CN101742590B

CN101742590B - Method and device for establishing connection with MSC

Info

Publication number: CN101742590B
Application number: CN 200810180624
Authority: CN
Inventors: 胡伟华; 陈中平; 周汉
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2008-11-18
Filing date: 2008-11-18
Publication date: 2013-02-27
Anticipated expiration: 2028-11-18
Also published as: CN101742590A

Abstract

The embodiment of the invention discloses a method and device for establishing connection with MSC. The method comprises the following steps: when the terminal is switched from a first network to a second network, a second network entity in the second network acquires the information of a first MSC of the terminal in the first network, wherein the first network is connected with the first MSC; and the second network entity establishes the connection with the first MSC according to the acquired information of the first MSC. The technical scheme of the embodiment of the invention ensures that the connected MSC can continue providing services for two networks, thereby continuously providing services for users and enhancing stability of the services of users.

Description

A kind of method and apparatus that connects with MSC

Technical field

The present invention relates to communication technical field, particularly relate to a kind of method and apparatus that connects with MSC (Mobile SwitchCenter, mobile switching centre).

Background technology

At GPRS (Genreral Packet Radio Service, GPRS)/UMTS (Universal Mobile Telecommunications System, universal mobile telecommunications system) with CS (Circuit Switched, circuit switching) packet network (the evolved packet system of the evolution of coexistence, EPS) in the framework, because existing a lot of business all operate in the circuit domain of GPRS/UMTS, professional in order in EPS, to reuse existing CS, proposed by the method for EPS network connection to the CS domain core net, MME in the EPS network (Mobility Management Entity, mobile management entity) is connected on the MSC of traditional C/S core net by a SGs interface.

Under this framework, when preparing to initiate the CS beginning, UE (User Equipment, subscriber equipment) exhales (MO, when Mobile Originating) professional, UE need to forward first the GPRS/UMTS network to, selects the residential quarter of a 2G/3G to be stationed, and then carries out the MO business.When receiving, MSC exhales (MT an end, when MobileTerminated) professional, MSC sends beep-page message by the SGs interface to MME, MME carries out paging by the EPS network to UE, after UE receives this beep-page message, need to forward first the GPRS/UMTS network to, select the residential quarter of a 2G/3G to be stationed, and then finish the subsequent treatment of this MT business.Therefore, this framework and processing method can be called " CS fallback " (the CS business is returned legacy network and processed).

A demand of evolvement network is to realize that Idle mode signalling reduction (also is referred to as saving signaling or limitation signaling under the idle pulley, be called for short ISR) function, it mainly is the mobile management flow process of UE between different access networks that reduces under the idle pulley, as, reduce GERAN (GSM EDGERadio Access Network, the gsm wireless Access Network of evolution)/UTRAN (UMTS TerritorialRadio Access Network, UMTS Terrestrial radio access network) and the Inter 3GPP Access System Mobility in Idle State between the EUTRAN (Evolved UMTSTerritorial Radio Access Network, the UMTS Terrestrial radio access network of evolution) process.The solution of the Idlemode signalling reduction mechanism between the 3GPP access network is two login mechanisms at present, be that UE registers at two different access networks, to not trigger Inter 3GPP Access System Mobility flow process when the UE under the idle pulley moves like this between these two access networks, as, inter-system RAU/TAU flow process.

In the LTE network, when combined registering of UE initiation or associated update flow process, if MME supports the SGs interface, MME can be established to for UE the connection of MSC in described flow process.

In the GERAN/UTRAN network, when UE initiates a combined registering or associated update flow process, if SGSN (Serving GPRS Support Node, Serving GPRS Support Node) supports Gs interface, SGSN can be established to for UE the connection of MSC in described flow process.

Present mechanism is thought, for supporting SGs interface MSC, can keep simultaneously the SGs interface to connect and be connected with Gs interface.UE for the ISR activation, if all carried out combined registering or renewal at LTE network and GERAN/UTRAN network, and set up the MME of ISR association and SGSN and same MSC and link together this moment, when called service is arranged, MSC can trigger MME paging UE by the SGs interface, also can trigger SGSN paging UE or trigger BSS (BaseStation Subsystem by the A/Iu-cs interface by Gs interface simultaneously, base station sub-system)/RNS (Radio Network Subsystem, RNS) paging UE.

For the UE that ISR activates, network side and do not know UE reside on earth in the LTE network or the GERAN/UTRAN network in, the above treatment mechanism can guarantee paging to the UE that is in Idle state, for the user provides reliable professional the guarantee.

In realizing process of the present invention, the inventor finds that there is following problem at least in prior art:

UE for the ISR activation, if connecting MSC in other words, the MME that sets up the ISR association and SGSN and different MSC only kept the SGs interface to connect or in connecting one of Gs, so called service ought be arranged, the MSC of the current registration of UE can only be in an active block paging UE, may paging arrive UE this moment, and business also can't normally be carried out like this.

Summary of the invention

The embodiment of the invention provides a kind of method and apparatus that connects with MSC, be used for realizing when terminal generation network switches, network entity in two networks is connected in same MSC, to guarantee to continue to provide service as two kinds of networks, thereby ensure the continuation for service that the user provides, improve the stability of customer service.

For achieving the above object, the embodiment of the invention proposes a kind of method that connects with MSC on the one hand, comprising:

When terminal switches to second network by first network, the second network entity that is arranged in described second network obtains described terminal in the information of the corresponding MSC of described first network, wherein, a described MSC is connected with first network entity in the first network;

Described second network entity connects with a described MSC according to the information of a described MSC who gets access to; Wherein, described second network entity is according to the information of a described MSC who gets access to, the mode that connects with a described MSC, comprise: according to the information of a described MSC who gets access to, described second network entity judges whether a described MSC can be described Terminal Service in described second network; When a described MSC cannot be described Terminal Service in described second network, described second network entity selection the 2nd MSC connected, and first network entity and described the 2nd MSC are connected.

On the other hand, the embodiment of the invention also proposes a kind of network entity, is positioned at second network, comprising:

Acquisition module is used for obtaining the information of described terminal corresponding MSC in described first network when terminal switches to second network by first network, and wherein, a described MSC is connected with first network entity in the first network;

Link block is used for the information according to the accessed described MSC of described acquisition module, connects with a described MSC; Judge module for the information of a described MSC who gets access to according to described acquisition module, judges whether a described MSC can be described Terminal Service in described second network; Wherein, described link block, also being used for judging a described MSC when described judge module cannot be when described second network be described Terminal Service, selection can be for the 2nd MSC of described Terminal Service connects in described second network, and first network entity and described the 2nd MSC are connected.

The technical scheme of the embodiment of the invention has the following advantages, because adopted the method and apparatus that the network entity in two kinds of networks is all connected with same MSC, thereby, assurance can continue to provide service for two kinds of networks, reach the continuation that ensures as service that the user provides, improved the effect of the stability of customer service.

Description of drawings

In order to be illustrated more clearly in the technical scheme of the embodiment of the invention, the accompanying drawing of required use was done to introduce simply during the below will describe embodiment, apparently, accompanying drawing in the following describes only is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain according to these accompanying drawings other accompanying drawing.

Fig. 1 is the schematic flow sheet of the method that connects of a kind of and MSC in the embodiment of the invention one;

Fig. 2 is the structural representation of a kind of network entity in the embodiment of the invention two;

Fig. 3 is the schematic flow sheet of the method that connects of a kind of and MSC in the embodiment of the invention three;

Fig. 4 is the schematic flow sheet of the method that connects of a kind of and MSC in the embodiment of the invention four;

Fig. 5 is the schematic flow sheet of the method that connects of a kind of and MSC in the embodiment of the invention five;

Fig. 6 is the schematic flow sheet of the method that connects of a kind of and MSC in the embodiment of the invention six;

Fig. 7 is the schematic flow sheet of the method that connects of a kind of and MSC in the embodiment of the invention seven;

Fig. 8 is the schematic flow sheet of the method that connects of a kind of and MSC in the embodiment of the invention eight;

Fig. 9 is the schematic flow sheet of the method that connects of a kind of and MSC in the embodiment of the invention nine;

Figure 10 is the schematic flow sheet of the method that connects of a kind of and MSC in the embodiment of the invention ten.

Embodiment

Below in conjunction with the accompanying drawing in the embodiment of the invention, the technical scheme in the embodiment of the invention is clearly and completely described, obviously, described embodiment only is a part of embodiment of the present invention, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills belong to the scope of protection of the invention not making the every other embodiment that obtains under the creative work prerequisite.

As shown in Figure 1, the schematic flow sheet of the method that a kind of and MSC that provides for the embodiment of the invention one connects, the method comprises:

Step S101, when terminal switches to second network by first network, the second network entity obtains the information of terminal corresponding MSC in first network.

Wherein, the second network entity is arranged in second network, and a MSC is connected with first network entity in the first network.

Concrete, the second network entity obtains the operation of terminal information of a corresponding MSC in first network, specifically comprises following three kinds of modes:

The information of the MSC that mode one, second network entity receiving terminal report.

Mode two, second network entity send query messages to the first network entity, and receive the information of the MSC that the first network entity returns.

Mode three, second network entity receive the information that the first network entity sends a MSC.

Wherein, the information of a MSC specifically can be carried by message such as RELOCATION REQUEST message, context response information by the first network entity and be sent.

Further, before the second network entity receives RELOCATION REQUEST message, also comprise:

The first network entity receives the handover request that source eNodeB sends;

The first network entity sends the RELOCATION REQUEST message of the information that comprises a MSC to the second network entity.

The information of the MSC that step S102, second network entity basis get access to connects with a MSC.

Concrete, the realization of this step comprises following flow process:

According to the information of a MSC who gets access to, the second network entity judges whether a MSC can be Terminal Service at second network.

When a MSC can be when second network be Terminal Service, second network entity and a MSC connect.

When a MSC cannot be when second network be Terminal Service, the second network entity selection can be that the 2nd MSC of Terminal Service connects at second network, and first network entity and the 2nd MSC are connected.

Wherein, the first network entity is arranged in first network.

In this step, the second network entity selection can be after the 2nd MSC of Terminal Service connects at second network, and the operation with first network entity and the 2nd MSC connect specifically comprises following three kinds of modes:

Mode one, trigger the tracing section updating flow process by terminal, first network entity and the 2nd MSC are connected, idiographic flow is as follows:

1, the second network entity sends the message of carrying indication information to terminal.

Wherein, when the effect of this indication information is to make terminal to return first network, trigger the tracing section updating flow process, first network entity and the 2nd MSC are connected.

2, when terminal is returned first network, terminal triggers the tracing section updating flow process according to above-mentioned indication information, sends the tracing section updating request to the first network entity.

Wherein, this tracing section updating request specifically comprises two kinds of situations:

(1) terminal sends the message of the information that comprises the 2nd MSC to the first network entity.

(2) terminal sends to the first network entity and comprises the message of triggering sign from the information of the 2nd MSC to the second network entity that obtain.

Wherein, triggering sign is a kind of special cell or indication, carry out corresponding handling process so that receive the entity of this triggering sign, this triggering sign can be preset in the entity that intercoms mutually or network, and the concrete setting means embodiment of the invention is not done restriction.

3, the first network entity connects with the 2nd MSC according to the tracing section updating request.

Two kinds of corresponding above-mentioned tracing section updating requests, the flow process that first network entity and the 2nd MSC connect also comprises two kinds of situations accordingly:

(1) the first network entity connects with the 2nd MSC according to the information of the 2nd MSC of terminal transmission.

(2) the first network entity obtains the information of the 2nd MSC according to triggering sign to the second network entity, and according to the information of the 2nd MSC, connects with the 2nd MSC.

Mode two, sent the information of the 2nd MSC to the first network entity by the second network entity, trigger first network entity and the 2nd MSC and connect, idiographic flow is as follows:

1, the second network entity sends the message of the information that comprises the 2nd MSC to the first network entity.

Wherein, comprise the message of the information of the 2nd MSC, specifically by context acknowledgement message, or location update message sends.

2, the first network entity connects according to information and the 2nd MSC of the 2nd MSC.

Wherein, comprise in the message of information of the 2nd MSC and also further comprise LAI (Location AreaIdentity location area), or, default reason mark.

Further, when also comprising LAI in the message that sends the information that comprises the 2nd MSC to the first network entity, the first network entity connects with the 2nd MSC according to information and the LAI of the 2nd MSC;

When also comprising default reason mark in the message that sends the information that comprises the 2nd MSC to the first network entity, the first network entity sends the message that comprises default reason mark to the 2nd MSC, the 2nd MSC connects with the first network entity according to default reason mark.

Further, when terminal is moved in second network, when causing the 2nd MSC to switch to the 3rd MSC, this method also comprises following handling process:

Second network entity and the 3rd MSC connect;

The second network entity sends the message of the information that comprises the 3rd MSC to the first network entity, the first network entity connects according to information and the 3rd MSC of the 3rd MSC.

Mode three, the 2nd MSC receive the information of the first network entity of second network entity transmission, the processing that active is initiated and the first network entity connects, and idiographic flow is as follows:

The 2nd MSC receives the message of the information that comprises the first network entity of second network entity transmission;

The 2nd MSC judges whether to connect with the first network entity according to the information of first network entity;

When the 2nd MSC judgement did not connect with the first network entity, the 2nd MSC sent the message of the information that comprises the 2nd MSC to the first network entity, connect with the first network entity.

The 3rd MSC and second network entity connect;

The 3rd MSC receives the message of the information that comprises the first network entity of second network entity transmission;

The 3rd MSC judges whether to connect with the first network entity according to the information of first network entity;

When the 3rd MSC judgement did not connect with the first network entity, the 3rd MSC sent the message of the information that comprises the 3rd MSC to the first network entity, connect with the first network entity.

Need to further be pointed out that, the information of mentioned first network entity is specially address information or the identification information of first network entity in preamble;

And a mentioned MSC, the 2nd MSC or the information of the 3rd MSC in preamble specifically comprise:

The address information of the one MSC, the 2nd MSC or the 3rd MSC; Or,

Sequence number or the identification information of the one MSC, the 2nd MSC or the 3rd MSC; Or,

The one MSC, the 2nd MSC or the 3rd MSC distribute to the LAI information of terminal; Or,

The one MSC, the 2nd MSC or the 3rd MSC distribute to LA information and the TMS information of terminal.

And when the information of a MSC, the 2nd MSC or the 3rd MSC is a MSC, the 2nd MSC or the 3rd MSC when distributing to the LAI information of terminal, the method also comprises:

The second network entity carries out addressing according to LAI information to a MSC, the 2nd MSC or the 3rd MSC, obtains the address information of a MSC, the 2nd MSC or the 3rd MSC;

When the information of a MSC, the 2nd MSC or the 3rd MSC is a MSC, the 2nd MSC or the 3rd MSC when distributing to the LAI information of terminal and TMSI information, the method also comprises:

The second network entity carries out addressing according to LAI information and TMSI information to a MSC, the 2nd MSC or the 3rd MSC, obtains the address information of a MSC, the 2nd MSC or the 3rd MSC.

Wherein, it is pointed out that above-mentioned LAI information can directly obtain, also can be to extract from RAI information.

Concrete, comprising LAC information in the coding structure of RAI, the composition structural representation of RAI information is as follows:

RAI＝MCC+MNC+LAC+RAC，

Further, the composition structural representation of LAI information is:

LAI＝MCC+MNC+LAC，

Composition structure based on above-mentioned LAI and RAI information can be found out; each composition information of LAI information all is contained in the RAI information; can be by in RAI information, extracting the extraction that corresponding information realizes LAI information; so the RAI information that provides is provided in the technical scheme that the embodiment of the invention proposes equally; then extract the technical scheme of LAI information from RAI information, such variation does not affect protection scope of the present invention.

The explanation of above-mentioned relation about RAI and LAI is equally applicable to the technical scheme that subsequent embodiment of the present invention proposes, and this point all is consistent among the corresponding embodiment below, repeated description no longer among the follow-up embodiment of the present invention.

The corresponding above-mentioned embodiment of the invention one method that connects with MSC that propose, as shown in Figure 2, the structural representation of a kind of network entity that provides for the embodiment of the invention two, this network entity specifically comprises:

Acquisition module 1 is used for obtaining the information of terminal corresponding MSC in first network when terminal switches to second network by first network, and wherein, first network is connected with a MSC.

Further, the corresponding aforementioned embodiment of the invention more than one methods that connect with MSC that propose, this acquisition module 1 is different according to the mode of obtaining information, specifically can be divided into following three kinds of structures:

Structure one, comprise and receive submodule 11, be used for the information of the MSC that receiving terminal reports.

Structure two, comprise inquiry submodule 12 and receive submodule 11.

Inquiry submodule 12 is used for sending query messages to the first network entity,

Receive submodule 11, be used for receiving the information of the MSC that the first network entity returns.

Structure three, comprise and receive submodule 11, be used for receiving the RELOCATION REQUEST message of the information that comprises a MSC that the first network entity sends.

It is to be noted; three kinds of above-mentioned structures are variations of making according to the difference of acquisition of information mode; but; under concrete enforcement scene; can comprise simultaneously above-mentioned three kinds of structures in the acquisition module 1; perhaps only comprise one or more structures wherein, such variation does not affect protection scope of the present invention.

Link block 2 is used for the information according to the accessed MSC of acquisition module 1, connects with a MSC.

Further, in the network entity that the present embodiment proposes, also comprise:

Judge module 3 for the information of a MSC who gets access to according to acquisition module 1, judges whether a MSC can be Terminal Service at second network.

In the case, link block 2 also is used for judging that when judge module 3 MSC can when second network is Terminal Service, connect with a MSC; Or be used for when judge module 3 judgements the one MSC cannot be when second network be Terminal Service, selection can be that the 2nd MSC of Terminal Service connects at second network, and first network entity and the 2nd MSC are connected.

Wherein, the first network entity is arranged in first network.

Further, the corresponding aforementioned embodiment of the invention more than one methods that connect with MSC that propose, this link block 2 specifically can be divided into following three kinds of structures according to connecting the mode difference:

Structure one, comprise connexon module 21 and send submodule 22, wherein:

Connexon module 21 is used for and can be that the 2nd MSC of Terminal Service connects at second network;

Send submodule 22, be used for sending the message of carrying indication information to terminal, when indication information makes terminal return first network, trigger the tracing section updating flow process, the 2nd MSC that the first network entity is connected with connexon module 31 connects.

Structure two, comprise connexon module 21 and send submodule 22, in this structure:

Send submodule 22, be used for sending to the first network entity message of the information that comprises the 2nd MSC that connexon module 31 connects, the first network entity connects according to information and the 2nd MSC of the 2nd MSC.

Structure three, only comprise and send submodule 22, be used for sending to the 2nd MSC the message of the information that comprises the first network entity, so that the 2nd MSC triggers the flow process that connects with the first network entity.

It is to be noted; three kinds of above-mentioned structures are variations of making according to the difference of the mode that connects; but; under concrete enforcement scene; can comprise simultaneously above-mentioned three kinds of structures in the link block 2; perhaps only comprise one or more structures wherein, such variation does not affect protection scope of the present invention.

Further, this network entity also comprises:

Addressed module 4, when the information that is used for the MSC that obtains when acquisition module is LAI information, according to LAI information, corresponding MSC is carried out addressing, obtain the address information of each corresponding MSC, or, when the information of the MSC that obtains when acquisition module is LAI information and TMSI information, according to LAI information and TMSI information, corresponding MSC is carried out addressing, obtain the address information of corresponding MSC.

Above-mentioned module can be distributed in a device, also can be distributed in a plurality of devices.Above-mentioned module can be merged into a module, also can further split into a plurality of submodules.

The embodiment of the invention three has proposed a kind of method that connects with MSC, and its purpose is: when ISR activated, the MME and the SGSN that set up the ISR association were connected to same MSC.Its basic thought and key problem in technology point are as follows:

To be moved to SGSN by MME as example, UE initiates joint route and upgrades (RAU), SGSN to MME inquire employed MSC information (as, SGSN inquires about to MME by Context Request message), MME to SGSN provide MSC information (as, MME feeds back to SGSN by ContextResponse message).

Wherein, the MSC information that provides can be the MSC address information, also can be sequence number or identification information, or MSC distributes to the LAI information of UE, or MSC distributes to LAI information and the TMSI information of UE.

In addition, the information of MSC also can be provided by UE, UE in registration message with above-mentioned MSC information band to SGSN, for example, UE carries LAI information and TMSI information in RAU Request message, send to SGSN.

SGSN obtains the employed MSC of MME address, if this MSC can continue as UE service is provided, SGSN just selects therewith that MSC connects so, and namely MME and SGSN are connected to same MSC, so that UE is connected to same MSC in setting up two networks of ISR association.

As shown in Figure 3, by example three of the present invention the schematic flow sheet of a kind of method that connects with MSC of proposition, the method specifically may further comprise the steps:

A, attachment flow

Step S301, UE are attached to MME.

By attachment flow, UE successfully is attached on the MME.

UE is at Attach Request Attach Request message indicating CS fallback indicator, and MME also needs UE is registered to MSC1.This moment, MME and MSC1 connected.

B, ISR activation process

Step S302, UE send the routing update request to SGSN.

UE moves under the SGSN, initiates joint route and upgrades, and sends routing update request RoutingArea Update Request message to SGSN.

The processing that follow this moment has, and carries the information of MSC to SGSN in the routing update request message.

It is pointed out that the information that provides can be the MSC address information, also can be sequence number or identification information, or MSC distributes to the LAI information of UE, or MSC distributes to LAI information and the TMSI information of UE.(SGSN utilizes LAI information, or LAI information addressing is connected the MSC that connects with TMSI information).

Step S303, SGSN send context request Context Request message to MME, require to obtain the context that the user preserves at MME.

Wherein, the processing of the employed MSC address information of acquisition MME has two kinds of methods:

1) in step S302, the address information of UE active reporting MSC is to SGSN (also can be sequence number or the identification information of MSC, or MSC distributes to the LAI information of UE, or MSC distributing to LAI information and the TMSI information of UE);

2) if the associated update that UE initiates, namely SGSN need to connect with certain MSC, SGSN carries the MSC address information that cell inquiry MME preserves in message.

Wherein, the cell form can be " MSC needed " etc., and the variation of concrete cell form does not affect protection scope of the present invention.

Step S304, MME return context response Context Response message to SGSN, carry the ability information that MME supports ISR in the message.

MME provides the address information of MSC to SGSN according to the inquiry of SGSN in Context Response message.

Here the information of MSC is provided also can be initiatively to MME, can't help the paging of SGSN to trigger.The information that provides can be the MSC address information, also can be sequence number or the identification information of MSC, or MSC distributes to the LAI information of UE, or MSC distributes to the LAI information of UE and TMSI information (SGSN utilizes LAI information, or LAI information addressing is connected the MSC that connects with TMSI information).

For other cell or form that can characterize the information of MSC, the embodiment of the invention is not done restriction.

Step S305, SGSN send context and confirm (Context Ack) message to MME, if determine to start ISR, then at the message indicating to MME, ISR enables.

Step S306, SGSN judge according to the information of the MSC1 that obtains whether MSC1 can serve for UE.

Concrete, SGSN judges whether MSC1 can continue as UE and provide the method for service as follows:

1) (Access Network can report the UE present position to SGSN according to the current present position of UE, no matter be LAI or extract LAI information from RAI) select MSC, still can be served by MSC1 if find zone, the current present position of UE, so then judged result is yes, otherwise the determination result is NO.

2) (Access Network can report the UE present position to SGSN according to the current present position of UE, no matter be LAI or extract LAI information from RAI) select MSC, for example (use the current present position of UE by configuration or dns resolution, for example, LAI) obtain the MSC tabulation that to serve, MSC1 is if there is in tabulation, and then judged result is yes, otherwise the determination result is NO.

Further, above-mentioned determination methods is equally applicable to MME and judges whether MSC can continue as UE and provide service, hereinafter no longer repeat specification.

When judged result when being, execution in step S307;

When the determination result is NO, then need to be implemented as the flow process that UE selects new MSC, concrete flow process is described in detail in the follow-up embodiment of the invention five, embodiment seven and embodiment nine, no longer explanation in the present embodiment.

It is to be noted; whether the above-mentioned MSC of judgement can continue as UE, and the explanation of particular content of the method for service is provided all is consistent in the follow-up embodiment of the present invention; below this is incited somebody to action no longer repeated description, but this does not affect protection scope of the present invention.

Step S307, SGSN send location update request message Location Update Request to MSC1.

SGSN judges according to the address of the selected MSC1 of MME that obtains, and provide service if this MSC1 can continue as UE, MSC1 is for connecting therewith for SGSN so, and namely UE is connected to same MSC in setting up two networks of ISR association.

Step S308, MSC1 send the position renewal to SGSN and accept message (Location UpdateAccept), and this moment, MSC1 guaranteed that SGSN and the MME related with setting up ISR connects.

Step S309, SGSN initiate Routing Area Update to UE and accept message (Routing Area UpdateAccept).

Step S310, UE initiate Routing Area Update to SGSN and finish message (Routing Area UpdateComplete).

The embodiment of the invention four has proposed the method that a kind of and MSC connect, and its purpose is: when switching, set up the MME of ISR association and SGSN and same MSC and connect.Its basic thought and key problem in technology point are as follows:

To be moved to SGSN by MME as example, source enode Source eNodeB initiates handover request (Handover Required), and MME provides MSC information (ForwardRelocation Request message) to SGSN.

Wherein, the MSC information that provides can be the MSC address information, also can be sequence number or the identification information of MSC, or MSC distributes to the LAI information of UE, or MSC distributes to LAI information and the TMSI information of UE.

After switching was finished, UE initiated joint route and upgrades (RAU).

In addition, the information of MSC also can be provided by UE, UE in registration message with LAI information, or LAI information and TMSI information band to SGSN (as, UE carries LAI information and TMSI information by RAU Request message, sends to SGSN).

As shown in Figure 4, by example four of the present invention the schematic flow sheet of a kind of method that connects with MSC of proposition, the method specifically may further comprise the steps:

A, attachment flow

Idiographic flow is as described in " attachment flow " in the embodiment of the invention three, and the present embodiment is explanation no longer separately.

B, switching flow

Step S402, Source eNodeB initiate handover request message (HandoverRequired) to MME.

Step S403, MME transmit RELOCATION REQUEST message (Forward Relocation Request) to SGSN, carry simultaneously the MSC1 information that is connected with MME and the ability information of MME support ISR.

Here MSC1 information can be the MSC address information, also can be sequence number or the identification information of MSC, or MSC distributes to the LAI information of UE, or MSC distributes to the LAI information of UE and TMSI information (SGSN utilizes LAI information, or LAI information addressing is connected the MSC that connects with TMSI information).

Step S404, SGSN transmit relocation response message (Forward Relocation Response) to MME.

If determine to start ISR, then at the message indicating to MME, ISR enables.

Step S405, MME transmit reorientation and finish message (Forward Relocation Complete) to SGSN.

Step S406, MME return switching command (HandoverCommand) to Source eNodeB.

Step S407, Source eNodeB notice UE switching is finished.

Send switching command (Handover from E-UTRANCommand) from E-UTRAN to UE

After step S408, switching were finished, UE initiated routing update request message (RoutingArea Update Request) to SGSN.

The processing that follow this moment has, and carries the address information of MSC to SGSN in the routing update request message.The information that provides can be the MSC address information, also can be sequence number or the identification information of MSC, or MSC distributes to the LAI information of UE, or MSC distributes to the LAI information of UE and TMSI information (SGSN utilizes LAI information, or LAI information addressing is connected the MSC that connects with TMSI information).

Step S409, SGSN judge according to the information of the MSC1 that obtains whether MSC1 can serve for UE.

When judged result when being, execution in step S410;

When the determination result is NO, then need to be implemented as the flow process that UE selects new MSC, concrete flow process is described in detail in the follow-up embodiment of the invention six, embodiment eight and embodiment ten, no longer explanation in the present embodiment.

Step S410, SGSN send location update request message Location Update Request message to MSC1.

SGSN judges that according to the address of the selected MSC1 of MME that obtains (concrete acquisition pattern can be that MME provides to SGSN among the step S403, perhaps reported to SGSN by UE among the step S408), if this MSC1 can continue as UE service is provided, then SGSN selects this MSC1 to connect, be that MME and SGSN are associated with same MSC1, so that UE is connected to same MSC in setting up two networks of ISR association.

Step S411, MSC1 send the position to SGSN and upgrade acceptance.

This moment, MSC1 guaranteed that simultaneously the SGSN related with setting up ISR be connected connection with MME.

Step S412, SGSN return routing update to UE and accept message.

The embodiment of the invention five has proposed a kind of method that connects with MSC, and its purpose is: when ISR activated, the MME and the SGSN that set up the ISR association were connected to same MSC.The method is the further perfect of technical scheme that the embodiment of the invention three is proposed, MSC1 proposed in the situation that can not continue as the SGSN service, SGSN selects other MSC, and the flow process that this MSC and SGSN and MME are connected, and its basic thought and key problem in technology point are as follows:

To be moved to SGSN by MME as example, UE initiates joint route and upgrades (RAU), and SGSN inquires employed MSC information (Context Request message) to MME, and MME provides MSC information (Context Response message) to SGSN.

In addition, the information of MSC also can be provided by UE, and with LAI information, or LAI information and TMSI information band are to SGSN (RAU Request message is carried above-mentioned information to UE) in registration message.

SGSN obtains the employed MSC of MME address, if this MSC can't provide service for UE, SGSN reselects a MSC so, and notice is set up the related MME of ISR with it and this MSC connects simultaneously.

SGSN more notifies UE (RAU Accept message) in the new technological process in co-location, makes UE that state is set, and gets back to the E-UTAN network and initiate the tracing section updating flow process (TAU) of uniting at once under the scene that ISR activates.

Need to prove, processing method possible in above-mentioned flow process is: carry " MSC changed " IE or " Combined TAU Needed " IE etc. in the RAU Accept message to UE.Instruct MS C changes, and gets back to the MSC that the E-UTRAN network need to reselect service.

Accordingly, UE receives after the above-mentioned message, possible processing method is: the temporary mark (Temporary Identity used in Next update, TIN) that next update is used is set to " P-TMSI " or GUTI is set to " Update needed " or UE and a state " TAU needed " etc. scheme is set can triggers UE and get back to the MSC that the E-UTRAN network is initiated the service that reselects.

Make MME obtain the MSC information that connects with it from SGSN by newly-increased message.Be initiated to the connection building process of new MSC.

In addition, the information of MSC also can be provided by UE, and with LAI information, or LAI information and TMSI information band are to MME (TAU Request message is carried above-mentioned information to UE) in registration message.

As shown in Figure 5, by example five of the present invention the schematic flow sheet of a kind of method that connects with MSC of proposition, the method specifically may further comprise the steps:

A, attachment flow

B, ISR activation process

Step S502 to step S505, concrete steps content such as the step S302 in the embodiment of the invention three as described in the step S305, the present embodiment is explanation no longer separately.

Step S506, SGSN judge according to the information of the MSC1 that obtains whether MSC1 can serve for SGSN.

When judged result when being, carry out in the aforesaid embodiment of the invention three step S307 to the described flow process of step S310, no longer explanation in the present embodiment.；

When the determination result is NO, execution in step S507.

Step S507, SGSN send location update request message Location Update Request message to MSC2.

SGSN judges that according to the address of the selected MSC1 of MME that obtains MSC1 can not think that UE provides service, and then SGSN selects a new MSC2 to connect.

Step S508, MSC2 send the position to SGSN and upgrade acceptance.

Step S509, SGSN initiate Routing Area Update to UE and accept message.

This message makes UE that an internal state or the mode such as flag are set by carrying the modes such as special cell or indication, guarantees that UE initiates associating tracing section updating flow process immediately when getting back to the E-UTRAN network under the ISR activation scenario.

Wherein, the embodiment of the invention such as entrained special cell or indication is not done further restriction in this message, and the mode that can reach constructed effect all belongs to protection scope of the present invention.

Step S510, UE initiate Routing Area Update to SGSN and finish message.

When UE gets back under the E-UTRAN network MME, UE is according to the description among step S509 in " ISR activations ", and triggering tracing section updating flow process is described as follows:

C, tracing section updating flow process

Step S511, UE send the tracing section updating request message to MME.

When UE gets back under the E-UTRAN network MME, UE is according to the description among " ISR activations " middle step S509, immediately initiating updating of tracking area request message.

The processing here has two kinds of possibilities:

1) " Update Type " cell (Information Elements, IE) is set to special cause value in the tracing section updating request message, guarantees that MME obtains the information of its employed MSC to the SGSN that sets up the ISR association.

Be that MME carries out follow-up step S512 to step S514.

2) address information that UE can carry MSC2 in the tracing section updating request message, or sequence number or identification information, or MSC distributes to the LAI information of UE, or MSC distributes to the LAI information of UE and TMSI information (MME can utilize LAI information, or LAI information and the addressing of the TMSI information MSC2 that need to connect) information reporting to MME.

For example, in TAU message, carry: " MSC Address " or " MSC Number " or " TAI and or TMSI ".

Need to further be pointed out that, carry " Old GUTI " cell in the TAU message.If TIN is designated as " P-TMSI " at this moment, then Old GUTI=P-TMSI+RAI.Can from RAI information, obtain about above-mentioned LAI information, be equally applicable in this step.

In addition, in the present TAU flow process, when TIN is designated as " P-TMSI ", MME needs execution in step S512 to step S514 and SGSN synchronous context so.But this moment, MME only need to obtain the address information of MSC2, did not need and SGSN synchronous context (prerequisite is that in the situation that ISR activates, the bearer context of UE does not change).So also need to arrange an indication information, indication MME does not need the synchronous context with SGSN.For example: carry TMSI information in TAU message, MME does not need the synchronous context with SGSN with regard to MME.

For above-mentioned processing mode 2), the address information of MSC2 is provided by UE, MME does not need to carry out follow-up step S512 to step S514.

Step S512 to step S514, concrete steps content such as the step S302 in the embodiment of the invention three as described in the step S305, the present embodiment is explanation no longer separately.

Step S515, MME are initiated to the position update flow of MSC2.

MME selects MSC according to the residing positional information of current UE (LAI information), because in the E-UTRAN network, the UE positional information that MME receives is TAI, so MME need to be mapped as TAI information LAI information.Like this, according to aforesaid determination methods, if MSC2 can't be for UE provides service in the E-UTRAN network, to reselect one can be the MSC of UE service to MME so.Subsequent operation is as described in the embodiment of the invention three.

This situation belongs to abnormal conditions, and operator can avoid by the network planning and configuration the generation of this situation.

Further, another feasible method is as follows:

MME can with UE in the GERAN/UTRAN network residing positional information (LAI information) as its positional information (LAI information) in the E-UTRAN network.That is, MME does not need TAI information is mapped as LAI information.Can guarantee that like this MSC for the UE service continues to be the UE service in the E-UTRAN network in the GERAN/UTRAN network.

For first access E-UTRAN network, MME can configure default positional information (LAI information), MME and be that UE selects the MSC that can serve according to this LAI information.When UE from E-UTRAN network insertion GERAN/UTRAN network, the scheme that provides according to the embodiment of the invention, if MSC can also be the UE service in the GERAN/UTRAN network, then SGSN establishes a connection to MSC, is the UE service otherwise reselect MSC in the GERAN/UTRAN network.At this moment, MME notifies UE (TAU Accept message) in the tracing section updating flow process of associating, make UE that state is set, under the scene that ISR activates, get back to the GERAN/UTRAN network and initiate the Routing Area Update flow process (RAU) of uniting at once, then the UE Routing Area Update flow process (RAU) that can initiate to unite is the MSC. that UE selects service by SGSN

Corresponding above-mentioned process description, possible processing method is: carry " MSC changed " cell or " Combined RAU Needed " cell etc. in the TAU Accept message to UE, instruct MS C changes, and gets back to the MSC that the GERAN/UTRAN network need to reselect service.

Further, UE after receiving above-mentioned information may processing method be: TIN is set to " GUTI " or P-TMSI is set to " Update needed " or UE and a state or " Combined RAU Needed " etc. scheme is set can triggers UE and get back to the MSC that the GERAN/UTRAN network is initiated the service that reselects.

Specifically as shown in Figure 5, comprise that MME sends location update request message to MSC2, MSC2 is to HSS (Home Subscriber Server, home subscriber server) sends the request of upgrading the position, HHS sends the notification message of canceling position to MSC1, MSC1 sends the affirmation message of canceling position to HSS, and HSS sends the affirmation message that the position is upgraded to MSC2, MSC2 upgrades a series of flow processs such as acceptance to the MME home position, jointly finished the position update flow of MSC2.It is pointed out that each mentioned step can be adjusted accordingly in the foregoing description where shown in the figure in concrete enforcement scene, can reach the position that makes MSC2 and finish other flow processs of renewal and belong to too protection scope of the present invention.

On the other hand, here MME to obtain the address information of MSC2 as follows:

1) can be by possibility 1 among the step S511) description, provided by SGSN;

2) can be by possibility 2 among the step S511) description, provided by UE.

At this moment, MSC2 simultaneously the SGSN related with setting up ISR be connected connection with MME.MSC2 and HSS interactive information are upgraded the information among the HSS.

Step S516, MME send tracing section updating to UE and accept message, and the MME that sets up the ISR association is connected with MSC2 with SGSN simultaneously.

Step S517, UE send tracing section updating to MME and finish message.

Need to further be pointed out that, the technical scheme that the embodiment of the invention proposes is equally applicable to the movement of UE under SGSN, the situation that LA changes.In corresponding handling process, UE initiates the associated update of SGSN inside, and wherein, SGSN does not change, in the ISR activation process of scenario B not execution in step S503 to step S505.

Further, because the impact (LA changes) of the band of position causes MSC to change, the technical scheme that this moment, the invention described above embodiment proposed can guarantee that equally SGSN and MME that ISR is associated are connected to same MSC.

Inventive embodiments six has proposed a kind of method that connects with MSC, and its purpose is: when switching, the MME and the SGSN that set up the ISR association are connected to same MSC.The method is the further perfect of technical scheme that the embodiment of the invention four is proposed, MSC1 proposed in the situation that can not continue as the SGSN service, SGSN selects other MSC, and the flow process that this MSC and SGSN and MME are connected, and its basic thought and key problem in technology point are as follows:

To be moved to SGSN by MME as example, Source eNodeB initiates handover request (HandoverRequired), and MME provides MSC information (Forward Relocation Request message) to SGSN.

After switching was finished, UE initiated joint route and upgrades (RAU).The information of MSC also can be provided by UE, and with LAI information, or LAI information and TMSI information band are to SGSN (RAU Request message is carried above-mentioned information to UE) in registration message.

SGSN obtains the employed MSC of MME address, if this MSC can't provide service for UE, SGSN reselects a MSC so, and notice is set up the related MME of ISR with it and connected with new MSC simultaneously.

SGSN more notifies UE (RAU Accept message) in the new technological process in co-location, makes UE that state is set, and gets back to the E-UTAN network and initiate the tracing section updating flow process (TAU) of uniting at once under the scene that ISR activates.Make MME obtain the MSC information that connects with it from SGSN by newly-increased message.Be initiated to the connection building process of new MSC.

As shown in Figure 6, by example six of the present invention the schematic flow sheet of a kind of method that connects with MSC of proposition, the method specifically may further comprise the steps:

A, attachment flow

B, switching flow

Step S602 to step S608, concrete steps content such as the step S402 in the embodiment of the invention four as described in the step S408, the present embodiment is explanation no longer separately.

Step S609, SGSN judge according to the information of the MSC1 that obtains whether MSC1 can serve for SGSN.

When judged result when being, carry out in the aforesaid embodiment of the invention four step S410 to the described flow process of step S412, no longer explanation in the present embodiment;

When the determination result is NO, execution in step S610.

Step S610, SGSN send location update request message Location Update Request message to MSC2.

Step S611, MSC2 send the position to SGSN and upgrade acceptance.

Step S612, SGSN initiate Routing Area Update to UE and accept message.

When UE gets back under the E-UTRAN network MME, UE is according to the description among step S612 in " ISR activations ", and triggering tracing section updating flow process is described as follows:

C, tracing section updating flow process

In the present embodiment, tracing section updating flow process and the aforesaid embodiment of the invention five described tracing section updating flow processs are basically identical, difference wherein is, in step S613, when UE gets back under the E-UTRAN network MME, UE is the state setting according to step S612 in " switching ", immediately initiating updating of tracking area request message.

The embodiment of the invention seven has proposed a kind of method that connects with MSC, and its purpose is: when ISR activated, the MME and the SGSN that set up the ISR association were connected to same MSC.The method is the further perfect of technical scheme that the embodiment of the invention three is proposed, MSC1 proposed in the situation that can not continue as the SGSN service, SGSN selects other MSC, and the flow process that this MSC and SGSN and MME are connected, and its basic thought and key problem in technology point are as follows:

SGSN obtains the employed MSC of MME address, if this MSC can't provide service for UE, SGSN reselects a MSC so, and notice is set up the related MME of ISR with it and MSC connects simultaneously.

SGSN connects with new MSC by existing message (Context Ack) or newly-increased message informing MME at the S3 interface.After MME receives message, initiate the flow process that connects with new MSC.

As shown in Figure 7, by example seven of the present invention the schematic flow sheet of a kind of method that connects with MSC of proposition, the method specifically may further comprise the steps:

A, attachment flow

B, ISR activation process

Step S702 to step S704, concrete steps content such as the step S302 in the embodiment of the invention three as described in the step S304, the present embodiment is explanation no longer separately.

Step S705, SGSN judge according to the information of the MSC1 that obtains whether MSC1 can serve for SGSN.

When the determination result is NO, execution in step S706, or after execution in step s707 and step S708, execution in step S709.

Step S706, SGSN send context and confirm (Context Ack) message to MME, transmit the newly address information of the MSC2 of selection to MME.

SGSN sends the context of the address information that comprises MSC2 and confirms that (Context Ack) message is to MME.

Cell for transmitting in context affirmation (Context Ack) message has following two kinds of processing methods:

1) carry the address information of LAI and MSC2 in the message, the method for expressing of the address information of MSC2 is as described in the embodiment three;

2) address information of cause specific value or cell and MSC2, MSC2 receives this cause specific value or cell, know this moment MME to initiate be a process that connects with it, not carrying LAI information in the message does not affect follow-up processing yet.

Step S707, SGSN send location update request message Location Update Request message to MSC2.

Step S708, MSC2 send the position to SGSN and upgrade acceptance.

Further, if SGSN does not transmit the newly address information of the MSC2 of selection to MME among the step S706, increase step S709 in this flow process, particular content is:

Step S709, SGSN send location update message to MME, send the address information of MSC2 to MME.

For the cell that transmits in the location update message, following two kinds of processing methods can be arranged:

1) carry the address information of LAI and MSC2 in the message, the method for expressing of the address information of MSC2 is as described in the embodiment one;

2) address information of cause specific value or cell and MSC2, MSC2 receives cause specific value or cell, know this moment MME to initiate be a process that connects with it, not carrying LAI information in the message does not affect follow-up processing yet.

The effect of this step is that the address information of the MSC2 that SGSN will newly select brings MME, has adopted the form of SGSN to MME launch position updating message, and the present invention does not limit message or the form that adopts other.

It is to be noted; whether comprising step S709 in the flow process that the present embodiment proposes need to decide according to the address information that whether has sent MSC2 to MME among the step S706; when having sent this information among the step S706; step S709 will no longer need; otherwise; then need step S709 to finish the task of the address information that sends MSC2, therefore, whether comprising step S709 does not affect protection scope of the present invention.

Step S710, MME are initiated to the position update flow of MSC2.

The idiographic flow of this step is as described in the step S515 in the aforementioned embodiment of the invention five, repeated description no longer in the present embodiment.

It is pointed out that here MME is connected to MSC2 two kinds of possibilities are arranged:

1) obtain by the described method of step S706, can not carry out follow-up step S709 this moment;

2) if SGSN then obtains by step S709 not to the address information of MME transmission MSC2 among the step S706.

Step S711, MME send the position to SGSN and upgrade acknowledge message.

If in the signature process, do not comprise step S709, then, step S711 is also default accordingly.

Step S712, SGSN initiate Routing Area Update to UE and accept message.

Step S713, UE initiate Routing Area Update to SGSN and finish message.

Need to further be pointed out that, the technical scheme that the embodiment of the invention proposes is equally applicable to the movement of UE under SGSN, the situation that LA changes.In corresponding handling process, UE initiates the associated update of SGSN inside, and wherein, SGSN does not change, in the ISR activation process of scenario B not execution in step S703 to step S706.

Because the impact (LA changes) of the band of position causes MSC to change, this moment, such scheme can guarantee that equally SGSN and MME that ISR is associated are connected to same MSC.

SGSN connects with new MSC by existing message (Forward Relocation Response) or newly-increased message informing MME at the S3 interface.After MME receives message, initiate the flow process that connects with new MSC.

As shown in Figure 8, by example eight of the present invention the schematic flow sheet of a kind of method that connects with MSC of proposition, the method specifically may further comprise the steps:

A, attachment flow

B, switching flow

Step S802 to step S803, concrete steps content such as the step S402 in the embodiment of the invention four as described in the step S403, the present embodiment is explanation no longer separately.

Step S804, SGSN send and transmit relocation response message to MME.

Processing for transmitting in the relocation response message can have following two kinds of processing methods:

Step S805, MME send the forwarding reorientation and finish message to SGSN.

Step S806 to step S811, concrete steps content such as the step S606 in the embodiment of the invention six as described in the step S611, the present embodiment is explanation no longer separately.

Step S812, SGSN are to MME launch position updating message.

If SGSN does not transmit the address information of the new MSC2 that selects among the step S804 to MME, then SGSN is to MME launch position updating message.

Step S813, MME are initiated to the position update flow of MSC2.

Here MME is connected to MSC2 two kinds of possibilities:

1) obtain by the described method of step S804, can not carry out follow-up step S812 this moment;

2) if or among the step S804 SGSN do not send the address information of MSC2 to MME, then obtain by step S812.

Step S814, MME send the position to SGSN and upgrade acknowledge message.

Step S815, SGSN initiate Routing Area Update to UE and accept message.

The embodiment of the invention nine has proposed a kind of method that connects with MSC, and its purpose is: when ISR activated, the MME and the SGSN that set up the ISR association were connected to same MSC.The method is the further perfect of technical scheme that the embodiment of the invention three is proposed, MSC1 proposed in the situation that can not continue as the SGSN service, SGSN selects other MSC, and the flow process that this MSC and SGSN and MME are connected, and its basic thought and key problem in technology point are as follows:

In addition, the information of MSC also can be provided by UE, and with LAI information, or LAI information and TMSI information band are to SGSN (RAU Request message is carried LAI information to UE, or LAI information and TMSI information) in registration message.

SGSN tells new MSC (Location Update Request message), MSC to find that MME does not connect with it MME address in message, then sends out the flow process that message (message on the newly-increased SGs interface) notice MME initiation connects.Also can think that MSC initiatively sends out message informing MME this moment, and MME replys response, finishes establishment of connection.

As shown in Figure 9, by example nine of the present invention the schematic flow sheet of a kind of method that connects with MSC of proposition, the method specifically may further comprise the steps:

A, attachment flow

B, ISR activation process

Step S902 to step S905, concrete steps content such as the step S302 in the embodiment of the invention three as described in the step S305, the present embodiment is explanation no longer separately.

Step S906, SGSN judge according to the information of the MSC1 that obtains whether MSC1 can serve for SGSN.

When the determination result is NO, namely SGSN judged that according to the address of the selected MSC1 of MME that obtains MSC1 can not think that UE provides service, and then SGSN selects a new MSC2 to connect execution in step S907.

Step S907, SGSN send location update request message Location Update Request message to MSC2.

Carry the MME address of setting up the ISR association in this message and inform MSC2, SGSN carries a special indication in also might message and triggers MSC2 and send message to MME and connect, and namely carries out subsequent step S908.

The MME address information that step S908, MSC2 report by SGSN if do not connect with it, then sends location update message to setting up the related MME of ISR with SGSN.

For " position renewal " message here, the present invention does not do restriction to message name, and effect is to set up being connected between MSC2 and the MME.

Carry the address information (for example, SGSN Number) of MSC in this message, perhaps other characterizes cell or the form of MSC address information.

Step S909, MME recover response to MSC2 and set up being connected between MME and the MSC2.

The position update flow of step S910, MSC2.

It is pointed out that in this step, MSC2 upgrades to the MME home position to accept, but execution in step S911, step difference does not herein affect protection scope of the present invention.

Step S911, MSC2 send the position renewal to SGSN and accept message, inform that SGSN connects foundation and finishes.

Step S912, SGSN initiate Routing Area Update to UE and accept message.

Step S913, UE initiate Routing Area Update to SGSN and finish message.

Need to further be pointed out that, the technical scheme that the embodiment of the invention proposes is equally applicable to the movement of UE under SGSN, the situation that LA changes.In corresponding handling process, UE initiates the associated update of SGSN inside, and wherein, SGSN does not change, in the ISR activation process of scenario B not execution in step S903 to step S905.

Inventive embodiments ten has proposed a kind of method that connects with MSC, and its purpose is: when switching, the MME and the SGSN that set up the ISR association are connected to same MSC.The method is the further perfect of technical scheme that the embodiment of the invention four is proposed, MSC1 proposed in the situation that can not continue as the SGSN service, SGSN selects other MSC, and the flow process that this MSC and SGSN and MME are connected, and its basic thought and key problem in technology point are as follows:

To be moved to SGSN by MME as example, Source eNodeB initiates handover request (Handover Required), and MME provides MSC information (Forward Relocation Request message) to SGSN.

SGSN tells new MSC (Location Update Request message), MSC to find that MME does not connect with it MME address in message, then sends out the flow process that message (message on the newly-increased SGs interface) notice MME initiation connects.Also can think that MSC initiatively sends out message informing MME this moment, and MME replys response, finishes to connect and set up.

As shown in figure 10, by example ten of the present invention the schematic flow sheet of a kind of method that connects with MSC of proposition, the method specifically may further comprise the steps:

A, attachment flow

B, switching flow

Step S1002 to step S1008, concrete steps content such as the step S402 in the embodiment of the invention four as described in the step S408, the present embodiment is explanation no longer separately.

Step S1009, SGSN judge according to the information of the MSC1 that obtains whether MSC1 can serve for SGSN.

When the determination result is NO, namely SGSN judged that according to the address of the selected MSC1 of MME that obtains MSC1 can not think that UE provides service, and then SGSN selects a new MSC2 to connect execution in step S1010.

Step S1010, SGSN send location update request message Location Update Request message to MSC2.

Carry in this message and set up the related MME address of ISR with it and inform MSC2, SGSN carries a special indication in also might message and triggers MSC2 and send message to MME and connect.That is, carry out subsequent step S1011.

The MME address information that step S1011, MSC2 report by SGSN if do not connect with it, then sends location update message to setting up the related MME of ISR with SGSN.

Step S1012, MME recover response to MSC2 and set up being connected between MME and the MSC2.

Step S1013, MME are initiated to the position update flow of MSC2.

It is pointed out that in this step, MSC2 upgrades to the MME home position to accept, but execution in step S1014, step difference does not herein affect protection scope of the present invention.

Step S1014, MSC2 send the position renewal to SGSN and accept message, inform that SGSN connects foundation and finishes.

Step S1015, SGSN initiate Routing Area Update to UE and accept message.

Through the above description of the embodiments, those skilled in the art can be well understood to the present invention and can realize by hardware, also can realize based on such understanding by the mode that software adds necessary general hardware platform, technical scheme of the present invention can embody with the form of software product, it (can be CD-ROM that this software product can be stored in a non-volatile memory medium, USB flash disk, portable hard drive etc.) in, comprise that some instructions are with so that a computer equipment (can be personal computer, server, the perhaps network equipment etc.) carry out the described method of each embodiment of the present invention.

It will be appreciated by those skilled in the art that accompanying drawing is the schematic diagram of a preferred embodiment, the module in the accompanying drawing or flow process might not be that enforcement the present invention is necessary.

The above only is preferred implementation of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; can also make some improvements and modifications, these improvements and modifications also should be looked protection scope of the present invention.

Claims

1. a method that connects with moving exchanging center MSC is characterized in that, comprising:

When terminal switched to second network by first network, the second network entity that is positioned at described second network obtained the information of a MSC, and wherein, a described MSC is connected with first network entity in the first network;

Described second network entity connects with a described MSC according to the information of a described MSC who gets access to;

Wherein, described second network entity is according to the information of a described MSC who gets access to, and the mode with a described MSC connects comprises:

According to the information of a described MSC who gets access to, described second network entity judges whether a described MSC can be described Terminal Service in described second network;

When a described MSC cannot be described Terminal Service in described second network, described second network entity selection the 2nd MSC connected, and first network entity and described the 2nd MSC are connected.

2. the method for claim 1 is characterized in that, described second network entity obtains the mode of terminal information of a corresponding MSC in described first network, specifically comprises:

Described second network entity receives the information of a described MSC of described terminal to report; Or,

Described second network entity sends query messages to described first network entity, and receives the information of the described MSC that described first network entity returns; Or,

Described second network entity receives the information of the described MSC that described first network entity reports.

3. method as claimed in claim 2 is characterized in that, described second network entity receives the information of the described MSC that described first network entity reports, is specially:

Described second network entity receives the RELOCATION REQUEST message of the information that comprises a described MSC of described first network entity transmission; Or,

Described second network entity receives the context response information of the information that comprises a described MSC of described first network entity transmission.

4. method as claimed in claim 3 is characterized in that, before the RELOCATION REQUEST message of the information that comprises a described MSC that described second network entity reception first network entity sends, also comprises:

The handover request that described first network entity reception sources enode source eNodeB sends;

Described first network entity sends the described RELOCATION REQUEST message that comprises the information of a MSC to the second network entity.

5. method as claimed in claim 2 is characterized in that, first network entity and described the 2nd MSC are connected, and comprising:

Described second network entity sends the message of carrying indication information to described terminal, when described indication information makes described terminal return described first network, trigger the tracing section updating flow process;

Described first network entity obtains the message of the information of described the 2nd MSC;

Described first network entity connects with described the 2nd MSC according to the information of described the 2nd MSC.

6. method as claimed in claim 5 is characterized in that, described first network entity obtains the mode of message of the information of described the 2nd MSC, specifically comprises:

Described first network entity receives the message of the information that comprises described the 2nd MSC of described terminal transmission; Or,

Described first network entity receives that described terminal sends comprises the message of triggering sign from the information of described the 2nd MSC to described second network entity that obtain, and according to described triggering sign, obtains the information of described the 2nd MSC to described second network entity.

7. the method for claim 1 is characterized in that, described first network entity and described the 2nd MSC is connected, and specifically comprises:

Described second network entity sends the message of the information that comprises described the 2nd MSC to described first network entity, described first network entity connects according to information and described the 2nd MSC of described the 2nd MSC.

8. method as claimed in claim 7, it is characterized in that, also further comprise default reason mark in the message of the described information that comprises described the 2nd MSC, then described first network entity connects according to information and described the 2nd MSC of described the 2nd MSC, is specially:

Described first network entity sends the message that comprises described default reason mark to described the 2nd MSC, described the 2nd MSC connects with described first network entity according to described default reason mark.

9. method as claimed in claim 7 is characterized in that, the described message that sends the information that comprises described the 2nd MSC to the first network entity is specially:

The context acknowledgement message that described second network entity sends to described first network entity; Or,

The location update message that described second network entity sends to described first network entity.

10. method as claimed in claim 7 is characterized in that, when described terminal is moved in described second network, when causing described the 2nd MSC to switch to the 3rd MSC, also comprises:

Described second network entity and described the 3rd MSC connect;

Described second network entity sends the message of the information that comprises described the 3rd MSC to described first network entity, described first network entity connects according to information and described the 3rd MSC of described the 3rd MSC.

11. the method for claim 1, it is characterized in that, when a described MSC cannot be described Terminal Service in described second network, described second network entity selection can be in described second network for after the 2nd MSC of described Terminal Service connects, also comprise:

Described the 2nd MSC receives the message of the information that comprises described first network entity of second network entity transmission;

When described the 2nd MSC did not connect with described first network entity, described the 2nd MSC sent the message of the information that comprises described the 2nd MSC to described first network entity, connect with described first network entity.

12. method as claimed in claim 11 is characterized in that, when described terminal is moved in described second network, when causing described the 2nd MSC to switch to the 3rd MSC, also comprises:

Described the 3rd MSC and described second network entity connect;

Described the 3rd MSC receives the message of the information that comprises described first network entity of described second network entity transmission;

Described the 3rd MSC judges whether to connect with described first network entity according to the information of described first network entity;

When described the 3rd MSC judgement did not connect with described first network entity, described the 3rd MSC sent the message of the information that comprises described the 3rd MSC to described first network entity, connect with described first network entity.

13. method as claimed in claim 12 is characterized in that, the information of a described MSC, the 2nd MSC or the 3rd MSC specifically comprises:

The address information of a described MSC, the 2nd MSC or the 3rd MSC; Or,

Sequence number or the identification information of a described MSC, the 2nd MSC or the 3rd MSC; Or,

A described MSC, the 2nd MSC or the 3rd MSC distribute to the lane place identification code LAI information of described terminal; Or,

A described MSC, the 2nd MSC or the 3rd MSC distribute to LAI information and the temporarily moved subscriber identify label TMSI information of described terminal.

14. method as claimed in claim 13 is characterized in that,

When the information of a described MSC, the 2nd MSC or the 3rd MSC is that a described MSC, the 2nd MSC or the 3rd MSC are when distributing to the LAI information of described terminal, described method also comprises according to described LAI information, described second network entity carries out addressing to a described MSC, the 2nd MSC or the 3rd MSC, obtains the address information of a described MSC, the 2nd MSC or the 3rd MSC; Or,

When the information of a described MSC, the 2nd MSC or the 3rd MSC is that a described MSC, the 2nd MSC or the 3rd MSC are when distributing to the LAI information of described terminal and TMSI information, described method also comprises according to described LAI information and TMSI information, described second network entity carries out addressing to a described MSC, the 2nd MSC or the 3rd MSC, obtains the address information of a described MSC, the 2nd MSC or the 3rd MSC.

15. a network entity is positioned at second network, it is characterized in that, comprising:

Acquisition module is used for obtaining the information of described terminal corresponding MSC in described first network when terminal switches to second network by first network, and wherein, a described MSC is connected with first network entity in the described first network;

Link block is used for the information according to the accessed described MSC of described acquisition module, connects with a described MSC;

Judge module for the information of a described MSC who gets access to according to described acquisition module, judges whether a described MSC can be described Terminal Service in described second network;

Wherein, described link block, also being used for judging a described MSC when described judge module cannot be when described second network be described Terminal Service, selection can be for the 2nd MSC of described Terminal Service connects in described second network, and first network entity and described the 2nd MSC are connected.

16. network entity as claimed in claim 15 is characterized in that, described acquisition module specifically comprises:

Receive submodule, for the information of a described MSC who receives described terminal to report; Or receive the information of the described MSC that described first network entity returns.

17. network entity as claimed in claim 16 is characterized in that, when described reception submodule was used for receiving the information of the described MSC that described first network entity returns, described acquisition module also comprised:

The inquiry submodule is used for sending query messages to described first network entity.

18. network entity as claimed in claim 15 is characterized in that, described link block specifically comprises:

The connexon module is used for and can connects at two MSC of described second network for described Terminal Service;

Send submodule, be used for sending the message of carrying indication information to described terminal, when described indication information makes described terminal return described first network, trigger the tracing section updating flow process, the first network entity is connected with the 2nd MSC that the first connexon module is connected.

19. network entity as claimed in claim 18 is characterized in that,

Described connexon module also is used for and can connects at two MSC of described second network for described Terminal Service;

Described transmission submodule also is used for sending to described first network entity the message of the information that comprises the 2nd MSC that the second connexon module connects, and described first network entity connects according to information and described the 2nd MSC of described the 2nd MSC.

20. network entity as claimed in claim 18 is characterized in that,

Described transmission submodule is for the message that sends the information that comprises described first network entity to described the 2nd MSC, so that described the 2nd MSC triggers the flow process that connects with described first network entity.

21. network entity as claimed in claim 15 is characterized in that, also comprises:

Addressed module, when the information that is used for the MSC that obtains when described acquisition module is LAI information, according to described LAI information, corresponding MSC is carried out addressing, obtain the address information of each corresponding MSC, or, when the information of the MSC that obtains when described acquisition module is LAI information and TMSI information, according to described LAI information and TMSI information, corresponding MSC is carried out addressing, obtain the address information of each corresponding MSC.