CN101931900B

CN101931900B - Method and system for realizing services of IP multi-media subsystem network

Info

Publication number: CN101931900B
Application number: CN200910142252.7A
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: 2014-03-19
Anticipated expiration: 2029-06-26
Also published as: CN101931900A; 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 a kind of IP(Internet Protocol, Internet Protocol) service implementation method and the system of multi-media subsystem network.

Background technology

In order to keep third generation partner program (3rd Generation Partnership Project, referred to as 3GPP) in the competitiveness of moving communicating field, 3GPP is just endeavouring research at present to packet switched core network (Packet Switched Core, referred to as PS Core) and global system for mobile communications wireless access network (Universal Mobile Telecommunication System Radio Access Network, referred to as UTRAN) evolution, object is to make the PS Core(of evolution be called for short EPC) 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, WLAN(Wireless Local Area Network, WLAN (wireless local area network)) mobile management and between other non-3 GPP access network network.The mobile communication system of this evolution is called as the grouping domain system (Evolved Packet System, referred to as EPS) of evolution.

Present stage, speech business is an important revenue source of mobile operator, therefore, how to guarantee in EPS, realizing high-quality speech business extremely important.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, referred to as UE), for be linked into the P-CSCF of IMS network by access device, register, and set up session connection with far-end;

102: Proxy Call Session Control Function (Proxy Call Session Control Function, referred to as P-CSCF), for carrying out the route of message, and set up Security Association with UE;

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

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

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

Adopt the framework shown in Fig. 1, when user/UE is during in roaming state, UE registers to home network by being linked into the P-CSCF of visited place; 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, session invitation message is transmitted to called subscriber, and session control is completed by home network.

The in the situation that of IMS network partial deployment, if user roams into the IMS network of visited place, and go-between between the IMS network of ownership place and the IMS network of visited place is not disposed IMS network, likely cannot be by the message of UE (for example, registration message, session invitation message) be routed to home network, cause IMS service fail; Equally, the message (for example, session invitation message) that home network mails to UE also possibly cannot be routed to the IMS network of visited place.

Summary of the invention

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

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) in roaming state, by Proxy Call Session Control Function P-CSCF and the service call conversation control function S-CSCF of local IP Multimedia System IMS network, when the visitor server VSS of local IMS network success registration request, the user data that obtains this user from HSS or the HLR of this visitor home network, the user data that storage gets, and to LI AS, provide the user data of its storage, the method comprises:

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

Receive after 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 the described roaming number in described session invitation message using the number of described UE as called number, and described session invitation message is sent to described S-CSCF;

Described S-CSCF sends to the telecommunication service application server TAS of local IMS network to call out control described session invitation message 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, and calling sends to described UE by described P-CSCF by described session invitation message after having controlled;

Described UE receives after described session invitation message, to calling party, sends ALERTING message and response message, completes the foundation of IMS session service;

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

In addition,, before returning to described roaming number after the request of Providing Roaming Number described in described VSS receives, to the home network of described UE, the method comprises: described VSS sends and distributes roaming number request to described LAS, carries the number of described UE in this request; Receive after 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;

Before carrying after the session invitation message of roaming number described in described LAS receives, replacing described roaming number, the method also comprises: the number that described LAS obtains described UE according to the number of described UE of preserving and the corresponding relation of described roaming number.

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

Before carrying after the session invitation message of roaming number described in described LAS receives, replacing described roaming number, the method also comprises: described LAS sends and obtains called number message to described VSS, carries described roaming number in this message; Described in receiving, obtain after called number message, described VSS obtains the number of described UE according to the corresponding relation of the number of described UE and described roaming number, and is returned to described LAS.

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

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

In addition, in described iFC, comprise registered events trigger criteria;

Described TAS obtains described user data in the following way:

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

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

Described in receiving, obtain after subscriber data message, described VSS returns to described TAS by 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, when described VSS receives after the registration request that described S-CSCF sends, to HSS or the HLR of the home network of described UE, send position updating request, to obtain the user data of described UE;

Receive after described position updating request, described HLR or HSS return to described VSS by 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 business as visited network for the UE in roaming state; This system comprises: P-CSCF, S-CSCF, VSS, MGCF, LAS and TAS; When the user equipment (UE) in roaming state, by Proxy Call Session Control Function P-CSCF and the service call conversation control function S-CSCF of local IP Multimedia System IMS network, when the visitor server VSS of local IMS network success registration request, the user data that obtains this user from HSS or the HLR of this visitor home network, store the user data getting, and the user data of its storage is provided to LI AS; Wherein:

After the request of Providing Roaming Number of the number that carries described UE that described VSS sends for the home network receiving described UE, the roaming number corresponding, that point to described LAS of the number with described UE is returned to the home network of described UE;

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

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

Described S-CSCF is for sending to described TAS to call out control described session invitation message according to the called event trigger standard of iFC;

Described TAS is also for calling out control according to the user data of the described UE of this locality storage, and calling sends to described UE by described P-CSCF by described session invitation message after having controlled;

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

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

Described LAS also, for after receiving the request of described distribution roaming number, 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.

In addition, described VSS also, for return to described roaming number after the request of Providing Roaming Number described in receiving, to the home network of described UE before, distributes described roaming number, and preserves the number of described UE and the corresponding relation of described roaming number;

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

Described VSS also, for after obtaining called number message described in receiving, obtains the number of described UE according to the corresponding relation of the number of described UE and described roaming number, and is returned to described LAS.

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

In addition, described S-CSCF, also 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 in described iFC to described TAS;

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

Described VSS, also for obtaining described in receiving after subscriber data message, returns to described TAS by the described user data of this locality storage.

In addition, described VSS is also for the registration process at described UE, after receiving the registration request that described S-CSCF sends, sends position updating request, to obtain the user data of described UE to HSS or the HLR of the home network 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 is used the user data of local storage to call out control to this calling while receiving this user's final call request, and call out control without the S-CSCF by this user attaching network, improved service quality, avoided the in the situation that of IMS network partial deployment, user's home network cannot be routed to the final call request of visitor visited network (local IMS network) and the problem of the service fail that causes.

Accompanying drawing explanation

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 present invention IMS network;

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

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

The method flow diagram of Fig. 4 for adopting system architecture of the present invention to register;

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

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

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

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

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

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

Embodiment

Below in conjunction with drawings and Examples, describe the present invention.

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

201: subscriber equipment (User Equipment, referred to as UE);

202: local IMS application server (Localised IMS Application Server, referred to as LI AS);

203: visitor server (Visitor Subscriber Server, referred to as VSS);

204: CSCF (Call Session Control Function, referred to as CSCF);

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

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

In Fig. 2 and Fig. 2 a:

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

Local IMS application server (LI AS) is the newly-increased network element of the present invention, and this network element can be understood as a logical functional entity, can with other AS(application servers) close and establish.

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

When the user under roaming state (being called visitor) initiates registration, LI AS is for obtaining and preserve user data from VSS;

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

When receiving the final call request of visitor, LI AS points to the local roaming number corresponding with called number for distributing, or the roaming number distributing according to VSS obtains corresponding called number to VSS; And after receiving session invitation message, use called number to replace the roaming number in this message, 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, while separately disposing as shown in Figure 2 a, wherein:

TAS has been used for calling out control;

LAS is for distributing the roaming number that points to TAS, or the roaming number of the sensing TAS of use VSS distribution obtains corresponding called number from VSS.

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

Visitor server (VSS) is also the newly-increased network element of the present invention, the function of its realization is similar to HSS, difference is: VSS is for when receiving the registration request of visitor, the user data that obtains this user from HSS or the HLR of this visitor home network, store the user data getting, and the user data of its storage is provided to LI AS.

In addition, VSS also possesses following functions:

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

circuit domain service data is converted to IMS business datum;

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

receive that, after the request of Providing Roaming Number, VSS distributes the roaming number that points to LI AS, and preserves relation between roaming number and called number, the backward HSS/HLR of success returns to roaming number; Or, to LI AS, ask for roaming number, after asking for successfully, to HSS/HLR, return to roaming number;

receive that LI AS sends obtain 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, referred to as I-CSCF), Proxy Call Session Control Function (Proxy Call Session Control Function, referred to as P-CSCF) and service call conversation control function (Serving CSCF, referred to as S-CSCF).Wherein:

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

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

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

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

HLR can think the subset of HSS, for 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 different entities, now between HLR and HSS, there is interface, realize the mutual of information.

Fig. 3 is the Organization Chart three of the business realizing system of embodiment of the present invention IMS network, in this Organization Chart, comprised and adopted the operation system of IMS network of the present invention to register related network element, wherein show each network element in the access network part of abridged in Fig. 2 and Fig. 2 a: Mobility Management Entity (Mobility Management Entity, referred to as MME), gateway (Serving Gateway, referred to as S-GW), packet data network gateway (Packet Data Network Gateway, be called for short PDN GW or P-GW), Dynamic Host Configuration Protocol server (Dynamic Host Configuration Protocol Server, referred to as DHCP Server), and show abridged domain name system in Fig. 2 and Fig. 2 a (Domain Name System, referred to as DNS), and CSCF is further subdivided into P-CSCF, I-CSCF and S-CSCF, wherein:

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

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

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

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

Domain name system (DNS), for being translated as domain name corresponding IP address.

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

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

The method flow diagram of Fig. 4 for adopting system architecture of the present invention to register; In this flow process, when VSS receives after the login request message of S-CSCF forwarding, if there is no corresponding user data in VSS, to HSS/HLR launch position update request, to obtain user data; After user data obtains successfully, to S-CSCF, return to registration reply, in this response message, comprise LI AS trigger criteria (also referred to as initial filter standard or norm, be Initial Filter Criteria, referred to as iFC) and trigger address, by LI AS trigger criteria, trigger S-CSCF and carry out third-party registration; As shown in Figure 4, the method comprises the steps:

401, UE P-CSCF(to local IMS network under roaming state is the P-CSCF of visited network, referred to as local P-CSCF) send login request message, in this message, carry User Identity;

402, local P-CSCF receives after login request message, and the I-CSCF(that this message is transmitted to local IMS network is the I-CSCF of visited network, referred to as local I-CSCF);

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

403, local I-CSCF receives after login request message, to the VSS transmission query messages of local IMS network, to inquire about the address of S-CSCF;

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

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

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

407, receive after login request message, if there is no corresponding user data in VSS, the HSS/HLR to UE home network sends position updating request, to obtain user data;

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

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

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

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

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

409, VSS preserves the user data receiving, and returns to user data insert response message to HSS/HLR;

410, HSS/HLR receives that the user data that VSS sends inserts after response message, upgrades response message to VSS home position;

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

In above-mentioned LI AS trigger criteria, comprise: the trigger criteria of the events such as registered events, caller event, called event.Wherein, the trigger criteria of registered events is carried out third-party registration by triggering S-CSCF.

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

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

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

416, LI AS receives after third-party registration request, according to the VSS address of the VSS address of wherein carrying or local configuration, to VSS, sends and obtains subscriber data message, to obtain user data, in this message, carries user ID;

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

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

418, LI AS preserves after user data, and LI AS returns and registered message to local S-CSCF;

If comprise non-switched circuit domain service data in user data, LI AS need to 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 LI AS in Fig. 4 refers in particular to TAS when LI AS is comprised of TAS and two network elements of LAS.

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

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

As shown in Figure 5 a, the method specifically comprises following steps:

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

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

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

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

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

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

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

As shown in Figure 5 b, the method specifically comprises following steps:

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

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

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

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

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

Fig. 5 c accesses local IMS network, while initiating registration by local IMS network, by UE, selects method (making local P-CSCF in step 402 login request message receiving is transmitted to the method for the local I-CSCF) flow chart of local IMS network as UE.In this flow process, when UE obtains after the full name of P-CSCF, according to the full name of P-CSCF, home domain name is set.Before flow process shown in Fig. 5 c occurs in step 401, specifically comprise following steps:

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

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

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

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

5c05, UE receive after the full name of P-CSCF, if wish to use local IMS business, according to the full name of P-CSCF, home domain name (be about to the character string after "@" character in the full name of P-CSCF and be set to home domain name) are set; After this, in the login request message of UE in step 401, this home domain name is included in login request message and is registered, in step 402, local P-CSCF is transmitted to local I-CSCF according to the home domain name in login request message by this message.

Fig. 5 d is that VSS receives the method flow diagram that obtains the IMSI of respective user after 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 login request message, and as shown in Fig. 5 d, the method comprises the steps:

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

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

Mode one: comprise following sub-step:

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

Mode two: comprise following sub-step:

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

B2:UE receives after refusal registration message, according to the above-mentioned information comprising in this message, uses IMSI or uses the interim private user identity of being derived by IMSI again to initiate registration;

B3: receive after the registration request that UE resends, VSS obtains IMSI or obtains interim private user identity and it is carried out oppositely deriving obtain corresponding IMSI from this request from this request; Or

Mode three: comprise following sub-step:

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

C2:UE receives after sip subscribe or SIP query messages, to VSS, returns to user IMSI; Or

Mode four: comprise following sub-step:

The IMS private user identity carrying in d1:VSS use registration request obtains corresponding IMSI to the HSS of UE home network;

D2:HSS returns to 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 present invention IMS network, in this Organization Chart, comprise network element related while adopting the business realizing system of IMS network of the present invention to call out, wherein shown each network element in the access network part of abridged in Fig. 2 and Fig. 2 a: Mobility Management Entity (MME), gateway (S-GW), packet data network gateway (P-GW); CSCF is further subdivided into P-CSCF and S-CSCF; And increased abridged IMS network element in Fig. 2 and Fig. 2 a: MGCF (Media Gateway Control Function, referred to as MGCF); In addition, in this Organization Chart, also show the network element that the CS network in Fig. 2 and Fig. 2 a comprises: media gateway (Media Gateway, referred to as MGW), gateway MSC (Gateway Mobile Switching Center, referred to as GMSC), public switch telephone network (Public Switched Telephone Network, referred to as PSTN); Wherein:

MGCF (MGCF), for carrying out, media are controlled and signaling protocol conversion;

Media gateway (MGW), for providing media bearer;

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

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

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

Fig. 7 is for adopting system architecture of the present invention to work the method flow diagram of exhaling; Exhale in process rising, to call out the TAS controlling in LI AS and complete, specifically to comprise the steps:

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

702, local P-CSCF forwards session invitation message according to the routing iinformation recording in this UE registration process to local S-CSCF;

703, receive after session invitation message, 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 in iFC, and call out control by LI AS), session invitation message is routed to LI AS;

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

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

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

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 in iFC by the ALERTING message receiving, and LI AS sends to UE by this ALERTING message by local S-CSCF after completing and calling out control again.

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

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 in iFC by the response message receiving, and LI AS sends to UE by this response message by local S-CSCF after completing and calling out control again.

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

Fig. 8 is for adopting system architecture of the present invention to carry out the method flow diagram of exhaling eventually; Exhaling in process eventually, receiving that, after the request of Providing Roaming Number of HSS/HLR transmission, VSS distributes a roaming number that points to LAS according to this locality configuration, or distribute roaming number request to LAS transmission, by LAS, according to the configuration of oneself, distributing roaming number; VSS sends to GMSC by roaming number by HSS/HLR, and GMSC is used the roaming number that points to LAS to complete 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 Fig. 8 comprises the steps:

801, PSTN calls out the UE(called subscriber who has roamed into local IMS system) time, PSTN sends 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, the GMSC of user attaching network receives after initial address message, to the HSS/HLR transmission route requests 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) being sent by VSS in called subscriber (UE) registration process called subscriber's current roaming is in the local IMS network of VSS administration, therefore to VSS, send the request of Providing Roaming Number, wherein comprise called number;

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

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 the roaming number that points to LAS, and HSS/HLR is returned to GMSC;

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

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

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

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

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

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

815～816, after calling has been controlled, TAS sends 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 after ALERTING message, MGCF sends address by GMSC to the PSTN at calling subscriber place and completes message (ACM);

820, after called subscriber answers, UE sends 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) in roaming state, by Proxy Call Session Control Function P-CSCF and the service call conversation control function S-CSCF of local IP Multimedia System IMS network, when the visitor server VSS of local IMS network registration request, the user data that obtains this user from home subscriber server HSS or the attaching position register HLR of this visitor home network, the user data that storage gets, and to local IMS application server LIAS, provide the user data of its storage, the method comprises:

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

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

Before returning to described roaming number after the request of Providing Roaming Number described in described VSS receives, to the home network of described UE, the method comprises: described VSS sends and distributes roaming number request to described LAS, carries the number of described UE in this request; Receive after 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,

Before returning to described roaming number after the request of Providing Roaming Number described in described VSS receives, to the home network of described UE, the 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 by described iFC in the following way:

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

In described iFC, comprise registered events trigger criteria;

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. a business realizing system for IP Multimedia System network, this system provides business as visited network for the user equipment (UE) in roaming state; This system comprises: Proxy Call Session Control Function P-CSCF, service call conversation control function S-CSCF, visitor server VSS, MGCF MGCF, location server LAS and telecommunication service application server TAS; When the user equipment (UE) in roaming state, by Proxy Call Session Control Function P-CSCF and the service call conversation control function S-CSCF of local IP Multimedia System IMS network, when the visitor server VSS of local IMS network registration request, the user data that obtains this user from home subscriber server HSS or the attaching position register HLR of this visitor home network, store the user data getting, and the user data of its storage is provided to local IMS application server LI AS; Wherein:

Described S-CSCF is for sending to described TAS to call out control described session invitation message according to the called event trigger standard of initial filter standard or norm iFC;

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

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

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

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

Described VSS also, for return to described roaming number after the request of Providing Roaming Number described in receiving, to the home network of described UE before, distributes described roaming number, and preserves the number of described UE and the corresponding relation of described roaming number;

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

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

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

Described S-CSCF, also 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 in described iFC to described TAS;

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

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