CN101459939B - Domain switching method - Google Patents

Domain switching method Download PDF

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Publication number
CN101459939B
CN101459939B CN2008100891180A CN200810089118A CN101459939B CN 101459939 B CN101459939 B CN 101459939B CN 2008100891180 A CN2008100891180 A CN 2008100891180A CN 200810089118 A CN200810089118 A CN 200810089118A CN 101459939 B CN101459939 B CN 101459939B
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territory
iwf
message
session information
user terminal
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CN101459939A (en
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游世林
郝振武
余志铭
蔡继燕
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Ma Chunpeng
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ZTE Corp
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Abstract

The invention provides a method for switching domains, which comprises the following steps: obtaining domain switching conversation information from a user terminal by the single radio channel voice service continuity control function S-IWF, initiating a voice service continuity switching request to a voice service continuity application server VCC AS according to the switching conversation information by the S-IWF, and switching from an IP multimedia subsystem to a circuit switched domain on a service layer. In the method of the invention, since user real conversation information is stored in switched user terminals, the switching failure problem due to unmatched conversation information in prior art is solved through directly obtaining the conversation information from the user terminals.

Description

A kind of domain switch method
Technical field
The present invention relates to the communications field, more particularly, relate to the domain switch method under a kind of follow-on mobile communications network LTE/SAE (Long term Evolution/System Architecture Evolution, Long Term Evolution/System Architecture Evolution) framework.
Background technology
In order to guarantee that speech business is at circuit (Circuit Switched, be called for short CS) territory and IP (network interconnection agreement, Internet Protocol, be called for short IP) IP multimedia subsystem, IMS (IP Multimedia CoreNetwork Subsystem, abbreviation IMS) continuity between the territory, traditional solution as shown in Figure 1, i.e. the solution of voice business continuity (Voice Call Continuity, be called for short VCC):
Dual-mode user device (User Equipment, be called for short UE) in CS territory and all successfully registrations of IMS network, when UE in the CS territory or IMS network when initiating speech business, all anchor to voice business continuity application server (the Voice Call Continuity Application Server of IMS network, be called for short VCC AS) in, this moment, UE had two numbers that VCC AS is known: general identifications (VCC Domain Transfer URI is switched in the VCC territory, be called for short VDI), be used for expression user conversation is switched to the IMS territory at operation layer from the CS territory; VCC territory Handover Number (VCC Domain Transfer Number is called for short VDN) is used for expression user conversation is switched to the CS territory at operation layer from the IMS territory.When UE in the CS territory speech business has taken place, and prepare when the CS territory switches to the IMS territory, UE uses VDI as called number at the IMS network, VCC AS is initiated a session request, after VCC AS receives this conversation request, discharge the resource in CS territory, related session of building and former session are in the resource in IMS territory, and switching is finished; In like manner, when UE has initiated speech business at the IMS network, when preparation switches to the CS territory from the IMS territory, UE uses VDN as called number in the CS territory, VCC AS is made a call, after VCC AS receives this conversation request, discharge the resource (UE is to the resource between the CSCF) of IMS network, related session of building and former session are in the resource of IMS network, and switching is finished.
In addition, initiating caller at CS is to anchor to VCC AS like this: the function of IN service that VCC AS is integrated, when UE makes a call in the CS territory, at first at CS server network element MSC (Mobile Switch Center, mobile switching centre) triggers an intelligent movable (CustomizedApplications for Mobile network Enhanced Logic, be called for short CAMEL, the user that mobile network strengthens logic uses) to GSM Service Control Function (GSM Service Control Function, be called for short gsmSCF), gsmSCF and VCC AS are mutual, distribute an IMS routing number (IMRN) to give gsmSCF by VCC AS, gsmSCF is transmitted back to MSC by smart message (CAP), MSC utilizes this IMS routing number to be routed to VCC AS by interoffice signaling message then, and calling is anchored to VCC AS.
Described above is that traditional VCC realizes principle, and wherein said bimodulus UE must support Dual Radio (dual-mode dual-standby) simultaneously, promptly simultaneously can carry out audio call in IMS territory and CS territory.
In addition in order to make all business in IMS territory centralized control (ICS), in the IMS territory, increased Another application server I MS circuit domain control function (IMS CS Control Function, be called for short ICCF), it has been positioned at first AS that exhales, second AS is VCC AS, and is positioned at last AS in exhaling eventually, and that the next-door neighbour also is VCC AS, other CS network inserts the IMS territory as just a kind of pipeline, and all business are in the ICCF in IMS territory boot trigger.Exist the path of a control session between the MSC of ICCF and CS network, this session control is to arrive ICCF by attribution server (HSS), and unstructured supplementary service data (UnstructuredSupplementary Service Data is adopted in this session control path, be called for short USSD), existing technology trends is ICCF and these two application servers of VCC AS to be closed establish, and finishes VCC and ICS business jointly.
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 the framework theory of future generation of LTE/SAE, 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 simultaneously, and the mobility between 3GPP connecting system and the non-3GPP connecting system or the like.Simultaneously, LTE/SAE also will be as a kind of access means in IMS territory, support original VCC function, yet owing to very big and LTE/SAE itself has powerful reasons such as mobility management capabilities for the battery of mobile phone energy consumption under the bimodulus pattern, single wireless channel (Single Radio) voice business continuity (Single Radio Voice Call Continuity is proposed, be called for short SRVCC), realize that at present the principle Organization Chart of the scheme of SRVCC is distinguished as shown in Figure 2:
Wherein the respective network elements of SAE has:
E-UTRAN (Evolved UTRAN, the universal land radio access web 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.
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 quartering at this tracing area or this network, is responsible for UE this user is carried out authentication.
SAE GW: the user plane functions entity, the user face data route is handled, and is divided into two kinds of SAE GW of Serving and PDN.Serving SAE GW (SGW, gateway) is mobile anchor point between SAE system and traditional 3GPP system and the mobile anchor point between the E-UTRAN.PDN GW (packet data network gateway): termination is in the downlink data of the UE of idle state, when the downlink data that mails to UE arrives, initiates 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 access network comprises GERAN (the GSM EDGE Radio Access Network of 2G, strengthen the global system for mobile communications Radio Access Network of data rate) and UTRAN (the UniversalTerrestrial Radio Access Network of 3G, universal land radio access web), core net comprises circuit domain network element MSC and grouping domain network element Serving 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 data in home subscriber server (Home Subscriber Server is called for short HSS) management CS territory, packet domain (PS) and IMS territory.
The IMS network comprises:
Core network element CSCF (Call Session Control Function, abbreviation CSCF), MGCF (Media Gateway Control Function, be called for short MGCF) wait core network element, and the VCC AS of realization VCC function.
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, and CS business such as speech business are provided.
The above network that exists for prior art, in order to realize the single wireless channel voice business continuity, increased a single wireless channel voice business continuity controlled function S-IWF, it all links to each other with the CS domain core net MSC of unit and the core network element in PS territory and the MME of LTE/SAE network of 2G/3G, control LTE/SAE network and 2G/3G network switch, S-IWF in addition also the MGCF by IMS territory network link to each other with ICCF/VCC AS, guarantee that all-calls can both anchor among the ICCF/VCCAS in IMS territory, guarantee that the VCC basic function realizes.And interface adopts E interface between the MSC.E interface adopts MAP (Mobile Application Part, be called for short MAP) signaling, switch the inter-office switchover mode that adopts the CS territory between S-IWF and the MSC, adopt E interface between them, if S-IWF and MSC close establish, the interacting message between them is then realized by inner.
Switch in addition to be divided into and switch originating end and switch destination, under the SRVCC framework, switch to the process in CS territory from the LTE/SAE network, switch originating end and comprise LTE/SAE network and single wireless channel voice business continuity controlled function S-IWF, and switch all network elements that destination comprises the CS territory.
Fig. 2 A is a flow process that realizes switching to from the IMS territory CS territory under the SRVCC framework shown in Figure 2, has wherein initiated a session at IMS between UE and the UE-B, and has anchored among the VCC AS, and execution IMS territory switches to the CS territory following steps:
A201, UE sends measurement report to LTE/SAE wireless net member E-UTRAN;
A202, E-UTRAN initiates RELOCATION REQUEST message according to the information in the measurement report to MME;
A203, MME is according to the information of RELOCATION REQUEST message, send RELOCATION REQUEST message forward to S-IWF, described message is carried user's territory switching sign VDN and user's integrated services digital network (ISDN, Integrated Service Digital Network) number, described VDN and ISDN number are according to user's information and the configuration of MME, obtain to HSS;
A204, S-IWF sends MAP to MSC and prepares handoff request message;
A205, MSC send to switch to GERAN/UTRAN and require message, and GERAN/UTRAN requires acknowledgement message to MSC loopback switching;
A206, MSC returns MAP to S-IWF and prepares the handoff request acknowledgement message, and described message is carried Handover Number (HO#), and described Handover Number is distributed by MSC;
A207, S-IWF sends the integrated digital service-user part signaling initial address message of (ISDN User Part is called for short ISUP) according to Handover Number to MSC, and MSC is to the Address Complete Message of S-IWF loopback ISUP;
A208, S-IWF passes through the MGCF in IMS territory and CSCF sends initial address message from ISUP to ICCF/VCC AS, described message is carried VDN and ISDN number, ISDN number and VDN indication VCC AS switch to CS territory at operation layer from the IMS territory with the described user's of correspondence affiliated session, and ICCF/VCC AS sends response message to S-IWF; Or S-IWF directly sends the SIP conversation request message to ICCF/VCC AS, described message is carried VDN or is converted to telecommunications universal resource identifier (tel URI) by user's ISDN number, and ICCF/VCC AS is to S-IWF loopback SIP success message (SIP:200OK);
The SIP conversation request message that S-IWF directly sends out to VCC AS by ISUP initial address message in this step or S-IWF, expression is initiated the voice business continuity handoff request to VCC AS, and request switches to the CS territory at operation layer from the IMS territory.
A209, S-IWF is to MME loopback relocation response message forward;
A210, MME is to E-UTRAN loopback relocation response message;
A211, E-UTRAN is to UE loopback reorientation command messages;
A212, UE send to switch and insert message to target GERAN/UTRAN;
A213 after GERAN/UTRAN detects switching, sends change detection to message to MSC;
A214, MSC notifies the S-IWF user terminal to insert from the CS territory to the processing access signaling message that S-IWF sends MAP;
A215, UE sends handoff completion message to GERAN/UTRAN;
A216, GERAN/UTRAN sends handoff completion message to MSC;
A217, MSC sends MAP_SEND_END_SIGNAL message (MAP sends end signal) message to S-IWF, and described message informing S-IWF user terminal has switched to the CS territory;
A218, MSC is to S-IWF loopback ISUP response message (the ISUP initial address message of corresponding steps A 207);
If S-IWF and MSC close establish, steps A 204, A206, A207, A214, A217 and A218 are then in S-IWF and the inner realization of MSC.
Arrive this, corresponding IMS session successfully switches to from the CS territory from the LTE/SAE network insertion and inserts, this switching comprises by two switchings: one is exactly that steps A 208 switches to CS territory at operation layer from the IMS territory with session, another is exactly the step except steps A 208, is that the access with session switches to the network insertion from CS from the LTE/SAE network insertion.
The IMS business exists " Multi-Subscriber Number " business, promptly a terminal has a plurality of public user identity (PUI), and corresponding public user identity has SIP universal resource identifier (SIP.URI) and telecommunications URI (tel.URI), and telecommunications URI correspondence is exactly the ISDN number in CS territory, therefore sets up may set up with the ISDN number that is different from the CS territory in the process in the SIP session and calls out.In addition in the ICS business, switch for the territory of satisfying IMS business " multimachine ", VCC AS has been the ICS terminal configuration VDN of an acquiescence, this VDN is kept in the terminal, offers first terminal of initiating to switch and carries out the territory and switch and use.If VCC AS finds that two sessions take place same number in addition, then VCC AS is that second session distributes in addition dynamically VDN in conversation procedure, after described terminal is received this dynamic VDN, preserve this dynamic VDN, when this terminal is initiated to switch, use this dynamic VDN notice VCC AS to carry out the territory and switch.And this dynamic VDN follows the end of session to discharge simultaneously in terminal and VCC AS.
There are the following problems for above-mentioned technology: in steps A 208, VCC AS is by the related unique session with the VDN number of calling number, but the ISDN number in CS territory and VDN are the static datas of downloading from HSS in step 203, and may be with SIP URI as calling number during the user terminal initiation session, the ISDN number form in this and CS territory all can not mate, also may be tel URI, but it is inequality with the ISDN number in CS territory, therefore, VCC AS is when correlating sessions, the inequality of Subscriber Number that steps A 208 carries and actual session may be occurred, the correlating sessions failure will be occurred.In addition when the user uses a services of many, the VDN that downloads from HSS is a static configuration, and if terminal to carry out session be a dynamic VDN, when correlating sessions since dynamically VDN and static VDN it fails to match, this also may cause handoff failure.
Summary of the invention
The technical problem to be solved in the present invention provides a kind of domain switch method, solves to have now to switch to the CS territory from the IMS territory, the handoff failure problem that Subscriber Number is different with the actual session number and/or VDN does not match and causes during correlating sessions.
In order to solve the problems of the technologies described above, the invention provides a kind of domain switch method, comprise following steps:
Single wireless channel voice business continuity controlled function S-IWF obtains the territory from user terminal and switches session information;
Described S-IWF initiates the voice business continuity handoff request according to described switching session information to voice business continuity application server VCCAS, carries out the switching from the IMS domain to the circuit domain on the operation layer.
Further, said method also can have following characteristics, and the Subscriber Number that uses when session information is territory Handover Number and/or user terminal session is switched in described territory.
Further, said method also can have following characteristics, described Subscriber Number is Session initiation Protocol universal resource identifier SIP URI, or be telecommunications universal resource identifier tel URI, it perhaps is E.164 number by telecommunications universal resource identifier tel URI conversion, perhaps being SIP URI and tel URI, perhaps is SIPURI and by the E.164 number of telecommunications universal resource identifier tel URI conversion.
Further, said method also can have following characteristics, and single wireless channel voice business continuity controlled function S-IWF is a stand-alone network elements, or closes with mobile switching centre and to establish.
Further, said method also can have following characteristics, and described single wireless channel voice business continuity controlled function S-IWF obtains the territory from user terminal by the following method and switches session information:
Described user terminal switches session information with the territory and sends to wireless system, and described wireless system switches session information with described territory and is forwarded to Mobility Management Entity;
Described Mobility Management Entity switches session information with described territory and sends to described single wireless channel voice business continuity controlled function S-IWF.
Further, said method also can have following characteristics, and described user terminal sends measurement report to wireless system, carries described territory in the described measurement report and switches session information; Described Mobility Management Entity MME sends forward RELOCATION REQUEST message to described single wireless channel voice business continuity controlled function S-IWF, carries described territory in the described message and switches session information.
Further, said method also can have following characteristics, and described single wireless channel voice business continuity controlled function S-IWF obtains the territory from user terminal by the following method and switches session information:
Mobility management unit is initiated territory switching Information Request to described user terminal, switches session information to described user terminal requests territory;
After described user terminal receives that conversation request message is switched in this territory, return the territory to described Mobility Management Entity and switch session information;
Described Mobility Management Entity switches session information with described territory and sends to described single wireless channel voice business continuity controlled function S-IWF.
Further, said method also can have following characteristics, and described single wireless channel voice business continuity controlled function S-IWF obtains the territory from user terminal by the following method and switches session information:
Described single wireless channel voice business continuity controlled function S-IWF is by mobility management unit or directly initiate territory switching Information Request to user terminal, and request domain is switched session information;
Described user terminal is by mobility management unit or directly switch session information to described S-IWF loopback territory.
Further, said method also can have following characteristics, described single wireless channel voice business continuity controlled function S-IWF is before sending MAP preparation handoff request message to mobile switching centre, or afterwards, or simultaneously by mobility management unit or directly to user terminal initiation territory switching Information Request.
Further, said method also can have following characteristics, described single wireless channel voice business continuity controlled function S-IWF and mobile switching centre close when establishing, described single wireless channel voice business continuity controlled function S-IWF send to the global system for mobile communications Radio Access Network GERAN/ universal land radio access web UTRAN that strengthens data rate switch require message before, afterwards or simultaneously by mobility management unit or directly initiate the territory and switch Information Request to user terminal.
Method of the present invention, owing to preserve the true session information of user among the UE that switches, employed calling number during such as session (tel URI or SIP URI), this with set up in session that ICCF/VCC AS is consistent in the process, but not the unique number of user in CS territory or the PS territory.In addition, the UE that switches is also keeping the user and is setting up the dynamic VDN that is distributed to respective session in the conversation procedure by ICCF/VCC AS, this is consistent with ICCF/VCC AS also, therefore it is accurately that the territory handover information that uses UE to preserve is located the session that the user need be switched among the ICCF/VCC AS, has solved may occur number or VDN in the prior art and unmatch the problem that causes handoff failure.
Description of drawings
Fig. 1 is the VCC schematic diagram under the existing IMS;
Fig. 2 is based on existing SRVCC schematic diagram under the SAE network architecture;
Fig. 2 A is for realizing switching to the prior art flow chart that inserts from the CS territory from the LTE/SAE network insertion based on the SRVCC schematic diagram among Fig. 2;
Fig. 3 is that the SRVCC schematic diagram that the present invention is based among Fig. 2 realizes that switching to the territory switching session information that inserts from the CS territory from the LTE/SAE network insertion obtains execution mode one;
Fig. 3 A is for to close the execution mode of establishing with respect to Fig. 3 S-IWF and MSC;
Fig. 4 is that the SRVCC schematic diagram that the present invention is based among Fig. 2 realizes that switching to the territory switching session information that inserts from the CS territory from the LTE/SAE network insertion obtains execution mode two;
Fig. 4 A is for to close the execution mode of establishing with respect to Fig. 4 S-IWF and MSC;
Fig. 5 is that the SRVCC schematic diagram that the present invention is based among Fig. 2 realizes that switching to the territory switching session information that inserts from the CS territory from the LTE/SAE network insertion obtains execution mode three;
Fig. 5 A is for to close the execution mode of establishing with respect to Fig. 5 S-IWF and MSC.
Embodiment
The invention provides and a kind ofly under the SAE and the 2G/3G network architecture, realize switching method for single wireless channel voice service continuity.
Shown in Fig. 3 and Fig. 3 A, for realizing switching to the execution mode one that inserts from the CS territory from the LTE/SAE network insertion based on SRVCC schematic diagram under Fig. 2, the core concept of this execution mode is: UE is after the measurement request of receiving wireless system, send measurement report and carry territory switching session information to wireless system, wireless system carries territory switching session information and sends handoff request by MME to S-IWF, and S-IWF switches session information notice VCC AS according to the territory and carries out the switching of IMS territory to the CS territory at operation layer.This method may further comprise the steps:
301, UE sends measurement report to LTE/SAE wireless net member E-UTRAN, carry the territory in the described measurement report message and switch session information, the Subscriber Number that session information comprises VDN and corresponding session service is switched in described territory, described Subscriber Number can be only to be tel URI form, also can be the E.164 number that is converted to by telURI, also can be SIP URI form, also may comprise tel URI and SIP URI simultaneously, or comprise simultaneously E.164 and SIP URI;
302, E-UTRAN initiates RELOCATION REQUEST message according to the information in the measurement report to MME, and session information is switched in the described territory of carrying of described message;
The Subscriber Number that session information comprises VDN and corresponding session service is switched in described territory, described Subscriber Number can be only to be tel URI form (also can be to be converted to E.164 number by tel URI), it also can be SIP URI form, also may comprise tel URI and SIP URI simultaneously, or comprise simultaneously E.164 and SIP URI
303, MME sends RELOCATION REQUEST message forward according to the information in the RELOCATION REQUEST message to S-IWF, and described message is carried described territory and switched session information;
The Subscriber Number that session information comprises VDN and corresponding session service is switched in described territory, described Subscriber Number can be only to be tel URI form (also can be to be converted to E.164 number by tel URI), it also can be SIP URI form, also may comprise tel URI and SIP URI simultaneously, or comprise simultaneously E.164 and SIP URI, after S-IWF receives forward RELOCATION REQUEST message, preserve the described territory of carrying in this message and switch session information.
S-IWF also can utilize other existing message or self-defined message to obtain territory switching session information from MME.
304, S-IWF sends MAP to MSC and prepares handoff request message;
305, MSC sends to switch to GERAN/UTRAN and requires message, and GERAN/UTRAN requires acknowledgement message to MSC loopback switching;
306, MSC returns MAP to S-IWF and prepares the handoff request acknowledgement message, and described message is carried Handover Number (HO#), and described Handover Number is distributed by MSC;
307, S-IWF sends the integrated digital service-user part signaling initial address message of (ISDN User Part is called for short ISUP) according to Handover Number to MSC, and MSC is to the Address Complete Message of S-IWF loopback ISUP;
308, S-IWF switches session information according to the territory that step 303 is preserved, MGCF by the IMS territory and CSCF send the initial address message of ISUP to ICCF/VCC AS, described message called number carries the VDN that step 303 is preserved, the tel URI that described message calling number is carried the Subscriber Number of being preserved by step 303 is converted to number or number E.164 E.164, described message called number and calling number indicate unique session of user to switch to the CS territory at operation layer from the IMS territory jointly, and ICCF/VCC AS sends response message to S-IWF;
Or S-IWF directly sends the SIP conversation request message to ICCF/VCC AS, described message is carried the tel URI of VDN or Subscriber Number or E.164 number or the SIP URI that is converted to by tel URI, and ICCF/VCC AS is to S-IWF loopback SIP success message (SIP:200 OK);
The SIP conversation request message that S-IWF directly sends out to ICCF/VCC AS by ISUP initial address message in this step or S-IWF, expression is initiated the voice business continuity handoff request to ICCF/VCC AS, and request switches to CS territory at operation layer from the IMS territory with session.
309, the description of the A209-A211 in the scape technology of passing away;
310, the description of the A212-A218 in the scape technology of passing away.
Flow process among Fig. 3 A and Fig. 3 is similar, just MSC and S-IWF is closed and establishes, and comprises following steps:
A301-A303 sees that 301-303 describes, and S-IWF in 303 is replaced with S-IWF/MSC;
A304, S-IWF/MSC send to switch to GERAN/UTRAN and require message, and GERAN/UTRAN requires acknowledgement message to S-IWF/MSC loopback switching;
A305, S-IWF/MSC switches session information according to the territory that step 303 is preserved, MGCF by the IMS territory and CSCF send the initial address message of ISUP to ICCF/VCC AS, described message called number carries tel URI that VDN that steps A 303 preserves and described message calling number carry the Subscriber Number of being preserved by steps A 303 and is converted to E.164 number or number E.164, described message called number and calling number indicate unique session of user to switch to the CS territory from the IMS territory jointly, ICCF/VCC AS sends response message to S-IWF/MSC, or S-IWF/MSC directly sends the SIP conversation request message to ICCF/VCC AS, described message carries VDN or tel URI of the Subscriber Number preserved by steps A 303 (or E.164 number) or SIP URI, and ICCF/VCC AS is to S-IWF/MSC loopback SIP success message (SIP:200 OK);
The SIP conversation request message that S-IWF/MSC directly sends out to ICCF/VCC AS by ISUP initial address message in this step or S-IWF/MSC, expression is initiated the voice business continuity handoff request to ICCF/VCC AS, and request switches to CS territory at operation layer from the IMS territory with session.
A306. the description of the A209-A211 in the scape technology of passing away, and S-IWF among the A209 replaced with S-IWF/MSC;
A307. A212 and A213 in the scape technology of passing away, and the description of A215 and A216, and the MSC in each step replaced with S-IWF/MSC.
Shown in Fig. 4 and Fig. 4 A, for realize switching to from CS territory access execution mode two based on SRVCC schematic diagram under Fig. 2 from the LTE/SAE network insertion, the core concept of this execution mode is: the MME of SAE network directly initiates a territory and switches Information Request, UE is to MME back response message then, carry the territory in the response message and switch session information, MME carries the territory and switches session information sending forward RELOCATION REQUEST message to S-IWF, perhaps MME switches session information according to other message between MME and the S-IWF with the territory and sends to S-IWF, and last S-IWF switches session information notice ICCF/VCC AS according to the territory and carries out the switching of IMS territory to the CS territory at operation layer.This method may further comprise the steps:
401, UE sends measurement report to LTE/SAE wireless net member E-UTRAN;
402.E-UTRAN, initiate RELOCATION REQUEST message to MME according to the information in the measurement report;
403.MME, judge this switching and need switch to the CS territory according to step 402 RELOCATION REQUEST message and beared information, then to initiate the territory and switch Information Request to UE, described message is carried needs to obtain the content that session information is switched in the territory;
404.UE switch the Information Request response message to MME loopback territory, described message is according to the content of the described message request of step 403, session information is switched in the territory of carrying response, it is the Subscriber Number of VDN and corresponding session service, described Subscriber Number can be only to be tel URI form (also can be to be converted to E.164 number by tel URI), also can be SIP URI form, also may comprise tel URI and SIP URI simultaneously, or comprise simultaneously E.164 and SIP URI;
405.MME according to the information of step 402 RELOCATION REQUEST message, send RELOCATION REQUEST message forward to S-IWF, described message is carried the territory and is switched session information; It is to obtain in the territory switching Information Request response message of MME from step 404 that session information is switched in described territory;
The Subscriber Number that session information comprises VDN and corresponding session service is switched in described territory, described Subscriber Number can be only to be tel URI form (also can be to be converted to E.164 number by tel URI), it also can be SIP URI form, also may comprise tel URI and SIP URI simultaneously, or comprise simultaneously E.164 and SIP URI; Described S-IWF preserves the territory of carrying in this message and switches session information.
S-IWF also can utilize other message to obtain territory switching session information from MME.
Prepare handoff request message 406.S-IWF send MAP to MSC;
Require message 407.MSC send switching to GERAN/UTRAN, GERAN/UTRAN requires acknowledgement message to MSC loopback switching;
Prepare the handoff request acknowledgement message 408.MSC return MAP to S-IWF, described message is carried Handover Number (HO#), and described Handover Number is distributed by MSC;
409.S-IWF send the integrated digital service-user part signaling initial address message of (ISDN User Part is called for short ISUP) according to Handover Number to MSC, MSC is to the Address Complete Message of S-IWF loopback ISUP;
410.S-IWF switch session information according to the territory that step 405 is preserved, MGCF by the IMS territory and CSCF send the initial address message of ISUP to ICCF/VCC AS, described message called number carries tel URI that VDN that step 405 preserves and described message calling number carry the Subscriber Number of being preserved by step 405 and is converted to E.164 number or number E.164, described message called number and calling number indicate unique session of user to switch to the CS territory from the IMS territory jointly, ICCF/VCC AS sends response message to S-IWF, or S-IWF directly sends the SIP conversation request message to ICCF/VCC AS, described message carries VDN or tel URI of the Subscriber Number preserved by step 405 (perhaps E.164 number) or SIP URI, and ICCF/VCC AS is to S-IWF loopback SIP success message (SIP:200 OK);
The SIP conversation request message that S-IWF directly sends out to ICCF/VCC AS by ISUP initial address message in this step or S-IWF, expression is initiated the voice business continuity handoff request to ICCF/VCC AS, and request switches to CS territory at operation layer from the IMS territory with session.
The description of A209-A211 411. pass away in the scape technology;
The description of A212-A218 412. pass away in the scape technology;
Fig. 4 A and Fig. 4 are similar, but S-IWF and MSC close and establish, and comprise following steps:
A401-A405. see that 401-405 describes, and S-IWF in 405 is replaced with S-IWF/MSC;
A406.S-IWF/MSC sends to switch to GERAN/UTRAN and requires message, and GERAN/UTRAN requires acknowledgement message to S-IWF/MSC loopback switching;
A407.S-IWF/MSC switches session information according to the territory that steps A 405 is preserved, MGCF by the IMS territory and CSCF send the initial address message of ISUP to ICCF/VCC AS, described message called number carries tel URI that VDN that steps A 405 preserves and described message calling number carry the Subscriber Number of being preserved by steps A 405 and is converted to E.164 number or number E.164, described message called number and calling number indicate unique session of user to switch to the CS territory from the IMS territory jointly, ICCF/VCC AS sends response message to S-IWF/MSC, or S-IWF/MSC directly sends the SIP conversation request message to VCCAS, described message carries VDN or tel URI of the Subscriber Number preserved by steps A 405 (or E.164 number) or SIP URI, and ICCF/VCC AS is to S-IWF/MSC loopback SIP success message (SIP:200 OK);
The SIP conversation request message that S-IWF/MSC directly sends out to ICCF/VCC AS by ISUP initial address message in this step or S-IWF/MSC, expression is initiated the voice business continuity handoff request to ICCF/VCC AS, and request switches to CS territory at operation layer from the IMS territory with session.
A408. the description of the A209-A211 in the scape technology of passing away, and S-IWF among the A209 replaced with S-IWF/MSC;
A409. A212 and A213 in the scape technology of passing away, and the description of A215 and A216, and the MSC in each step replaced with S-IWF/MSC;
Shown in Fig. 5 and Fig. 5 A, for realize switching to from CS territory access execution mode three based on SRVCC schematic diagram under Fig. 2 from the LTE/SAE network insertion, the core concept of this execution mode is: S-IWF directly initiates a territory and switches Information Request, UE is to S-IWF back response message then, carry the territory in the response message and switch session information, last S-IWF switches session information notice ICCF/VCC AS according to the territory and carries out the switching of IMS territory to the CS territory at operation layer.This method may further comprise the steps:
501, UE sends measurement report to LTE/SAE wireless net member E-UTRAN;
502, E-UTRAN initiates RELOCATION REQUEST message according to the information in the measurement report to MME;
503, MME sends RELOCATION REQUEST message forward according to the information of RELOCATION REQUEST message to S-IWF;
504, S-IWF is by MME or directly initiate territory switching Information Request to UE, and described message is carried needs to obtain the content that session information is switched in the territory;
505, UE switches the Information Request response message to S-IWF loopback territory, described message is according to the content of the described message request of step 504, session information is switched in the territory of carrying response, be the Subscriber Number of VDN and corresponding session service, described Subscriber Number can be only to be tel URI form (or E.164 number), also can be SIP URI form, also may two kinds of forms all have, S-IWF preserves this territory and switches session information;
Prepare handoff request message 506.S-IWF send MAP to MSC;
Require message 507.MSC send switching to GERAN/UTRAN, GERAN/UTRAN requires acknowledgement message to MSC loopback switching;
Prepare the handoff request acknowledgement message 508.MSC return MAP to S-IWF, described message is carried Handover Number (HO#), and described Handover Number is distributed by MSC;
509.S-IWF send the integrated digital service-user part signaling initial address message of (ISDN User Part is called for short ISUP) according to Handover Number to MSC, MSC is to the Address Complete Message of S-IWF loopback ISUP;
S-IWF can concurrently carry out (promptly carrying out simultaneously) step 504-505 and step 506-509, also can successively carry out, if but step 504-505 carries out in the back, and S-IWF can not preserve the territory and switch session information.
510.S-IWF switch session information according to the territory that step 505 is preserved, MGCF by the IMS territory and CSCF send the initial address message of ISUP to ICCF/VCC AS, described message called number carries tel URI that VDN that step 505 preserves and described message calling number carry the Subscriber Number of being preserved by step 505 and is converted to E.164 number or number E.164, described message called number and calling number indicate unique session of user to switch to the CS territory from the IMS territory jointly, ICCF/VCC AS sends response message to S-IWF, or S-IWF directly sends the SIP conversation request message to VCC AS, described message carries VDN or tel URI of the Subscriber Number preserved by step 505 (or E.164 number) or SIP URI, and VCC AS is to S-IWF loopback SIP success message (SIP:200 OK);
The SIP conversation request message that S-IWF directly sends out to ICCF/VCC AS by ISUP initial address message in this step or S-IWF, expression is initiated the voice business continuity handoff request to ICCF/VCC AS, and request switches to CS territory at operation layer from the IMS territory with session.
The description of A209-A211 511. pass away in the scape technology;
The description of A212-A218 512. pass away in the scape technology;
Fig. 5 A and Fig. 5 are similar, but MSC and S-IWF close and establish, and following steps are arranged:
A501-A505. see that 501-505 describes, and S-IWF among the 504-505 is replaced with S-IWF/MSC;
A506.S-IWF/MSC sends to switch to GERAN/UTRAN and requires message, and GERAN/UTRAN requires acknowledgement message to S-IWF/MSC loopback switching;
S-IWF can concurrently carry out (promptly carrying out simultaneously) steps A 504-A505 and steps A 506, also can successively carry out, if but steps A 504-A505 carries out in steps A 506 back, and S-IWF can not preserve the territory and switch session information.
A507.S-IWF/MSC switches session information according to the territory that steps A 505 is preserved, MGCF by the IMS territory and CSCF send the initial address message of ISUP to ICCF/VCC AS, described message called number carries tel URI that VDN that steps A 505 preserves and described message calling number carry the Subscriber Number of being preserved by steps A 505 and is converted to E.164 number or number E.164, described message called number and calling number indicate unique session of user to switch to the CS territory from the IMS territory jointly, ICCF/VCC AS sends response message to S-IWF/MSC, or S-IWF/MSC directly sends the SIP conversation request message to VCCAS, described message carries VDN or tel URI of the Subscriber Number preserved by steps A 505 (or E.164 number) or SIP URI, and VCC AS is to S-IWF/MSC loopback SIP success message (SIP:200 OK);
The SIP conversation request message that S-IWF/MSC directly sends out to ICCF/VCC AS by ISUP initial address message in this step or S-IWF/MSC, expression is initiated the voice business continuity handoff request to ICCFVCC AS, and request switches to CS territory at operation layer from the IMS territory with session.
A508. the description of the A209-A211 in the scape technology of passing away, and S-IWF among the A209 replaced with S-IWF/MSC;
A509. A212 and A213 in the scape technology of passing away, and the description of A215 and A216, and the MSC in each step replaced with S-IWF/MSC;
By measurement report session information is switched in the territory by above step UE and send to S-IWF, or S-IWF or S-IWF/MSC directly obtain the territory to UE and switch session information, and S-IWF switches session information indication ICCF/VCC AS according to the territory and carries out the IMS territory at operation layer and switch to the CS territory.
In invention, owing to preserve the true session information of user among the UE that switches, employed calling number during such as session (tel URI or SIP URI), this with set up in session that ICCF/VCC AS is consistent in the process, but not the unique number of user in CS territory or the PS territory.In addition, the UE that switches is also keeping the user and is setting up the dynamic VDN that is distributed to respective session in the conversation procedure by ICCF/VCC AS, this is consistent with ICCF/VCC AS also, therefore it is accurately that the territory handover information that uses UE to preserve is located the session that the user need be switched among the ICCF/VCC AS, has solved in the prior art because the handoff failure problem that calling number or VDN do not match and cause.
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 (7)

1. a domain switch method is characterized in that, comprises following steps:
Single wireless channel voice business continuity controlled function S-IWF obtains the territory from user terminal and switches session information, specifically comprises:
Described user terminal switches session information with the territory and sends to wireless system, and described wireless system switches session information with described territory and is forwarded to Mobility Management Entity;
Described Mobility Management Entity switches session information with described territory and sends to described single wireless channel voice business continuity controlled function S-IWF;
Perhaps,
Mobility Management Entity is initiated the territory to described user terminal and is switched Information Request, switches session information to described user terminal requests territory;
After described user terminal receives that conversation request message is switched in this territory, return the territory to described Mobility Management Entity and switch session information;
Described Mobility Management Entity switches session information with described territory and sends to described single wireless channel voice business continuity controlled function S-IWF;
Perhaps,
Described single wireless channel voice business continuity controlled function S-IWF is by Mobility Management Entity or directly initiate territory switching Information Request to user terminal, and request domain is switched session information;
Described user terminal is by Mobility Management Entity or directly switch session information to described S-IWF loopback territory;
Described S-IWF initiates the voice business continuity handoff request according to described switching session information to voice business continuity application server VCCAS, carries out the switching from the IMS domain to the circuit domain on the operation layer.
2. the method for claim 1 is characterized in that, the Subscriber Number that uses when session information is territory Handover Number and/or user terminal session is switched in described territory.
3. method as claimed in claim 2, it is characterized in that, described Subscriber Number is Session initiation Protocol universal resource identifier SIP URI, or be telecommunications universal resource identifier tel URI, it perhaps is E.164 number by telecommunications universal resource identifier tel URI conversion, perhaps being SIP URI and tel URI, perhaps is SIPURI and by the E.164 number of telecommunications universal resource identifier tel URI conversion.
4. the method for claim 1 is characterized in that, single wireless channel voice business continuity controlled function S-IWF is a stand-alone network elements, or closes with mobile switching centre and to establish.
5. as claim 1 or 2 or 3 or 4 described methods, it is characterized in that described user terminal sends measurement report to wireless system, carry described territory in the described measurement report and switch session information; Described Mobility Management Entity MME sends forward RELOCATION REQUEST message to described single wireless channel voice business continuity controlled function S-IWF, carries described territory in the described message and switches session information.
6. as claim 1 or 2 or 3 or 4 described methods, it is characterized in that, described single wireless channel voice business continuity controlled function S-IWF is before sending MAP preparation handoff request message to mobile switching centre, or afterwards, or simultaneously by Mobility Management Entity or directly to user terminal initiation territory switching Information Request.
7. as claim 1 or 2 or 3 or 4 described methods, it is characterized in that, described single wireless channel voice business continuity controlled function S-IWF and mobile switching centre close when establishing, described single wireless channel voice business continuity controlled function S-IWF send to the global system for mobile communications Radio Access Network GERAN/ universal land radio access web UTRAN that strengthens data rate switch require message before, afterwards or simultaneously by Mobility Management Entity or directly initiate the territory and switch Information Request to user terminal.
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CN106792941B (en) * 2016-12-20 2019-12-13 北京小米移动软件有限公司 Method and device for processing single radio frequency voice call continuity switching
CN108738089B (en) * 2017-04-24 2023-04-14 中兴通讯股份有限公司 Method and device for interoffice transmission of subscriber number

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