CN101931923B - Method for user registration of IP multimedia subsystem network and service fulfillment system - Google Patents

Abstract

The invention relates to a method for user registration of an IP multimedia subsystem network. After UE sends a registration request to P-CSCF of a local IMS network in a roaming state, the method comprises the following steps that: the P-CSCF forwards the registration request to S-CSCF of the local IMS network through I-CSCF of the local IMS network, and the S-CSCF forwards the registration request to E-MSC of the local IMS network; after receiving the registration request, the E-MSC sends a position update request to HLR or HSS of a UE home network if user data of the UE does not exist in the E-MSC; the HLR or HSS returns the user data of the UE to the E-MSC after receiving the position update request; and the E-MSC stores the user data, identifies the UE as registered UE and returns a registration response message to the S-CSCF; and the S-CSCF completes subsequent registration processes.

Description

The user registering method of IP Multimedia System network and business realizing system

Technical field

The present invention relates to the communications field, relate in particular to user registering method and the business realizing 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, 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 that the PS Core (being called for short EPC) that makes evolution can provide higher transmission rate, 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, and the business realizing system of a kind of user registering method and IMS network is provided, and to realize visitor, at local IMS network, registers.

In order to address the above problem, the invention provides a kind of user registering method of IP Multimedia System network, when user equipment (UE), the Proxy Call Session Control Function P-CSCF to local IP Multimedia System IMS network under roaming state sends after registration request, and the method comprises:

Described P-CSCF is transmitted to described registration request the service call conversation control function S-CSCF of local IMS network by the query call conversation control function I-CSCF of local IMS network, be transmitted to the E-MSC of enhancing mobile switching centre of local IMS network by described S-CSCF;

Receive after described registration request, if there is no the user data of described UE in E-MSC, attaching position register HLR or the home subscriber server HSS to described UE home network sends position updating request; Receive after described position updating request, described HLR or HSS return to E-MSC by the user data of described UE; E-MSC preserves described user data, described UE is designated registered, and returns to registration reply message to described S-CSCF, by described S-CSCF, completes follow-up register flow path.

In addition, receive after described registration request, if there is the user data of described UE in E-MSC, E-MSC is designated described UE registered, and returns to registration reply message to described S-CSCF, by described S-CSCF, completes follow-up register flow path.

In addition, described P-CSCF carries out described forwarding by the described registration request receiving by described I-CSCF according to carrier policy;

Described carrier policy is: the registration request that all UE are sent all carries out described forwarding by the I-CSCF of described local IMS network, or the I-CSCF of the registration request only UE that does not sign IMS interconnection agreement being sent by described local IMS network carries out described forwarding.

In addition, described P-CSCF receives after described registration request, be transmitted to described I-CSCF before, the method also comprises:

Described P-CSCF is used the home domain name of carrying in described registration request to send I-CSCF address lookup message to domain name system DNS, to inquire about I-CSCF address;

Receive after described I-CSCF address lookup message, DNS extracts the home domain name in this message, and described home domain name is translated into the address of the I-CSCF of local IMS network according to carrier policy, and I-CSCF address is returned to described P-CSCF;

The I-CSCF address that described P-CSCF is used DNS to return sends to described registration request the I-CSCF of described local IMS network;

Described carrier policy is: the address that all home domain name that receive are all translated into the address of the I-CSCF in described local IMS network or only the home domain name of not signing the network of IMS interconnection agreement translated into the I-CSCF in described local IMS network.

In addition, described UE sends before described registration request, and the method also comprises:

Described UE sends and obtains the full name of P-CSCF message to packet data network gateway P-GW, and P-GW returns to described UE by the full name of the P-CSCF getting from DHCP Dynamic Host Configuration Protocol server;

Described UE arranges home domain name according to the full name of described P-CSCF, and described home domain name is included in and in described registration request, sends to described P-CSCF;

Described P-CSCF sends to described registration request according to the home domain name in described login request message the I-CSCF of described local IMS network.

In addition, receive after described registration request, if there is no the user ID of carrying in the user data of described UE and described registration request in E-MSC is not international mobile subscriber identity IMSI, E-MSC obtains one of in the following way the IMSI of described UE, and uses the IMSI obtaining to send described position updating request:

If the user ID of carrying in described registration request is the interim private user identity that uses IMSI to derive, E-MSC oppositely derives to interim private user identity, obtains IMSI; Or

If the user ID of carrying in described registration request is IMS private user identity, E-MSC sends refusal registration message to described UE, by this message, is indicated described UE to use IMSI or is used the interim private user identity of being derived by IMSI again to initiate registration; And after receiving the registration request that described UE resends, from this request, obtain IMSI or from this request, obtain interim private user identity and it is carried out oppositely deriving obtain IMSI; Or

E-MSC sends initial session protocol sip subscribe or SIP query messages to obtain IMSI to described UE; Or

E-MSC is used the IMS private user identity carrying in described registration request to obtain IMSI to described HSS.

In addition, in described registration reply message, comprise initial filter standard or norm iFC;

In described iFC, comprise: trigger described S-CSCF and initiate the registered events trigger criteria of third-party registration and/or trigger described S-CSCF and initiate the caller event trigger standard of third party call control and/or trigger described S-CSCF and initiate to E-MSC the called event trigger standard that third party call is controlled to E-MSC to E-MSC.

In addition, in described iFC, comprise and trigger described S-CSCF to the registered events trigger criteria of E-MSC initiation third-party registration;

Described S-CSCF receives after described registration reply message, to E-MSC, sends third-party registration request, carries user ID and the current access address of described UE of described UE in this request;

Receive after described third-party registration request, E-MSC preserves user ID and the current access address of described UE 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, and is connected with HLR or the HSS of described UE home network; This system comprises: P-CSCF, I-CSCF, S-CSCF and E-MSC; Wherein:

After the registration request that described P-CSCF sends for the UE receiving in roaming state, described registration request is transmitted to described S-CSCF by described I-CSCF, by described S-CSCF, is transmitted to described E-MSC;

Described E-MSC is for after receiving described registration request, and whether judgement this locality stores the user data of described UE:

If described E-MSC does not store this locality the user data of described UE, to described HER or HSS, send position updating request to obtain the user data of described UE; Receive after the user data that described HER or HSS return, preserve described user data, described UE is designated registered, and return to registration reply message to described S-CSCF, by described S-CSCF, complete follow-up register flow path;

If described E-MSC this locality stores the user data of described UE, described UE is designated registeredly, and return to registration reply message to described S-CSCF, by described S-CSCF, complete follow-up register flow path.

In addition, described P-CSCF carries out described forwarding by the described registration request receiving by described I-CSCF according to carrier policy;

Described carrier policy is: the registration request that all UE are sent all carries out described forwarding by the I-CSCF of described local IMS network, or the I-CSCF of the registration request only UE that does not sign IMS interconnection agreement being sent by described local IMS network carries out described forwarding.

In addition, in described system, also comprise DNS;

Described P-CSCF after receiving described registration request, be transmitted to described I-CSCF before, also use the home domain name of carrying in described registration request to send I-CSCF address lookup message to described DNS, to inquire about I-CSCF address;

Described DNS is for after receiving described I-CSCF address lookup message, extract the home domain name in this message, and according to carrier policy, the described home domain name receiving is translated into the address of described I-CSCF, and I-CSCF address is returned to described P-CSCF;

Described P-CSCF is used the I-CSCF address that described DNS returns that described registration request is sent to described I-CSCF;

Described carrier policy is: the address that all home domain name that receive are all translated into the address of the I-CSCF in described system or only the home domain name of not signing the network of IMS interconnection agreement translated into the I-CSCF in described system.

In addition, receive after described registration request, if there is no the user ID of carrying in the user data of described UE and described registration request in described E-MSC is not IMSI, described E-MSC is also for obtaining one of in the following way the IMSI of described UE, and uses the IMSI obtaining to send described position updating request:

If the user ID of carrying in described registration request is the interim private user identity that uses IMSI to derive, described E-MSC oppositely derives to this interim private user identity, obtains IMSI; Or

If the user ID of carrying in described registration request is IMS private user identity, described E-MSC sends refusal registration message to described UE, by this message, is indicated described UE to use IMSI or is used the interim private user identity of being derived by IMSI again to initiate registration; And after receiving the registration request that described UE resends, from this request, obtain IMSI or from this request, obtain interim private user identity and it is carried out oppositely deriving obtain IMSI; Or

Described E-MSC sends initial session protocol sip subscribe or SIP query messages to obtain IMSI to described UE; Or

Described E-MSC is used the IMS private user identity carrying in described registration request to obtain IMSI to described HSS.

In addition, described S-CSCF is also for after receiving described registration reply message, according to the iFC comprising in described registration reply message, to described E-MSC, send third-party registration request, in this request, carry user ID and the current access address of described UE of described UE;

Described E-MSC, also for after receiving described third-party registration request, preserves user ID and the current access address of described UE of described UE.

In sum, the present invention strengthens mobile switching centre (E-MSC) by arranging in local IMS network, by E-MSC HSS/HLR to user attaching network in the registration process of visitor, send position updating request to obtain the user data of visitor, realize this locality storage of the user data of visitor, and then realized this locality registration of visitor.

Adopt IMS network localization provided by the invention to dispose framework, and adopt EPS network insertion to realize the system and method for CS business, solve the roaming problem of former IMS network partial deployment, adopt the IMS of standard to access terminal simultaneously, reduce the user's overlapping investment because of network evolution process.

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. 3 is the Organization Chart two 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. 4 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. 4 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. 4 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. 4 d is that E-MSC receives the method flow diagram that obtains the IMSI of respective user after login request message;

Fig. 5 is the Organization Chart three of the business realizing system of embodiment of the present invention IMS network;

Fig. 6 is for adopting system architecture of the present invention to work the method flow diagram of exhaling;

Fig. 7 is for adopting system architecture of the present invention to carry out the method flow diagram of exhaling eventually.

Embodiment

Core concept of the present invention is, in local IMS network, arrange and strengthen mobile switching centre (E-MSC), when the user under roaming state (being called visitor) initiates registration by P-CSCF, by E-MSC HSS/HLR to user attaching network in the registration process of visitor, send the user data that position updating request is obtained visitor, to realize this locality storage of the user data of visitor, and then realize this locality registration of visitor.

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); Possess IMS ability, support Session Initiation Protocol, for be linked into the P-CSCF of IMS network by access device, register, and set up session connection with far-end;

202: strengthen (the Enhanced Mobile Switch Center of mobile switching centre, referred to as E-MSC) server, for the newly-increased network element of the present invention, E-MSC server (referred to as E-MSC) is a physical entity, possess circuit switching (exchange of media) ability and signaling protocol transfer capability, and can realize this locality registration of visitor, support ISC interface and the Cx interface of standard.

For local IMS network, E-MSC has realized the function of HSS and AS (application server); From the angle of CS network, E-MSC has realized the function of MSC.

Specifically, E-MSC possesses following function:

possess protocol conversion function, can be to mutually changing between SIP signaling and circuit domain related protocol signaling, can convert the SIP signaling of receiving from ISC interface and Cx interface to corresponding circuit domain signaling;

possess mobile switch ability (being signaling and exchange of media ability), can between IP carrying and circuit domain carrying, carry out exchange of media;

when what E-MSC received that remote subscriber initiates, enter to call for while asking (being final call request), can, as user agent, to roaming in local IMS terminal initiation session, invite request;

possess local registration ability, when receiving the query messages that I-CSCF sends, can distribute local S-CSCF for visitor; When receiving the registration request of visitor, can obtain corresponding IMSI (International Mobile SubscriberIdentifier, international mobile subscriber identity) according to the IMS private user identity carrying in registration request; If this locality does not have user data, can obtain user data to the HSS/HLR of user attaching network;

can generate the trigger criteria (also referred to as initial filter standard or norm, i.e. Initial FilterCriteria, referred to as iFC) of E-MSC and trigger address (being the address of E-MSC);

while receiving the request that Provides Roaming Number of HSS/HLR transmission, E-MSC can distribute the local roaming number of sensing;

for example, while receiving setup requests (, session invitation message, initial address message), possess for this call setup carrying and carry out media and the ability of signaling exchange.

203: CSCF (Call Session Control Function, referred to 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:

P-CSCF is used for carrying out the route of message, and sets up Security Association with terminal; In addition, P-CSCF, after receiving the registration request of visitor, can route the request to the I-CSCF of local IMS network;

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

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

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

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

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 physical entities, now between HLR and HSS, there is interface, realize the mutual of information.

Fig. 3 is the Organization Chart two 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 abridged access network part in Fig. 2: Mobility Management Entity (MobilityManagement Entity, referred to as MME), gateway (Serving Gateway, referred to as S-GW), packet data network gateway (Packet DataNetwork Gateway, be called for short PDN GW or P-GW), Dynamic Host Configuration Protocol server (Dynamic Host Configuration ProtocolServer, referred to as DHCP Server), and show abridged domain name system in Fig. 2 (DomainName System, referred to as DNS), in addition 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 the gateway of UE access PDN (Packet Data Network, Packet Data Network).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 E-MSC receives after the login request message of S-CSCF forwarding, if there is no corresponding user data in E-MSC, to HSS/HLR launch position update request, to obtain user data; User data returns to registration reply to S-CSCF after obtaining successfully, comprises the trigger criteria that E-MSC generates (also referred to as initial filter standard or norm, i.e. Initial Filter Criteria, referred to as iFC) and triggering address in this response message; As shown in Figure 4, the method comprises the steps:

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

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

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. 4 a～4c that can vide infra.

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

404, E-MSC assigns the address of the S-CSCF (referred to as local S-CSCF) of a local IMS network, and is 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 E-MSC, sends login request message;

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

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

In above-mentioned 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, E-MSC needs user's IMSI (International Mobile SubscriberIdentifier, international mobile subscriber identity) obtain user data, if the user ID in login request message is not IMSI, E-MSC can adopt several different methods to obtain user's IMSI, the concrete grammar description part to Fig. 4 d that can vide infra.

408, HSS/HLR sends and inserts user data requests to E-MSC, 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, E-MSC 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 E-MSC sends inserts after response message, upgrades response message to E-MSC home position;

411, E-MSC receives that, after position update response information, identifying user is registered, and returns to registration reply message to local S-CSCF, carries trigger criteria (being iFC) and triggering address (being the address of E-MSC) that E-MSC generates in this message;

In above-mentioned 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, S-CSCF sends third-party registration request, the user ID of carrying UE in this request, and the current access address of UE according to the registered events trigger criteria in iFC to E-MSC;

416, E-MSC receives after third-party registration request, preserves user ID and the current third party's log-on messages such as access address of UE of UE, and returns and registered message to local S-CSCF.

It should be noted that step 415～416 are for optional step; E-MSC preserves the current access address of UE so that at the follow-up business continuance of realizing; The concrete grammar of realizing business continuance has exceeded category of the present invention.

Fig. 4 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 the E-MSC of local IMS network to register.

As shown in Fig. 4 a, the method specifically comprises following steps:

4a01 (being step 401), UE send login request message to local P-CSCF, carry home domain name and User Identity in this message;

4a02, 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.

4a03, when judging that while need to select local I-CSCF (selecting local IMS network to carry out this locality registration), P-CSCF is to local I-CSCF forwarding login request message.

Fig. 4 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 4 b, the method specifically comprises following steps:

4b01 (being step 401), UE send login request message to local P-CSCF, carry home domain name and User Identity in this message;

4b02, 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;

4b03, 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;

4b04, DNS return to P-CSCF by I-CSCF address.

Fig. 4 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 occurs in step 401 shown in Fig. 4 c, specifically comprise following steps:

4c01, UE send and obtain the full name of P-CSCF message to P-GW;

4c02, P-GW are from the full name of Dynamic Host Configuration Protocol server acquisition request P-CSCF;

4c03, Dynamic Host Configuration Protocol server return to the full name of P-CSCF to P-GW;

4c04, P-GW return to the full name of P-CSCF to UE;

4c05, 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. 4 d is that E-MSC 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 E-MSC receives the method for obtaining the IMSI of respective user after login request message, and as shown in Fig. 4 d, the method comprises the steps:

4d01, receive after login request message, E-MSC extracts the user ID in this message, and judges whether user ID is IMSI, if not, perform step 4d02, otherwise this flow process finishes;

If 4d02 user ID is not IMSI, E-MSC 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, E-MSC 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, E-MSC 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, E-MSC 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:E-MSC to UE send that SIP (Session Initial Protocol, initial session protocol) subscribes to or SIP query messages to obtain the IMSI of UE;

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

Mode four: comprise following sub-step:

The IMS private user identity carrying in d1:E-MSC 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 E-MSC.

Fig. 5 is the Organization Chart three 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 abridged access network part in Fig. 2: Mobility Management Entity (MME), gateway (S-GW), packet data network gateway (P-GW); And CSCF is further subdivided into P-CSCF and S-CSCF; In addition, in this Organization Chart, also show the network element that the CS network in Fig. 2 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:

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. 5 also will be described in more detail below.

Fig. 6 is for adopting system architecture of the present invention to work the method flow diagram of exhaling; Exhale in process rising, local S-CSCF is routed to E-MSC by the caller event trigger standard triggering in iFC by session invitation message, and E-MSC carries out signaling protocol conversion, and IMS signaling is converted to CS signaling, establishes call connection with far-end; Shown in Fig. 6, flow process specifically comprises the steps:

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

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

603, 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 E-MSC), session invitation message is routed to E-MSC;

604, E-MSC 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 sends 200OK message (not shown) to UE after having controlled, to set up the media bearer (IP carrying) between UE and E-MSC; Then the PSTN transmission initial address message (IAM) to called subscriber place according to called number, carries calling number and called number in this message.

605,, during called user terminal ring, PSTN completes message (ACM) to E-MSC return address;

Pass through the mutual of step 604 and 605, set up the media bearer (CS carrying) between E-MSC and the PSTN at called subscriber place.

606～608, E-MSC completes by the address of circuit domain the ALERTING message that message (ACM) converts SIP to, and ALERTING message is transmitted to call subscriber terminal (UE) by local S-CSCF and local P-CSCF;

609, after the called subscriber's call establishment in PSTN, to the response message (ANM) in E-MSC transtation mission circuit territory;

610～612, receive after the response message (ANM) of circuit domain, E-MSC connects the media bearer between itself and call subscriber terminal (UE) and far-end PSTN, and to call subscriber terminal (UE), sending response message (200OK message) by local S-CSCF and local P-CSCF, subscriber call is answered.

Fig. 7 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 exhale after the request of setting up (initial address message) end of circuit domain, E-MSC, as user agent, initiates SIP session establishment request (session invitation message) to called subscriber (UE), completes call establishment; Method shown in Fig. 7 comprises the steps:

701, PSTN calls out while having roamed into the UE (called subscriber) of local IMS system, 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;

702, the GMSC of called subscriber's home 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;

703, HSS/HLR knows that according to the position updating request (step 407) being sent by E-MSC in called subscriber (UE) registration process called subscriber's current roaming is in the local IMS network of E-MSC administration, therefore to E-MSC, send the request of Providing Roaming Number, wherein comprise called number;

704～705, receive after the request of Providing Roaming Number, E-MSC distributes one to point to local roaming number, preserves the corresponding relation of roaming number and called number; And by response message, roaming number being returned to the HSS/HLR of called subscriber's home network, the HSS/HLR of called subscriber's home network returns to GMSC by roaming number again;

706, GMSC sends initial address message (IAM) according to roaming number to E-MSC, to route the call to E-MSC, carries above-mentioned roaming number (as called number) and dialing number information in this message;

707, receive after initial address message (IAM), E-MSC judges that the called number in this message is the roaming number that this network element distributes, the called number of preserving before therefore finding according to this roaming number; E-MSC to calling out control, calls out the roaming number of having controlled in this called number of rear use (being the number of UE) replacement initial address message according to the user data obtaining in called number and this UE registration process; And to called subscriber (UE), send session invitation message by S-CSCF, to set up calling, and set up the media bearer (IP carrying) between E-MSC and called user terminal (UE); In above-mentioned session invitation message, carry called number (being the number of UE) and calling number;

708, S-CSCF, according to IP address and the routed path of user's registration, forwards session invitation message by P-CSCF to called user terminal (UE);

709～710,, after called user terminal (UE) ring, UE sends SIP ALERTING message by P-CSCF and S-CSCF to E-MSC;

711～712, E-MSC receives after ALERTING message, and the address that is converted into circuit domain completes message (ACM), and it is sent to the PSTN at calling subscriber place by GMSC;

So far, E-MSC has set up the media bearer (CS carrying) between the PSTN at itself and calling subscriber place.

713～714,, after called subscriber's call establishment, UE sends SIP by P-CSCF and S-CSCF to E-MSC and connects message;

715～716, E-MSC receives that SIP connects after message, connect the media bearer between E-MSC itself and called user terminal (UE) and PSTN, and SIP is connected to the response message (ANM) that message conversion becomes circuit domain, by GMSC, send to the PSTN at calling subscriber place.

Claims (13)

1. the user registering method of an IP Multimedia System network, it is characterized in that, the go-between being applied between the IP Multimedia System IMS network of ownership place and the IMS network of visited place is not disposed IMS network condition, when user equipment (UE), the Proxy Call Session Control Function P-CSCF to local IP Multimedia System IMS network under roaming state sends after registration request, and the method comprises:

Described P-CSCF is transmitted to described registration request the service call conversation control function S-CSCF of local IMS network by the query call conversation control function I-CSCF of local IMS network, be transmitted to the E-MSC of enhancing mobile switching centre of local IMS network by described S-CSCF; Described E-MSC has the function of home subscriber server HSS and application server AS;

Receive after described registration request, if there is no the user data of described UE in E-MSC, attaching position register HLR or the home subscriber server HSS to described UE home network sends position updating request; Receive after described position updating request, described HLR or HSS return to E-MSC by the user data of described UE; E-MSC preserves described user data, described UE is designated registered, and returns to registration reply message to described S-CSCF, by described S-CSCF, completes follow-up register flow path.

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

Receive after described registration request, if there is the user data of described UE in E-MSC, E-MSC is designated described UE registered, and returns to registration reply message to described S-CSCF, by described S-CSCF, completes follow-up register flow path.

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

Described P-CSCF carries out described forwarding by the described registration request receiving by described I-CSCF according to carrier policy;

Described carrier policy is: the registration request that all UE are sent all carries out described forwarding by the I-CSCF of described local IMS network, or the I-CSCF of the registration request only UE that does not sign IMS interconnection agreement being sent by described local IMS network carries out described forwarding.

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

Described P-CSCF receives after described registration request, be transmitted to described I-CSCF before, the method also comprises:

Described P-CSCF is used the home domain name of carrying in described registration request to send I-CSCF address lookup message to domain name system DNS, to inquire about I-CSCF address;

Receive after described I-CSCF address lookup message, DNS extracts the home domain name in this message, and described home domain name is translated into the address of the I-CSCF of local IMS network according to carrier policy, and I-CSCF address is returned to described P-CSCF;

The I-CSCF address that described P-CSCF is used DNS to return sends to described registration request the I-CSCF of described local IMS network;

Described carrier policy is: the address that all home domain name that receive are all translated into the address of the I-CSCF in described local IMS network or only the home domain name of not signing the network of IMS interconnection agreement translated into the I-CSCF in described local IMS network.

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

Described UE sends before described registration request, and the method also comprises:

Described UE sends and obtains the full name of P-CSCF message to packet data network gateway P-GW, and P-GW returns to described UE by the full name of the P-CSCF getting from DHCP Dynamic Host Configuration Protocol server;

Described UE arranges home domain name according to the full name of described P-CSCF, and described home domain name is included in and in described registration request, sends to described P-CSCF;

Described P-CSCF sends to described registration request according to the home domain name in described login request message the I-CSCF of described local IMS network.

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

Receive after described registration request, if there is no the user ID of carrying in the user data of described UE and described registration request in E-MSC is not international mobile subscriber identity IMSI, E-MSC obtains one of in the following way the IMSI of described UE, and uses the IMSI obtaining to send described position updating request:

If the user ID of carrying in described registration request is the interim private user identity that uses IMSI to derive, E-MSC oppositely derives to interim private user identity, obtains IMSI; Or

If the user ID of carrying in described registration request is IMS private user identity, E-MSC sends refusal registration message to described UE, by this message, is indicated described UE to use IMSI or is used the interim private user identity of being derived by IMSI again to initiate registration; And after receiving the registration request that described UE resends, from this request, obtain IMSI or from this request, obtain interim private user identity and it is carried out oppositely deriving obtain IMSI; Or

E-MSC sends initial session protocol sip subscribe or SIP query messages to obtain IMSI to described UE; Or

E-MSC is used the IMS private user identity carrying in described registration request to obtain IMSI to described HSS.

7. method as claimed in claim 1 or 2, is characterized in that,

In described registration reply message, comprise initial filter standard or norm iFC;

In described iFC, comprise: trigger described S-CSCF and initiate the registered events trigger criteria of third-party registration and/or trigger described S-CSCF and initiate the caller event trigger standard of third party call control and/or trigger described S-CSCF and initiate to E-MSC the called event trigger standard that third party call is controlled to E-MSC to E-MSC.

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

In described iFC, comprise and trigger described S-CSCF to the registered events trigger criteria of E-MSC initiation third-party registration;

Described S-CSCF receives after described registration reply message, to E-MSC, sends third-party registration request, carries user ID and the current access address of described UE of described UE in this request;

Receive after described third-party registration request, E-MSC preserves user ID and the current access address of described UE of described UE.

9. the business realizing system of an IP Multimedia System network, the go-between being applied between the IP Multimedia System IMS network of ownership place and the IMS network of visited place is not disposed IMS network condition, this system provides business as visited network for the UE in roaming state, and is connected with HLR or the HSS of described UE home network; This system comprises: P-CSCF, I-CSCF, S-CSCF and E-MSC; Described E-MSC has the function of home subscriber server HSS and application server AS; Wherein:

After the registration request that described P-CSCF sends for the UE receiving in roaming state, described registration request is transmitted to described S-CSCF by described I-CSCF, by described S-CSCF, is transmitted to described E-MSC;

Described E-MSC is for after receiving described registration request, and whether judgement this locality stores the user data of described UE:

If described E-MSC does not store this locality the user data of described UE, to described HLR or HSS, send position updating request to obtain the user data of described UE; Receive after the user data that described HLR or HSS return, preserve described user data, described UE is designated registered, and return to registration reply message to described S-CSCF, by described S-CSCF, complete follow-up register flow path;

If described E-MSC this locality stores the user data of described UE, described UE is designated registeredly, and return to registration reply message to described S-CSCF, by described S-CSCF, complete follow-up register flow path.

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

Described P-CSCF carries out described forwarding by the described registration request receiving by described I-CSCF according to carrier policy;

Described carrier policy is: the registration request that all UE are sent all carries out described forwarding by the I-CSCF of described local IMS network, or the I-CSCF of the registration request only UE that does not sign IMS interconnection agreement being sent by described local IMS network carries out described forwarding.

11. systems as claimed in claim 9, is characterized in that,

In described system, also comprise DNS;

Described P-CSCF after receiving described registration request, be transmitted to described I-CSCF before, also use the home domain name of carrying in described registration request to send I-CSCF address lookup message to described DNS, to inquire about I-CSCF address;

Described DNS is for after receiving described I-CSCF address lookup message, extract the home domain name in this message, and according to carrier policy, the described home domain name receiving is translated into the address of described I-CSCF, and I-CSCF address is returned to described P-CSCF;

Described P-CSCF is used the I-CSCF address that described DNS returns that described registration request is sent to described I-CSCF;

Described carrier policy is: the address that all home domain name that receive are all translated into the address of the I-CSCF in described system or only the home domain name of not signing the network of IMS interconnection agreement translated into the I-CSCF in described system.

12. systems as claimed in claim 9, is characterized in that,

Receive after described registration request, if there is no the user ID of carrying in the user data of described UE and described registration request in described E-MSC is not IMSI, described E-MSC is also for obtaining one of in the following way the IMSI of described UE, and uses the IMSI obtaining to send described position updating request:

If the user ID of carrying in described registration request is the interim private user identity that uses IMSI to derive, described E-MSC oppositely derives to this interim private user identity, obtains IMSI; Or

If the user ID of carrying in described registration request is IMS private user identity, described E-MSC sends refusal registration message to described UE, by this message, is indicated described UE to use IMSI or is used the interim private user identity of being derived by IMSI again to initiate registration; And after receiving the registration request that described UE resends, from this request, obtain IMSI or from this request, obtain interim private user identity and it is carried out oppositely deriving obtain IMSI; Or

Described E-MSC sends initial session protocol sip subscribe or SIP query messages to obtain IMSI to described UE; Or

Described E-MSC is used the IMS private user identity carrying in described registration request to obtain IMSI to described HSS.

13. systems as claimed in claim 9, is characterized in that,

Described S-CSCF, also for after receiving described registration reply message, sends third-party registration request according to the iFC comprising in described registration reply message to described E-MSC, carries user ID and the current access address of described UE of described UE in this request;

Described E-MSC, also for after receiving described third-party registration request, preserves user ID and the current access address of described UE of described UE.