CN101848516B - Method and system for realizing CS-service switching in EPS network access mode - Google Patents
Method and system for realizing CS-service switching in EPS network access mode Download PDFInfo
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- H04W36/00—Hand-off or reselection arrangements
- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0011—Control or signalling for completing the hand-off for data sessions of end-to-end connection
- H04W36/0022—Control or signalling for completing the hand-off for data sessions of end-to-end connection for transferring data sessions between adjacent core network technologies
Abstract
The invention provides a method for realizing CS-service switching in an EPS network access mode and a system for implementing the method. An MME (mobile management entity) in the method-based system is provided with a neighboring cell index and a MSC address number list corresponding to the neighboring cell index. The method comprises the following steps that: a base station sends a switching request to the MME (mobile management entity), wherein the switching request carries a target cell index; the MME receives the switching request, and sends the switching request to an interworking gateway (IWF); the IWF receives the switching request, and acquires a MSC (target mobile switching center) address number corresponding to the target cell index from the MME; and the IWF initiates the switching to the target MSC according to the acquired target MSC address number. The method and the system of the invention can ensure the successful switching of the CS services in the EPS network access mode.
Description
Technical field
The present invention relates to the communications field, relate in particular to a kind of method and system that CS business is switched that realize under EPS network access mode.
Background technology
In order to keep 3-G (Generation Three mobile communication system) standardization project (3rd Generation PartnershipProject, referred to as 3GPP) in the strong competitiveness of moving communicating field, 3GPP is just endeavouring research at present to packet switched core network (Packet Switched Core, referred to as PS Core) and global system for mobile communications wireless access network (Universal Mobile Telecommunication System RadioAccess Network, referred to as UTRAN) evolution, object is that the PS Core (being called for short EPC) that makes evolution can provide higher transmission rate, shorter transmission delay, and support E-UTRAN (EvolvedUTRAN, the UTRAN of evolution), GERAN (GSM EDGE radio access network, GSM EDGE wireless access network, wherein GSM is the abbreviation of Global System for Mobilecommunications, it is global system for mobile communications, EDGE is the abbreviation of Enhanced Data Ratefor GSM Evolution, be enhanced data rates for gsm evolution technology), UTRAN, WLAN (Wireless Local Area Network, WLAN (wireless local area network)) mobile management and between the access network of other non-3GPP.The mobile communication system of this evolution is called as the grouping domain system (Evolved Packet System, referred to as EPS) of evolution.
The terminal that Fig. 1 shows prior art realizes the network architecture diagram of CS business under EPS network access mode, for being described as follows of each entity in Fig. 1:
Subscriber equipment (User Equipment is called for short UE) 101.
E-UTRAN 102: the wireless access network of evolution, can provide higher up-downgoing speed, lower transmission delay and more reliably wireless transmission.The network element comprising in E-UTRAN is eNodeB (Evolved NodeB), for the access of terminal provides Radio Resource.
Gateway (Serving Gateway is called for short S-GW) 104, is a user entity, is responsible for user face data route processing.
Packet data network gateway (Packet Data Network Gateway is called for short PDN GW or P-GW) 105, is responsible for the gateway function that UE accesses PDN (Packet Data Network, Packet Data Network).P-GW and S-GW may close and be located in a physical entity.
Mobility Management Entity (Mobility Management Entity, be called for short MME) 103, it is a chain of command entity, the server of interim storage user data, be in charge of and store UE context (such as UE/ user ID, mobility management states, user security parameters etc.), for user assignment temporary mark, when quartering at this tracing area or this network, is responsible for UE this user to carry out authentication.
Mobile switching centre's (Mobile Switching Center is called for short MSC)/VLR Visitor Location Register (Visitor Location Register is called for short VLR) 108.Conventionally the unit that MSC and these two logics of VLR are separated when reality realizes and arranges net is one and closes the physical node of establishing.This MSC/VLR can be also at R4 stage and new functional entity MSC Server afterwards etc., and unification in the present invention represents with MSC/VLR.
Interconnected network element (Interworking Function, be called for short IWF) 106, this network element is modeled as BSC/RNC to MSC/VLR, A/IU-CS interface is provided, completing the IP signaling message transformation receiving from UE is that A/IU-CS interface message sends to MSC/VLR, and rightabout conversion and transmission.After UE access EPS network, by being carried between IP signaling passage on EPS network and IWF and MSC/VLR, register alternately, position is upgraded and the reciprocal process such as audio call, thereby complete, carry and the process of establishing of call setup.When UE need to be switched to UMTS/GSM network from EPS network, when MME receives handover request, to speech business, MME sends handover request message need to the current IWF of UE, thereby the MSC/VLR that calls out also to current control to handover request message conversion by this IWF sends handover request message, so the MME at the current place of UE needs to know the IWF at the current place of UE.
"Policy and Charging Rules Function (Policy Charging Rule Function is called for short PCRF) 107.
Home subscriber server (Home Subscriber Server is called for short HSS) 108.
When UE is during in GSM/UMTS network insertion, user's basic speech business and the supplementary service based on speech business etc. are by circuit switching (Circuit Switched, abbreviation CS) territory (being hereinafter referred to as circuit domain) provides, MSC/VLR in Fig. 1 belongs to CS domain network element, user by CS territory can with Home Network in or the user of other network (such as fixed-line telephone network, other mobile network) carry out the CS business such as audio call.
EPS system itself can not provide and control the CS business such as audio call, Internet protocol (Internet Protocol can only be provided, abbreviation IP) carrying of data, the thinking that in prior art, a kind of UE realizes the CS business such as voice under EPS access way is realized by circuit domain control exactly, after UE access EPS network, the mutual signaling of transmitting between UE and MSC/VLR by the IP signaling passage being carried on EPS network is carried out the reciprocal processes such as position renewal and call signaling, by the IP user's face passage being carried on EPS network, transmits audio medium stream.IWF in Fig. 1 can be the network element with any version of corresponding function, and the unified IWF of use represents in the present invention.
Fig. 2 be user in calling procedure, by EPS access network, be switched to the schematic diagram of CS territory network.Subscriber equipment (UE) 201 is original by EPS access network, be connected to MSC 208, its carrying is as bearer path before switching in Fig. 2, after due to EPS network wireless mass change, or due to the movement of UE, E-UTRAN, according to user's current wireless quality report, determines to be switched to CS territory, after switching completes, the carrying of the language of UE is as the bearer path after switching in Fig. 2.Wherein UTRAN 203 is global system for mobile communications wireless access network, and it comprises CS territory network base station and base station management system, and Target MSC 209 is for switching the mobile switch server of object service area.
Fig. 3 illustrates existing voice business and from EPS access network, is switched to the technology signaling process of CS territory access network.
301, UE sends wireless signal measurement report to E-UTRAN;
302, E-UTRAN, according to measurement report, determines to initiate to switch, and E-UTRAN sends and switches requirement to MME, and message comprises switches object community;
303, MME receives switching requirement, according to object community, selects IWF, to IWF, forwards and switches requirement;
304, IWF receives that forward direction switches after requirement, and simulation RNC, becomes A/IU-CS interface message message transformation, to traditional C/S territory MSC, sends and switches requirement, carries object cell information in message;
305-306, MSC receive switching requirement, according to switching destination locations district in requirement, in the local exchange community of own static configuration or in office's cell list, mate object RNC or MSC, that in this example, select is Target MSC, to object Target MSC, send handover request, if object Target MSC accepts switching, reserved Radio Resource, and distributing land circuit, the backward MSC of success returns to handover acknowledge message;
307, MSC sends switching command to IWF after receiving handover acknowledge message, and notice UE switches;
308, IWF receives after switching command, and the forward direction switching that A/IU-CS interface message content is changed between IWF and MME requires response message, sends to MME;
309～310, MME receives that handover acknowledge message switches to E-UTRAN notice UE;
311, UE carries out change detection and switching to Target MSC, and switching completes, and Target MSC returns and switched to MSC;
312, MSC notifies IWF to remove resource after receiving handoff completion message, sends clear command;
313, IWF receives clear command, sends handoff completion message, and remove IWF resource to MME, and MME receives and switched, and removes EPS Internet resources;
314, IWF resource has been removed, and to MSC, sends and has removed message;
315, after IWF sends and has removed, release signaling carrying.
According to process analysis described above, prior art, when user roams, under special circumstances, does not support to realize CS business under EPS network access mode as visited place, and IWF may be distributed in home network as shown in Figure 4.IWF and MSC are all at home network, and at this time, as 305 steps, MSC receives that it is community, visited place that switching requires the destination locations community in message, and ownership place MSCDui Gai community may be unknowable, cannot find object equipment, causes handoff failure.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of method and system that CS business is switched that realize under EPS network access mode, to guarantee to realize the successful switch of CS business under EPS network access mode.
For solving the problems of the technologies described above, the invention provides a kind of method that circuit domain business switches that realizes under the grouping domain system network access mode of evolution, realize the method based on system in Mobility Management Entity MME dispose adjacent cell index and corresponding MSC address digit list thereof, the method comprises:
Base station sends handover request to Mobility Management Entity MME, carries object cell index in described handover request;
Described MME receives described handover request, and sends handover request to Interworking GateWay IWF;
Described IWF receives described handover request, and from described MME, to obtain object mobile switching centre corresponding to object cell index be object MSC address digit;
Described IWF initiates to switch to object MSC according to the object MSC address digit obtaining.
Further, described IWF obtain the mode of described object MSC address digit be following any:
Described MME sends handover request message to described IWF, wherein carries described handover request and described object MSC address digit, and described IWF receives described handover request message and obtains described object MSC address digit;
Described IWF sends and asks for after the request of object MSC address digit to described MME, by described MME, returns to described object MSC address digit, and described IWF obtains described object MSC address digit.
Further, described IWF initiates to switch to described object MSC by following any mode:
Described IWF allocating cell list, described list is consistent with the cell list in the MSC of source, and described IWF receives and switches after message judge whether object community is list Zhong community, if so, by source MSC, to object MSC, initiates to switch; Otherwise from described MME, obtain described object MSC address digit, and directly to described object MSC, send handover request by intercarrier interface;
Described IWF sends handover request to source MSC, wherein carries described object MSC address digit; Described source MSC sends handover request according to described object MSC address digit to described object MSC;
Described IWF directly sends handover request by intercarrier interface to described object MSC according to described MSC address digit.
For solving above technical problem, the invention provides a kind of system that circuit domain business switches that realizes under the grouping domain system network access mode of evolution, this system comprises that base station, Mobility Management Entity MME, Interworking GateWay IWFJi object mobile switching centre are object MSC, wherein
Described base station, for sending handover request to described MME, wherein carries Target cell index;
Described MME, for preserving adjacent cell index and corresponding MSC address digit list thereof, the handover request also sending for receiving described base station, and the object MSC address digit corresponding according to the Target cell search index in handover request, also for sending handover request and described object MSC address digit to described IWF;
Described IWF, the handover request and the described object MSC address digit that for receiving described IWF, forward; Also for initiating to switch to described object MSC;
Described object MSC, for carrying out handover operation.
Further, described MME sends described handover request and described object MSC address digit by handover request message to described IWF.
Further, described IWF receives after handover request, also for send the request of asking for object MSC address digit to described MME; Described MME sends object MSC address digit by response message to IWF.
Further, described system also comprises source MSC, for preserving the MSC list of community and coupling thereof, and the handover request also sending for receiving IWF, according to the Target cell in handover request, inquire about corresponding object MSC, and send handover request to described object MSC;
Described IWF is also for preserving cell list, and described list is consistent with the list in the MSC of source; Described IWF receives after handover request, also for judging whether object community is list Zhong community, if, described IWF is also for sending handover request to source MSC, otherwise, described IWF, also for utilizing the described object MSC address digit obtaining, directly sends handover request to described object MSC by intercarrier interface.
Further, described IWF directly sends handover request to described object MSC according to described target MSC address digit by intercarrier interface.
Further, described IWF also comprises source MSC, when described IWF initiates to switch to object MSC, for sending handover request to source MSC, wherein carries object MSC address digit; Described source MSC is for sending handover request according to described object MSC address digit to described object MSC.
Further, described IWF comprises base station functions and handoff functionality module, the handover request that described base station functions sends for receiving described MME, also for to described handoff functionality module forwards handover request, wherein carry media and set up information and described object MSC address digit, also for set up and described handoff functionality module between carrying; Described handoff functionality module is used for receiving described handover request, and the carrying between foundation and described base station functions module, also for initiating to switch to described object MSC; Described object MSC completes after switching, also for sending handover acknowledge to described handoff functionality module; Described handoff functionality module is also for receiving described handover acknowledge and being transmitted to described base station functions module, described base station functions module is used for receiving described handover acknowledge, also for connecting the carrying between source MSC and described handoff functionality module, and the voice bearer that is connected with EPS network of removing.
Compared to prior art, the inventive method and system by configuring adjacent cell index and corresponding MSC address digit list thereof in MME, IWF obtains object MSC address digit from MME, according to object MSC address digit, to object MSC, switch, when so just having overcome the switching that realizes CS business under EPS network access mode, because MSC is the unknowable and problem of handoff failure to object community, thereby guarantee to realize successful switch.
Accompanying drawing explanation
Fig. 1 is that the terminal of prior art realizes the network architecture diagram of CS business under EPS network access mode.
Fig. 2 be user in calling procedure, by EPS access network, be switched to the schematic diagram of CS territory network.
Fig. 3 is that existing voice business is switched to the technology signaling process of CS territory access network from EPS access network.
Fig. 4 is that IWF may be distributed in home network network diagram.
Fig. 5 is that the present invention realizes the system framework schematic diagram that CS business is switched.
Fig. 6 is the first embodiment that the present invention realizes the method for CS business switching, is initiated the signaling process switching by IWF.
Fig. 7 the present invention realizes the signaling process schematic diagram of the second embodiment of the method that CS business switches, and IWF provides object MSC address digit to initiate to switch to MSC，You source, source MSC.
Fig. 8 is another schematic diagram that the present invention realizes the system framework of CS business switching, and wherein IWF is for comprising two standalone feature entities.
Fig. 9 is the signaling process schematic diagram that the present invention based on Fig. 8 realizes the 3rd embodiment of the method that CS business switches.
Figure 10 is that the present invention realizes the schematic flow sheet that CS business is switched.
Embodiment
Figure 10 is the schematic flow sheet that the present invention realizes the method for CS business switching under EPS network access mode, realize the method based on system in Mobility Management Entity MME static configuration in local data base have adjacent cell index and corresponding MSC address digit list thereof, the method comprises:
Step 1001: base station sends handover request to Mobility Management Entity MME, carries object cell index in described handover request;
Step 1002: described MME receives handover request, and forward handover request to Interworking GateWay IWF;
Step 1003: described IWF receives described handover request, and from described MME, to obtain object mobile switching centre corresponding to object cell index be the address digit of object MSC;
Object MSC address digit is that MME checks out in list according to the object cell index in handover request.
The mode that described IWF obtains described object MSC address digit be following any:
Described MME sends handover request message to described IWF, wherein carries described handover request and described object MSC address digit;
To described MME, send and ask for after the request of object MSC address digit, by described MME, return to described object MSC address digit.
Step 1004: described IWF initiates to switch to object MSC according to the object MSC address digit obtaining.
Described IWF initiates to switch to described object MSC by following any mode:
Mode one: described IWF allocating cell list, described list is consistent with the cell list (comprising local exchange cell list and an adjacency office cell list) in the MSC of source, described IWF receives and switches after message, judge whether object community is list Zhong community, if so, by source MSC, to object MSC, initiate to switch; Otherwise from described MME, obtain described object MSC address digit, and directly to described object MSC, send handover request by intercarrier interface.
Mode two: described IWF initiates to switch to object MSC by source MSC: described IWF sends handover request to source MSC, wherein carries described object MSC address digit; Described source MSC sends handover request according to described object MSC address digit to described object MSC;
Mode three: according to the switchover policy of operator's configuration, described IWF directly sends handover request to described object MSC according to described MSC address digit by intercarrier interface.
The inventive method by configuring adjacent cell index and corresponding MSC address digit list thereof in MME, IWF obtains object MSC address digit as the business and the media anchor point that switch from MME, when so just having overcome the switching that realizes CS business under EPS network access mode, because MSC is the unknowable and problem of handoff failure to object community, thereby guarantee to realize successful switch.
Below in conjunction with drawings and Examples, technical scheme of the present invention is described in detail.
Fig. 5 is the system reference frame diagram of embodiment, compared with prior art, IWF increased newly and MSC between intercarrier interface, as shown in Figure 5, described interface is standard interface, supports MAP and interoffice signaling.
Fig. 6 is first embodiment of the inventive method, and in this embodiment, the business of switching and media anchor point move to IWF, by IWF, complete switching, and MME disposes adjacent cell index and corresponding MSC address digit list thereof, realizes the method for switching and comprises:
601, UE initiates measurement report;
602, E-UTRAN, according to measurement report, initiates to switch requirement to MME, comprises object cell ID, cell-of-origin sign and current bearer service type;
603, MME receives handover request, according to object cell ID and current service bearer, judge whether speech business, if, MME is according to the object community in message, MME in abutting connection with office's cell association in the list of the MSC Server of office address digit, obtain the MSCServer address digit of object community service, to IWF, send forward direction and switch requirement, in message, comprise object MSC Server address digit, user ID (calling number or IMSI), switch the area sign of object community as each province, the area code in city, the handover information that MME obtains from E-UTRAN comprises object community, the information such as cell-of-origin,
If do not carry object MSC address digit information in 603a handover request message, IWF sends and asks for object MSC address digit request message to MME;
603b, MME return to object MSC address digit;
The mode that the 603rd, IWF obtains object MSC address digit by handover request message is described, and 603a-603b is the alternative of 603 modes, and the mode that IWF asks for request message by transmission is obtained the mode of object MSC address digit.
604, the IWF object MSC address digit that configuration directly adopts MME to provide according to switchover policy, to object, MSC sends out handover request;
Step 604 also can be processed in the following ways: IWF configuration purpose cell list, list is consistent with cell list and adjacency office cell list that it is served in MSC, IWF receives switching message, IWF judgement object community is in the cell list of configuration, think known, adopt prior art flow process, that is: by source MSC, to object MSC, send handover request; Otherwise, the object MSC address digit that IWF directly adopts MME to provide by intercarrier interface, to object, MSC sends out handover request.
605-606, object MSC agree to accept switching, distribute interface-free resources and land circuit, return to handover acknowledge, carry Handover Number and the wireless switching access information of distribution in response message;
607, IWF receives after handover acknowledge, initiates carrying set up request to forward direction switching office, and to address initial message (IAM) between targetMSC forwarding office, called number is filled out as Handover Number;
608, simultaneously, IWF sends forward direction handover acknowledge message to MME;
609-610, MME notify UE to switch by E-UTRAN;
611, UE carries out change detection and switching to Target MSC, and switching completes;
612, handover success Target BSS sends handoff completion message to Target MSC;
613, Target MSC passes to IWF handoff completion message, to IWF, returns to interoffice response message (ANM) signaling, circuit domain carrying between connection and IWF simultaneously;
614-615, IWF receive after handoff completion message and ANM, access side carrying and switch.After handover success, to MME, send and switched;
616, MME receives handoff completion message, discharges EPS resource.
Fig. 7 is the inventive method the second embodiment, mainly be with the difference of the first embodiment, the object MSC address digit information exchange that MME obtains according to switching object community is crossed switching message and is brought MSC， source, source MSC according to object MSC address digit information, to object MSC, initiates to switch.
The same 301-302 of 701-702;
703/703a/703b, same 603/603a/603b;
704, IWF receives and switches after message, and the source MSC serving to it sends handover request, carries object cell index and the object MSC address digit information switched in message,
705, source MSC, according to the object MSC address digit providing in message, sends handover request to object MSC.
The same 306-315 of 706-715, does not repeat them here.
In system architecture diagram shown in Fig. 8, IWF is logic function body, comprises two functional entitys, i.e. base station functions SUF (Simulation UTRAN Function, be called for short SUF) 806 and handoff functionality HOF (HandOver Function is called for short HOF) 807.
SUF base station functions module is mainly IWF function of the prior art, is mainly responsible for the translation function of signaling and carrying in call establishment.When base station functions module and handoff functionality module are different physical entity, base station functions entity has switching media and forwards handoff procedure message capability.
HOF handoff functionality module has MSC handoff functionality, is to be mainly responsible for IWF media handoff functionality.DangHOFWei independent community, it is equal to simple and easy MSC.
Fig. 9 is the 3rd embodiment flow chart of the changing method of realizing CS business of the system based on shown in Fig. 8, compare with two embodiment above, the present embodiment IWF is a logic body, it comprises SUF and two functional modules of HOF, flow process is basic identical with Fig. 7, the main distinction is, increases mutual between SUF and HOF.
The same 701-703b of 901-903b;
904, SUF receives handover request, and SUF is transmitted to HOF module handover request, carries carrying and set up solicited message and object MSC address digit in handover request;
905, HOF receives the handover request of SUF, the carrying between foundation and SUF;
906, set up after carrying, HOF, according to receiving the object MSC address digit in handover request message, sends handover request to object Target MSC;
907-908, object MSC agree to accept switching, distribute interface-free resources and land circuit, return to handover acknowledge, carry Handover Number and the wireless switching access information of distribution in response message;
909, HOF receives handover acknowledge, is transmitted to SUF;
910, HOF sets up request, address initial message (IAM) to carrying between TargMSC forwarding office simultaneously;
911-913, SUF receive handover acknowledge, and by EPS network notice, UE switches;
914-917, UE are switched to new circuit-domain network, to object circuit-domain network, send handoff completion message, and notice is to HOF, TargMSC connect simultaneously and HOF between bearer connection, return to response message (ANM);
918, HOF receives and has switched, to SUF, send and switched,
919, SUF receives and has switched, and connects the carrying between source MSC and HOF, after success, removes and is connected voice bearer with EPS network, and send and switched to MME;
920, MME receives handoff completion message, discharges EPS resource.
In order to realize the above method that CS business is switched that realizes under EPS network access mode, the present invention also provides a kind of system that realizes, and this system comprises that base station, Mobility Management Entity MME, Interworking GateWay IWFJi object mobile switching centre are object MSC, wherein,
Described base station, for sending handover request to described MME, wherein carries Target cell index;
Described MME, for preserving adjacent cell index and corresponding MSC address digit list thereof, the handover request also sending for receiving described base station, and the object MSC address digit corresponding according to the Target cell search index in handover request, also for sending handover request and described object MSC address digit to described IWF;
Described IWF, the handover request and the described object MSC address digit that for receiving described IWF, forward; Also for initiating to switch to described object MSC;
The method that described IWF obtains object MSC address digit has following two kinds:
One, described MME sends described handover request and described object MSC address digit by handover request message to described IWF.
Two, described IWF receives after handover request, and IWF is for sending the request of asking for object MSC address digit to described MME; Described MME sends object MSC address digit by response message to IWF.
Described object MSC, for carrying out handover operation.
In order to realize above three embodiment, mainly there is following difference in IWF or object MSC:
Corresponding to the first embodiment:
Described IWF directly sends handover request to described object MSC according to described object MSC address digit by intercarrier interface;
In order to realize IWF, initiate the process of switching to object MSC in addition, system of the present invention has following functions:
Described system also comprises source MSC, and for preserving the MSC list of community and coupling thereof, the handover request also sending for receiving IWF, inquires about corresponding object MSC according to the Target cell in handover request, and sends handover request to described object MSC;
Described IWF is also for preserving cell list, and the list in the source MSC of described list and its service is consistent; Described IWF receives after handover request, also for judging whether object community is list Zhong community, if, described IWF is also for sending handover request to source MSC, otherwise, described IWF, also for utilizing the described object MSC address digit obtaining, directly sends handover request to described object MSC by intercarrier interface.
Corresponding to the second embodiment:
Described IWF also comprises source MSC, when described IWF initiates to switch to object MSC, for sending handover request to source MSC, wherein carries object MSC address digit; Described source MSC is for sending handover request according to described object MSC address digit to described object MSC.
Corresponding to the 3rd embodiment, described IWF comprises base station functions and handoff functionality module, the handover request that described base station functions sends for receiving described MME, also for to described handoff functionality module forwards handover request, wherein carry media and set up information and described object MSC address digit, also for set up and described handoff functionality module between carrying; Described handoff functionality module is used for receiving described handover request, and the carrying between foundation and described base station functions module, also for initiating to switch to described object MSC; Described object MSC completes after switching, also for sending handover acknowledge to described handoff functionality module; Described handoff functionality module is also for receiving described handover acknowledge and being transmitted to described base station functions module, described base station functions module is used for receiving described handover acknowledge, also for connecting the carrying between source MSC and described handoff functionality module, and the voice bearer that is connected with EPS network of removing.
Certainly; the present invention also can have other various embodiments; in the situation that not deviating from spirit of the present invention and essence thereof; those of ordinary skill in the art are when making according to the present invention various corresponding changes and distortion, but these corresponding changes and distortion all should belong to the protection range of the appended claim of the present invention.
Compared with prior art, the inventive method and system by configuring adjacent cell index and corresponding MSC address digit list thereof in MME, IWF obtains object MSC address digit as the business and the media anchor point that switch from MME, when so just having overcome the switching that realizes CS business under EPS network access mode, because MSC is the unknowable and problem of handoff failure to object community, thereby guarantee to realize successful switch.
Claims (10)
1. under the grouping domain system network access mode of evolution, realize the method that circuit domain business switches for one kind, it is characterized in that, realize the method based on system in Mobility Management Entity MME dispose adjacent cell index and corresponding MSC address digit list thereof, the method comprises:
Base station sends handover request to Mobility Management Entity MME, carries object cell index in described handover request;
Described MME receives described handover request, and sends handover request to Interworking GateWay IWF;
Described IWF receives described handover request, and from described MME, to obtain object mobile switching centre corresponding to object cell index be object MSC address digit;
Described IWF initiates to switch to object MSC according to the object MSC address digit obtaining.
2. the method for claim 1, is characterized in that:
The mode that described IWF obtains described object MSC address digit be following any:
Described MME sends handover request message to described IWF, wherein carries described handover request and described object MSC address digit, and described IWF receives described handover request message and obtains described object MSC address digit;
Described IWF sends and asks for after the request of object MSC address digit to described MME, by described MME, returns to described object MSC address digit, and described IWF obtains described object MSC address digit.
3. the method for claim 1, is characterized in that:
Described IWF initiates to switch to described object MSC by following any mode:
Described IWF allocating cell list, described list is consistent with the cell list in the MSC of source, and described IWF receives after handover request judge whether object community is list Zhong community, if so, by source MSC, to object MSC, initiates to switch; Otherwise from described MME, obtain described object MSC address digit, and directly to described object MSC, send handover request by intercarrier interface;
Described IWF sends handover request to source MSC, wherein carries described object MSC address digit; Described source MSC sends handover request according to described object MSC address digit to described object MSC;
Described IWF directly sends handover request by intercarrier interface to described object MSC according to described MSC address digit.
4. under the grouping domain system network access mode of evolution, realize the system that circuit domain business switches, it is characterized in that, this system comprises that base station, Mobility Management Entity MME, Interworking GateWay IWFJi object mobile switching centre are object MSC, wherein,
Described base station, for sending handover request to described MME, wherein carries Target cell index;
Described MME, for preserving adjacent cell index and corresponding MSC address digit list thereof, the handover request also sending for receiving described base station, and the object MSC address digit corresponding according to the Target cell search index in handover request, also for sending handover request and described object MSC address digit to described IWF;
Described IWF, the handover request and the described object MSC address digit that for receiving described MME, forward; Also for initiating to switch to described object MSC;
Described object MSC, for carrying out handover operation.
5. system as claimed in claim 4, is characterized in that: described MME sends described handover request and described object MSC address digit by handover request message to described IWF.
6. system as claimed in claim 4, is characterized in that: described IWF receives after handover request, also for send the request of asking for object MSC address digit to described MME; Described MME sends object MSC address digit by response message to IWF.
7. the system as described in any one in claim 4 to 6, it is characterized in that: described system also comprises source MSC, for preserving the MSC list of community and coupling thereof, the handover request also sending for receiving IWF, according to the Target cell in handover request, inquire about corresponding object MSC, and send handover request to described object MSC;
Described IWF is also for preserving cell list, and described list is consistent with the list in the MSC of source; Described IWF receives after handover request, also for judging whether object community is list Zhong community, if, described IWF is also for sending handover request to source MSC, otherwise, described IWF, also for utilizing the described object MSC address digit obtaining, directly sends handover request to described object MSC by intercarrier interface.
8. the system as described in any one in claim 4 to 6, is characterized in that: described IWF directly sends handover request to described object MSC according to described target MSC address digit by intercarrier interface.
9. the system as described in any one in claim 4 to 6, is characterized in that: described system also comprises source MSC, when described IWF initiates to switch to object MSC, for sending handover request to source MSC, wherein carries object MSC address digit; Described source MSC is for sending handover request according to described object MSC address digit to described object MSC.
10. the system as described in any one in claim 4 to 6, it is characterized in that: described IWF comprises base station functions and handoff functionality module, the handover request that described base station functions sends for receiving described MME, also for to described handoff functionality module forwards handover request, wherein carry media and set up information and described object MSC address digit, also for set up and described handoff functionality module between carrying; Described handoff functionality module is used for receiving described handover request, and the carrying between foundation and described base station functions module, also for initiating to switch to described object MSC; Described object MSC completes after switching, also for sending handover acknowledge to described handoff functionality module; Described handoff functionality module is also for receiving described handover acknowledge and being transmitted to described base station functions module, described base station functions module is used for receiving described handover acknowledge, also for connecting the carrying between source MSC and described handoff functionality module, and the voice bearer that is connected with the grouping domain system EPS network of evolution of removing.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910130012.5A CN101848516B (en) | 2009-03-26 | 2009-03-26 | Method and system for realizing CS-service switching in EPS network access mode |
| PCT/CN2009/074046 WO2010108359A1 (en) | 2009-03-26 | 2009-09-18 | Method and system for implementing cs service handover under the eps network access mode |
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| Application Number | Priority Date | Filing Date | Title |
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| CN200910130012.5A CN101848516B (en) | 2009-03-26 | 2009-03-26 | Method and system for realizing CS-service switching in EPS network access mode |
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| CN101848516A CN101848516A (en) | 2010-09-29 |
| CN101848516B true CN101848516B (en) | 2014-02-05 |
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| CN200910130012.5A Expired - Fee Related CN101848516B (en) | 2009-03-26 | 2009-03-26 | Method and system for realizing CS-service switching in EPS network access mode |
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| CN103313344B (en) * | 2012-03-07 | 2017-04-05 | 中兴通讯股份有限公司 | The core net and its cut-in method of fusion |
| CN104170463B (en) * | 2014-04-09 | 2017-11-24 | 华为技术有限公司 | Adjacent area adding method and device |
| CN104507062B (en) * | 2014-12-15 | 2018-10-30 | 华为技术有限公司 | A kind of method, apparatus and system of service interaction |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101227677A (en) * | 2008-02-05 | 2008-07-23 | 中兴通讯股份有限公司 | Single wireless channel voice business continuity field switching method |
| CN101291541A (en) * | 2008-06-04 | 2008-10-22 | 华为技术有限公司 | Method, network element and system for evolution network to access circuit domain service |
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| CN1881958B (en) * | 2005-08-08 | 2011-12-07 | 华为技术有限公司 | Method and apparatus for user device switching from packet domain to circuit domain |
| CN1997216B (en) * | 2006-01-03 | 2011-01-12 | 华为技术有限公司 | Method for user device switching in the long evolving network |
| CN101523765B (en) * | 2006-09-28 | 2013-06-12 | 三星电子株式会社 | System and method of providing user equipment initiated and assisted backward handover in heterogeneous wireless networks |
| GB0707387D0 (en) * | 2007-04-17 | 2007-05-23 | Lucent Technologies Inc | Single radio VCC:LTE-VMSC anchor solution |
| CN101282581B (en) * | 2008-05-27 | 2011-12-07 | 中兴通讯股份有限公司 | Method for hard handoff between bureaus by multiple mobile switching centre identification |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101227677A (en) * | 2008-02-05 | 2008-07-23 | 中兴通讯股份有限公司 | Single wireless channel voice business continuity field switching method |
| CN101291541A (en) * | 2008-06-04 | 2008-10-22 | 华为技术有限公司 | Method, network element and system for evolution network to access circuit domain service |
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| CN101848516A (en) | 2010-09-29 |
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