CN100583837C

CN100583837C - Method for implementing service based on IMS

Info

Publication number: CN100583837C
Application number: CN200510115464A
Authority: CN
Inventors: 武亚娟
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2005-11-03
Filing date: 2005-11-03
Publication date: 2010-01-20
Anticipated expiration: 2025-11-03
Also published as: CN1960343A

Abstract

The method comprises: the application server replaces the session request initiating side to transmit the session request message to I-CS, the I-CSCF gets the S-CSCF information corresponding to the replaced side; according to said S-CSCF information, I-CSCF transmits the session request message to its corresponding S-CSCF; according to the received session request message, S-CSCF implement the service. By the invention, the application server can determines how to initiate a session request according to the actual circumstances.

Description

A kind of service implementation method based on IMS

Technical field

The present invention relates to the network communications technology field, be specifically related to a kind of service implementation method based on IMS.

Background technology

Development along with broadband network, mobile communication will not only be confined to traditional Speech Communication, multimedia service in conjunction with multiple medium types such as audio frequency, video, picture and texts will be carried out gradually, by with presence (presenting business), management and group, the combination of data services such as short message, WEB (webpage) browse, locating information, PUSH (pushing professional), file-sharing can be satisfied user's multiple demand.

Under the promotion of multiple application, 3GPP (3rd Generation Partnership Project, the standardized partnership projects of 3G (Third Generation) Moblie) and 3GPP2 (3rd Generation Partnership Project 2, the standardized partnership projects 2 of 3G (Third Generation) Moblie) etc. normal structure has all successively been released IP-based IP multimedia subsystem, IMS framework, purpose is to use a kind of structure of standardized opening to realize diversified multimedia application in the mobile network, and the user is more to be selected and abundanter impression to offer.

In 3GPP Release 5 (R5) stage, introduced IMS domain, be called for short IMS, IMS is superimposed upon on the packet field network, be made up of CSCF (CSCF), MGCF (MGCF), MRF (media resource function) and HSS functional entitys such as (home signature user servers), wherein: CSCF can be divided into S-CSCF (serving CSCF), P-CSCF (proxy CSCF) and three logic entities of I-CSCF (inquiry CSCF) again.S-CSCF is the service switching center of IMS, carries out session control, and peace preservation association's speech phase is in charge of user profile, produces charge information etc.; P-CSCF is the access point of terminal user access to IMS, finishes user's registration, is responsible for QoS control and safety management etc., and I-CSCF is responsible for the intercommunication between the IMS territory, and network topology and configuration are externally hidden in the distribution of management S-CSCF, produce metering data etc.The MGCF control gateway realizes the intercommunication of IMS network and other network, and MRF provides media resource, as the folding and unfolding sound, and encoding and decoding and multimedia conferencing bridge etc.HSS is a customer data base, storage IMS user's subscription data and configuration information etc.

Because the structure of IMS network has accomplished that carrying network with bottom has nothing to do, therefore, the IMS network of 3GPP definition also can be applied on other packet networks outside the packet field network of 3GPP definition, such as the packet network that defines among the 3GPP2, wlan network and NGN network etc., realized with the user use terminal type independence and and the independence of access network type, therefore, here do not limit IMS and only be applied in relevant network of 3GPP and the application, the access network of other types also can be realized with the IMS framework with using with the business of carrying network.

SIP (Session Initiation Protocol, Session initiation Protocol) is the IP phone signaling protocol that is proposed by IETF (Interne engineering duty group).Implication as its name surface, SIP is used for initiation session, it can control the foundation and the termination process of the Multimedia session of one or more participant's participation, and can dynamically adjust and revise session attribute, as session bandwidth require, the medium type of transmission such as voice, video, text etc., medium code/decode format, to the support of multicast and clean culture etc.In IMS, use the signaling control protocol of Session Initiation Protocol as IP multimedia session.

AAA, authentication authorization and accounting (Authentication), mandate (Authorization) and charge (Accounting), AAA is the basis that Virtual network operator carries out network operation and management always, along with the development of AAA, and new frame structure Diameter technology moulding.Diameter family comprises: basic agreement (DiameterBase Protocol) and various application protocol, wherein, basic agreement provides the Minimum requirements as an aaa protocol, be the function that the Diameter network node all must be realized, comprise the real-time Transmission of the reception of negotiation, Diameter message of ability between node and forwarding, charge information etc.Application protocol then makes full use of the message transfer mechanism that basic agreement provides, the function of standard interdependent node with and distinctive message content, realize the AAA of applied business.In IMS, just be to use Diameter to transmit relevant information on the Cx interface between HSS and I-CSCF and HSS and the S-CSCF.

HSS is the most important database of each user, in store all with the signatory relevant information of user, be used to support the processing of each network entity to calling and session, the information of its preservation comprises: user ID, numbering and addressing information, user security information, customer position information and user description information (user profilcinformation) etc.A home network can have one or more HSS, and the quantity of HSS depends on the capacity of mobile contracted user's quantity, the network equipment and concrete networking situation.Between a plurality of entities in HSS and the network interface is arranged.

The user of each IMS business of having contracted has distributed one or more private user identity IMPI by home network operator, be used for using at registration, mandate, management and charging process, IMPI uses NAI (Network Access Identifier, network access Identifier) form, each IMS user also has one or more public user identity IMPU (IP Multimedia PUblic identity, IP multimedia public user identity), sign oneself found the other side when IMPU was used for other telex networks.Private user identity is generally externally not open, and public user identity is externally disclosed, uses in the conversation procedure that uses all kinds of business.

In addition, along with professional abilities such as PRESENCE (presenting business), MESSAGING (messaging service), CONFERENCING (convention business), group service by modularization and standardization, and in the IMS network, use, a kind of new PSI (Public Service Identitity, public service identity) is introduced into.

The difference of public service identity and public user identity is: public user identity is that the user is used for identifying oneself in the use of all kinds of business, find the other side's sign, and public service identity is the sign to business, these business generally all reside on the application server AS, such as local service (Local Service) etc., in addition, public service identity can also be used to identifying a group, such as in the business of chatroom, public service identity such as sip:chatlist_X@example.com can be used for representing a chat group, each user can set up session with this PSI, carries out the transmitting-receiving of message by the AS at this PSI place and other participants in the chat sessions.

The form of PSI can be SIP URI or TEL URI.

According to the difference of Business Nature, the configuration of PSI and route can have multiple realization mechanism according to the hobby of operator.Should guarantee all that in various realization mechanisms PSI is created uniqueness afterwards, and the route of PSI should be followed the basic principle of IMS route.

When the resident AS of PSI uses as initiator's application server, the configuration of PSI and route are to realize by the filtering rule in the user signing contract information, that is: calling party's S-CSCF mates according to the filtering rule of downloading from HSS, determines and the sip message of correspondence need be sent to certain specific AS.This AS can think prior static configuration, and this AS can only inner access in the IMS network of the operator that disposes this PSI.

When the AS of resident PSI initiates the SIP conversation request as the initiator, if having used network configuration hides, so, final jump must be an I-CSCF who realizes THIG (TopologyHiding Inter-nctwork Gateway, topology hiding Interworking gateway) function in the IMS of initiation session network; And, when the purpose sign is the URI of a TEL form, need carry out the ENUM conversion, come route SIP conversation request message according to transformation result.The PSI route mainly contains dual mode: mode one, AS directly are forwarded to the purpose network with the sip request message of initiating, do not need the participation of S-CSCF, when if the purpose sign is the URI of TEL form, AS wants to support the ENUM inquiry, if AS does not support the ENUM inquiry, just must carry out the PSI route according to the second way, be under the situation of URI of TEL form in purpose sign at least perhaps, carries out the PSI route according to the second way.Mode two, distribute a S-CSCF to PSI, AS gives S-CSCF with the forwards of initiating like this, and follow-up flow process is handled according to the flow process that S-CSCF handles general initiator's calling.

The application server that resident AS of PSI also can be used as termination side uses.This PSI can global route, and this AS inner and carrier network outside all is available at carrier network.This PSI can have two kinds of forms, and a kind of form is special-purpose PSI, and another kind of form is general PSI.Special-purpose PSI can be generated in HSS, revise and delete by Operation and Maintenance mechanism by operator; The generation of the generation of general PSI, modification and deletion and special-purpose PSI, modification and deletion are similar, and difference is that the domain name part of general PSI is identical with the domain name part of special-purpose PSI, and still, User Part is to use an asterisk wildcard to indicate.

When using as the application server of termination side for the resident AS of PSI, the route of PSI mainly contains following dual mode: mode 1, safeguard that in HSS one is the S-CSCF and the corresponding filtering rule of the AS distribution of resident PSI, like this, when callee side as network between the I-CSCF at critical point when receiving a sip request message, can inquire about the routing iinformation of this PSI to HSS, HSS returns an address for the S-CSCF of this PSI distribution to I-CSCF, S-CSCF matches the address of this AS according to filtering rule, then, sip request message is forwarded to this AS.Certainly, also can dispose the tabulation of the domain name of all supports at the I-CSCF place, when I-CSCF receives sip request message, check tabulation, if find that the match is successful, just issue corresponding DNS inquiry route, then, the IP address that I-CSCF returns according to DNS directly sends to sip request message the AS of corresponding IP address.Mode 2, safeguard the address information of the AS of a resident PSI in HSS, like this, as I-CSCF to HSS inquiring position information the time, HSS can be directly returns to I-CSCF with the address information of the AS of this PSI, and I-CSCF directly is forwarded to session this AS.

Process to the AS initiation session is described in detail below.

AS can replace a user or a professional initiation session of using public service identity to represent of using public user identity to represent in the IMS network, when AS replaced user's initiation session to set up, what fill out in expression initiator's the territory in the sip request message was exactly user's sign itself.

On behalf of IMPU or PSI, AS when initiate a session request, at first need to obtain the address of S-CSCF, if AS replaces the user to use IMPU to initiate a session request, and AS can't obtain an address for the S-CSCF of this IMPU service, then AS can not representative of consumer initiate this conversation request.If AS uses PSI to initiate a session request, and this PSI is not assigned with a S-CSCF address, then AS uses mechanism such as DNS to finish the routing procedure of sip message, directly the session request message is sent to called network.If AS has obtained the address for the S-CSCF of IMPU or PSI service, then AS sends conversation request message to this S-CSCF.

The process of AS initiation session as shown in Figure 1 in the IMS network.

Among Fig. 1, obtain the S-CSCF address at step 1, AS.If AS has obtained the address for the S-CSCF of IMPU or PSI service, to step 2a.If AS can't obtain the address into the S-CSCF of IMPU service, to step 2b.

Send the SIP INVITE to S-CSCF at step 2a, AS, the conversation media descriptor (initial SDP offer) that provides at first is provided in the SIP INVITE.To step 3.

Send the network of SIP INVITE at step 2b, AS, by the follow-up conversation procedure of network continuation at called subscriber place to the called subscriber place.The conversation media descriptor (initial SDP offer) that provides at first is provided in the SIP INVITE.

Determine that at step 3, S-CSCF the SIP INVITE of its reception is a request from Calling Side, trigger the relevant service logic of calling service, in this step, S-CSCF is considered as a request message that has passed through authentication and licensing process with this request message.

To step 4, this step is two reciprocal processes between the S-CSCF in the network.

Return signaling message at step 5-6, callee side network to AS, carry the media session descriptor of callee side in the signaling message.

Determine the Media Stream ability that this session need provide at step 7-8, AS, after AS confirms its media description information of receiving the other side,, also can comprise the media description information of Calling Side in this acknowledge message to the affirmation message of callee side echo reply.

In step 9-10, the callee side affirmation message to the Calling Side echo reply, if carried media description information in the affirmation message of replying that callee side receives, then callee side also needs to carry media description information in the affirmation message of replying that Calling Side returns.

After step 11-12, resource reservation success, callee side returns acknowledge message to Calling Side.

Optionally can carry out the processing of alerting ring step 13-14, called subscriber.

Step 15-16, called subscriber answer after, return the AS that a final response 200OK gives Calling Side.

Returning ACK after step 17-18, AS receive 200OK confirms.

From the foregoing description process as can be known, when the AS of resident PSI replaces one to use user's initiation session that public user identity represents as the initiator, if AS can't obtain the address into the S-CSCF of this IMPU service, then AS not representative of consumer initiate this conversation request, the treatment principle of route as initiator's initiation session time the according to AS, the AS that is necessary for resident PSI distributes a S-CSCF, because AS itself does not possess the ability of selecting S-CSCF, therefore, AS has only the S-CSCF name of using the IMPU inquiry to serve for this user to HSS by the SH interface, perhaps uses at the S-CSCF of configuration of AS place.Similarly, when AS replaces one to use the professional initiation session that public service identity represents as the initiator, if can be routed directly to the purpose network then not need S-CSCF, otherwise, also need mode by SH interface or configuration to obtain a S-CSCF who distributes for this PSI and carry out follow-up route and handle.

According to above-mentioned processing, if AS is the S-CSCF that assigned I MPU or PSI distribute by the SH interface to the HSS inquiry, HSS is according to the result who searches, the user of the IMPU correspondence of current this appointment of discovery is because not registration, do not serve and be assigned with a S-CSCF, cause HSS can't return an effective S-CSCF and give AS, like this, AS can not replace this IMPU to initiate a session request.

But, demand from reality, a user has triggered this AS by certain mode and has replaced oneself initiating a session request, with this user whether in the IMS network registration do not have direct relation, can just not allow AS to replace this user to initiate a session request because of the current not registration of this user.For example: on an application server, the contracted business of a timed sending mail of certain user, so that in friends birthday, can send an e-greeting card to this friend by this application server, so, implementation procedure according to present AS initiation session, when if application server is set up process in the signatory required session of time initiation propelling movement e-greeting card, signatory this professional user did not register on the IMS network at that time, so, this application server can be because can't obtain a current S-CSCF for this user's service, and can't initiate this conversation request, naturally this user business of contracting also just can't realize, no matter such result is to the contracted user, still all be very bad to service provider's impression, the contracted user can't guarantee that oneself must be registered to the IMS network in the signatory moment, does not just cause business to realize and the service provider does not also wish because the user registers.

Concerning PSI, also there is similar problem, it between the application server certain business that can subscribe to the other side mutually, but the execution of these business and enforcement should be with this signatory current prerequisites that whether is available as of application server, in some cases, an application server replaces a PSI to initiate a session request, this session is likely and an irrelevant conversation procedure of the application server of resident this PSI, therefore can not remove to pay close attention to the application server of resident this PSI.

In sum, application server replaces the implementation method that an IMPU or PSI initiate a session request at present, can not successfully set up session under some application scenarios, makes business realizing limited, poor user experience.

Summary of the invention

The objective of the invention is to, a kind of service implementation method based on IMS is provided, session can be under various application scenarioss be successfully realized, realized improving the business realizing mode flexibility, improve the purpose of user's business experience.

For achieving the above object, a kind of service implementation method based on IMS provided by the invention comprises:

The application server of a, the replacement side of initiating a session request to I-CSCF, in the expression initiator's of described conversation request message the territory carries the session request message transmission by the identification information of replacement side;

B, I-CSCF obtain the corresponding S-CSCF information by replacement side according to described identification information;

C, I-CSCF according to described S-CSCF information with the session request message transmission to corresponding S-CSCF;

D, S-CSCF realize professional according to the conversation request message of its reception.

Application server among the described step a is: the initiator that the professional initiation session of public service identity is used in the initiator of user's initiation session of replacement use public user identity or replacement.

Described step a is specially:

The initiator's application server that replaces initiating a session request when determining to obtain by the identification information of the S-CSCF of the side of replacement correspondence, with the session request message transmission to I-CSCF; Or

The initiator's application server that replaces initiating a session request when initiating a session request, directly with the session request message transmission to I-CSCF.

Described step b comprises:

B1, I-CSCF obtain the corresponding S-CSCF information by replacement side from HSS.

When described by replacement side when using the user of public user identity, the S-CSCF information by the side's of replacementing correspondence of storing among the described HSS be by user's explicit registration process and/or Operation and Maintenance and/or HSS and and its have between the network entity of annexation and be provided with alternately;

When described by replacement side when using public service identity professional, store among the described HSS by the S-CSCF information of replacement side be by Operation and Maintenance setting and/or HSS and and its have between the network entity of annexation and be provided with alternately.

The described square mark information that replaced of storing among the HSS is provided with unregistered state identification information or calling party's unregistered state identification information.

Described step b1 comprises:

I-CSCF is described by the identification information of the corresponding S-CSCF in replacement side to the HSS inquiry;

HSS will be by the S-CSCF capability set message transmission of the identification information of the corresponding S-CSCF in replacement side or quilt replacement side correspondence to I-CSCF according to described inquiry.

Described step c comprises:

I-CSCF when receiving the identification information of the S-CSCF that HSS transmission comes, according to the identification information of this S-CSCF with the session request message transmission to corresponding S-CSCF; Or

I-CSCF chooses a S-CSCF according to S-CSCF capability set information when receiving the S-CSCF capability set information that HSS transmission comes, and with the session request message transmission to the described S-CSCF that chooses.

Described method comprises that also steps d comprises:

S-CSCF is according to the follow-up operation flow of himself storage user data continuation; Or

To the HSS request quilt user data of replacement side, S-CSCF receives, preserves the user data that HSS returns S-CSCF, and continues follow-up operation flow according to its conversation request message that receives.

Described method also comprises:

HSS stores described by the identification information of the corresponding S-CSCF in replacement side when receiving the user data requests of S-CSCF.

Described method also comprises:

HSS with the identification information of the S-CSCF of its storage and/or S-CSCF capability set message transmission to other network entities.

Described method also comprises:

S-CSCF is after session service finishes, and notice HSS deletes the identification information of the S-CSCF of corresponding stored among the HSS.

Description by technique scheme as can be known, the initiator that application server of the present invention instead initiates a session request is by being forwarded to I-CSCF with the session request message, continue to finish follow-up conversation procedure by I-CSCF, for session provides a kind of new realization mechanism, make application server in the business realizing process, can determine how to initiate a session request according to the concrete condition of business, simultaneously, efficiently solve application server under the situation of the identification information that can not obtain S-CSCF, the professional problem that can not realize, make application server under any circumstance, can both replace user or other application servers to initiate a session request, realize professional, as when the user with IMPU sign does not register, application server can replace the user with IMPU sign to realize business, no matter the state of the application server of resident PSI how for another example, application server as the initiator can both replace the application server of resident PSI to initiate a session request, and avoids in the business realizing process quilt many restrictive conditions of replacement side; HSS of the present invention is by the identification information at S-CSCF storage S-CSCF when it asks user data, make HSS can at this session by other session implementation procedure of replacement side in, the S-CSCF identification information is transferred to application server or the corresponding I-CSCF that replacement initiates a session request, made things convenient for professional realization; By in the identification information of replacement side unregistered state or calling party's unregistered state are set by what preserve, make HSS issue the identification information of S-CSCF accurately, guaranteed that session service can successfully realize according to the actual conditions of business at HSS; Thereby by technical scheme provided by the invention realized improving the business realizing mode flexibility, improve the purpose of user's business experience.

Description of drawings

Fig. 1 is the flow chart of AS initiation session in the prior art;

Fig. 2 is the flow chart of AS initiation session of the present invention.

Embodiment

Core of the present invention is: instead the application server of the side of initiating a session request with the session request message transmission to I-CSCF, I-CSCF obtains the corresponding S-CSCF information by replacement side, with the extremely corresponding S-CSCF of session request message transmission, S-CSCF realizes professional according to the conversation request message of its reception I-CSCF according to described S-CSCF information.

Based on core concept of the present invention technical scheme provided by the invention is further described below.

Application server of the present invention is the initiator of conversation request, and be the initiator that replacement initiates a session request, application server can replace the user with IMPU sign to initiate a session request, application server also can replace using the business of PSI to initiate a session request, promptly replaced thinking user with IMPU sign, also can be for using the business of PSI.

Be convenient follow-up description, will have the IMPU sign the user, uses the business etc. of PSI to be called to be service-user by the side's of replacementing unification.Be the initiator application server of application server of the present invention for replacing service-user to initiate a session request.

Conversation request message among the present invention can be the SIP conversation request message.The present invention does not limit the concrete type of service that realizes by conversation request message, promptly need among the present invention the business that realizes on the SIP aspect by session or be independent of that the mode of session connects professional and using.

Application server of the present invention can trigger it by triggering modes such as internal trigger, external trigger and replace service-user to initiate a session request, be that application server is when the condition of the initiation SIP conversation request that is provided with of portion satisfies within it, replace service-user to initiate the SIP conversation request as the initiator, perhaps application server replaces service-user to initiate the SIP conversation request as the initiator when receiving the message of outside initiation SIP conversation request.

Because application server replaces service-user to initiate a session request, therefore, what carry in the expression initiator's of SIP conversation request message the territory is the identification information of service-user itself.

Application server is when replacing service-user to initiate the SIP conversation request, can at first remove to obtain the identification information of the S-CSCF of service-user correspondence, inquire about the identification information of S-CSCF to HSS by the SH interface as application server, the reasons such as configuration information that do not have registration or in HSS, do not preserve the professional corresponding S-CSCF that uses PSI owing to the user with IMPU sign is current, make the service-user of application server given query not have current available S-CSCF, thereby make HSS can not in response message, return the identification information of S-CSCF.At this moment, application server can not get access to the identification information of the S-CSCF of service-user correspondence, application server should transfer to the SIP conversation request message I-CSCF that is responsible for inquiry S-CSCF information, come the identification information of the S-CSCF of inquiry business user correspondence by I-CSCF, and continue to realize follow-up session service; Application server also can be when replacing service-user to initiate the SIP conversation request, do not obtain the process of identification information of the S-CSCF of service-user correspondence, but directly the SIP conversation request message is transferred to I-CSCF, come the identification information of the S-CSCF of inquiry business user correspondence by I-CSCF, and continue to realize follow-up conversation procedure.

I-CSCF is when receiving the SIP conversation request message of application server transmission, the identification information of the service-user that carries in the territory according to the initiator of SIP conversation request message itself sends routing inquiry message to HSS, with the routing iinformation of the service-user of appointment in the inquiry SIP conversation request message.At this moment, the identification information of the service-user that carries in the routing inquiry message can be IMPU, also can be PSI.

HSS receives the routing inquiry message that the I-CSCF transmission comes, and identifies the service-user of inquiring about this appointment according to the service-user of the needs inquiry routing iinformation that carries in the routing inquiry message and whether be assigned with a S-CSCF; If HSS determines service-user and has been assigned with S-CSCF that then HSS returns the identification information of the S-CSCF of its preservation, the i.e. name of S-CSCF to I-CSCF in the routing inquiry response message; If HSS determines service-user and is not assigned with S-CSCF that then HSS returns the S-CSCF capability set information that satisfies service-user service contracting requirement to I-CSCF according to the signed instrument of service-user in the routing inquiry response message.

When service-user is when using the user of IMPU sign, owing to use the user of IMPU sign that the process of an explicit registration of user is arranged, so, the identification information of the S-CSCF that stores among the HSS can be to obtain and store in the process of the explicit registration of user, certainly, the identification information of the S-CSCF that stores among the HSS also can dispose by modes such as Operation and Maintenance mode such as static configuration, can also be to obtain and store by the reciprocal process between HSS and other network entities, other network entities here can be S-CSCF, I-CSCF or application server etc.

When service-user when using PSI professional, the application server of resident PSI does not have the explicit registration process of user, so the identification information of the S-CSCF that stores among the HSS can be by configurations such as Operation and Maintenance mode such as static configuration.Certainly, the identification information of the S-CSCF that stores among the HSS also can be to obtain and store by the reciprocal process between HSS and other network entities, and other network entities here can be S-CSCF, I-CSCF or application server etc.

I-CSCF receives the routing inquiry response message that HSS returns, when I-CSCF from the routing inquiry response message, get access to be the identification information of S-CSCF the time, directly the identification information according to this S-CSCF transfers to corresponding S-CSCF with the SIP conversation request message.When I-CSCF from the routing inquiry response message, get access to be S-CSCF capability set information the time, I-CSCF is according to S-CSCF capability set information, and in conjunction with the ability configuring condition of each S-CSCF at I-CSCF place, select a S-CSCF, the SIP conversation request message that I-CSCF sends application server is forwarded to the S-CSCF place of its selection.

S-CSCF receives the SIP conversation request message that the I-CSCF transmission comes, and realizes follow-up conversation procedure according to the SIP conversation request message.

S-CSCF if find oneself do not have to preserve, also do not receive the relevant user data of service-user that carries with this SIP conversation request message, then needs to obtain the user data of this service-user, and preserves when receiving the SIP conversation request message.S-CSCF can obtain the user data of service-user by the mode of asking this specified services user data of users to HSS.

HSS is in the user data query according to the service-user of S-CSCF, when S-CSCF returns the user data of service-user, also the identification information of S-CSCF such as the name of S-CSCF can be kept among the HSS, use during for the subscriber-related route information query of follow-up and this specified services.

From foregoing description as can be seen, business in the service implementation method of the present invention has certain particularity, promptly when service-user be when having the user of IMPU sign, because having the user of IMPU sign is the user who does not have registration, at this moment, business can be considered to be the business that a kind of actual user does not have registration, and it doesn't matter for the current login state of the realization of business of the present invention and user; When service-user was the PSI business, the PSI business did not have registration process, and the practical application server state of professional implementation procedure and resident PSI is irrelevant, and at this moment, business can be considered to be the irrelevant business of practical application server state of a kind of and resident PSI.In a word, business of the present invention can be called as and the irrelevant business of initiator's state.

When service-user is that business of the present invention can be called the unregistered business of initiator, can be classified as unregistered service one class when having the user of IMPU sign.The main difference part of unregistered business of initiator of the present invention and present existing unregistered service is, present existing unregistered service only at the user as called situation, and unregistered business of the present invention is at the situation of user as caller.

S-CSCF downloads the user data of unregistered business from HSS for convenience, the present invention can increase service contracting data and the user description information relevant with unregistered service in HSS, like this, S-CSCF is to HSS request download user data the time, can come according to user's unregistered state to HSS request download user data, HSS also can download user's corresponding user data of unregistered state to S-CSCF accurately and use.

For unregistered session service of the present invention is distinguished with the present already present unregistered session service relevant with the called subscriber, HSS of the present invention can distinguish preservation to user data according to session initiator, session termination side's information.The SIP conversation request message that S-CSCF can distinguish its reception is initiator's SIP conversation request message, or the SIP conversation request message of termination side, S-CSCF can be when HSS sends user data requests, indicate the unregistered user data of its request calling subscriber, thereby guaranteed the download user data that S-CSCF can be correct.

S-CSCF can be after application server replaces the conversation end of service-user initiation, notice HSS removes the identification information of S-CSCF of the unregistered user's correspondence of calling subscriber of its preservation, like this, in other business realizing process, HSS just can be with the treatment region of the routing iinformation of the application server that initiates a session request at the processing of the routing iinformation of above-mentioned service-user with at this replacement separately, because for the SIP conversation request message that application server replaces service-user to initiate, S-CSCF is by the orig field in the sip request message, content among record route header field and the p-asserted-identity can replace application server the SIP conversation request message of initiation and other SIP conversation request message to distinguish.If there is conversation request message to arrive during this at concrete service-user, S-CSCF can know current this concrete service-user that oneself can't arrive, therefore, can realize business at service-user as the processing procedure of called subscriber's sip request message according at present existing, when being the signatory called unregistered service of service-user, return the response message of session service failure to the session initiator, when service-user had been contracted called unregistered service, S-CSCF was forwarded to a specific application server with the SIP conversation request message and goes to handle.Thereby guaranteed that application server can replace service-user to initiate a session request, realized business, simultaneously, avoided as much as possible again using for interim this S-CSCF that distributes of this service-user is used as the route that is routed to concrete service-user by other users.

Certainly, S-CSCF also can be after application server replace the conversation end of service-user initiation, notice HSS removes the identification information of the S-CSCF that preserves among the HSS, like this, the identification information of S-CSCF can continue to be retained among the HSS, be retained in service-user identification information such as IMPU among the HSS, PSI etc. are set to unregistered state or further are set to calling party's unregistered state, like this, there are other to replace this specified services user message that initiates a session request when follow-up by application server, need be when HSS inquires about routing iinformation, HSS will be according to by the state of replacement side the identification information of the S-CSCF of this preservation being returned to the application server ISSUER, make application server realize follow-up business by S-CSCF with replacing this specified services Client-initiated conversation request message directly to transfer to corresponding S-CSCF.

Behind the identification information that remains with S-CSCF among the HSS, if HSS receives the routing inquiry message of this service-user that I-CSCF sends once more, when HSS finds to need I-CSCF to reselect a S-CSCF, can be simultaneously with the identification information of the S-CSCF of its preservation with select the new required capability set information of S-CSCF to return to I-CSCF together by the routing inquiry response message, make I-CSCF select a S-CSCF according to the identification information of S-CSCF capability set information, S-CSCF.

After in HSS, remaining with the identification information of S-CSCF, when the user initiatively initiates registration process as the user who uses the IMPU sign, HSS can return to I-CSCF with the identification information of its S-CSCF that preserves in above-mentioned business realizing process, also the S-CSCF ability information can be returned to I-CSCF, reselect a S-CSCF for I-CSCF, can also be simultaneously the S-CSCF identification information and the S-CSCF ability information of its preservation be returned to I-CSCF, be to use original S-CSCF for the I-CSCF judgement, still reselect a S-CSCF.

After in HSS, remaining with the identification information of S-CSCF, after the configuration information of the application server of application server such as resident PSI is modified, also there is similar processing procedure, be that HSS can return to the identification information of its S-CSCF that preserves this application server use in above-mentioned business realizing process, also can return the S-CSCF ability information and reselect a S-CSCF for I-CSCF, can also return identification information and the S-CSCF ability information of the S-CSCF of preservation simultaneously, be to use original S-CSCF for the I-CSCF judgement, still reselect a S-CSCF.

When other user initiates the SIP conversation request message, need and above-mentioned service-user when communicating, because this moment, service-user not necessarily can reach, may not register at that time as the user who uses the IMPU sign, therefore, this unregistered user can't set up session with other users.At this moment, need the S-CSCF identification information be carried out the differentiation of caller unregistered state, normal user registration state at the HSS place, like this, HSS can decide how to carry out subsequent treatment according to the login state of service-user, that is: when current called subscriber can reach for the application server of login state or callee side, HSS handles according to existing normal session processing procedure at present; Be the application server of caller unregistered state or callee side when unreachable current called subscriber, HSS handles according to the situation that present existing user is a unregistered state.HSS can not distinguished the S-CSCF identification information of its preservation yet, how oneself preserved at that time by the S-CSCF basis at the S-CSCF place and this subscriber-related routing iinformation handles if deciding, when S-CSCF preserved user's routing iinformation, S-CSCF directly transmitted the SIP conversation request message; As S-CSCF not during this user's routing iinformation, handle according to unregistered service, preserve as the SIP conversation request message being routed to a Voice Mailbox, notify afterwards this user Deng user Ke Da, perhaps the SIP conversation request message is redirected in the circuit-switched network of the current registration of user, perhaps when the user contracts unregistered service, return unsuccessful replying to the other side, current this user of indication the other side is unreachable.

Below in conjunction with accompanying drawing 2, with Invite message is that example describes service implementation method of the present invention.

Among Fig. 2, the application server that initiates a session request at step 1, replacement service-user transfers to I-CSCF with INVITE.

After receiving INVITE to step 2, I-CSCF, to the positional information of the current S-CSCF of HSS inquiry business user correspondence.

I-CSCF can send LIR (Location-Info-Request, location information request) message to HSS by Cx interface and realize route information query.

Receive the query messages of I-CSCF to step 3, HSS after, the name of the S-CSCF that distributed for this service-user is in the past returned to I-CSCF, perhaps the S-CSCF ability information collection when signatory returns to I-CSCF with service-user.

When HSS can be before determining distributes S-CSCF for this service-user, the identification information of S-CSCF is returned to I-CSCF, when HSS can this service-user distribute S-CSCF before determining, the S-CSCF ability information collection of this service-user is returned to I-CSCF.

HSS can return routing iinformation available among the HSS to I-CSCF by LIA (Location-Info-Answer location information answer) message.

If obtain the identification information of S-CSCF to step 4 I-CSCF from LIA message, then the I-CSCF S-CSCF ability information of carrying from LIA message is concentrated and is selected a S-CSCF to be this service-user service.

INVITE is transmitted to the S-CSCF of its selection to step 5, I-CSCF.

Send SAR (Server AssignmentRequest by Cx interface to HSS to step 6, S-CSCF, service assignment request) message, to HSS request download user request of data, the information spinner that carries in the SAR message will comprise: the service-user sign, as IMPU or PSI etc., S-CSCF name etc.

If S-CSCF has obtained the user data of service-user, i.e. user description information, then step 6 and following step 7 can be omitted.

Receive SAR message to step 7, HSS, and will serve and specify the name of the S-CSCF of service-user to preserve in the SAR message, simultaneously, HSS inquires about the user signing contract information of its storage according to the identification information of service-user, and return SAA (Server-Assignment-Answer to S-CSCF, the service assignment is replied) message is as affirmation, and the information of carrying in the SAA message comprises: the service-user descriptor, and security information etc.Service-user descriptor is wherein used when service-user is linked into the miscellaneous service controlling platform.

Receive SAA message to step 8, S-CSCF, and from SAA message, obtaining the service-user descriptor, S-CSCF sends to relevant professional controlling platform according to its filtering rule that obtains with log-on message and carries out suitable professional control procedure from professional user description information.

Continue to carry out the follow-up professional step that realizes to step 9, S-CSCF.

In the above-mentioned flow process, conversation request message is an INVITE, and conversation request message can also be other sip messages, as MESSAGE, OPTIONS, BYE, INFO, NOTIFY, PUBLISH, REFER, SUBSCRIBE, message such as UPDATE, various conversation request message can be applied in the business realizing mechanism of the present invention, replace service-user to initiate the SIP conversation request by application server and realize business.

Application server is when replacing service-user to initiate the SIP conversation request and getting access to the identification information of S-CSCF of service-user correspondence, application server can directly be sent to S-CSCF with the SIP conversation request message according to the identification information of its S-CSCF that gets access to, realizes follow-up business by S-CSCF.

When service-user is application server, also can not need the identification information of S-CSCF, directly the SIP conversation request message is forwarded to the purpose network as application server, promptly realize business by the DNS mechanism in the IP network.

Though described the present invention by embodiment, those of ordinary skills know, the present invention has many distortion and variation and do not break away from spirit of the present invention, and the claim of application documents of the present invention comprises these distortion and variation.

Claims

1, a kind of service implementation method based on IMS is characterized in that, comprising:

D, S-CSCF realize professional according to the conversation request message of its reception;

Described step a comprises:

2, a kind of service implementation method as claimed in claim 1 based on IMS, it is characterized in that the application server among the described step a is: the initiator that the professional initiation session of public service identity is used in the initiator of user's initiation session of replacement use public user identity or replacement.

3, a kind of service implementation method based on IMS as claimed in claim 1 or 2 is characterized in that described step b comprises:

4, a kind of service implementation method based on IMS as claimed in claim 3 is characterized in that:

When described by replacement side when using the user of public user identity, the S-CSCF information by the side's of replacementing correspondence of storing among the described HSS be by user's explicit registration process and/or Operation and Maintenance and/or HSS and and its being provided with alternately between the network entity of annexation arranged; Or

When described by replacement side when using public service identity professional, store among the described HSS by the S-CSCF information of replacement side be by Operation and Maintenance and/or HSS and and its mutual setting between network entity of annexation is arranged.

5, a kind of service implementation method based on IMS as claimed in claim 3 is characterized in that:

6, a kind of service implementation method based on IMS as claimed in claim 3 is characterized in that described step b1 comprises:

7, a kind of service implementation method based on IMS as claimed in claim 6 is characterized in that described step c comprises:

8, a kind of service implementation method based on IMS as claimed in claim 1 or 2 is characterized in that described steps d comprises:

9, a kind of service implementation method based on IMS as claimed in claim 8 is characterized in that described method also comprises:

10, a kind of service implementation method based on IMS as claimed in claim 9 is characterized in that described method also comprises:

HSS with the identification information of the S-CSCF of its storage and/or S-CSCF capability set message transmission to the network entity that annexation is arranged with it.

11, a kind of service implementation method based on IMS as claimed in claim 9 is characterized in that described method also comprises: