CN102811471B

CN102811471B - Internetwork transferring method for priority session accessing and user equipment

Info

Publication number: CN102811471B
Application number: CN201110144754.0A
Authority: CN
Inventors: 衣强; 金辉
Original assignee: Huawei Device Co Ltd
Current assignee: Huawei Device Co Ltd
Priority date: 2011-05-31
Filing date: 2011-05-31
Publication date: 2017-04-12
Anticipated expiration: 2031-05-31
Also published as: CN102811471A

Abstract

The embodiment of the invention provides an internetwork transferring method for priority session accessing and user equipment (UE). The internetwork transferring method for priority session accessing comprises the following steps: allowing the UE to transfer from a source packet switched domain to a target circuit switched domain, and determining that a session on the UE has a priority characteristic in the source packet switched domain; and sending connection management service requesting information to a mobile switching center server of the target circuit switched domain by the user equipment, wherein the connection management service requesting information carries priority level information of the session on the UE in the source packet switched domain. According to the embodiment of the invention, when called UE with a priority session transfers from the packet switched domain to the circuit switched domain, the priority of the session on called UE is kept unchanged.

Description

The method shifted between priority session access network and user equipment

Technical field

The present embodiments relate to a kind of method shifted between communication technical field, more particularly to priority session access network And user equipment.

Background technology

Multimedia priority service (Multimedia Priority Service；Hereinafter referred to as：MPS country can be caused) Safety or emergent service users provide priority conversational services by public network, and this priority conversational services can be in network Proper communication is realized under congestion situation.Generally MPS user is governmental certification focal pointe, is occurred in major accident or disaster When, these focal pointes generally need to timely respond to accident and process, therefore give these user priority level characteristics, network The conversation request of the side just priority treatment MPS user, realizes the normal delivery of key message.

The user of MPS of having contracted can use MPS contracted user's equipment (MPS-subscribed User Equipment； Hereinafter referred to as：MPS-subscribed UE) initiate the internet protocol multimedia subsystem (Internet with priority Protocol Multimedia Subsystem；Hereinafter referred to as：IMS) session or use normal user equipments (User Equipment；Hereinafter referred to as：UE the IMS sessions with priority are initiated), and the IMS sessions is carried in conversation request for excellent The configured information of first level session, so as to network equipment can be according to the priority indication information of the session, the priority treatment meeting Words are asked and are preferably the session Resources allocation, and network equipment can also be according to priority service CAMEL-Subscription-Information to preferential in addition Level conversation request is verified and is processed.

In addition, in circuit switching (Circuit Switched；Hereinafter referred to as：CS) domain contracted the UE of priority service can To initiate the session with priority in CS domains, calling UE adds the prefix for representing priority service before called number, mobile to hand over Switching center9 (Mobile Switching Center；Hereinafter referred to as：MSC) server is being received with priority indication prefix After session establishment request (setup) message, the priority subscription data of user is verified, and obtain the priority level of user, pass to Opposite end.

Callee side MSC server receives the session establishment request message with priority, preferentially divides according to priority indication Carry with radio frequency resource and foundation, after completing to call UE, setup message is sent to called UE, complete session establishment process.

It is enhanced preferentially to seize (enhanced Multi-Level Precedence and Pre- with resource in advance emption；Hereinafter referred to as：EMLPP) signing service of the business for CS domains, the user of eMLPP business of having contracted can be sent out in CS domains The calling with priority is played, calling UE is in connection management service request (Connect Management Service Request；Hereinafter referred to as：CM Service Request) priority level of session is indicated in message to network side, called UE can With the priority level that the priority level of the session is obtained from setup message and the session is preserved.

But, find in the process invention people for realizing the embodiment of the present invention：In prior art, the quilt with priority session UE is in packet switch (Packet Switched；Hereinafter referred to as：When PS) shifting between domain and CS domains, no matter whether the called UE With priority signing service (including the eMLPP business in CS domains), when called UE receives the conversation request with priority, the tool The conversation request for having priority should be processed according to the priority character of calling UE and priority-level.So work as called UE When carrying out shifting between access network, the called UE can initiate a new conversation request in the target access network of transfer, and called UE is sent out The priority character and priority-level of the new conversation request for rising will be according to the priority character of called UE and priority level It is not configured, the priority of the priority-level of priority service or called UE and calling UE if called UE is not contracted Rank is different, just occurs that called UE cannot keep session priority or the priority of session to differ before and after shifting between access network The problem of cause, or cannot be according to the problem of the session in the priority Dialog processing called UE.

The content of the invention

The embodiment of the present invention provides a kind of method and user equipment shifted between priority session access network, to realize having When the called subscriber equipment of priority session is shifted between packet-switched domain and circuit commutative field, it is ensured that on the called subscriber equipment The priority of session is constant.

The embodiment of the present invention provides a kind of method shifted between priority session access network, including：

User equipment is shifted from source packet switching domain to objective circuit switching domain, determines that the session on the user equipment exists The source packet switching domain has priority character；

The user equipment sends connection management business to the Mobile Switching Center Server of the objective circuit switching domain Request message, the session that the connection management business request information is carried on the user equipment are exchanged in the source packet The priority level information in domain, so that the Mobile Switching Center Server knows that the session on the user equipment exists The priority level information of the source packet switching domain, by the session on the user equipment by the source packet switching domain The objective circuit switching domain is transferred to, and the session is kept in the priority character and priority of the source packet switching domain Class information.

The embodiment of the present invention also provides a kind of method shifted between priority session access network, including：

The connection management service request that the Mobile Switching Center Server receive user equipment of objective circuit switching domain sends Message, the connection management business request information are the user equipmenies from source packet switching domain to the objective circuit switching domain Transfer, determines what the session on the user equipment was sent after the source packet switching domain has priority character, described Connection management business request information carries priority level of the session on the user equipment in the source packet switching domain Other information；

The session on the user equipment is turned by the Mobile Switching Center Server by the source packet switching domain The objective circuit switching domain is moved on to, and the session is kept in the Session Hand-off in the preferential of the source packet switching domain Level characteristics and priority level information.

The Mobile Switching Center Server of objective circuit switching domain receives internet protocol multimedia subsystem network entity Priority level information of the session on the user equipment of transmission in source packet switching domain；

The Mobile Switching Center Server sends resource allocation to the base station sub-system of the objective circuit switching domain please Message is sought, and the priority level information is carried in the resource allocation request message, so that the base station sub-system is excellent It is first the resource allocation request message Resources allocation, by the session on the user equipment by the source packet switching domain It is transferred to the objective circuit switching domain.

The session transfer request message that proxy call conversation control function entity receive user equipment sends, the session turn Move Session Hand-off mark and priority session configured information that request message carries the user equipment；

The proxy call conversation control function entity determines the session transfer request according to Session Hand-off mark Message is circuit commutative field to after the session transfer request message of packet-switched domain, and the session transfer request message is sent Internet protocol multimedia subsystem network entity is given, the session on the user equipment is shifted by the circuit commutative field To the packet-switched domain, the session transfer request message carries the priority session configured information and Session Hand-off mark Know.

The embodiment of the present invention also provides a kind of user equipment, including：

First determining module, for when the user equipment is shifted from source packet switching domain to objective circuit switching domain, Determine that the session on the user equipment has priority character in the source packet switching domain；

First sending module, for determining the session on the user equipment in the source point in first determining module After group switching domain has priority character, connecting tube is sent to the Mobile Switching Center Server of the objective circuit switching domain Reason business request information, the session that the connection management business request information is carried on the user equipment are divided in the source Group switching domain priority level information so that the Mobile Switching Center Server know it is described on the user equipment Priority level information of the session in the source packet switching domain, by the session on the user equipment by the source packet Switching domain is transferred to the objective circuit switching domain, and keep the session in the priority character of the source packet switching domain and Priority level information.

The embodiment of the present invention also provides a kind of Mobile Switching Center Server, including：

4th receiver module, for the connection management business request information that receive user equipment sends, the connection management Business request information be the user equipment from source packet switching domain to the objective circuit switching domain shift when, determine the use What the session on the equipment of family was sent after the source packet switching domain has priority character, the connection management service request Message carries priority level information of the session on the user equipment in the source packet switching domain；

Session Hand-off module, for the session on the user equipment is transferred to institute by the source packet switching domain Objective circuit switching domain is stated, and the session is kept in the Session Hand-off in the priority character of the source packet switching domain And priority level information.

Second receiver module, for receiving on the user equipment that internet protocol multimedia subsystem network entity sends Priority level information of the session in source packet switching domain；

Second sending module, after receiving the priority level information in second receiver module, to institute The base station sub-system for stating objective circuit switching domain sends resource allocation request message, and takes in the resource allocation request message With the priority level information, so that the base station sub-system is preferably the resource allocation request message Resources allocation, will The session on the user equipment is transferred to the objective circuit switching domain by the source packet switching domain.

The embodiment of the present invention also provides a kind of proxy call conversation control function entity equipment, including：

3rd receiver module, for the session transfer request message that receive user equipment sends, the session transfer request Message carries the Session Hand-off mark and priority session configured information of the user equipment；

3rd determining module, the Session Hand-off mark for being received according to the 3rd receiver module determine that the session turns It is session transfer request message of the circuit commutative field to packet-switched domain to move request message；

3rd sending module, for determining that the session transfer request message is circuit switching in the 3rd determining module The session transfer request message is sent to Internet Protocol many to after the session transfer request message of packet-switched domain by domain Session on the user equipment is transferred to the packet switch by the circuit commutative field by media subsystem network entity Domain, the session transfer request message carry the priority session configured information and Session Hand-off mark.

By the embodiment of the present invention, Mobile Switching Center Server can know that the session on user equipment is handed in source packet The priority level information in domain is changed, and the session on the user equipment is being transferred to into objective circuit friendship by source packet switching domain During changing domain, above-mentioned session can be kept in the priority character of source packet switching domain；In addition, agent call session control Functional entity can also know priority level information of the session on user equipment in circuit commutative field, by user equipment Session packet-switched domain is transferred to by circuit commutative field during, it is also possible to keep the session on above-mentioned user equipment in electricity The priority character of road switching domain.Such that it is able to realize the called subscriber equipment with priority session in packet-switched domain and electricity When shifting between the switching domain of road, it is ensured that on the called subscriber equipment, the priority of session is constant.

Description of the drawings

In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing Accompanying drawing to be used needed for having technology description is briefly described, it should be apparent that, drawings in the following description are these Some bright embodiments, for those of ordinary skill in the art, on the premise of not paying creative work, can be with root Other accompanying drawings are obtained according to these accompanying drawings.

Fig. 1 is the flow chart of the embodiment of the method one shifted between priority session access network of the present invention；

Fig. 2 is the flow chart of the embodiment of the method two shifted between priority session access network of the present invention；

Fig. 3 is the flow chart of the embodiment of the method three shifted between priority session access network of the present invention；

Fig. 4 is the flow chart of the embodiment of the method four shifted between priority session access network of the present invention；

Fig. 5 is the flow chart of the embodiment of the method five shifted between priority session access network of the present invention；

Fig. 6 is the flow chart of the embodiment of the method six shifted between priority session access network of the present invention；

Fig. 7 is the flow chart of the embodiment of the method seven shifted between priority session access network of the present invention；

Fig. 8 is the structural representation of user equipment embodiment of the present invention；

Fig. 9 is the structural representation of user equipment embodiment of the present invention two；

Figure 10 is the structural representation of Mobile Switching Center Server embodiment of the present invention；

Figure 11 is the structural representation of Mobile Switching Center Server embodiment of the present invention two；

Figure 12 is the structural representation of Mobile Switching Center Server embodiment of the present invention three；

Figure 13 is the structural representation of Mobile Switching Center Server example IV of the present invention；

Figure 14 is the structural representation of proxy call conversation control function entity apparatus embodiments of the present invention；

Figure 15 is the structural representation of proxy call conversation control function entity apparatus embodiments of the present invention two.

Specific embodiment

To make purpose, technical scheme and the advantage of the embodiment of the present invention clearer, below in conjunction with the embodiment of the present invention In accompanying drawing, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is The a part of embodiment of the present invention, rather than the embodiment of whole.Based on the embodiment in the present invention, those of ordinary skill in the art The every other embodiment obtained on the premise of creative work is not made, belongs to the scope of protection of the invention.

Fig. 1 is the flow chart of the embodiment of the method one shifted between priority session access network of the present invention, as shown in figure 1, should The method shifted between priority session access network can include：

Step 101, user equipment are shifted from source packet switching domain to objective circuit switching domain, are determined on the user equipment Session has priority character in source packet switching domain.

Specifically, when user equipment has moved out the coverage of packet-switched domain, into the covering model of circuit commutative field When enclosing, user equipment is needed from from source packet switching domain to the transfer of objective circuit switching domain.

Wherein, priority character refers to that the session on the user equipment is priority session in source packet switching domain.

Step 102, user equipment send connection management business to the Mobile Switching Center Server of objective circuit switching domain Request message, the connection management business request information carry priority-level of the session on user equipment in source packet switching domain Information, so that Mobile Switching Center Server knows that the session on user equipment is believed in the priority-level of source packet switching domain Breath, can keep above-mentioned session in source when the session on user equipment is transferred to objective circuit switching domain by source packet switching domain The priority character and priority level information of packet-switched domain.

In the present embodiment, above-mentioned connection management business request information can also carry source packet switching domain and hand over to objective circuit Change the transfer configured information in domain.

Further, user equipment sends connection management business to the Mobile Switching Center Server of objective circuit switching domain Before request message, when the user equipment is to support the user equipment of eMLPP, the user equipment can also be by the user equipment On session be converted to the corresponding priority-levels of eMLPP in the priority-level of packet-switched domain.

Further, user equipment sends connection management business to the Mobile Switching Center Server of objective circuit switching domain After request message, the user equipment can also receive Mobile Switching Center Server transmission for above-mentioned connection management business Request message receives response message, and this receives response message is that Mobile Switching Center Server will be from connection management service request The priority level information obtained in message is authenticated to internet protocol multimedia subsystem, in the priority level information After certification passes through, user equipment is sent to.

In the present embodiment, user equipment sends connection management industry to the Mobile Switching Center Server of objective circuit switching domain After business request message, priority level information can also be converted to and meet conversation initialization association by Mobile Switching Center Server The priority level information of view signalling, and send after carrying conversion to internet protocol multimedia subsystem network entity The session transfer request message of priority level information so that the session on user equipment according to priority mode by source packet Switching domain is transferred to objective circuit switching domain.

In the present embodiment, user equipment determines the user when source packet switching domain is shifted to objective circuit switching domain After source packet switching domain has priority character, the session on the user equipment is existed by the user equipment for session on equipment The priority level information of source packet switching domain is sent to the Mobile Switching Center Server of objective circuit switching domain, such that it is able to Realize that Mobile Switching Center Server knows priority level information of the session on user equipment in source packet switching domain, will use Session on the equipment of family is transferred to objective circuit switching domain by source packet switching domain, and keeps above-mentioned session in source packet switching domain Priority character and priority level information.

Fig. 2 is the flow chart of the embodiment of the method two shifted between priority session access network of the present invention, as shown in Fig. 2 should The method shifted between priority session access network can include：

Step 201, the connection management of the Mobile Switching Center Server receive user equipment transmission of objective circuit switching domain Business request information, the connection management business request information are that user equipment is turned from source packet switching domain to objective circuit switching domain During shifting, determine what the session on the user equipment was sent after source packet switching domain has priority character, the connection management Business request information carries priority level information of the session on user equipment in source packet switching domain.

Above-mentioned session on user equipment is transferred to by step 202, Mobile Switching Center Server by source packet switching domain Objective circuit switching domain, and above-mentioned session is kept in Session Hand-off in the priority character and priority level of source packet switching domain Other information.

Further, in a kind of implementation of the present embodiment, after step 201, Mobile Switching Center Server may be used also Receive response message for above-mentioned connection management business request information to send to user equipment, it is to move that this receives response message The priority level information obtained from connection management business request information is authenticated by dynamic switching centre's server to IMS, After above-mentioned priority level information certification passes through, the user equipment is sent to.

Further, in another kind of implementation of the present embodiment, after step 201, Mobile Switching Center Server is also Above-mentioned priority level information can be converted to and meet conversation initialized protocol (Session Initiation Protocol； Hereinafter referred to as：SIP) the priority level information of signalling, and the priority level carried after conversion is sent to IMS network entity The session transfer request message of other information, so that the above-mentioned session on the user equipment is handed over by source packet according to priority mode Change domain and be transferred to objective circuit switching domain.

Above-described embodiment can realize that Mobile Switching Center Server knows that the session on user equipment is exchanged in source packet The priority level information in domain, it is possible to which the session on user equipment is being transferred to objective circuit by source packet switching domain by realization Above-mentioned session is kept during switching domain in the priority character and priority level information of source packet switching domain.

Fig. 3 is the flow chart of the embodiment of the method three shifted between priority session access network of the present invention, used as Fig. 1 of the present invention With a kind of specific implementation of embodiment illustrated in fig. 2, this gives the bimodulus UE with priority session is used as quilt Make UE that the process in CS domains is transferred to by ps domain, wherein the called UE has an eMLPP business in CS domains, or UE does not contract any pass It is to support the UE of eMLPP business in the business but UE of priority session.

As shown in figure 3, the method shifted between the priority session access network can include：

Step 301, UE is in RACH to base station sub-system (Base Station Subsystem；Hereinafter referred to as： BSS) request distributes channel to set up Radio Resource (Radio Resource；Hereinafter referred to as：RR) layer connection.

Specifically, UE can be to BSS channel requests (Channel Request) message, with to BSS request distribution letters Road.

Step 302, BSS are that UE distributes dedicated channel and is returned for the response message of the channel request message.

Specifically, BSS can be to distribute (Immediate Assignment) message immediately to the response message that UE is returned.

Step 303, after UE receives the response message of BSS returns, UE stops to BSS channel request messages.

Step 304, UE determine that the action performed by the UE is that ps domain is shifted to CS domains, and the session on the UE is preferential Level session.

Step 305, UE send CM Service Request message to MSC server.In the present embodiment, CM Service The cell that Request message includes can be as shown in table 1.

Table 1

When the session on UE is when former ps domain is priority session, then UE can be in the CM Service Request message Priority level information of the session on the UE in ps domain is carried, while PS is carried in the CMService Request message Transfer configured information of the domain to CS domains, the transfer configured information of the ps domain to CS domains indicate the CM Service Request message It is the request message sent to the transfer in CS domains by ps domain.Due to the UE in the present embodiment be support eMLPP business UE, because This send CM Service Request message before, UE can by the session on the UE ps domain priority level information The corresponding priority-level of eMLPP business is set to, and is carried in CM Service Request message.

Specifically, the session on the UE can be disappeared by CM Service Request in the priority level information of ps domain Priority (priority) item of breath represents that the transfer configured information of ps domain to CS domains can be by CM type of service (CM Service type) item one optional type of service position " call establishment for PS to CS of increase With this, transfer ", represents that the CM Service Request message is the session that sent to the transfer in CS domains by ps domain Request message.So, UE would not be verified to the priority level information in the CMService Request message, MSC After server receives the CMService Request message, the CM Service are judged according to the transfer configured information Request message is session establishment request message or session transfer request message, if it is determined that the CM Service Request message is session transfer request message, then MSC server does not check the eMLPP CAMEL-Subscription-Information in CS domains of the UE.

In addition, in order to prevent UE from arranging the priority-level of mistake, MSC server can be to from CM Service The priority level information obtained in Request message is concentrated and continuous server (Service to network side traffic Centralization and Continuity Application Server；Hereinafter referred to as：SCCAS) it is authenticated, with true Protect UE and use correct priority-level.Specifically, the certification to above-mentioned precedence information can be by the notice (INFO) of SIP Message is realized, can specifically be included：

Step 305a, MSC server send authentication request message to SCC AS, and the authentication request message can be SIP INFO, purpose (subject) header field of the SIP INFO is priority certification (priority Authentication), the purpose for representing the SIP INFO is that priority level information is authenticated；The SIP INFO The priority header fields of message carry the priority level information obtained from CM Service Request message.The SIP Identity of the From header fields of INFO for UE, for example：The telephone number or international mobile subscriber identity of the UE (International Mobile Subscriber Identification Number；Hereinafter referred to as：IMSI), the SIP INFO is with outer transmission message, i.e., the channel newly set up between MSC server and SCC AS.According to the identity of UE, SCC AS can find the priority level information that session (being nearest state of activation session herein) is specified on UE, and and SIP Priority level information in INFO is compared, and judges whether the priority level information that UE is arranged is correct.

Step 305b, MSC server receive the authentication response message that SCC AS are returned, and the authentication response message can also be SIP INFO, authentication information (the Authentication Information in the authentication response message；Hereinafter referred to as： Authentication-Info)：Receive (accept)/refusal (reject), represent the result of certification；The authentication response message In priority heads carry the priority level information that carries in the SIPINFO message that MSC server sends, represent SCC AS Receive the priority-level.

If the authentication information in the authentication response message that SCC AS are returned is to receive, MSC server continues executing with step Rapid 306 and subsequent step, if the authentication information in the authentication response messages that return of SCC AS is refusal, MSC server to UE returns refuse information, for example：Connection management service denial message (Connect Management service reject) and Terminate this flow process.

Step 306, MSC server receive response message to UE return CM Service Request message, for example：Even Connect management business and receive (Connect Management Service Accept；Hereinafter referred to as：CM Service Accept) Message.

Step 307, UE send session establishment request to MSC server after CM Service Accept message is received (setup) message, the called number of the setup message are Session Hand-off number (the Session Transfer Number of UE； Hereinafter referred to as：STN).

Step 308, after MSC server receives setup message, sending calling to UE carries out (call proceeding) Message, so that the progress of session establishment is returned to UE.

Step 309, MSC server send resource allocation request (assignment request) message to BSS, to ask BSS Resources allocation, and obtain preferential is carried from CM Service Request message in the resource allocation request message Level class information, so that the BSS priority treatments resource allocation request messages.

Step 310, BSS perform channel allocation and return resource allocation order (assignment command) to UE Message.

Step 311, after UE receives resource allocation command messages, activates channel, and sets up channel connection, when channel connects After being successfully established, UE returns resource allocation to BSS and completes (assignment complete) message.

Step 312, after receiving the resource allocation completion message of UE transmissions, the resource distributed before BSS releases, and to MSC server sends resource allocation completion message.

Step 313, as the MSC server in the present embodiment is IMS centralized traffics (IMS Centralized Services；Hereinafter referred to as：ICS) enhanced MSC server, then MSC server can be according to the setup message generation for receiving SIP invites (SIP invite) message to send to SCC AS, and the priority level information for receiving is converted to priority session Priority level information carry in the SIP invite message；Specifically, can be in the resource of the SIP invite message The priority level information of above-mentioned priority session is carried in priority (Resource-Priority) header field.

Step 314, after SCC AS receive the SIP invite message, performs opposite end renewal process.

Step 315, session are transferred to CS domains by ps domain, and ps domain original access tributary is discharged by SCC AS.

In the present embodiment, if the user while priority signing of the priority signing of ps domain from user in CS domains has different Priority level, then the embodiment shown in Fig. 3 of the present invention can be applicable to the calling UE with priority session by ps domain shift To the process in CS domains, wherein the calling UE has been contracted eMLPP business in CS domains.

The present embodiment can realize that MSC server knows priority level information of the session on UE in source ps domain from UE, Session on UE is transferred to into target CS domain by source ps domain, and above-mentioned session is kept in the priority character and priority of source ps domain Class information.

Fig. 4 is the flow chart of the embodiment of the method four shifted between priority session access network of the present invention, as shown in figure 4, should The method shifted between priority session access network can include：

Step 401, the Mobile Switching Center Server of objective circuit switching domain receive internet protocol multimedia subsystem Priority level information of the session on user equipment that network entity sends in source packet switching domain.

Further, in the present embodiment, the Mobile Switching Center Server of objective circuit switching domain receives Internet Protocol Multi-media subsystem network entity send user equipment on session before the priority level information of source packet switching domain, The Mobile Switching Center Server can be with receive user equipment it is determined that the session on the user equipment is in source packet switching domain With the session establishment request message sent after priority character, the session establishment request message carries priority session and indicates The Session Hand-off number of information and the user equipment；Then, Mobile Switching Center Server can be according to the Session Hand-off number Determine that the session establishment request message is session transfer request message of the source packet switching domain to objective circuit switching domain, and according to Priority session configured information to determine and shift above-mentioned session according to priority mode, and following Mobile Switching Center Server can be with The media bearer of core-network side is set up, and internet protocol multimedia is sent to internet protocol multimedia subsystem network entity System domain session transfer request message, the internet protocol multimedia subsystem domain session transfer request message carry above-mentioned preferential Level session configured information.

Specifically, the Mobile Switching Center Server of objective circuit switching domain receives internet protocol multimedia subsystem net Network entity send user equipment on session in the priority level information of source packet switching domain can be：Mobile switching centre Server receive that internet protocol multimedia subsystem network entity sends for above-mentioned internet protocol multimedia subsystem The response message of domain session transfer request message, the session on response message carrying user equipment is in the excellent of source packet switching domain First level class information.

Step 402, Mobile Switching Center Server sends resource allocation to the base station sub-system of objective circuit switching domain please Message is sought, and above-mentioned priority level information is carried in resource allocation request message, so that base station sub-system is preferably the money Session on user equipment is transferred to objective circuit switching domain by source packet switching domain by source allocation request message Resources allocation.

In the present embodiment, the Mobile Switching Center Server of objective circuit switching domain can receive internet protocol multimedia Priority level information of the session on user equipment that Subsystem network entities send in source packet switching domain, it is then mobile to hand over Switching center9's server can send resource allocation request message to the base station sub-system of objective circuit switching domain, and in resource allocation Above-mentioned priority level information is carried in request message, so that base station sub-system is preferably the resource allocation request message distribution money Session on user equipment is transferred to objective circuit switching domain by source packet switching domain by source, such that it is able to realize objective circuit The Mobile Switching Center Server of switching domain knows priority level information of the session on user equipment in source packet switching domain, Session on user equipment is transferred to into objective circuit switching domain by source packet switching domain, and keeps above-mentioned session to hand in source packet Change the priority character and priority level information in domain.

Fig. 5 is the flow chart of the embodiment of the method five shifted between priority session access network of the present invention, used as Fig. 4 of the present invention A kind of specific implementation of illustrated embodiment, this gives including the bimodulus UE of priority session as called UE The process in CS domains is transferred to by ps domain, wherein the called UE has priority signing service in CS domains；Or, the called UE does not have Any business with regard to priority session of signing, but the called UE is to support the UE of priority service.

As shown in figure 5, the method shifted between the priority session access network can include：

Step 501, UE are connected with setting up RR layers to BSS request distribution channels in RACH.

Specifically, UE can be to BSS channel request messages, with to BSS request distribution channels.

Step 502, BSS are that UE distributes dedicated channel and is returned for the response message of channel request message.

Step 503, after UE receives the response message of BSS returns, stops to BSS channel request messages, to core Net MSC server sends CM Service Request message, to ask to set up the connection of CS domains.

Step 504, MSC server receive response message to UE return CM Service Request message, for example：CM Service Accept message (CM Service Accept).

Step 505, UE judge whether the session on the UE is priority session in ps domain, if so, session then on the UE According to priority session is also required in CS domains to be processed, then UE is needed in session establishment request (setup) message to be sent Priority session configured information is carried, for example：Add special prefix (for example before called number STN：" 272 ") representing the session For priority session.

If UE determines that session on the UE is not priority session in ps domain, the UE will be entered by the flow process of general session Row is processed, and be will not be described here.

Step 506, UE send setup message to MSC server, carry priority session and indicate letter in the setup message Breath, for example：Add special prefix (for example before called number STN：" 272 ") come represent the session be priority session.

According to the prefix of STN, step 507, after MSC server receives setup message, judges that the session establishment is asked Needs are processed according to priority mode, and judge transfer of the session establishment request for ps domain to CS domains according to STN values Request, rather than ordinary conversation foundation request, then MSC server does not investigate priority CAMEL-Subscription-Information of the user in CS domains.

Step 508, MSC server set up core-network side media bearer, and sending Session Hand-off to IMS domain entity SCC AS please (invite) message is sought, the invite message carries priority session configured information.

Step 509, MSC server return calling to UE and carry out (call proceeding) message, to return session to UE The progress of foundation.

In the present embodiment, step 508 and step 509 can be with executed in parallel, it is also possible to successively perform, the present embodiment to this not It is construed as limiting.

Step 510, SCC AS perform opposite end renewal process according to invite message.

Specifically, in the present embodiment, SCC AS can preserve priority level information of the session on UE in ps domain, then SCC AS carry the priority level information in the request message of the renewal opposite end for sending, the corresponding response for updating opposite end Priority level information of the session on UE in ps domain can be also included in message.In addition, SCC AS can not also be preserved on UE Priority level information of the session in ps domain, the server of processing priority business are saved on above-mentioned UE in session establishment phase Session ps domain priority level information, therefore in the renewal process of opposite end, the server of the processing priority business exists The session on UE is added in updating the request message of opposite end in the priority level information of ps domain, the corresponding response for updating opposite end Also priority level information of the session on the UE in ps domain is included in message.Specifically, the priority level information can be taken Band is in SIP head domain, such as Resource-Priority header fields.

Step 511, after receiving the response message of opposite end return, SCC AS are returned for invite to MSC server The response message of message, carries priority level information of the session on UE in ps domain in the response message.The response message can Think the Temporary Response message or 2** success response message of 1**.

Step 512, after MSC server receives the response message for invite message, sends resource allocation to BSS Request (assignment request) message, and the priority for receiving is carried from SCC AS in the resource allocation request message Class information, so that the BSS priority treatments resource allocation request messages.

Step 513, BSS perform channel allocation and return resource allocation order (assignment command) to UE Message.

Step 514, after UE receives resource allocation command messages, activates channel, and sets up channel connection, when channel connects After being successfully established, UE returns resource allocation to BSS and completes (assignment complete) message.

Step 515, after receiving the resource allocation completion message of UE transmissions, the resource distributed before BSS releases, and to MSC server sends resource allocation completion message.

Step 516, after MSC server receives resource allocation completion message, sends for turning to IMS domain entity SCCAS Move the confirmation (Acknowledgement of the response message of request；Hereinafter referred to as：ACK) message.

Step 517, after SCC AS receive confirmation message, returns ACK message to opposite end, and session is transferred to CS domains by ps domain, Then former ps domain access tributary is discharged by SCC AS.

In the present embodiment, if the user while priority signing of the priority signing of ps domain from user in CS domains has different Priority level, then embodiment illustrated in fig. 5 of the present invention can be applicable to the calling UE with priority session and be transferred to by ps domain The process in CS domains, the wherein calling UE have been contracted priority service in CS domains.

The present embodiment can realize that the MSC server in target CS domain knows session on UE in source from IMS domain network entity Session on UE is transferred to target CS domain by source ps domain, and keeps above-mentioned session in source PS by the priority level information of ps domain The priority character and priority level information in domain.

Fig. 6 is the flow chart of the embodiment of the method six shifted between priority session access network of the present invention, as shown in fig. 6, should The method shifted between priority session access network can include：

Step 601, the session transfer request message that proxy call conversation control function entity receive user equipment sends should Session transfer request message carries the Session Hand-off mark and priority session configured information of user equipment.

Step 602, proxy call conversation control function entity determine above-mentioned session transfer request according to Session Hand-off mark Message be circuit commutative field to the session transfer request message of packet-switched domain after, it will talk about transfer request message be sent to because Session on user equipment is transferred to packet switch by circuit commutative field by special fidonetFido multi-media subsystem network entity Domain, the session transfer request message carry above-mentioned priority session configured information and Session Hand-off mark.

Further, it will after words transfer request message is sent to internet protocol multimedia subsystem network entity, The proxy call conversation control function entity can also receive being directed to for internet protocol multimedia subsystem network entity transmission The response message of above-mentioned session transfer request message, the session on response message carrying user equipment is in the excellent of circuit commutative field First level class information.

Further, proxy call conversation control function entity receives internet protocol multimedia subsystem network entity and sends out After the response message for session transfer request message for sending, the proxy call conversation control function entity can also be by user Session on equipment is sent to strategy and charging regulation function entity in the priority level information of circuit commutative field, so that tactful The internet protocol multimedia subsystem of the above-mentioned session of transmission is judged with charging regulation function entity according to the priority level information Whether system signaling bear meets the requirement of the priority-level of the session；If do not met, Proxy Call Session Control Function Entity initiates bearing modification process.

Next, proxy call conversation control function entity can be the priority level that above-mentioned session establishment meets the session The media bearer of other requirement.

In the present embodiment, proxy call conversation control function entity can know session on user equipment in circuit switching The priority level information in domain, during the session on user equipment is transferred to packet-switched domain by circuit commutative field, The session on above-mentioned user equipment can be kept in the priority character of circuit commutative field.Such that it is able to realize with priority meeting When the called subscriber equipment of words is shifted between packet-switched domain and circuit commutative field, it is ensured that on the called subscriber equipment, session is excellent First level is constant.

Fig. 7 is the flow chart of the embodiment of the method seven shifted between priority session access network of the present invention, used as Fig. 6 of the present invention A kind of specific implementation of illustrated embodiment, this gives including the UE of priority session as called UE by CS Domain is transferred to the detailed process of ps domain.In the present embodiment, in the priority session that CS domains are set up, there is UE and do not know that the session is Priority session, or the feelings that the known sessions thereon of UE are priority session but the precedence information for not knowing the priority session Condition.

As shown in fig. 7, the method shifted between the priority session access network can include：

Step 701, UE prepare to initiate CS domains to ps domain session transfer request (invite) message, please Session Hand-off is initiated Before seeking message, UE can first judge whether the session on the UE is priority session in former CS domains；If the UE determines the UE On session be priority session in former CS domains, and the priority-level of the session known to the UE on the UE, then the UE can be The priority level information of priority session configured information and the session is carried in invite message to be sent；If the UE Determine that the session on the UE is priority session in former CS domains, but the UE does not know the priority-level of the session on the UE, then should UE carries priority session configured information only in invite message to be sent；If the UE determines session on the UE in original It is priority session that CS domains are not the sessions that priority session or the UE are not can determine that on the UE, then the UE will not be to be sent Invite message in carry priority session configured information or priority level information.

Specifically, priority session configured information and/or priority level information can be by the excellent of invite message (priority) header field or Resource-Priority header fields are weighed first, or in request universal resource identifier (request- Uniform Resource Identifier；Hereinafter referred to as：Request-URI) increase prefix to represent in header field.

In the present embodiment, the request-URI asked in the invite message is the Session Hand-off mark of the UE (Session Transfer Identifier；Hereinafter referred to as：STI).

Step 702, UE is to IMS domain physical agent CSCF (Proxy Call Session Control Function；Hereinafter referred to as：P-CSCF) entity sends invite message.

Step 703, P-CSCF entities judge the invite message for CS to PS's according to the STI in the invite message Session transfer request message, rather than ordinary conversation sets up request message, then P-CSCF entities do not investigate the priority signing of user Information.

In the present embodiment, if UE carries priority indication information and excellent in the invite message that step 701 sends First level class information, then, in step 703, P-CSCF entities can be judging current default of UE according to the priority level information Whether meet the requirement of the priority-level of the session on the UE with transmission IMS signaling bears, if do not met, initiate to carry Modification process, then execution step 704 and its subsequent step again；If met, directly execution step 704 and its subsequently step Suddenly.

Invite message is sent to SCC AS by step 704, P-CSCF entities.

Step 705, SCC AS perform opposite end renewal process according to the invite message.

Step 706, according to the response message that opposite end returns, SCC AS are returned for invite message to P-CSCF entities Response message.

In the present embodiment, SCC AS can preserve priority level information of the session on UE in ps domain, then SCC AS exist When updating opposite end request, the priority level information is carried, also can be comprising on UE in the corresponding response message for updating opposite end Priority level information of the session in ps domain.In addition, SCC AS can not also preserve priority level of the session on UE in ps domain Other information, the server of processing priority business save priority of the session on above-mentioned UE in ps domain in session establishment phase Class information, therefore in the renewal process of opposite end, the server of the processing priority business is in opposite end request message is updated Add the session on UE in the priority level information of ps domain, the corresponding response message for updating opposite end also comprising on the UE Priority level information of the session in ps domain.Specifically, the priority level information can be carried in SIP head domain, for example： In Resource-Priority header fields.

Step 707, after P-CSCF entities receive the response message for invite message, by the session on UE in PS The priority level information in domain is sent to strategy and charging rule functions (Policy and Charging Rules Function；Hereinafter referred to as：PCRF) entity, comes implementation strategy and charging control (Policy and by PCRF entities Charging Control；Hereinafter referred to as：PCC) process.

Step 708, PCRF entities judge the session for priority session, then inspection transmission according to priority level information Service quality (the Quality of Service of the IMS signaling bears of the session；Hereinafter referred to as：QoS) the preferential distribution of parameter With retention parameter (Allocation and Retention Priority；Hereinafter referred to as：ARP) whether value meets the session The requirement of priority-level, changes the ARP values of IMS signaling bears, then execution step 709 and its follow-up step if not meeting Suddenly；If met, directly execution step 709 and its subsequent step.

Step 709, PCRF entities meet session priority rank for the session establishment according to the media information that opposite end returns The media bearer of requirement, then execution step 710 and its subsequent step.

Response message for invite message is returned to UE by step 710, P-CSCF entities.

Step 711, UE are returned for confirmation (ACK) message of the response message of invite message.

Step 712, after SCC AS receive the confirmation message, completes foundation and the opposite end renewal process of ps domain access tributary, And the access tributary in former CS domains is discharged.

In the present embodiment, if the user while priority signing of the priority signing of ps domain from user in CS domains has different Priority level, then embodiment illustrated in fig. 7 of the present invention apply also for the calling UE with priority session and ps domain be transferred to by CS domains Process, the wherein calling UE contracted priority service in ps domain.

The present embodiment can realize that the called UE with priority session is transferred to target ps domain by source CS domains, it is ensured that the quilt Make the priority in source CS domains of session on UE constant.

One of ordinary skill in the art will appreciate that：Realize that all or part of step of said method embodiment can pass through Completing, aforesaid program can be stored in a computer read/write memory medium the related hardware of programmed instruction, the program Upon execution, perform the step of including said method embodiment；And aforesaid storage medium includes：ROM, RAM, magnetic disc or light Disk etc. is various can be with the medium of store program codes.

Fig. 8 is the structural representation of user equipment embodiment of the present invention, and the user equipment in the present embodiment can be realized The flow process of embodiment illustrated in fig. 1 of the present invention, as shown in figure 8, the user equipment can include：

First determining module 81, for when user equipment is shifted from source packet switching domain to objective circuit switching domain, really Session on the fixed user equipment has priority character in source packet switching domain；

First sending module 82, for determining that in the first determining module 81 session on the user equipment is exchanged in source packet After domain has priority character, connection management service request is sent to the Mobile Switching Center Server of objective circuit switching domain Message, the session that the connection management business request information is carried on user equipment are believed in the priority-level of source packet switching domain Breath, so that Mobile Switching Center Server knows that the session on user equipment is believed in the priority-level of source packet switching domain Session on the user equipment is transferred to objective circuit switching domain by source packet switching domain, and keeps above-mentioned session in source by breath The priority character and priority level information of packet-switched domain.

In above-mentioned user equipment, the first determining module 81 is in user equipment from source packet switching domain to objective circuit switching domain During transfer, the session on the user equipment is determined after source packet switching domain has priority character, the first sending module 82 Priority level information of the session on the user equipment in source packet switching domain is sent to into the movement of objective circuit switching domain Switching centre's server, such that it is able to realize that Mobile Switching Center Server knows that the session on user equipment is exchanged in source packet Session on user equipment is transferred to objective circuit switching domain by source packet switching domain, and is protected by the priority level information in domain Hold priority character and priority level information of the above-mentioned session in source packet switching domain.

Fig. 9 is the structural representation of user equipment embodiment of the present invention two, compared with the user equipment shown in Fig. 8, different Part is that the user equipment shown in Fig. 9 can also include：

Modular converter 83, for sending out to the Mobile Switching Center Server of objective circuit switching domain in the first sending module 82 Before sending connection management business request information, when the user equipment is to support the user equipment of eMLPP, by the user equipment Session be converted to the corresponding priority-levels of eMLPP in the priority-level of packet-switched domain；

First receiver module 84, for receiving disappearing for connection management service request for Mobile Switching Center Server transmission What is ceased receives response message, and it is that Mobile Switching Center Server will be from connection management business request information that this receives response message The priority level information of acquisition is authenticated to internet protocol multimedia subsystem, logical in the priority level information certification Later, it is sent to user equipment.

Above-mentioned user equipment can realize that Mobile Switching Center Server knows that the session on user equipment is handed in source packet The priority level information in domain is changed, the session on user equipment is transferred to into objective circuit switching domain by source packet switching domain, and Above-mentioned session is kept in the priority character and priority level information of source packet switching domain.

Figure 10 is the structural representation of Mobile Switching Center Server embodiment of the present invention, the mobile friendship in the present embodiment Switching center9's server can realize the flow process of embodiment illustrated in fig. 2 of the present invention, as shown in Figure 10, the Mobile Switching Center Server Can include：

4th receiver module 1001, for the connection management business request information that receive user equipment sends, the connecting tube Reason business request information be user equipment from source packet switching domain to objective circuit switching domain shift when, determine on user equipment What session was sent after source packet switching domain has priority character, the connection management business request information carries user equipment On above-mentioned session source packet switching domain priority level information；

Session Hand-off module 1002, for the above-mentioned session on user equipment is transferred to target electricity by source packet switching domain Road switching domain, and keep above-mentioned session to believe in the priority character and priority-level of source packet switching domain in Session Hand-off Breath.

Above-mentioned Mobile Switching Center Server can know priority of the session on user equipment in source packet switching domain Class information, it is possible to realize protecting when the session on user equipment is transferred to objective circuit switching domain by source packet switching domain Hold priority character and priority level information of the above-mentioned session in source packet switching domain.

Figure 11 is the structural representation of Mobile Switching Center Server embodiment of the present invention two, with the mobile friendship shown in Figure 10 Switching center9's server is compared, and difference is, in a kind of implementation of the present embodiment, the mobile switching centre shown in Figure 11 Server can also include：

Authentication module 1003, for will obtain in the connection management business request information received from the 4th receiver module 1001 Priority level information be authenticated to IMS；

4th sending module 1004, for passing through afterwards, to send to user equipment in above-mentioned priority level information certification Receive response message for above-mentioned connection management business request information.

In a kind of implementation of the present embodiment, above-mentioned Mobile Switching Center Server can also include：

Priority modular converter 1005, meets the excellent of SIP signallings for above-mentioned priority level information is converted to First level class information；

5th sending module 1006, for the meeting for carrying the priority level information after conversion is sent to IMS network entity Words transfer request message, so that the above-mentioned session on the user equipment is transferred to by source packet switching domain according to priority mode Objective circuit switching domain.

Figure 12 is the structural representation of Mobile Switching Center Server embodiment of the present invention three, the mobile friendship in the present embodiment Switching center9's server can realize the flow process of embodiment illustrated in fig. 4 of the present invention.As shown in figure 12, the Mobile Switching Center Server Can include：

Second receiver module 1201, for receiving the user equipment of internet protocol multimedia subsystem network entity transmission On session source packet switching domain priority level information；

Second sending module 1202, after receiving priority level information in the second receiver module 1201, to mesh The base station sub-system of mark circuit commutative field sends resource allocation request message, and priority is carried in resource allocation request message Class information so that base station sub-system is preferably the resource allocation request message Resources allocation, by the session on user equipment by Source packet switching domain is transferred to objective circuit switching domain.

In above-mentioned Mobile Switching Center Server, the second receiver module 1201 can receive internet protocol multimedia subsystem Then the session on user equipment that system network entity sends second sends mould in the priority level information of source packet switching domain Block 1202 can send resource allocation request message to the base station sub-system of objective circuit switching domain, and disappear in resource allocation request Above-mentioned priority level information is carried in breath, so that base station sub-system is preferably the resource allocation request message Resources allocation, will Session on user equipment is transferred to objective circuit switching domain by source packet switching domain, such that it is able to realize objective circuit switching domain Mobile Switching Center Server know priority level information of the session on user equipment in source packet switching domain, by user Session on equipment is transferred to objective circuit switching domain by source packet switching domain, and keeps above-mentioned session in source packet switching domain Priority character and priority level information.

Figure 13 is the structural representation of Mobile Switching Center Server example IV of the present invention, with the mobile friendship shown in Figure 12 Switching center9's server is compared, and difference is can also to include in the Mobile Switching Center Server shown in Figure 13：Second is true Cover half block 1203 and first sets up module 1204；

In the present embodiment, the second receiver module 1201 can be so that, before priority level information is received, receive user sets For it is determined that the session establishment request that the session on user equipment is sent after source packet switching domain has priority character disappears Breath, the session establishment request message carry the Session Hand-off number of priority session configured information and above-mentioned user equipment；

Second determining module 1203, the Session Hand-off number for being received according to the second receiver module 1201 determine that session is built Vertical request message is session transfer request message of the source packet switching domain to objective circuit switching domain, and according to the second receiver module The 1201 priority session configured informations for receiving are determined according to the above-mentioned session of priority mode transfer；

First sets up module 1204, shift above-mentioned session according to priority mode for determining in the second determining module 1203 Afterwards, set up the media bearer of core-network side；

Further, the second sending module 1202 can be held with setting up module 1204 and setting up the media of core-network side first After load, sending internet protocol multimedia subsystem domain Session Hand-off to internet protocol multimedia subsystem network entity please Message is sought, the internet protocol multimedia subsystem domain session transfer request message carries priority session configured information.

Specifically, the second receiver module 1201 can receive the pin of internet protocol multimedia subsystem network entity transmission Response message to internet protocol multimedia subsystem domain session transfer request message, the response message are carried on user equipment Session source packet switching domain priority level information.

The present embodiment can realize that the Mobile Switching Center Server of objective circuit switching domain knows the meeting on user equipment The priority level information in source packet switching domain is talked about, the session on user equipment is transferred to into target electricity by source packet switching domain Road switching domain, and above-mentioned session is kept in the priority character and priority level information of source packet switching domain.

Figure 14 is the structural representation of proxy call conversation control function entity apparatus embodiments of the present invention, the present embodiment In proxy call conversation control function entity equipment can realize the flow process of embodiment illustrated in fig. 6 of the present invention.As shown in figure 14, The proxy call conversation control function entity equipment can include：

3rd receiver module 1401, for the session transfer request message that receive user equipment sends, the Session Hand-off please Message is asked to carry the Session Hand-off mark and priority session configured information of user equipment；

3rd determining module 1402, the Session Hand-off mark for being received according to the 3rd receiver module 1401 determine that session turns It is session transfer request message of the circuit commutative field to packet-switched domain to move request message；

3rd sending module 1403, for determining that above-mentioned session transfer request message is circuit in the 3rd determining module 1402 The session transfer request message is sent to Internet Protocol to after the session transfer request message of packet-switched domain by switching domain Session on user equipment is transferred to the packet-switched domain by circuit commutative field by multi-media subsystem network entity, should Session transfer request message carries priority session configured information.

Above-mentioned proxy call conversation control function entity equipment can know session on user equipment in circuit commutative field Priority level information, during the session on user equipment is transferred to packet-switched domain by circuit commutative field, can To keep the session on above-mentioned user equipment in the priority character of circuit commutative field.Such that it is able to realize with priority session Called subscriber equipment when shifting between packet-switched domain and circuit commutative field, it is ensured that on the called subscriber equipment, session is preferential Level is constant.

Figure 15 is the structural representation of proxy call conversation control function entity apparatus embodiments of the present invention two, with Figure 14 institutes The proxy call conversation control function entity equipment for showing is compared, and difference is, the agent call session control shown in Figure 15 In functional entity device, the 3rd receiver module 1401 can with the 3rd sending module 1403 by session transfer request message send After internet protocol multimedia subsystem network entity, receive what internet protocol multimedia subsystem network entity sent For the response message of above-mentioned session transfer request message, the session on response message carrying user equipment is in circuit commutative field Priority level information.

Further, the proxy call conversation control function entity equipment shown in Figure 15 can also include：Second sets up mould Block 1404；

After 3rd sending module 1403 can be to receive above-mentioned response message in the 3rd receiver module 1401, by user Session on equipment is sent to strategy and charging regulation function entity in the priority level information of circuit commutative field, so that tactful The internet protocol multimedia subsystem of the above-mentioned session of transmission is judged with charging regulation function entity according to the priority level information Whether system signaling bear meets the requirement of the priority-level of above-mentioned session；

Second sets up module 1404, in the 3rd sending module 1403 by the session on user equipment in circuit commutative field Priority level information be sent to strategy with charging regulation function entity after, be that above-mentioned session establishment meets above-mentioned session The media bearer of the requirement of priority-level.

Above-mentioned proxy call conversation control function entity equipment can realize the called subscriber equipment with priority session When shifting between packet-switched domain and circuit commutative field, it is ensured that on the called subscriber equipment, the priority of session is constant.

It will be appreciated by those skilled in the art that accompanying drawing is the schematic diagram of a preferred embodiment, the module or stream in accompanying drawing Journey is not necessarily implemented necessary to the present invention.

It will be appreciated by those skilled in the art that module in device in embodiment can be carried out point according to embodiment description It is distributed in the device of embodiment, it is also possible to carry out respective change and be disposed other than in one or more devices of the present embodiment.On The module for stating embodiment can merge into a module, it is also possible to be further split into multiple submodule.

Finally it should be noted that：Above example only to illustrate technical scheme, rather than a limitation；Although With reference to the foregoing embodiments the present invention has been described in detail, it will be understood by those within the art that：Which still may be used To modify to the technical scheme described in foregoing embodiments, or equivalent is carried out to which part technical characteristic； And these modification or replace, do not make appropriate technical solution essence depart from various embodiments of the present invention technical scheme spirit and Scope.

Claims

1. a kind of method for shifting between priority session access network, it is characterised in that include：

User equipment is shifted from source packet switching domain to objective circuit switching domain, determines the session on the user equipment described Source packet switching domain has priority character；

The user equipment sends connection management service request to the Mobile Switching Center Server of the objective circuit switching domain Message, the connection management business request information carry the session on the user equipment in the source packet switching domain Priority level information so that the Mobile Switching Center Server by the session on the user equipment by the source Packet-switched domain can keep the session in the preferential of the source packet switching domain when being transferred to the objective circuit switching domain Level characteristics and priority level information；

Wherein, the user equipment sends connection management business to the Mobile Switching Center Server of the objective circuit switching domain After request message, also include：

The user equipment receive that the Mobile Switching Center Server sends for the connection management business request information Receive response message, the response message that receives is that the Mobile Switching Center Server will please from the connection management business The priority level information obtained in seeking message is authenticated to internet protocol multimedia subsystem, in the priority-level After authentification of message passes through, the user equipment is sent to.

2. method according to claim 1, it is characterised in that the connection management business request information also carries the source Transfer configured information of the packet-switched domain to the objective circuit switching domain.

3. method according to claim 1 and 2, it is characterised in that the user equipment is to the objective circuit switching domain Mobile Switching Center Server send connection management business request information before, also include：

When the user equipment is that support is enhanced preferentially seizes the user equipment of business in advance with resource, the user equipment By the session on the user equipment the packet-switched domain priority-level be converted to it is described it is enhanced preferentially and resource The corresponding priority-level of business is seized in advance.

4. a kind of method for shifting between priority session access network, it is characterised in that include：

The connection management business request information that the Mobile Switching Center Server receive user equipment of objective circuit switching domain sends, The connection management business request information is that the user equipment is shifted from source packet switching domain to the objective circuit switching domain When, determine what the session on the user equipment was sent after the source packet switching domain has priority character, the company Adapter reason business request information carries priority-level of the session on the user equipment in the source packet switching domain Information；

The session on the user equipment is transferred to by the Mobile Switching Center Server by the source packet switching domain The objective circuit switching domain, and keep the session special in the priority of the source packet switching domain in the Session Hand-off Property and priority level information；

The connection management service request that the Mobile Switching Center Server receive user equipment of the objective circuit switching domain sends After message, also include：

The Mobile Switching Center Server sends connecing for the connection management business request information to the user equipment By response message, the response message that receives is that the Mobile Switching Center Server will disappear from the connection management service request The priority level information obtained in breath is authenticated to internet protocol multimedia subsystem, in the priority level information After certification passes through, the user equipment is sent to.

5. method according to claim 4, it is characterised in that mobile switching centre's service of the objective circuit switching domain After the connection management business request information that device receive user equipment sends, also include：

The priority level information is converted to and meets conversation initialized protocol signaling biography by the Mobile Switching Center Server Defeated priority level information, and the priority level carried after conversion is sent to internet protocol multimedia subsystem network entity The session transfer request message of other information so that the session on the user equipment according to priority mode by the source Packet-switched domain is transferred to the objective circuit switching domain.

6. a kind of user equipment, it is characterised in that include：

First determining module, for when the user equipment is shifted from source packet switching domain to objective circuit switching domain, it is determined that Session on the user equipment has priority character in the source packet switching domain；

First sending module, the session for determining on the user equipment in first determining module are handed in the source packet Change after domain has priority character, connection management industry is sent to the Mobile Switching Center Server of the objective circuit switching domain Business request message, the session that the connection management business request information is carried on the user equipment are handed in the source packet The priority level information in domain is changed, so that the Mobile Switching Center Server knows the session on the user equipment In the priority level information of the source packet switching domain, the session on the user equipment is exchanged by the source packet Domain can keep when being transferred to the objective circuit switching domain session the source packet switching domain priority character and Priority level information；

First receiver module, for receiving that the Mobile Switching Center Server sends for the connection management service request Message receives response message, and the response message that receives is that the Mobile Switching Center Server will be from the connection management industry The priority level information obtained in business request message is authenticated to internet protocol multimedia subsystem, in the priority After class information certification passes through, the user equipment is sent to.

7. user equipment according to claim 6, it is characterised in that also include：

Modular converter, for sending out to the Mobile Switching Center Server of the objective circuit switching domain in first sending module Before sending connection management business request information, business is seized in advance with resource preferentially when the user equipment is that support is enhanced During user equipment, by the session on the user equipment the packet-switched domain priority-level be converted to it is described enhanced The corresponding priority-level of business is seized with resource in advance preferentially.

8. a kind of Mobile Switching Center Server, it is characterised in that include：

4th receiver module, for the connection management business request information that receive user equipment sends, the connection management business Request message be the user equipment from source packet switching domain to objective circuit switching domain shift when, determine on the user equipment Session send after the source packet switching domain has priority character, the connection management business request information is carried Priority level information of the session on the user equipment in the source packet switching domain；

Session Hand-off module, for the session on the user equipment is transferred to the mesh by the source packet switching domain Mark circuit commutative field, and the session is kept in the Session Hand-off in the priority character of the source packet switching domain and excellent First level class information；

Authentication module, for excellent by what is obtained in the connection management business request information received from the 4th receiver module First level class information is authenticated to internet protocol multimedia subsystem；

4th sending module, for passing through afterwards, to send to the user equipment and be directed in the priority level information certification The connection management business request information receives response message.

9. Mobile Switching Center Server according to claim 8, it is characterised in that also include：

Priority modular converter, meets conversation initialized protocol signalling for the priority level information is converted to Priority level information；

5th sending module, for sending the priority level carried after conversion to internet protocol multimedia subsystem network entity The session transfer request message of other information so that the session on the user equipment according to priority mode by the source Packet-switched domain is transferred to the objective circuit switching domain.