CN101448245B

CN101448245B - Method for home network IMS domain to obtain UE access information

Info

Publication number: CN101448245B
Application number: CN200810089141XA
Authority: CN
Inventors: 李志军; 郝振武
Original assignee: ZTE Corp
Current assignee: ZTE Corp
Priority date: 2008-04-01
Filing date: 2008-04-01
Publication date: 2011-04-20
Anticipated expiration: 2028-04-01
Also published as: CN101448245A

Abstract

The invention provides a method for a home network IMS domain to obtain UE access information. The method comprises the steps as follows: access information about that UE is accessed to a visitor network is stored in HSS in advance; the HSS receives a request message of access-request information of S-CSCF from the home network IMS domain; and the HSS feeds back a response message to the S-CSCF, wherein, access information is carried. The invention ensures that the home network IMS domain can obtain the access information of UE, thereby being capable of selecting a proper media route mode for UE roaming.

Description

The method that is used for home network IMS domain to obtain UE access information

Technical field

The present invention relates to the communications field, in particular to a kind of method that is used for home network IMS (IPMultimedia Subsystem, IP Multimedia System) domain to obtain UE (UserEquipment, subscriber equipment) access information.

Background technology

IMS is the core of New Generation of Communication network, its distinguishing feature is to have adopted Session initiation Protocol (Session Initiation Protocol, be called for short SIP) system, communication is irrelevant with access, can possess multiple media business controlled function and separate with bearing capacity, calls out and separates with session, application separates with service, business and network detach, and multiple abilities such as mobile network and internet service fusion, the trend of communication network fusion development has been complied with in the proposition of IMS.

Fig. 1 shows a kind of block diagram of IMS architecture of routine.Wherein:

The terminal equipment that subscriber equipment 101 representative of consumer are used;

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

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

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

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

Development along with network architecture flattening, and the appearance of the removable access way of multiple high-speed wideband also impels mobile communications network to propose LTE/SAE (Long term Evolution/System Architecture Evolution, Long Term Evolution/System Architecture Evolution) framework theory of future generation, comprise and make the wireless communication system of evolution that higher transmission rate can be provided, shorter transmission delay, lower cost, support the mobility between the inner connecting system of 3GPP (third generation partner program) simultaneously, and the mobility between 3GPP connecting system and the non-3GPP connecting system or the like.Simultaneously, LTE/SAE also will impel the IMS framework to be able to evolution and development as a kind of access means in IMS territory.

Fig. 2 is a kind of of the roaming scence that proposes of 3GPP, and UE is linked into the network architecture that the IMS business provides net by the SAE Access Network in this case, and wherein, the SAE access network is arranged in the visit territory, and the bottom access service is provided.The IMS service network is arranged in home domain.

In Fig. 2, the respective network elements of SAE network has:

E-UTRAN (Evolved UTRAN, the universal terrestrial access network of evolution): the wireless access network of evolution is follow-on wireless access network, and higher up-downgoing speed can be provided, lower transmission delay and reliable more wireless transmission.The main network entity of E-UTRN is eNodeB (base station of evolution).

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

SAE GW (SAE gateway): the user plane functions entity, the user face data route is handled, and is divided into Serving GW (gateway) and PDN GW (packet data gateway, P-GW) two kinds of SAE GW.Serving GW (be called for short S-GW) is mobile anchor point between SAE system and traditional 3GPP system and the mobile anchor point between the E-UTRAN.PDN GW: be Packet Data Network's entry gateway of (Packed Data Network is called for short PDN), its effect comprises that termination is in the downlink data of the UE of idle state; When the downlink data that mails to UE arrives, initiate paging; The context of management and storage UE is such as IP bearer service parameter and network internal routing iinformation etc.

Existing 2G/3G mobile network comprises:

Wireless GERAN (the GSM/EDGE Radio Access Network that comprises 2G, the GSM EDGE Radio Access Network network, GSM refers to global system for mobile communications, EGDG is for strengthening the GSM of data rate) and UTRAN (the Universal Terrestrial RadioAccess Network of 3G, universal terrestrial access network), core net comprises circuit domain (CS) network element MSC (Mobile Switch Center, mobile switching centre) and grouping domain network element service GPRS (GPRS) support node (Serving GPRS SupportNode, be called for short SGSN), wherein MSC provides the circuit voice business, circuit data service and short message service, SGSN links to each other with SAE GW among the LTE/SAE, and packet switch domain service is provided.

The IMS business network comprises:

The data in home subscriber server (Home Subscriber Server is called for short HSS) management CS territory, packet domain (PS) and IMS territory."Policy and Charging Rules Function (Policy andCharging Rules Function, be called for short PCRF) for controlling the function point of medium connection, medium flow, execution charging etc., a part that belongs to PCC (Policy and Charging Control, policy and charging control) function structure.S-CSCF, P-CSCF realize the control and the route of IMS signaling as the important node in the management of IMS signaling process.

UE can insert the IMS territory by LTE/SAE, also can insert the IMS network by the PS network (i.e. GERAN/UTRAN and SGSN part among the figure) of 2G and 3G, enjoys the business of IMS, can also insert the CS network of 2G and 3G simultaneously, enjoys CS business such as speech business.

Under the research background of SAE, travel back across the situation of home network at medium route under the present roaming condition, for the medium that reduce between the network make a circulation, save the network bandwidth, high-quality user experience is provided as far as possible, 3GPP organizes and has proposed to allow the medium route from the local method that directly produces, do not travel back across home network of visit net, can effectively avoid because the employing medium that mobile IP technology brought travel back across the triangle routing issue of home network.

Fig. 3 A has illustrated that the medium that adopt mobile IP technology to be applied under the roaming scence to be brought travel back across the triangle routing issue of home network.As shown in Figure 3A, because UE signaling aspect and medium aspect all adopt mobile IP technology, use the home network IP address allocated, and in fact UE is currently located at the visit net.Therefore according to the needs of route, all mail to the Media Stream of UE, all need to send to earlier home network, send to the Care-of Address of UE at the visit net by the tunnel on the IP gateway of home network, are transmitted to UE at the visit net then.Suo Shu IP gateway is responsible for UE distributing IP address in the drawings, the route of control Media Stream.

Travel back across the situation of home network at the medium of Fig. 3 A, the 3GPP tissue has proposed the improvement project shown in Fig. 3 B, in this scene, after UE adopts mobile IP technology to roam into the visit net, distribute visit net IP address a: IP-L by the visit net for it, and serve for it by a visit net IP gateway.This solution adopts signaling paths through home network, and media path is avoided the alternate route of medium directly from visiting the method that the net IP gateway produces.

The method of this solution medium alternate route shown in Fig. 3 B is referred to as by 3GPP.Be after UE roams into the visit net, the visit net is that UE has set up a visit ground IP carrying (promptly distributing visit ground IP gateway, IP address, visit ground), and utilizes this visit ground IP carrying that the direct route of medium is gone out, and does not travel back across home network.

Pattern (LBO pattern) is produced in this locality that is different from the medium route, and 3GPP via the mode that home network produces, is referred to as home network route pattern (Home Routed is called for short the HR pattern) with the medium route, and promptly the medium route is via the home network transfer.

At present, in the research at SAE, produce (Local Breakout is called for short LBO) pattern for this locality, frame of reference is as shown in Figure 4 arranged, in this framework, both pattern was produced in this locality of support media route, also the home network route pattern of support media route.

In Fig. 4, (the Packet Data Network of Packet Data Network that two responsible IP distribute, the medium route is controlled is arranged, abbreviation PDN) IAD (PDN Gateway, be called for short P-GW), one is PDN GW (the Home network PDN GW of home network, be called for short H-PGW), one is the PDN GW (Visited network PDNGateway is called for short V-PGW) of visit net.H-PGW and V-PGW close as the grouped data access network of home network and visit net respectively, and its essence is exactly the IP gateway function described in Fig. 3.Simultaneously, in the visit net, PCRF (the Visited network PCRF that has a visit net, be called for short V-PCRF), the PCRF of V-PCRF and home network (Home network PCRF is called for short H-PCRF) sets up effectively contact, V-PCRF is as the concrete execution agency of H-PCRF, H-PCRF is as strategy and the metering data supplier of V-PCRF, and both coordinate mutually, controls the purpose of visit net Media Stream according to home network strategy and charging configuration information to reach the visit net.

In this frame of reference, the medium route can be passed through H-PGW, adopts the home network route pattern, perhaps passes through V-PGW, adopts this locality to produce mode.And,,, realize some Premium Features so that home network can be controlled the route of signaling easily then by the mode (promptly via H-PGW) of home network route for the transmission of IMS signaling.

Fig. 4 typically both can adopt the home network route pattern, also can adopt this locality to produce the scene of pattern.In addition, also exist and have only a PDN GW to be positioned at the scene of home network, this scene is only supported the home network route pattern.And, existing and have only the scene of a PDN GW at the visit net, this scene only supports this locality to produce pattern.

Produce for this locality of using the medium route, at first need UE to set up the IP carrying of visit net at the visit net.Fig. 5 has described a typical UE and has roamed into visited network, is linked into the SAE network and sets up the method flow diagram of IP carrying.

UE is linked into the SAE Access Network, and it is as follows to set up the flow process of visiting the IP carrying of netting:

S501, UE initiates the network attachment request in order to be linked into the SAE network to eNodeB, has carried the sign of UE, the network accessibility of UE, the information such as indication of request distributing IP therein;

S502, eNodeB are that UE selects a MME of service for it, and will adhere to and ask to be forwarded to this MME, and the important informations such as sign with UE also carry to this MME simultaneously;

S503, MME sends location update request message to the HSS of home network, carries the sign of MME, the sign of UE in the message, to inform the current zone of being inserted of UE;

S504, HSS finds out the user data of UE according to the sign of UE, sends to MME.In these certain customers' data of UE, mainly comprise: whether allow to be linked into this Access Network, default APN (Access Point Name, be called for short APN), information such as amount of bandwidth, if HSS decision UE uses the PDN GW of home network, then comprise the address information of this PDN GW simultaneously;

S505, MME receives user data, checks whether UE is allowed access to Access Network, returns user data to HSS and receives response;

Under this scene, if HSS has clearly returned the PDN GW of home network, then MME uses this PDN GW as the medium routing gateway.If HSS only indicates default APN, and do not indicate the PDN GW that needs to use home network, then MME selects local PDN GW as the medium routing gateway in local network.If HSS indicates default APN gateway, and the PDN GW of indication use home network, then MME uses home network PDN GW discovery mechanism (DNS name server mechanism) to find the PDN GW of home network.

S506, HSS send to MME and confirm position renewal response;

S507, MME are that UE selects a S-GW, and the request of setting up default bearing to its transmission.In this request, MME inform sign, the MME of the information of S-GW necessity: UE sign, be the indication of UE distributing IP address, default bandwidth information, PDN GW address etc.;

S508, S-GW send the request of setting up default bearing to PDN GW.In this request, S-GW informs the address of the information of PDN GW necessity: S-GW, default bandwidth information, for the indication of UE distributing IP address etc.;

S509, if necessary, PDN GW is this UE institute's configured strategy and charging regulation, decision information to PCRF request;

S510, PDN GW sets up default bearer according to strategy and charging decision information that PCRF returns, and returns default bearing to S-GW and set up response;

S511, S-GW sends the response that default bearing is set up to MME;

S512, MME send to eNodeB and adhere to response, show that the request that is attached to network of UE is received;

S513, eNodeB sends voice bearer to UE and sets up request message, requires UE to preserve the important information that carrying is set up, and open corresponding ports.In this message, carried: bearer network sign (ID), PDN GW address, the IP address of distributing to UE, bandwidth information etc.;

S514, UE sends voice bearer to eNodeB and sets up response;

S515, eNodeB notice MME attaching process is finished;

S516, MME sends more new bearer request to S-GW, notifies sign, address into the eNodeB of UE service;

S517, S-GW sends more new bearer response to MME;

S518, if desired, then MME sends position updating request to HSS, is notified to the address information that HSS is the PDN GW that UE served, and HSS upgrades this information.

This step in order at the 3GPP network in non-3GPP network switching process, the PDN GW that perhaps is used for MME and is distributed is not under the indicated situation of HSS, requires MME to report the information of PDN GW to HSS.

After S519, HSS receive the position updating request of MME, handle this request, and home position upgrades response.

After the IP of visit net as shown in Figure 5 carrying is set up flow process and finished, correspondingly, just exist for the visit net IP carrying that UE distributes.The IP beared information that is used to identify a UE can comprise: the IP address of the sign of UE (Subscriber Identifier), UE.May there be a plurality of IP carryings in a UE, relies on these key messages, can distinguish which IP carrying and belong to which UE, and which IP carrying belongs to which IP address of UE.Further, according to the Access Network sign in the IP carrying attribute, can distinguish this IP carrying and be positioned at which access network.Promptly, network can learn that UE is currently located at the visit net according to the current access sign that is linked into the visit net of UE, and can be that UE has distributed IAD, IP address according to the current visit net of being known, judge that the visit net is that UE has set up the local IP carrying of visit net.

By as the similar loading establishing process of Fig. 5, UE can be established to the IP carrying of home network, set up the IP carrying of home network after, UE can find the P-CSCF of home network IMS domain, and carries out the IMS registration by home network IP carrying.It should be explicitly made clear at this point that UE is to the process of home network IMS domain registration, might be before UE set up visit net IP carrying, also may be after UE sets up visit net IP carrying.And UE roams into the visit net after setting up home network IP carrying earlier again, also can directly set up home network IP carrying at the visit net.

If UE has set up visit net IP carrying, home network IP carrying, and has been registered to home network IMS domain, then UE can make a call or receive the calling from other UE.

In order to reduce the consumption of Internet resources, home network IMS domain is receiving the calling that UE initiates, or after carrying out the calling of UE, may require UE to select suitable media routing mode, produces mode such as this locality, and optimizing does not have route.When perhaps the angelica network IMS domain need be monitored and measure Media Stream, need then to forbid that UE uses this locality of medium route to produce pattern.

Under these demands, which kind of media routing mode home network IMS domain need select make a strategic decision to UE, and the prerequisite of making a strategic decision, be that home network IMS domain need know that UE nets the summary info of the carrying of being set up in home network, visit, as network identity, media gateway sign (or address), UE assigned IP address etc.Carry for home network IP, then carry out the IMS registration process by UE, home network IMS domain has been known needed summary info, but for visit net IP carrying, because UE does not carry any information and gives home network IMS, then home network IMS can't know that UE can adopt this locality of medium route to produce pattern at the visit net, further, also just can't carry out media routing mode and make a strategic decision.

When UE after IMS home network registration, roam into the visit net, visit net network set up can IP carrying for the medium route after, there are two alternative paths in Media Stream, one is the home network route, one is that route is produced in visit net this locality.But, because the signaling paths that UE uses use is the IP address of home network, no matter be that UE initiates registration to home network, or UE makes a call, the IMS home network does not know that all UE can carry out the path that route is produced in this locality for medium one of visit net existence.That is to say, when UE made a call, the IMS home network can not use this locality of medium route to produce the path because know UE at the visit net, just can't realize that the IMS home network is selected and the medium routed path of control UE yet, realize optimizing the medium Route Selection, avoid the circuitous purpose of medium route.

Same situation also appears in the following scene: UE after having found and set up the IP carrying of home network and having visited the IP carrying of net, utilizes the IP carrying of the home network of having set up to be registered to the IMS home network in the start of visit net.Wherein, UE sets up the process of the IP carrying of home network can be before the IP carrying of setting up the visit net, also can after.

Flow chart shown in Figure 6 has been described under roaming scence of the present invention, and UE makes a call, and home network IMS domain can't be realized the situation of medium Route Selection because lack necessary information.

Before this flow process was initiated, network had been set up home network IP carrying, visit net IP carrying for UE, and UE has also adopted home network IP to be registered in the home network IMS domain.At this moment, IP address allocated makes a call if UE uses home network institute, and in the case, home network can't adopt the medium routing optimality at this situation, promptly can't require medium to produce from visit net this locality.

S601, UE initiates a call request, and this call request is sent on the P-CSCF; Comprise media negotiation information in this call request;

In this call request, what UE used is that home network is its IP address allocated, and the SDP that wherein comprises (Session Description Protocol, Session Description Protocol) data are used to consult link information and media formats.And UE is used to consult the medium route in the SDP data address also is that home network is its IP address allocated.

After S602, P-CSCF receive the call request of UE, therefrom extract and detect descending link information, comprising: call initiator (UE) is used for carrying out information such as the IP address, port of medium conversation;

S603, P-CSCF is transmitted to call request by the network of exhaling eventually, wherein comprises the media negotiation information of call initiator;

S604 is finished media negotiation by the whole side of exhaling, and returns the media negotiation result; Comprising the media information of acceptable call initiator, and we the media information that can provide;

S605, P-CSCF extracts and detect up link information from the media negotiation result who receives, comprising: the side of exhaling is used for carrying out the information such as IP address, port of medium conversation eventually;

S606, P-CSCF asks media authorization to PCRF.In this request, P-CSCF is up link information, descending link information, and other necessary information offers PCRF, carries out authorization check for the PCRF medium, so as can implementation strategy control, operation such as media resource reservation;

S607, PCRF store the session information of SIP layer in this locality, and the session of these information and IP bearing bed is associated;

S608, PCRF sends the media authorization response to P-CSCF, and expression is authorized successful, can carry out operations such as policy control, resource reservation;

S609, P-CSCF notification call initiator (UE) media negotiation is finished; UE needs to adopt the IP address of appointment and port to send Media Stream according to the result of media negotiation;

S610, PCRF are according to the SIP layer conversation link information of obtaining from P-CSCF, and strategy and charging decision information, finish policy control and resource allocation process alternately with PCEF.

S611, UE, P-CSCF etc. finishes the subsequent session handling process.In follow-up flow process, the medium of call initiator are mail in the side of exhaling eventually, must travel back across home network.

Because in call flow shown in Figure 6, the employed signaling of UE address and the media address that is used for media negotiation are the home network IP address allocated; Therefore after session was set up, the medium route need travel back across home network.Under this scene, because home network only knows that UE is linked into the information of home network, can't know that UE is linked into the information of visit net, therefore can't know that the current this locality of medium route of can using of UE produces pattern, the more impossible UE of requirement adopts this locality to produce pattern to optimize the medium route, that is to say, can't carry out the medium Route Selection.

After visit net IP carrying shown in Figure 5 was set up, UE just may adopt visit net this locality of medium route to produce pattern.But under this roaming scence, the IMS home network only can know that UE has set up the signaling and the media bearer path of a home network, and does not know that there is an other path that can supply medium route this locality to produce in UE at the visit net.That is to say that the IMS home network thinks that UE only can use the media bearer path of home network foundation, and the media bearer path that can not select and use other.

Actual conditions are, UE has been assigned with the medium routed path of operable optimization at the visit net, for the IMS home network, need know at first that UE can use medium route this locality to produce at the visit net, select then an optimization, without prejudice to the media routing mode of other decision factor.

Can find that from above analysis under roaming scence, IMS to reduce the unnecessary wasting of resources, at first needs to know that the UE that is arranged in the visit net can use this locality of medium route to produce pattern for the employed media routing mode of UE of can making a strategic decision.In realizing process of the present invention, the inventor finds in the prior art that the IMS home network lacks a kind of method and obtains the access information of UE at the visit net, as Access Network sign, IAD sign, visit net IP address etc.

Have only when IMS by someway, known that UE is linked into the access information of visit net after, can know that just UE can use this locality of medium route to produce pattern.Just can be further according to the local policy or the customer service configuration of IMS home network, whether decision forces UE to use certain specific media routing mode, produces pattern as this locality, and makes UE adjust media routing mode as indicated.

Summary of the invention

The present invention aims to provide a kind of method that is used for home network IMS domain to obtain UE access information, can't obtain the problem of the access information of UE with home network IMS domain in the solution prior art.

In an embodiment of the present invention, a kind of method that is used for home network IMS domain to obtain UE access information is provided, may further comprise the steps: in HSS, prestore and be linked into the access information of visit net about UE, wherein, access information comprises the sign and following one or more the combination of subscriber equipment: the Access Network sign of visit net, the IAD sign of visit net, subscriber equipment is linked into the IP address of visit net; HSS receives the request message from the request access information of the S-CSCF in the home network IMS domain; HSS wherein carries access information to the S-CSCF feeding back response information.

The home network IMS domain that is used for of the foregoing description obtains the method for subscriber equipment access information because adopt the prestore access information of UE of HSS, home network IMS domain can't obtain the problem of the access information of UE in the prior art so overcome, and then can select suitable media routing mode for the UE roaming.

Description of drawings

Accompanying drawing described herein is used to provide further understanding of the present invention, constitutes the application's a part, and illustrative examples of the present invention and explanation thereof are used to explain the present invention, do not constitute improper qualification of the present invention.In the accompanying drawings:

Fig. 1 is network element entity and an annexation schematic diagram thereof related to the present invention in the IMS architecture in the prior art;

Fig. 2 has only described the scene that has the IP carrying in the visit net for be linked into the configuration diagram of home network IMS domain under the existing roaming scence by the SAE access network.

Fig. 3 A is in the prior art, adopts the roaming scence schematic diagram of mobile IP technology;

Fig. 3 B is in the prior art, the method schematic diagram of the solution medium alternate route that the 3GPP tissue proposes;

Fig. 4 is in the prior art, under the SAE framework, under the UE roaming condition, supports the local configuration diagram that produces pattern and home network route pattern simultaneously;

Fig. 5 is in the prior art, after UE roams into the visit net, sets up the method flow diagram of IP carrying at the visit net;

Fig. 6 is in the prior art, UE under roaming condition, the method flow diagram that makes a call for its IP address allocated with home network;

Fig. 7 shows the method flow diagram according to the home network IMS domain to obtain UE access information of the embodiment of the invention;

Fig. 8 shows according to the preferred embodiment of the invention, and UE sets up the method flow diagram of visit net IP carrying;

Fig. 9 shows according to the preferred embodiment of the invention, and the S-CSCF of home network IMS domain is that UE carries out medium method of routing flow chart.

Embodiment

Below with reference to the accompanying drawings and in conjunction with the embodiments, describe the present invention in detail.

Fig. 7 shows the method flow diagram according to the home network IMS domain to obtain UE access information of the embodiment of the invention, may further comprise the steps:

Step S10 prestores in HSS and is linked into the access information of visit net about UE;

Step S20, HSS receives the request message from the request access information of the S-CSCF in the home network IMS domain;

Step S30, HSS wherein carry access information to the S-CSCF feeding back response information.

This method is the access information of UE because employing HSS prestores, and home network IMS domain can't obtain the problem of the access information of UE in the prior art so overcome, and then can be that suitable media routing mode is selected in the UE roaming.

UE sets up visit net IP carrying in visit is netted, and sets up the process that home network IP carried and be registered to the IMS home network, makes UE can use this locality of medium route to produce pattern or home network route pattern.Said process can be divided into following three kinds of situations:

(1) UE sets up the IP carrying in home network, and after successfully being registered to the IMS home network, roams into the visit net, and this moment, UE kept the IP carrying of home network, and has set up the IP carrying of visit net;

(2) UE sets up the IP carrying of home network, the IP carrying of visit net in the start of visit net, utilizes the IP carrying of the home network of having set up to be registered to the IMS home network then; UE sets up home network IP carrying can be before setting up visit net IP carrying, also can after;

(3) UE sets up the IP carrying of home network earlier in the start of visit net, is registered to the IMS home network then, sets up the IP carrying of visit net at last.

Set up in the process of the IP carrying of visiting net at UE, the visit net is distributing PDN GW, IP address for UE, after setting up the IP carrying, the position updating process by MME initiates to HSS initiatively sends to the HSS of home network with the information of PDN GW, the key messages such as IP address information of UE.

UE initiates the S-CSCF of angelica network IMS domain receiving, or after pointing to the calling of UE, be linked into the access information of visit net to HSS inquiry UE, and be kept at the information on the S-CSCF when being registered to home network IMS domain, judge that UE can use this locality to produce or home network medium route according to UE.

So far, after the IMS home network can know that the UE that is positioned at visit net can adopt this locality to produce pattern to carry out media communication, then can carry out the medium Route Selection, adopt the local mode that produces pattern or home network route to carry out media communication, also can force UE to adopt a kind of media communication that carries out in the dual mode at specific transactions.

Preferably, step S10 specifically comprises: set up visit net IP carrying in UE roaming after, MME sends location update message to HSS, wherein carries access information; HSS obtains access information from location update message; HSS preserves access information.

Preferably, before sending location update message, HSS specifically comprises at MME: when being attached to the visit net when the UE roaming, and the location update request message that MME sends to HSS; HSS receives location update request message; HSS sends to MME and requires MME to report the indication of access information.

Preferably, S-CSCF is when receiving the call request of UE or when knowing that UE initiates the IMS registration, send a request message to HSS, require HSS to feed back access information immediately, HSS specifically comprises to the S-CSCF feeding back response information: the UE of HSS analysis request message to know that S-CSCF will ask; HSS retrieves the access information of UE from the information that it prestores; HSS constructs response message, wherein carries access information; HSS is to the S-CSCF feeding back response information.

Preferably, S-CSCF is when knowing that UE initiates the IMS registration, send a request message to HSS, require when access information takes place to upgrade, HSS proactive notification S-CSCF access information, HSS specifically comprises to the S-CSCF feeding back response information: HSS when receive from MME be linked into the access information of renewal of visit net about UE the time, initiatively to the access information of S-CSCF update notifications.

Preferably, this method also comprises: the call request that receives UE; S-CSCF judges that according to access information the current this locality of whether can using of UE produces pattern; If then customer service configuration and/or the local policy of preserving according to this locality is that UE selects this locality in the media routing mode to produce pattern or home network route pattern; If judge and cannot use this locality to produce pattern, then S-CSCF is that UE selects the home network route pattern; S-CSCF notifies selected media routing mode to UE.

Preferably, call request is that rising of UE called for and ask, S-CSCF in the process of carrying out media negotiation, by 380 message that medium route indication information is carried in transmission, the selected media routing mode of notice UE; Or call request is the final call request of pointing to UE, and S-CSCF notifies selected media routing mode specifically to comprise to UE: S-CSCF transmits INVITE (invitation) message to UE, wherein carries selected media routing mode.

Preferably, access information comprises sign and following one or more the combination of UE: the Access Network sign of visit net, the IAD sign of visit net, UE is linked into the IP address of visit net, whether S-CSCF judges according to access information that UE is current and can use this locality to produce pattern specifically to comprise: S-CSCF learns that according to the current access sign that is linked into the visit net of UE UE is currently located at the visit net, and the current visit net of being known is that UE has distributed IAD, IP address to learn that the visit net is that UE has set up the local IP carrying of visit net.

Preferably, this method also comprises: S-CSCF sends to P-CSCF with access information; Receive the call request of UE; P-CSCF judges that according to access information the current this locality of whether can using of UE produces pattern; If then customer service configuration and/or the local policy of preserving according to this locality is that UE selects this locality in the media routing mode to produce pattern or home network route pattern; If judge and cannot use this locality to produce pattern, then P-CSCF is that UE selects the home network route pattern; P-CSCF notifies selected media routing mode to UE.

Preferably, call request is that rising of UE called for and ask, P-CSCF in the process of carrying out media negotiation, by 380 message that medium route indication information is carried in transmission, the selected media routing mode of notice UE; Or call request is the final call request of pointing to UE, and P-CSCF notifies selected media routing mode specifically to comprise to UE: P-CSCF transmits INVITE to UE, wherein carries selected media routing mode.

Preferably, access information comprises sign and following one or more the combination of UE: the Access Network sign of visit net, the IAD sign of visit net, UE is linked into the IP address of visit net, whether P-CSCF judges according to access information that UE is current and can use this locality to produce pattern specifically to comprise: P-CSCF learns that according to the current access sign that is linked into the visit net of UE UE is currently located at the visit net, and is that UE has distributed IAD, IP address to learn that the visit net is that UE has set up the local IP carrying of visit net according to the current visit net of being known.

Fig. 8, the 9th, the preferred embodiments of the present invention are used to be described under the roaming scence of the present invention, and how the IMS home network correctly knows the media routing mode that UE can use, and further carries out the medium method of routing.

Fig. 8 shows according to the preferred embodiment of the invention, and UE sets up the method flow diagram of visit net IP carrying.This embodiment has described UE and has been positioned at the visit net, when setting up visit net IP carrying, UE is linked into the process that the access information of visiting net sends to the HSS of home network.

S801, UE initiates the network attachment request in order to be linked into the SAE network to eNodeB, has carried the sign of UE, the network accessibility of UE, the information such as indication of request distributing IP therein;

S802, eNodeB are that UE selects a MME of service for it, and will adhere to and ask to be forwarded to this MME, and the important informations such as sign with UE also carry to this MME simultaneously;

S803, MME sends location update request message to the HSS of home network, carries the sign of MME, the sign of UE in the message, to inform the current zone of being inserted of UE;

S804, HSS finds out the user data of UE according to the sign of UE, sends to MME.In these certain customers' data of UE, mainly comprise: whether allow to be linked into this Access Network, default APN (Access Point Name, be called for short APN), information such as amount of bandwidth, if HSS decision UE uses the PDN GW of home network, then comprise the address information of this PDN GW simultaneously;

And, in sending to the user data of MME, HSS can carry indication, inform that MME allows UE to use Local Breakout mode to carry out the medium route, and require MME that the access information that UE is linked into visit net is reported HSS, concrete comprises: the visit net IP address that network identity, IAD sign or address (sign or the address that refer to PDN GW), UE are assigned with etc.

S805, MME receives user data, checks whether UE is allowed access to Access Network, returns user data to HSS and receives response;

S806, HSS send to MME and confirm position renewal response;

S807, MME are that UE selects a S-GW, and the request of setting up default bearing to its transmission.In this request, MME inform sign, the MME of the information of S-GW necessity: UE sign, be the indication of UE distributing IP address, default bandwidth information, PDN GW address etc.;

S808, S-GW send the request of setting up default bearing to PDN GW.In this request, S-GW informs the address of the information of PDN GW necessity: S-GW, default bandwidth information, for the indication of UE distributing IP address etc.;

S809, if necessary, PDN GW is this UE institute's configured strategy and charging regulation, decision information to PCRF request;

S810, PDN GW sets up default bearer according to strategy and charging decision information that PCRF returns, and returns default bearing to S-GW and set up response;

S811, S-GW sends the response that default bearing is set up to MME;

S812, MME send to eNodeB and adhere to response, show that the request that is attached to network of UE is received;

S813, eNodeB sends voice bearer to UE and sets up request message, requires UE to preserve the important information that carrying is set up, and open corresponding ports.In this message, carried: bearer network sign (ID), PDN GW address, the IP address of distributing to UE, bandwidth information etc.;

S814, UE sends voice bearer to eNodeB and sets up response;

S815, eNodeB notice MME attaching process is finished;

S816, MME sends more new bearer request to S-GW, notifies sign, address into the eNodeB of UE service;

S817, S-GW sends more new bearer response to MME;

S818, if desired, then MME sends position updating request to HSS, is notified to the address information that HSS is the PDN GW that UE served, and HSS upgrades this information.

Report UE to be linked into the indication of the access information of visit net according to the given MME that requires when issuing user data of HSS in the step 804.When MME determines above-mentioned situation, promptly initiate position updating process, and in position updating process, carry the following summary info that UE is linked into the visit net: the sign of UE, network identity, IAD sign (being the sign of PDN GW), UE assigned IP address etc. herein.

After S819, HSS receive the position updating request of MME, handle this request, and home position upgrades response.

In this step, HSS extracts the access information that the UE that carries in the message is linked into visit net simultaneously, as network identity, IAD sign, UE assigned IP address etc., and with this storage in the relevant information of UE.So that for S-CSCF among the later IMS provides data to the access information that HSS request UE is linked into the visit net.

In flow process shown in Figure 8, MME requires MME to report UE to be linked into the indication of the access information of visit net according to the HSS indication of receiving, PDN GW distributes, the position updating process of finishing thickness is set up in the IP carrying and trigger.Further, MME can be not yet according to the indication of HSS, and the position updating process shown in the execution in step 818 unconditionally, and report UE to be linked into the access information of visit net to HSS therein.If the unconditional execution in step 818 of MME, then in step 804, HSS need not to carry and requires MME to report UE to be linked into the indication of the access information of visit net.

By flow process shown in Figure 8, be that UE distributes PDN GW, sets up in the process of IP carrying at the visit net, upgrade alternately by the position of MME and HSS, the access information that UE is linked into the visit net successfully is saved on the HSS.After, if UE initiates the IMS registration process, then HSS can send to S-CSCF to the response of HSS request msg with the access information that this UE is linked into the visit net by S-CSCF in the registration process.Perhaps, if UE has been registered to IMS, then S-CSCF can initiatively inquire about the access information that this UE is linked into the visit net to HSS.

After the process of having finished Fig. 8, S-CSCF can make full use of the access information that the UE that can obtain is linked into the visit net, calling for the UE initiation, or the end of pointing to UE exhale, according to local policy or customer service configuration, whether decision requires UE to adopt the media routing mode of appointment, and further notifies UE to adopt the media routing mode of appointment.

Fig. 9 shows according to the preferred embodiment of the invention, and home network IMS domain carries out medium method of routing flow chart.This embodiment has described when UE makes a call or exhaled eventually, the S-CSCF of IMS home network inquires the access information that UE is linked into the visit net from HSS, and according to the access information of the home network of being stored in the UE registration process, judge whether UE can use this locality of medium route to produce pattern, can judge whether the key element decision adopts specific media routing mode to carry out media communication according to local policy, customer service configuration etc. further.

Step 901, S-CSCF receives and exhales the end of pointing to UE; Or S-CSCF receives the calling that UE initiates.Exhale above-mentioned end and carry media negotiation information in message and the call message;

Step 902, S-CSCF comprises: network identity, IAD sign, assigned IP address etc. to the access information that HSS request UE is linked into the visit net.HSS finds out the relevant information of this UE, returns to S-CSCF;

Step 903, S-CSCF preserves the access information that UE is linked into the visit net in this locality, and is registered to institute's canned data in the process of home network according to UE, judges that the current this locality of medium route of whether can using of UE produces pattern;

If S-CSCF judges UE and have visit net, two IP carryings of home network, think that then this locality that UE both can the support media route produces pattern, home network route pattern that also can the support media route.

Step 904, S-CSCF determines the media routing mode that UE uses according to customer service configuration and/or local policy, described media routing mode is meant: use this locality to produce pattern, or use the home network route pattern;

Step 905 if S-CSCF need specify the employed media routing mode of UE, is not this route pattern and current UE is used, then notifies UE to use the media routing mode of this appointment.

If the calling procedure that UE initiates, S-CSCF can be by sending 380 message to UE, and this message is a message that requires UE to attempt other service (Alternative Service).In this message, carry the medium route indication information that requires UE to make a call with designated mode.

If call out is to exhale the end of pointing to UE, and S-CSCF can carry medium route indication information when INVITE (invitation) request is transmitted to UE, require UE to carry out media communication with specific media routing mode, also can specify the employed media communication of UE address.

S-CSCF has only when need specify the employed media routing mode of UE, just need by 380 message (rise exhale at UE), or, notify UE to use specific media routing mode by specifying the medium routing iinformation (being exhaled eventually) in the media negotiation among the INVITE at UE.If S-CSCF does not need to specify, then handle according to existing procedure.

After step 906, media routing mode consulted to finish, S-CSCF continued to handle the subsequent session process.

S-CSCF shown in Figure 9 obtains the method that UE is linked into the access information of visit net, is initiatively to inquire about this information to HS S when S-CSCF handles session.In addition, how to obtain the access information that UE is linked into the visit net at S-CSCF, also have following examples, step is as follows:

(1) UE is in the process of carrying out the IMS registration, and S-CSCF asks UE to be linked into the access information of visit net to HSS request user data the time simultaneously.And further, S-CSCF can subscribe to the change of this access information simultaneously in request process;

(2) HSS is when S-CSCF sends user data, and the access information that UE is linked into the visit net is also issued S-CSCF;

(3) in subsequent process, if S-CSCF has subscribed to the access information change that UE is linked into the visit net to HSS, then when MME after HSS has upgraded UE and has been linked into the access information that visit nets, HSS need notify the change of this information of S-CSCF.

In sum, after the invention provides under the next generation mobile communication network LTE/SAE framework UE and being positioned at or roaming into certain Access Network, home network IMS domain is selected the method for the media routing mode (this locality is produced or the home network route pattern) of UE, be applied to the IMS access network, after UE roams into the visit net, can effectively solve the IMS home network and can't know that whether UE produces the problem of pattern in this locality of support media route, and then can be that this UE selects the media routing mode optimized.

The above is the preferred embodiments of the present invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.

Claims

1. one kind is used for the method that home network IMS domain obtains the subscriber equipment access information, it is characterized in that, may further comprise the steps:

In home subscriber server, prestore and be linked into the access information of visit net about subscriber equipment, wherein, described access information comprises the sign and following one or more the combination of described subscriber equipment: the Access Network sign of described visit net, the IAD sign of described visit net, described subscriber equipment is linked into the IP address of visit net;

Described home subscriber server receives the request message from the described access information of request of the service call session control function entity in the home network IMS domain;

Described home subscriber server wherein carries described access information to described service call session control function entity feeding back response information;

Wherein, described service call session control function entity is when knowing that described subscriber equipment is initiated the IMS registration, send described request message to described home subscriber server, require when described access information takes place to upgrade, the described access information of the described service call session control function entity of described home subscriber server proactive notification, described home subscriber server specifically comprises to described service call session control function entity feeding back response information:

Described home subscriber server when receive from described Mobility Management Entity be linked into the access information of renewal of visit net about described subscriber equipment the time, initiatively notify the access information of described renewal to described service call session control function entity.

2. method according to claim 1 is characterized in that, the access information that is linked into visit net about subscriber equipment that prestores in home subscriber server specifically comprises:

Set up visit net IP carrying at described user's set roaming after, Mobility Management Entity sends location update message to described home subscriber server, wherein carries described access information;

Described home subscriber server obtains described access information from described location update message;

Described home subscriber server is preserved described access information.

3. method according to claim 2 is characterized in that, specifically comprises before described home subscriber server sends location update message at Mobility Management Entity:

When being attached to the visit net when described user's set roaming, described Mobility Management Entity sends location update request message to described home subscriber server;

Described home subscriber server is received described location update request message;

Described home subscriber server sends to described Mobility Management Entity and requires described Mobility Management Entity to report the indication of described access information.

4. method according to claim 1, it is characterized in that, described service call session control function entity is when receiving the call request of described subscriber equipment or when knowing that described subscriber equipment is initiated the IMS registration, send described request message to described home subscriber server, require described home subscriber server to feed back described access information immediately, described home subscriber server specifically comprises to described service call session control function entity feeding back response information:

Described home subscriber server is resolved described request message and is wanted requesting users equipment to know described service call session control function entity;

Described home subscriber server retrieves the described access information of described subscriber equipment from the information that it prestores;

Described home subscriber server is constructed described response message, wherein carries described access information;

Described home subscriber server feeds back described response message to described service call session control function entity.

5. according to each described method of claim 1 to 4, it is characterized in that, also comprise:

Receive the call request of described subscriber equipment;

Described service call session control function entity judges that according to described access information the current this locality of whether can using of described subscriber equipment produces pattern;

If then customer service configuration and/or the local policy of preserving according to this locality is that described subscriber equipment selects this locality in the media routing mode to produce pattern or home network route pattern;

If judge and cannot use this locality to produce pattern, then described service call session control function entity is that described subscriber equipment is selected the home network route pattern;

Described service call session control function entity is to the selected media routing mode of described notification of user equipment.

6. method according to claim 5 is characterized in that,

Described call request is that rising of described subscriber equipment called for and ask, described service call session control function entity is in the process of carrying out media negotiation, by 380 message that medium route indication information is carried in transmission, notify described subscriber equipment selected media routing mode; Or

Described call request is a final call request of pointing to described subscriber equipment, described service call session control function entity specifically comprises to the selected media routing mode of described notification of user equipment: described service call session control function entity is transmitted invitation message to described subscriber equipment, wherein carries selected media routing mode.

7. method according to claim 5 is characterized in that, whether described service call session control function entity is judged according to described access information that described subscriber equipment is current and can be used this locality to produce pattern specifically to comprise:

Described service call session control function entity learns that according to the current Access Network sign that is linked into visit net of described subscriber equipment described subscriber equipment is currently located at the visit net, and the current visit net of being known be described user equipment allocation IAD sign, IP address learn that the visit net is that described subscriber equipment has been set up the local IP carrying of visit net.

8. according to each described method of claim 1 to 4, it is characterized in that, also comprise:

Described service call session control function entity sends to proxy call conversation control function entity with described access information;

Receive the call request of described subscriber equipment;

Described proxy call conversation control function entity judges that according to described access information the current this locality of whether can using of described subscriber equipment produces pattern;

If judge and cannot use this locality to produce pattern, then described proxy call conversation control function entity is that described subscriber equipment is selected the home network route pattern;

Described proxy call conversation control function entity is to the selected media routing mode of described notification of user equipment.

9. method according to claim 8 is characterized in that,

Described call request is that rising of described subscriber equipment called for and ask, described proxy call conversation control function entity is in the process of carrying out media negotiation, by 380 message that medium route indication information is carried in transmission, notify described subscriber equipment selected media routing mode; Or

Described call request is a final call request of pointing to described subscriber equipment, described proxy call conversation control function entity specifically comprises to the selected media routing mode of described notification of user equipment: described proxy call conversation control function entity is transmitted invitation message to described subscriber equipment, wherein carries selected media routing mode.

10. method according to claim 8 is characterized in that, whether described proxy call conversation control function entity is judged according to described access information that described subscriber equipment is current and can be used this locality to produce pattern specifically to comprise:

Described proxy call conversation control function entity learns that according to the current Access Network sign that is linked into visit net of described subscriber equipment described subscriber equipment is currently located at the visit net, and according to the current visit net of being known be described user equipment allocation IAD sign, IP address learn that the visit net is that described subscriber equipment has been set up the local IP carrying of visit net.