCF registers the login state of this UE and is in this locality: registered (Registered).

S220, the S-CSCF response (200 OK message) of will succeeding in registration is transmitted to I-CSCF;

S221, I-CSCF will succeed in registration to respond and be transmitted to P-CSCF;

S222, P-CSCF are kept at this locality with the information of carrying in the registration message after receiving the response of succeeding in registration, and the response of will succeeding in registration is transmitted to UE.

In flow process shown in Figure 2, in step S218, HSS is Registered according to user's current state, downloads initial trigger rule (the InitialFilter Criteria that comprises in the user contracting data to S-CSCF, IFC), be the IFC for registered users.

Be in the situation of unregistered (Not Registered) the certain user, HSS returns to the initial trigger rule IFC that comprises in the user contracting data of S-CSCF, being the IFC for non-registered users, is obviously different with IFC for registered users.An exemplary of this situation is: AS replaces non-registered users to initiate request, and after S-CSCF received the request of this AS, it was unregistered indicating this user in the SAR request that sends to HSS.

In subsequent process, in order to guarantee connectedness, need to guarantee the registration validity of UE in the IMS network by refresh registration between UE and IMS network, otherwise time is up and UE does not have refresh registration when the registration refresh timer, network will be nullified the registration of this UE.

IMS user's refresh registration flow process and initial registration flow process are basic identical, and main difference is:

S-CSCF carries user's log-on data that the contact address identical with initial registration, PUI and PVI find local storage according to UE, knows the refresh registration that is registered as of UE; Corresponding step S217 and S218 are replaced by S217 ' and S218 ' respectively:

S217 ', S-CSCF sends the user data configuring request to HSS, and is refresh registration with this request mark;

S-CSCF identifies the current refresh registration (namely this asks to be user data configuring request corresponding to refresh registration) that is by Server Assignment Type (distribution type) value in the user data configuring request being extended this as RE_REGISTRATION (re-injection volume).

S218 ', HSS judge that User Status is Registered, and registration request is refresh registration, think legal, storage S-CSCF information, and user's subscription data, charging address information be included in the user data configuration response return to S-CSCF.In the processing that this registration refreshes, HSS can't revise the login state of UE.In this step, HSS downloads to the initialization filtering rule IFC in the user contracting data of S-CSCF for registered users.

Behind the IMS network, before UE initiates refresh registration, the situation that user data is restarted or lost owing to fault to S-CSCF that the home network of UE distributes for this UE may appear at the UE initial registration; Therefore, if UE initiates refresh registration, S-CSCF judges the local UE log-on data before that do not have, in the user data configuring request of HSS initiation, inform that HSS is initial registration, this moment is inconsistent with the login state of HSS storage, HSS returns failure response to S-CSCF, thereby causes the failure of UE refresh registration.

Fig. 3 has described the flow process of IMS user's refresh registration failure in the prior art, relates generally to following network element and equipment: UE, S-CSCF, HSS, may further comprise the steps:

S301, UE sends the refresh registration request to network, in this request with the publicly-owned identify label of user; The refresh registration request arrives S-CSCF through P-CSCF, I-CSCF;

S302～S306, if S-CSCF need to carry out authentication to the user, then obtain user's Ciphering Key by sending user authentication request from HSS, and the Ciphering Key that comprises in the user authentication response message (S303) of returning according to HSS, structure challenge request (401 Unauthorized message), after this challenge request is forwarded to UE, UE constructs challenge responses, after S-CSCF receives challenge responses message (S305), judge user's legitimacy, finish authentication, authentication to the user; If do not need authentication, can directly carry out S307;

S307, contact address, PUI and the PVI identical with initial registration that S-CSCF carries according to UE carry out this locality and search, the local user's log-on data that has correspondence of discovery is initial registration therefore to HSS transmission user data configuring request, and with this request mark;

S308, HSS judge that User Status is Registered, but registration request is initial registration, think that request is illegal;

S309, HSS return failure cause to S-CSCF and are the user data configuration failure response of " state is inconsistent ";

S310, S-CSCF structure registration failure response (500 message);

S311, S-CSCF is transmitted to UE through P-CSCF with registration failure response (500 message).

In addition, the problem that can occur equally UE refresh registration failure shown in Figure 3 in following situation: if the S-CSCF that serves for UE breaks down, when UE initiation registration refreshes, be the new S-CSCF of UE service by the I-CSCF gravity treatment, processed the refresh registration request of UE by new S-CSCF.

According to above description as can be known, exist in the prior art because the registration that the S-CSCF failure and other reasons causes S-CSCF to receive UE is judged to be initial registration with it after refreshing mistakenly, thereby causing HSS refusal to accept that this is mistaken as is the problem that the registration of initial registration refreshes, and this problem finally causes the refresh registration of UE can't be successful.

Summary of the invention

Technical problem to be solved by this invention is, overcomes the deficiencies in the prior art, and the user registering method in a kind of IMS network is provided, and user that cause can't successfully carry out the problem of refresh registration so that the user registration state that solves S-CSCF and HSS is inconsistent.

In order to address the above problem, the invention provides a kind of user registering method of IP Multimedia System network, after service call conversation control function S-CSCF receives user's registration request, if judging that this user is current is unregistered state, then send the user data configuring request of carrying the initial registration sign to home subscriber server HSS;

After receiving failure cause that HSS returns and being the inconsistent user data configuration failure response of state, S-CSCF sends the user data configuring request of carrying the refresh registration sign to HSS;

After receiving the user data configuration successful response that HSS returns, S-CSCF finishes follow-up user and registers operation.

In addition, after receiving described user data configuring request of carrying initial registration sign, if HSS knows that according to the information of local record this user's login state is registered, then in described user data configuration failure response, add this user's login state identification information.

In addition, after S-CSCF receives described user data configuration failure response, according to the login state of described login state identification information the described user of local record.

In addition, described login state identification information is the newly-increased field or the parameter that are used for the identifying user login state in the described user data configuration failure response.

In addition, described login state identification information is newly-increased failure reason value in the described user data configuration failure response; This failure reason value be used for the former of expression user data configuring request failure because: user registration state is registered.

In addition, S-CSCF judges the login state that this user is current according to the user's log-on data whether this locality stores described user.

In addition, after S-CSCF receives the response of described user data configuration successful, user's login state is recorded as registered, and sends the response of succeeding in registration to described user.

In addition, the initial registration in the described user data configuring request is designated: be worth the distribution type parameter for REGISTRATION;

Refresh registration in the described user data configuring request is designated: be worth the distribution type parameter for RE_REGISTRATION.

In sum, method of the present invention is applied to IP Multimedia System, so that since S-CSCF restart or for some reason the barrier cause in the situation of losing user data or gravity treatment S-CSCF no user data, when the user initiated refresh registration, the user registration state of S-CSCF and HSS was inconsistent and problem that user that cause can't successfully carry out refresh registration is resolved.

In addition, after HSS receives the user data configuring request and finds that user registration state is inconsistent, can add the user registration state identification information that records among the HSS in the response of user data configuration failure, be that the user is current registered so that S-CSCF is known the reason that causes the failure of user data configuring request clearly.

Description of drawings

Fig. 1 is IMS architectural framework schematic diagram of the prior art;

Fig. 2 is the flow chart of IMS user's initial registration in the prior art;

Fig. 3 is the flow process of IMS user's refresh registration failure in the prior art;

Fig. 4 is the user registering method flow chart of embodiment of the invention IMS network.

Embodiment

Basic thought of the present invention is, send the user data configuring request that is designated initial registration as S-CSCF, and receive failure cause that HSS sends for the response of " state is inconsistent " user data configuration failure after, again initiate to be designated the user data configuring request of refresh registration to HSS.

Describe the present invention below in conjunction with drawings and Examples.

Fig. 4 is the user registering method flow chart of embodiment of the invention IMS network; In the present embodiment, S-CSCF specifically comprises the steps: by initiating twice user data configuring request to HSS successfully to realize user's refresh registration

S401～S407 is identical with step S301～S307 respectively.

S408～S409, after HSS receives the user data configuring request of S-CSCF transmission, identify the initial registration sign (being that Server Assignment Type is REGISTRATION) in this request, the login state that identifies in other words the user is unregistered (Not Registered), but this user's of local record login state is Registered, judge that this request is illegal, therefore return failure cause to S-CSCF and be the user data configuration failure response of " state is inconsistent ", and in this failure response, carry the identification information of this user registration state of local record;

The method of carrying user registration state in the response of user data configuration failure can be: increase a user registration state field or parameter in this response message, or the failure cause parameter of this response message expanded, increasing that a failure reason value (namely increasing a parameter value) is used for identifying current failure cause is " user registration state is registered (Registered) ".

After S410, S-CSCF receive the user data configuration response that HSS returns, know that UE is current to register, therefore again initiate the user data configuring request, and be refresh registration with this request mark;

In addition, in this step, S-CSCF can preserve the registered state of the UE that HSS returns, in order to again receive the login state that can correctly judge this user behind this user's the registration request.

S411, after HSS receives the New Consumers data configuration request of S-CSCF transmission, identify the refresh registration sign (login state that is the user is registered (Registered)) in this request, consistent with this user's of local record login state, therefore signatory (business configuration) data, the charging address information with the user is included in the user data configuration successful response message and returns to S-CSCF;

And in this step, HSS downloads the business configuration data to this user of S-CSCF, and initial filter criteria wherein (IFC) is for registered users.

S412, after S-CSCF receives the user data configuration successful response that HSS returns, user's login state is recorded as registered (Registered), preserves user's subscription data, charging address, and construct the response (200 OK message) of succeeding in registration;

S413, S-CSCF will succeed in registration to respond via P-CSCF and send to UE.

In sum, compared with prior art, technical scheme of the present invention has remedied the deficiency of existing protocol, when S-CSCF is restarted, fault recovery, or after gravity treatment is the S-CSCF of UE service, when the user initiates refresh registration, when the mutual Discovery Status of S-CSCF and HSS is inconsistent, by again keeping alternately state consistency with HSS with HSS, be successfully completed the refresh registration request.

Claims (6)

1. the user registering method of an IP Multimedia System network is characterized in that,

After service call conversation control function S-CSCF receives user's registration request, if judging that this user is current is unregistered state, then send the user data configuring request of carrying the initial registration sign to home subscriber server HSS;

After receiving described user data configuring request of carrying initial registration sign, if HSS knows that according to the information of local record this user's login state is registered, then in the response of user data configuration failure, add this user's login state identification information; Described login state identification information is the newly-increased field or the parameter that are used for the identifying user login state in the described user data configuration failure response;

After receiving failure cause that HSS returns and being the inconsistent user data configuration failure response of state, S-CSCF sends the user data configuring request of carrying the refresh registration sign to HSS;

After receiving the user data configuration successful response that HSS returns, S-CSCF finishes follow-up user and registers operation.

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

After S-CSCF receives described user data configuration failure response, according to the login state of described login state identification information the described user of local record.

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

Described login state identification information is newly-increased failure reason value in the described user data configuration failure response; This failure reason value be used for the former of expression user data configuring request failure because: user registration state is registered.

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

S-CSCF judges the login state that this user is current according to the user's log-on data whether this locality stores described user.

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

After S-CSCF receives the response of described user data configuration successful, user's login state is recorded as registered, and sends the response of succeeding in registration to described user.

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

Initial registration in the described user data configuring request is designated: be worth the distribution type parameter for REGISTRATION;

Refresh registration in the described user data configuring request is designated: be worth the distribution type parameter for RE_REGISTRATION.

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