CN101931900A

CN101931900A - Method and system for realizing services of IP multi-media subsystem network

Info

Publication number: CN101931900A
Application number: CN2009101422527A
Authority: CN
Inventors: 陶全军; 郝振武; 谢振华
Original assignee: ZTE Corp
Current assignee: Global Innovation Polymerization LLC
Priority date: 2009-06-26
Filing date: 2009-06-26
Publication date: 2010-12-29
Anticipated expiration: 2029-06-26
Also published as: CN101931900B; WO2010148782A1

Abstract

The invention relates to a method for realizing services of an IP multi-media subsystem network, which comprises the following steps: receiving a roaming number (RN) request with a UE number sent by a UE home network in a roaming state, and returning the RN corresponding to the UE number and directing an LAS to the UE home network by a VSS; receiving an initial address message with a RN initiated by a calling party, and sending a conversation invitation message to the LAS through an S-CSCF by an MGCF, wherein the message carries a RN; taking the UE number as the called number by the LAS to replace the RN in the conversation invitation message, and sending the conversation invitation message to the S-CSCF; sending the conversation invitation message to a TAS by the S-CSCF to perform calling control in accordance with called event trigger standard of iFC; and performing the calling control by the TAS in accordance with local-storage UE user data, and sending the conversation invitation message to the UE by a P-CSCF after finishing the calling control.

Description

A kind of service implementation method of IP Multimedia System network and system

Technical field

The present invention relates to the communications field, relate in particular to the service implementation method and the system of a kind of IP (Internet Protocol, Internet Protocol) multi-media subsystem network.

Background technology

In order to keep third generation partner program (3rd Generation Partnership Project, abbreviate 3GPP as) in the competitiveness of moving communicating field, 3GPP is just endeavouring research at present to packet switched core network (Packet Switched Core, abbreviate PS Core as) and global system for mobile communications wireless access network (Universal Mobile Telecommunication System Radio Access Network, abbreviate UTRAN as) evolution, purpose is to make the PS Core (being called for short EPC) of evolution that higher transmission rate can be provided, shorter transmission delay, and support E-UTRAN (Evolved UTRAN, the UTRAN of evolution), GERAN (GSM EDGE radio access network, global system for mobile communications enhanced data rates global system for mobile communications evolution technology wireless access network), UTRAN, mobile management between WLAN (Wireless Local Area Network, WLAN (wireless local area network)) and other non-3 GPP access network network.The mobile communication system of this evolution is called as the grouping domain system (Evolved Packet System abbreviates EPS as) of evolution.

Present stage, speech business is the important revenue source of mobile operator, therefore, how to guarantee to realize that the high-quality speech business is extremely important in EPS.At present, everybody relatively pays close attention to and adopts voice-based Traditional IP IP multimedia subsystem, IMS (IMS) to realize speech business.

Fig. 1 is the IMS network architecture schematic diagram of prior art, comprises following network element:

101: subscriber equipment (User Equipment abbreviates UE as), the P-CSCF that is used for being linked into by access device the IMS network registers, and sets up session connection with far-end;

102: Proxy Call Session Control Function (Proxy Call Session Control Function abbreviates P-CSCF as) is used to carry out the route of message, and sets up Security Association with UE;

103: query call conversation control function (Interrogating Call Session Control Function, abbreviate I-CSCF as), be used for and HSS (Home Subscriber Server, home subscriber server) mutual, request HSS is that UE distributes S-CSCF, or the pairing S-CSCF of inquiring user;

104: service call conversation control function (Serving Call Session Control Function abbreviates S-CSCF as) is used to the user that functions such as registration, calling control are provided;

105: home subscriber server (HSS) is used to preserve user's subscription data, for calling out or session provides support.

Adopt framework shown in Figure 1, when user/UE was in roaming state, UE registered to home network by the P-CSCF that is linked into visit ground; After succeeding in registration, if user's initiation session business, UE sends session invitation message to home network, by the S-CSCF of home network the session invitation message is transmitted to the called subscriber, and session control is finished by home network.

Under the situation of IMS network partial deployment, if the user roams into the IMS network on visit ground, and the go-between between the IMS network on the IMS network of ownership place and visit ground is not disposed the IMS network, then might be (for example with the message of UE, registration message, session invitation message) be routed to home network, cause the IMS service fail; Equally, home network mails to the also possibly IMS network that can't be routed to visit ground of message (for example, session invitation message) of UE.

Summary of the invention

Technical problem to be solved by this invention is, overcomes the deficiencies in the prior art, and a kind of service implementation method and system that can realize calling out the IMS network of control to visitor at local IMS network is provided.

In order to address the above problem, the invention provides a kind of service implementation method of IP Multimedia System network, it is characterized in that, when the user equipment (UE) that is in roaming state by local IP Multimedia System IMS network Proxy Call Session Control Function P-CSCF and service call conversation control function S-CSCF after the visitor server VSS of local IMS network successfully registers, this method comprises:

After receiving the request of Providing Roaming Number of the number that carries described UE that the home network of described UE sends, the roaming number that described VSS will be corresponding with the number of described UE, point to the location server LAS of local IMS network returns to the home network of described UE;

After receiving the initial address message that carries described roaming number of calling party's initiation, the MGCF MGCF of local IMS network sends session invitation message by described S-CSCF to described LAS, carries described roaming number in this message;

Described LAS replaces described roaming number in the described session invitation message with the number of described UE as called number, and described session invitation message is sent to described S-CSCF;

Described S-CSCF calls out the telecommunication service application server TAS that described session invitation message sends to local IMS network to control according to the called event trigger standard of initial filter standard or norm iFC;

Described TAS calls out control according to the user data of the described UE of this locality storage, calls out by described P-CSCF described session invitation message to be sent to described UE after control is finished;

After described UE receives described session invitation message, send ALERTING message and response message, finish the foundation of IMS session service to the calling party;

Wherein, described TAS and LAS are two logical blocks among the local IMS application server LAS of two network element devices of local IMS network or local IMS network.

In addition, described VSS receives the described request back of Providing Roaming Number, before the home network of described UE returns described roaming number, and this method comprises: described VSS sends to described LAS and distributes the roaming number request, carries the number of described UE in this request; After receiving the request of described distribution roaming number, described LAS distributes described roaming number, preserves the number of described UE and the corresponding relation of described roaming number, and described roaming number is returned to described VSS;

After described LAS receives described session invitation message of carrying roaming number, replace before the described roaming number, this method also comprises: described LAS obtains the number of described UE according to the corresponding relation of the number of the described UE that preserves and described roaming number.

In addition, described VSS receives the described request back of Providing Roaming Number, before the home network of described UE returns described roaming number, this method also comprises: described VSS distributes described roaming number, and preserves the number of described UE and the corresponding relation of described roaming number;

After described LAS receives described session invitation message of carrying roaming number, replace before the described roaming number, this method also comprises: described LAS sends to described VSS and obtains called number message, carries described roaming number in this message; Receive described obtain called number message after, described VSS obtains the number of described UE according to the corresponding relation of the number of described UE and described roaming number, and it is returned to described LAS.

In addition, described iFC is generated by described VSS; Described VSS sends to described S-CSCF with described iFC in the following way:

In the registration process of described UE, receive the register requirement that described S-CSCF sends after, described VSS sends registration reply message to described S-CSCF, comprises described iFC in this message.

In addition, comprise the registered events trigger criteria among the described iFC;

Described TAS obtains described user data in the following way:

After described S-CSCF receives described registration reply message, send third-party registration request, the user ID of carrying described UE in this request to described TAS according to the registered events trigger criteria among the described iFC;

After receiving described third-party registration request, described TAS sends to described VSS and obtains subscriber data message, the user ID of carrying described UE in this message;

Receive described obtain subscriber data message after, described VSS returns to described TAS with the described user data of this locality storage.

In addition, described VSS obtains and stores the user data of described UE in the following way:

In the registration process of described UE, after described VSS receives the register requirement that described S-CSCF sends, send position updating request to the HSS or the HLR of the home network of described UE, to obtain the user data of described UE;

After receiving described position updating request, described HLR or HSS return to described VSS with the user data of described UE;

Described VSS stores the user data of described UE.

The present invention also provides a kind of business realizing system of IP Multimedia System network, and this system provides professional as visited network for the UE that is in roaming state; This system comprises: P-CSCF, S-CSCF, VSS, MGCF, LAS and TAS; Wherein:

Described VSS is used for after the request of Providing Roaming Number of the number that carries described UE that the home network that receives described UE sends, and roaming number will be corresponding with the number of described UE, that point to described LAS returns to the home network of described UE;

Described MGCF is used for sending session invitation message by described S-CSCF to described LAS behind the initial address message that carries described roaming number that receives calling party's initiation, carries described roaming number in this message;

Described LAS is used for the number of described UE is replaced the described roaming number of described session invitation message as called number, and described session invitation message is sent to described S-CSCF;

Described S-CSCF is used for called event trigger standard according to iFC and described session invitation message is sent to described TAS calls out control;

Described TAS also is used for calling out control according to the user data of the described UE of this locality storage, calls out by described P-CSCF described session invitation message to be sent to described UE after control is finished;

Wherein, described TAS and LAS are two logical blocks among the LAS of two network element devices of local IMS network or local IMS network.

In addition, described VSS also is used for after receiving the described request of Providing Roaming Number, before the home network of described UE returns described roaming number, sends to described LAS and distributes the roaming number request, carries the number of described UE in this request;

Described LAS also is used for distributing described roaming number after receiving the request of described distribution roaming number, preserves the number of described UE and the corresponding relation of described roaming number, and described roaming number is returned to described VSS.

In addition, described VSS also is used for distributing described roaming number, and preserving the number of described UE and the corresponding relation of described roaming number after receiving the described request of Providing Roaming Number, before the home network of described UE returns described roaming number;

Described LAS also is used for after receiving described session invitation message of carrying roaming number, replace described roaming number before, send to described VSS and to obtain called number message, carry described roaming number in this message;

Described VSS also be used for receive described obtain called number message after, obtain the number of described UE according to the corresponding relation of the number of described UE and described roaming number, and it returned to described LAS.

In addition, described VSS also is used to generate described iFC, and in the following way described iFC is sent to described S-CSCF:

In addition, described S-CSCF also is used for after receiving described registration reply message, sends third-party registration request, the user ID of carrying described UE in this request according to the registered events trigger criteria among the described iFC to described TAS;

Described TAS also is used for after receiving described third-party registration request, sends to described VSS and obtains subscriber data message, the user ID of carrying described UE in this message;

Described VSS also be used for receive described obtain subscriber data message after, the described user data of this locality storage is returned to described TAS.

In addition, described VSS also is used for the registration process at described UE, after receiving the register requirement that described S-CSCF sends, sends position updating request to the HSS or the HLR of the home network of described UE, to obtain the user data of described UE; And store the user data of the described UE that described HLR or HSS return.

In sum, adopt method and system of the present invention, visitor is after local IMS network is successfully registered, local IMS network uses local storage user data that control is called out in this calling when receiving this user's final call request, and need not to call out control by the S-CSCF of this user attaching network, improved service quality, avoided under the situation of IMS network partial deployment, user's home network can't be routed to the final call request of visitor visited network (local IMS network) and the problem of the service fail that causes.

Description of drawings

Fig. 1 is the IMS network architecture schematic diagram of prior art;

Fig. 2 is the Organization Chart one of the business realizing system of embodiment of the invention IMS network;

Fig. 2 a is the Organization Chart two of the business realizing system of embodiment of the invention IMS network;

Fig. 3 is the Organization Chart three of the business realizing system of embodiment of the invention IMS network;

Fig. 4 carries out the process registration flow chart for adopting system architecture of the present invention;

Fig. 5 a inserts local IMS network, when initiating registration by local IMS network, selects the first method flow chart of local IMS network for this UE/ user as UE;

Fig. 5 b inserts local IMS network, when initiating registration by local IMS network, selects the second method flow chart of local IMS network for the user of this UE as UE;

Fig. 5 c inserts local IMS network, when initiating registration by local IMS network, is selected the method flow diagram of local IMS network by UE as UE;

Fig. 5 d is that VSS receives the method flow diagram that obtains the IMSI of respective user after the login request message;

Fig. 6 is the Organization Chart four of the business realizing system of embodiment of the invention IMS network;

Fig. 7 works the method flow diagram of exhaling for adopting system architecture of the present invention;

Fig. 8 carries out the method flow diagram of exhaling eventually for adopting system architecture of the present invention.

Embodiment

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

Fig. 2 is the Organization Chart one of the business realizing system of embodiment of the invention IMS network, comprising:

201: subscriber equipment (User Equipment abbreviates UE as);

202: local IMS application server (Localised IMS Application Server abbreviates LI AS as);

203: visitor server (Visitor Subscriber Server abbreviates VSS as);

204: CSCF (Call Session Control Function abbreviates CSCF as);

205: attaching position register (Home Location Register abbreviates HLR as) or home subscriber server (Home Subscriber Server abbreviates HSS as).

Fig. 2 a is the Organization Chart two of the business realizing system of embodiment of the invention IMS network, among Fig. 2 a LI AS further is subdivided into TAS (Telephony Application Server, the telecommunication service application server) and LAS (Location AS, location server), other network element is identical with Fig. 2.

Among Fig. 2 and Fig. 2 a:

Subscriber equipment (UE) possesses the IMS ability, supports Session Initiation Protocol, is used for being linked into local IMS network (being visited network) by access network under roaming state and registers, and set up session connection with far-end.

The network element that local IMS application server (LI AS) increases newly for the present invention, this network element can be understood as a logical functional entity, can close with other AS (application server) and establish.

LI AS is mainly used in the user agent and calls out control; Wherein:

When the user under being in roaming state (being called visitor) initiated registration, LI AS was used for obtaining and preserve user data from VSS;

Call for when asking receiving rising of visitor, LI AS is used for calling out control according to the business datum of user data;

When receiving the final call request of visitor, LI AS is used to distribute the roaming number corresponding with called number that points to this locality, or obtains corresponding called number according to the roaming number that VSS distributes to VSS; And after receiving session invitation message, the use called number is replaced the roaming number in this message, and the session invitation message is routed to visitor.

LI AS can be further divided into telecommunication service application server (TAS) and location server (LAS) according to function, and the two can close and establish also and can separately dispose, when separately disposing shown in Fig. 2 a, wherein:

TAS is used to finish calling control;

LAS is used to distribute the roaming number that points to TAS, perhaps uses the roaming number of the sensing TAS of VSS distribution to obtain corresponding called number from VSS.

Interface between TAS and LAS and the VSS can adopt the Sh mouth of standard.Can adopt the ISC mouth of standard between TAS and LAS and the S-CSCF.

Visitor server (VSS) also is the network element that the present invention increases newly, the function of its realization is similar to HSS, difference is: VSS is used for when receiving the register requirement of visitor, obtain this user data of users from the HSS or the HLR of this visitor home network, store the user data that gets access to, and provide its storage user data to LI AS.

In addition, VSS also possesses following function:

Can obtain IMSI International Mobile Subscriber Identity (IMSI) according to the private user identity in the login request message;

Circuit domain service data is converted to the IMS business datum;

The trigger criteria of generation LI AS (Initial Filter Criteria, iFC) with the triggering address, notice S-CSCF carries out third-party registration;

After receiving the request of Providing Roaming Number, VSS distributes the roaming number that points to LI AS, and concerns between preservation roaming number and the called number, and roaming number is returned to HSS/HLR in the success back; Perhaps, ask for roaming number to LI AS, ask for successfully after, return roaming number to HSS/HLR;

Receive that LI AS sends obtain the called number request time, roaming number and called number corresponding relation according to preserving find called number, and return to LI AS.

CSCF can be further divided into: query call conversation control function (Interrogating CSCF, abbreviate I-CSCF as), Proxy Call Session Control Function (Proxy Call Session Control Function, abbreviate P-CSCF as) and service call conversation control function (Serving CSCF abbreviates S-CSCF as).Wherein:

I-CSCF is used for VSS mutual, and request VSS distributes S-CSCF for the user, or the residing S-CSCF of inquiring user;

P-CSCF is used to carry out the route of message, and sets up Security Association with terminal;

S-CSCF is used to the user that functions such as registration, calling control are provided.

HSS/HLR is used to preserve user's subscription data, for calling out or session provides support, and when receiving the position updating request that VSS sends user data is returned to VSS.

HLR can think the subclass of HSS, be traditional CS (Circuit Switched, circuit switching) territory and PS (Packet Swithed, packet switching) territory service, HLR can unify with HSS, is positioned at same physical entity, also can be positioned on the different entities, exist interface between HLR and the HSS this moment, realizes the mutual of information.

Fig. 3 is the Organization Chart three of the business realizing system of embodiment of the invention IMS network, comprise the operation system that adopts IMS network of the present invention in this Organization Chart and registered related network element, wherein show each network element in the abridged access network part among Fig. 2 and Fig. 2 a: Mobility Management Entity (Mobility Management Entity, abbreviate MME as), gateway (Serving Gateway, abbreviate S-GW as), packet data network gateway (Packet DataNetwork Gateway, be called for short PDNGW or P-GW), Dynamic Host Configuration Protocol server (Dynamic Host Configuration Protocol Server abbreviates DHCP Server as); And show abridged domain name system among Fig. 2 and Fig. 2 a (Domain Name System abbreviates DNS as); And CSCF further is subdivided into P-CSCF, I-CSCF and S-CSCF; Wherein:

Mobility Management Entity (MME) is the chain of command entity, be used for interim storing subscriber information, and be in charge of and store the UE context (such as the UE/ user ID, mobility management states, user security parameters etc.), for the user distributes temporary mark, when quartering at this tracing area or this network, is responsible for UE this user is carried out authentication;

Gateway (S-GW) is a user entity, is responsible for carrying out the route processing of user face data;

Packet data network gateway (P-GW) is the gateway that UE inserts PDN (Packet Data Network, Packet Data Network); When P-GW receive that UE sends obtain P-CSCF full name message the time, will return to UE from P-CSCF full name that Dynamic Host Configuration Protocol server gets access to.

P-GW and S-GW can close and be located in the physical entity.

Domain name system (DNS) is used for domain name is translated as corresponding IP address.

Dynamic Host Configuration Protocol server (DHCP Server) is used for P-CSCF full name or address dynamically are provided, and dns address is provided.

The concrete function of each network element shown in Figure 3 also will be described in more detail below.

Fig. 4 carries out the process registration flow chart for adopting system architecture of the present invention; In this flow process, after VSS receives the login request message that S-CSCF transmits,, then initiate position updating request, to obtain user data to HSS/HLR if there is not corresponding user data among the VSS; After user data obtains successfully, return registration reply to S-CSCF, comprise LI AS trigger criteria in this response message and (be also referred to as initial filter standard or norm, be Initial Filter Criteria, abbreviate iFC as) and trigger the address, trigger S-CSCF by LI AS trigger criteria and carry out third-party registration; As shown in Figure 4, this method comprises the steps:

401, UE sends login request message to the P-CSCF of local IMS network (be the P-CSCF of visited network, abbreviate local P-CSCF as) under roaming state, carries User Identity in this message;

402, after local P-CSCF receives login request message, this forwards is given the I-CSCF (be the I-CSCF of visited network, abbreviate local I-CSCF as) of local IMS network;

Can adopt several different methods that above-mentioned login request message is transmitted to local I-CSCF among the present invention, particular content can vide infra to the description part of Fig. 5 a～5c.

403, after local I-CSCF receives login request message, send query messages to the VSS of local IMS network, with the address of inquiry S-CSCF;

404, VSS assigns the address of the S-CSCF (abbreviating local S-CSCF as) of a local IMS network, and it is returned to local I-CSCF;

405, local I-CSCF sends login request message to local S-CSCF;

406, after local S-CSCF receives login request message, send login request message to VSS;

407, receive login request message after, if there is not corresponding user data among the VSS, then send position updating request, to obtain user data to the HSS/HLR of UE home network;

If corresponding user data is arranged among the VSS, then VSS is designated UE (user) registered, and return registration reply message to local S-CSCF, carry LI AS trigger criteria in this message and (be also referred to as initial filter standard or norm, be Initial Filter Criteria, abbreviate iFC as) and trigger address (being the address of LI AS), and jump to step 412;

Comprise in the above-mentioned LI AS trigger criteria: the trigger criteria of incidents such as registered events, caller incident, called event.Wherein, the trigger criteria of registered events can trigger local S-CSCF and carries out third-party registration.

Comprise in the user data: information such as customer position information, CAMEL-Subscription-Information, business datum.

In this step, VSS need use user's IMSI (International Mobile Subscriber Identifier, international mobile subscriber identity) obtains user data, if the user ID in the login request message is not IMSI, then VSS can adopt several different methods to obtain user's IMSI, and concrete grammar can vide infra to the description part of Fig. 5 d.

408, HSS/HLR sends to VSS and inserts user data requests, carries the user data of respective user in this message, comprises the user in the user data circuit domain business data signed (abbreviating user's circuit domain service data as);

409, VSS preserves the user data that receives, and returns user data to HSS/HLR and inserts response message;

410, after HSS/HLR receives that the user data of VSS transmission inserts response message, upgrade response message to the VSS home position;

411, after VSS receives position update response information, (for example convert the circuit domain service data in the user data to local IMS business datum, carry out the conversion between the heterogeneous networks form), perhaps do not carry out above-mentioned conversion, preparation is downloaded in subsequent step and is given LI AS, by LI AS circuit domain service data is resolved; The VSS identifying user is registered, and returns registration reply message to local S-CSCF, carries LI AS trigger criteria (being iFC) in this message and triggers address (being the address of LI AS);

Comprise in the above-mentioned LI AS trigger criteria: the trigger criteria of incidents such as registered events, caller incident, called event.Wherein, the trigger criteria of registered events will trigger S-CSCF and carry out third-party registration.

412～414, local S-CSCF sends registration to UE and finishes message, and notice UE succeeds in registration;

415, local S-CSCF sends the third-party registration request according to the registered events trigger criteria among the iFC to LI AS, carries user ID in this request;

In addition, the address that can also carry VSS in the third-party registration request.

416, after LI AS receives the third-party registration request, obtain subscriber data message to the VSS transmission,, carry user ID in this message to obtain user data according to VSS address of wherein carrying or the local VSS address that disposes;

417, VSS returns the user data that obtains in step 408 to LI AS;

Comprise the local IMS business datum or the non-switched circuit domain service data that have carried out above-mentioned conversion in the above-mentioned user data.

418, after LI AS preserved user data, LI AS returned registration to local S-CSCF and finishes message;

If comprise non-switched circuit domain service data in the user data, LI AS need convert thereof into local IMS business datum in subsequent step, or directly resolves and use circuit domain service data to call out control.

It should be noted that the LIAS among Fig. 4 refers in particular to TAS when LI AS is made up of TAS and two network elements of LAS.

Fig. 5 a inserts local IMS network, when initiating registration by local IMS network, selects first method (promptly the login request message that receives being transmitted to the method for local I-CSCF in the step 402) flow chart of local IMS network for this UE/ user as UE.In this flow process, be that the user selects local IMS network by the access network element P-CSCF of local IMS network.

In the prior art, P-CSCF can be transmitted to login request message the I-CSCF of home network according to the home domain name of carrying in this message after receiving login request message; And in the present embodiment, P-CSCF can according to carrier policy, directly be routed to local I-CSCF to login request message after receiving login request message, selects local VSS to register by local I-CSCF.

Shown in Fig. 5 a, this method specifically comprises following steps:

5a01 (being step 401), UE send login request message to local P-CSCF, carry home domain name and User Identity in this message;

5a02, receive login request message after, P-CSCF is according to User Identity and carrier policy, judge whether to select local IMS network (judging whether that promptly the login request message that will receive is transmitted to local I-CSCF and handles), concrete judgement and selection strategy can be:

All select local I-CSCF to transmit login request message (be about to local I-CSCF and be configured to unconditionally select local IMS network) for all users; Or

Judge according to operator's signing IMS interconnection agreement and User Identity whether respective user has signed the IMS interconnection agreement, select local I-CSCF to transmit login request message per family for the usefulness of not signing the IMS interconnection agreement; Can select the I-CSCF of this user attaching network to transmit login request message for the user who signs the IMS interconnection agreement.

5a03, when judge to need selecting local I-CSCF (promptly selecting local IMS network to carry out this locality registration), P-CSCF is to local I-CSCF forwarding login request message.

Fig. 5 b inserts local IMS network, when initiating registration by local IMS network, selects second method (promptly the login request message that receives being transmitted to the method for local I-CSCF in the step 402) flow chart of local IMS network for the user of this UE as UE.In this flow process, be that the user selects local IMS network by DNS.

In the prior art, P-CSCF need be according to the I-CSCF address of the home domain name of carrying in this message to DNS inquiring user ownership place after receiving login request message, and DNS can translate into this home domain name the address of the I-CSCF of a home network; And in the present embodiment, DNS can translate into home domain name the I-CSCF address of local IMS network according to carrier policy.

Shown in Fig. 5 b, this method specifically comprises following steps:

5b01 (being step 401), UE send login request message to local P-CSCF, carry home domain name and User Identity in this message;

5b02, receive login request message after, P-CSCF sends I-CSCF address lookup message to local dns, with the address of the I-CSCF of inquiry home network, carries the home domain name of carrying in the login request message in this query messages;

After 5b03, DNS receive above-mentioned query messages, carry out following processing according to carrier policy:

All home domain name are all translated into local I-CSCF address; Or

Sign the IMS interconnection agreement according to operator and judge whether the operator of the network of home domain name correspondence has signed the IMS interconnection agreement, and the home domain name that will not sign the network of IMS interconnection agreement all is translated as local I-CSCF address; The home domain name of signing the network of IMS interconnection agreement is translated into the address of the I-CSCF of corresponding home network;

5b04, DNS return to P-CSCF with the I-CSCF address.

Fig. 5 c inserts local IMS network, when initiating registration by local IMS network, is selected method (promptly making local P-CSCF in the step 402 login request message that receives is transmitted to the method for the local I-CSCF) flow chart of local IMS network by UE as UE.In this flow process, after UE obtains P-CSCF full name, home domain name is set according to P-CSCF full name.Flow process shown in Fig. 5 c occurs in before the step 401, specifically comprises following steps:

5c01, UE send to P-GW and obtain P-CSCF full name message;

5c02, P-GW are to Dynamic Host Configuration Protocol server acquisition request P-CSCF full name;

5c03, Dynamic Host Configuration Protocol server return P-CSCF full name to P-GW;

5c04, P-GW return P-CSCF full name to UE;

After 5c05, UE receive P-CSCF full name,, then home domain name (soon the character string after " @ " character is set to home domain name in P-CSCF full name) is set according to P-CSCF full name if wish to use local IMS business; After this, in the login request message of UE in step 401 this home domain name is included in the login request message and registers, in step 402, local P-CSCF gives local I-CSCF according to the home domain name in the login request message with this forwards.

Fig. 5 d is that VSS receives the method flow diagram that obtains the IMSI of respective user after the login request message; This flow process has been described in the step 407 of Fig. 4, and VSS receives the method for obtaining the IMSI of respective user after the login request message, and shown in Fig. 5 d, this method comprises the steps:

5d01, receive login request message after, VSS extracts the user ID in this message, and judges whether user ID is IMSI, if not, execution in step 5d02 then, otherwise this flow process finishes;

If the 5d02 user ID is not IMSI, then VSS one of can be in the following way obtains corresponding IMSI:

Mode one: comprise following substep:

A1: if the interim private user identity that user ID is to use IMSI to derive, then VSS oppositely derives to interim private user identity, draws corresponding IMSI; Or

Mode two: comprise following substep:

B1: if user ID is the IMS private user identity, VSS can send the refusal registration message to UE, refuse this registration, and in this message, comprise the information that the indication user uses IMSI or uses the interim private user identity derived by IMSI to register;

After b2:UE receives the refusal registration message, use IMSI or use the interim private user identity of deriving by IMSI to initiate registration again according to the above-mentioned information that comprises in this message;

B3: after receiving the register requirement that UE resends, VSS obtains IMSI or obtains interim private user identity and it is oppositely derived from this request and obtains corresponding IMSI from this request; Or

Mode three: comprise following substep:

C1:VSS to UE send that SIP (Session Initial Protocol, initial session protocol) subscribes to or the SIP query messages to obtain the IMSI of UE;

C2:UE returns user IMSI to VSS after receiving sip subscribe or SIP query messages; Or mode four: comprise following substep:

D1:VSS uses the IMS private user identity that carries in the register requirement to obtain corresponding IMSI to the HSS of UE home network;

D2:HSS returns the IMSI of IMS private user identity binding to VSS.

Fig. 6 is the Organization Chart four of the business realizing system of embodiment of the invention IMS network, related network element when having comprised the business realizing system that adopts IMS network of the present invention in this Organization Chart and calling out wherein shows each network element in the abridged access network part among Fig. 2 and Fig. 2 a: Mobility Management Entity (MME), gateway (S-GW), packet data network gateway (P-GW); CSCF further is subdivided into P-CSCF and S-CSCF; And increased abridged IMS network element among Fig. 2 and Fig. 2 a: MGCF (Media Gateway Control Function abbreviates MGCF as); In addition, also show the network element that the CS network among Fig. 2 and Fig. 2 a is comprised in this Organization Chart: media gateway (Media Gateway, abbreviate MGW as), gateway MSC (Gateway Mobile Switching Center, abbreviate GMSC as), public switch telephone network (Public Switched Telephone Network abbreviates PSTN as); Wherein:

MGCF (MGCF) is used to carry out medium control and signaling protocol conversion;

Media gateway (MGW) is used to provide media bearer;

Gateway MSC (GMSC) is used for carrying out signalling route when receiving initial address message;

(Public Switched Telephone Network PSTN), refers to fixed telephone network here to public switch telephone network.

The concrete function of each network element shown in Figure 6 also will be described in more detail below.

Fig. 7 works the method flow diagram of exhaling for adopting system architecture of the present invention; Exhale in the process rising, to call out control and finish, specifically to comprise the steps: by the TAS among the LI AS

701, the UE that successfully carries out local registration carries called number and dialing number information to local P-CSCF transmission session invitation message in this message;

702, local P-CSCF transmits session invitation message according to the routing iinformation that writes down in this UE registration process to local S-CSCF;

703, receive session invitation message after, it (is that local S-CSCF does not call out control that local S-CSCF triggers third party call control according to the caller event trigger standard among the iFC, and call out control by LI AS), session invitation message is routed to LI AS;

704, the TAS among the LI AS (for example calls out control according to the user data that obtains in this UE registration process to calling, judge whether to allow this UE to make a call), call out and after control is finished the session invitation message is routed to local S-CSCF, local S-CSCF is routed to MGCF according to called number with the session invitation message;

705, MGCF carries out number analysis to called number, knows that the called subscriber is the user among the PSTN, therefore sends initial address message (IAM) to PSTN, carries called number and dialing number information in this message;

706, PSTN finishes message (ACM) to IMS network return address when the called user terminal ring;

707～708, MGCF sends ALERTING message by local S-CSCF to UE after receiving ACM message;

Wherein, local S-CSCF is transmitted to LI AS according to the called event trigger standard among the iFC with the ALERTING message that receives, and LI AS sends to UE with this ALERTING message by local S-CSCF after finishing and calling out control again.

709, after the called subscriber among the PSTN connects, send response message (ANM) to MGCF;

710～713, MGCF sends response message by S-CSCF to UE, notice UE call establishment;

Wherein, local S-CSCF is transmitted to LI AS according to the called event trigger standard among the iFC with the response message that receives, and LI AS sends to UE with this response message by local S-CSCF after finishing and calling out control again.

It should be noted that the LIAS among Fig. 7 refers in particular to TAS when LI AS is made up of TAS and two network elements of LAS.

Fig. 8 carries out the method flow diagram of exhaling eventually for adopting system architecture of the present invention; Exhaling in the process eventually, receive the request of Providing Roaming Number that HSS/HLR sends after, VSS distributes a roaming number that points to LAS according to this locality configuration, or sends to LAS and to distribute the roaming number request, by LAS according to own configuration distribution roaming number; VSS sends to GMSC with roaming number by HSS/HLR, and GMSC uses the roaming number that points to LAS to finish the follow-up flow process of exhaling eventually.In the present embodiment, LAS and TAS are the logical functional entity of LI AS, can close and establish also and can set up separately.Method shown in Figure 8 comprises the steps:

When 801, PSTN called out the UE (called subscriber) roamed into local IMS system, PSTN sent initial address message (IAM) to the GMSC of this called subscriber's home network, carries calling number and called number (being the number of UE) in this message;

802, after the GMSC of user attaching network receives initial address message, send route requests to the HSS/HLR of called subscriber's home network, to obtain called subscriber's routing iinformation;

803, HSS/HLR knows that according to the position updating request (step 507) that is sent by VSS in called subscriber (UE) registration process called subscriber's current roaming is in the local IMS network of VSS administration, therefore send the request of Providing Roaming Number to VSS, wherein comprise called number;

804, receive the request of Providing Roaming Number after, the LAS of VSS in LI AS send to distribute the roaming number request, carries called number in this request;

805, LAS distributes a roaming number that points to this equipment, preserves the corresponding relation of called number and roaming number, and roaming number is returned to VSS;

In addition, VSS also can oneself distribute a roaming number that points to LAS, preserves the corresponding relation of roaming number and called number.In this case, step 804 and 805 can not carried out.

806～807, VSS returns to HSS/HLR to the roaming number that points to LAS, and HSS/HLR returns to GMSC with it;

808, GMSC sends initial address message (IAM) to MGCF, so that route the call to MGCF, carries above-mentioned roaming number and dialing number information in this message;

809～810, MGCF will talk about according to roaming number and be routed to LAS (promptly sending session invitation message by S-CSCF to LAS);

811～812, after LAS receives session invitation message,, then send and obtain the called number request message, to obtain called number to VSS if judge the roaming number that comprises non-LAS distribution in the session invitation message; Above-mentioned obtaining in the called number message comprises roaming number; The called number that VSS preserves before finding according to roaming number returns to LAS with it;

In addition, after LAS receives session invitation message, if judge that the roaming number in the session invitation message is the roaming number that this LAS distributes, the called number of preserving before then finding according to this roaming number; In this case, do not need execution in step 811～812.

813, LAS uses the roaming number in the called number replacement session invitation message, sends session invitation message by S-CSCF to the called subscriber, to set up session, carries called number and dialing number information in this message;

814, S-CSCF triggers third party call control (promptly transfer to TAS and call out control) according to the called event trigger standard among the iFC, and the session invitation message is sent to TAS;

815～816, after calling control was finished, TAS sent session invitation message by P-CSCF to called UE;

817, UE sends ALERTING message to MGCF;

Wherein, ALERTING message still sends to MGCF via LI AS.

818～819, receive ALERTING message after, MGCF sends the address by GMSC to the PSTN at calling subscriber place and finishes message (ACM);

820, after the called subscriber answered, UE sent response message to MGCF;

Wherein, response message still sends to MGCF via LI AS.

821～822, MGCF sends response message (ANM) by GMSC to the PSTN at calling subscriber place.

Claims

1. the service implementation method of an IP Multimedia System network, it is characterized in that, when the user equipment (UE) that is in roaming state by local IP Multimedia System IMS network Proxy Call Session Control Function P-CSCF and service call conversation control function S-CSCF after the visitor server VSS of local IMS network successfully registers, this method comprises:

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

Described VSS receives the described request back of Providing Roaming Number, before the home network of described UE returns described roaming number, this method comprises: described VSS sends to described LAS and distributes the roaming number request, carries the number of described UE in this request; After receiving the request of described distribution roaming number, described LAS distributes described roaming number, preserves the number of described UE and the corresponding relation of described roaming number, and described roaming number is returned to described VSS;

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

Described VSS receives the described request back of Providing Roaming Number, before the home network of described UE returns described roaming number, this method also comprises: described VSS distributes described roaming number, and preserves the number of described UE and the corresponding relation of described roaming number;

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

Described iFC is generated by described VSS; Described VSS sends to described S-CSCF with described iFC in the following way:

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

Comprise the registered events trigger criteria among the described iFC;

Described TAS obtains described user data in the following way:

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

Described VSS obtains and stores the user data of described UE in the following way:

Described VSS stores the user data of described UE.

7. the business realizing system of an IP Multimedia System network, this system provides professional as visited network for the UE that is in roaming state; This system comprises: P-CSCF, S-CSCF, VSS, MGCF, LAS and TAS; Wherein:

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

Described VSS also is used for after receiving the described request of Providing Roaming Number, before the home network of described UE returns described roaming number, sends to described LAS and distributes the roaming number request, carries the number of described UE in this request;

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

Described VSS also is used for distributing described roaming number, and preserving the number of described UE and the corresponding relation of described roaming number after receiving the described request of Providing Roaming Number, before the home network of described UE returns described roaming number;

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

Described VSS also is used to generate described iFC, and in the following way described iFC is sent to described S-CSCF:

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

Described S-CSCF also is used for after receiving described registration reply message, sends third-party registration request, the user ID of carrying described UE in this request according to the registered events trigger criteria among the described iFC to described TAS;

12. system as claimed in claim 11 is characterized in that,

Described VSS also is used for the registration process at described UE, after receiving the register requirement that described S-CSCF sends, sends position updating request to the HSS or the HLR of the home network of described UE, to obtain the user data of described UE; And store the user data of the described UE that described HLR or HSS return.