CN101128023B

CN101128023B - A method for establishing switching carrier

Info

Publication number: CN101128023B
Application number: CN200610111253A
Authority: CN
Inventors: 王耕
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2006-08-17
Filing date: 2006-08-17
Publication date: 2010-05-12
Anticipated expiration: 2026-08-17
Also published as: CN101128023A

Abstract

The utility model discloses a method for the establishment of switching bearing, which provides an alternative proposal of prior method for switching bearing, further solving the problem that the prior method for switching bearing can lead to insignificant waste of bearing resources. The utility model comprises: A. SDP information in offices of a switch-out office MSC and a switch-in office MSC called by the two offices after interactive switching; B. The switch-out office MSC calls MSC of the other party using the SDP information of the switch-in office for media re-negotiation, and builds the bearing between the switch-in office and the MSC of the other party. The utility model has advantages of building switching bearing in another method and further avoiding insignificant waste of bearing resources by implementing the method.

Description

A kind of method of setting up switching carrier

Technical field

The present invention relates to the communications field, particularly relate to a kind of method of setting up switching carrier.

Background technology

The present invention relates to the WCDMA 3-G (Generation Three mobile communication system),, comprising referring to shown in Figure 1:

UE/MS: i.e. the terminal equipment of user's use often is called mobile phone.

RNC/BSS: mainly be responsible for the management of Radio Access Network.

MGW: mainly be responsible for the management of various bearing resources, connect the practical operation of net.

MSC SERVER: be the core of system, mainly be responsible for the logic control of miscellaneous service, unified scheduling various network resources generates message registration.

SIP media re-negotiation function: refer to the session of setting up in the SIP mode, after session is built up, each function that can under the situation of not interrupting session, make amendment to quantity, type or the address (as IP address or port) of the Media Stream that built up of communication.

Existing inter-office switchover process comprises: before the inter-office switchover, and in the inter-office switchover process, and three parts after the inter-office switchover, corresponding diagram 2, Fig. 3 and shown in Figure 4 successively.(annotate: 1, the dotted line through MSC among the figure is represented signaling, through the dotted line representative carrying of MGW; 2, MSC-SA is for cutting out an innings MSC server; MSC-SB is the MSC of an incision office server.)

In the realization of existing inter-office switchover, when interoffice switches generation, cut out office and both be taken as the professional anchor point of controlling, also be taken as the anchor point of carrying, even the anchor point of so-called carrying is meant the user and has switched to its office, bearer path still can be through cutting out office, and as above-mentioned shown in Figure 4, MGW A carries anchor point exactly.

Cutting out the processing that office is taken as the anchor point of professional control is acceptable, otherwise unfavorable on the contrary, all be recorded in such as the interim subscription data of user and cut out office, incision office does not have these data, therefore have no idea to carry out related service and handle, such as CW or ECT in incision office.

But cut out office except being taken as professional anchor point, also be taken as the anchor point of carrying, yet the latter's processing is irrational under normal conditions.Such processing means when switch taking place, calling both sides will through cutting out innings forwarding operation data could with the other side's communication.Need bearer path through cutting out office's (being monitored cutting out office such as the user) unless cut out the service logic of office, adopting this practice so is not to be able to and for it.When cutting out office when not having this class demand, mode is set up in this circuitous carrying can cause meaningless bearing resource waste.

Summary of the invention

The invention provides a kind of method of setting up switching carrier, a kind of existing replacement scheme of setting up the method for switching carrier promptly is provided.

Further solve the problem that the existing method of setting up switching carrier can cause meaningless bearing resource waste.

The inventive method comprises the following steps:

A, cut out innings MSC and the MSC of incision office carries out alternately,, and make the MSC of incision office know the SDP information of calling out the opposing party's bearer path so that being used to of cutting out that innings MSC knows that the MSC of incision office distributes set up the SDP information of the bearing resource correspondence of inter-office switchover;

B, cut out innings MSC with the SDP information of the MSC of incision office with call out the opposing party place MSC and carry out media re-negotiation, and set up carrying between the MSC of incision office and the calling the opposing party place MSC.

Wherein, comprise among the described step B: cut out innings MSC and carry out media re-negotiation with calling the opposing party place MSC, and set up the carrying between the MSC of incision office and the calling the opposing party place MSC with the SDP information that the MSC of incision office sends.

Further, after described steps A, cut out innings MSC and carry out switching, cut out innings MSC afterwards and discharge a Radio Resource by the Access Network indicating terminal.

Further, after described steps A, discharge the bearing resource relevant, to optimize switching carrier with cutting out innings MSC.

Further again, if after finishing switching, because the needs of service logic, requirement cuts out innings MSC and is arranged in bearer path, then cut out innings MSC divide respectively be used in and the MSC of incision office and and call out and to set up the required bearing resource of carrying between the opposing party place MSC, and carry out media re-negotiation with the MSC of incision office and calling the opposing party place MSC respectively, be arranged in bearer path so that cut out innings MSC.

Further, described finishing requires to cut out the needs that innings MSC is arranged in bearer path corresponding service logic after the switching again and comprises: the interim playback demand that cuts out innings MSC.

Further again, after the described step B and the switchback operation taken place before taking out stitches, then comprise step: the former score of the game that cuts out is used in and calls out the required bearing resource of foundation carrying between the MSC of the opposing party place, and with the SDP information of this bearing resource correspondence with call out the opposing party place MSC and carry out media re-negotiation, to set up the former bearer path that cuts out between office and the calling the opposing party place MSC.

Further again, after the described step B and third party's operation has taken place to switch to before taking out stitches, then comprise the following steps:

C1, formerly cut out innings MSC and third party MSC carries out alternately, so that the former SDP information of bearing resource correspondence that is used to set up inter-office switchover that cuts out that innings MSC knows that third party MSC distributes, and make third party MSC know the SDP information of calling out the opposing party's bearer path;

C2, the former innings MSC that cuts out carry out media re-negotiation with the SDP information of third party MSC with calling the opposing party place MSC, and set up the carrying between third party MSC and the calling the opposing party place MSC.

Further, after described step C1, the former incision MSC of office carries out by the Access Network indicating terminal and switches, and the former afterwards incision MSC of office discharges Radio Resource.

Further, after described step C1, discharge and former innings MSC and the relevant bearing resource of the former incision MSC of office of cutting out, to optimize switching carrier.

In sum, before beginning switching,, select whether to optimize switching carrier according to the needs of service logic.

Further, it is characterized in that,, select not optimize switching carrier, then replace the ISUP signaling to finish the foundation of switching carrier, be anchored in the bearer path so that cut out innings MSC with the SIP-I signaling as if needs according to service logic.

Further, described selection is not optimized switching carrier corresponding service logic and is comprised: if the switch sides user is monitored cutting out innings MSC; Or this user carries out communication with data service, is assigned IWF resource IWF cutting out innings MSC; Or cut out innings MSC decision will be to user's playback.

A kind of method of setting up switching carrier comprises the following steps:

Cut out innings MSC and the mutual corresponding SDP information of bearing resource that is used to set up inter-office switchover of distributing of the MSC of incision office, and set up the bearer path cut out between office and the incision office, and connect the bearer path that cuts out before switching between innings MSC and the calling the opposing party place MSC with this passage;

Connect after two sections bearer path, cut out innings MSC and carry out media re-negotiation, cut out carrying between innings MSC and the MSC of incision office with dismounting with SDP information and the MSC of incision office that calls out the opposing party place MSC.

Beneficial effect of the present invention is as follows:

The inventive method comprises step: A, cut out the SDP information that innings MSC and the MSC of incision office switch calling both sides place, back office alternately; B, cut out innings MSC with the SDP information of the MSC of incision office with call out the opposing party place MSC and carry out media re-negotiation, and set up carrying between the MSC of incision office and the calling the opposing party place MSC.

Based on the said method step, steps A is finished and just gets ready for the carrying of setting up the MSC of incision office and call out between the opposing party place MSC, need not to cut out innings MSC again is anchored in the bearer path, so any time after the steps A can discharge the bearing resource relevant with cutting out innings MSC, to optimize switching carrier, it is circuitous to reduce bearer path, also helps reducing the business data transmission time delay.

The former situation that cuts out innings MSC of switchback after the inventive method has also been considered, and the situation that switches to third party office.

The inventive method also can select whether to optimize switching carrier according to the needs of service logic before switching.

Description of drawings

Fig. 1 is a WCDMA 3-G (Generation Three mobile communication system) structural representation;

Fig. 2 is the preceding schematic diagram of existing inter-office switchover;

Fig. 3 is schematic diagram in the existing inter-office switchover process;

Fig. 4 is a schematic diagram after the existing inter-office switchover;

Fig. 5 is the inventive method flow chart of steps;

Fig. 6 is the present invention basis hand-off process signaling process figure;

Fig. 7 is a switchback processing signaling flow chart of the present invention;

Fig. 8 switches to third party's office signaling flow chart for the present invention;

Fig. 9 is the inventive method example one flow chart;

Figure 10 is the inventive method example two flow charts;

Figure 11 is the inventive method example three flow charts.

Embodiment

For a kind of existing replacement scheme of setting up the method for switching carrier is provided, so that set up the method variation more of switching carrier, the invention provides a kind of method of setting up switching carrier, referring to shown in Figure 5, comprise following key step:

S1, cut out the SDP information that innings MSC and the MSC of incision office switch calling both sides place, back office alternately.

The station to station call process that is used for switching in foundation, cutting out innings MSC and the MSC of incision office carries out alternately, so that being used to of cutting out that innings MSC knows that the MSC of incision office distributes set up the SDP information of the bearing resource correspondence of inter-office switchover, and make the MSC of incision office know the SDP information of calling out the opposing party's bearer path.

S2, cut out innings MSC with the SDP information of the MSC of incision office with call out the opposing party place MSC and carry out media re-negotiation.

Cut out innings MSC set up with the MSC of incision office being used to of distributing inter-office switchover the bearing resource correspondence SDP information with call out the opposing party place MSC and carry out media re-negotiation, this SDP information of being about to sends to calls out the opposing party place MSC.

After this, in order to optimize switching carrier, it is circuitous to reduce bearer path, reduces the business data transmission time delay, can discharge the bearing resource relevant with cutting out innings MSC.

S3, set up the MSC of incision office and call out carrying between the opposing party place MSC.

Below based on specific implementation, the inventive method is described.

One, basic hand-off process (as: processing when switching first) referring to shown in Figure 6, comprises the following steps:

(annotate: for the purpose that gives top priority to what is the most important, this figure do not draw PRACK message and ACK message among the SIP, down with)

1, the foundation of station to station call and the initiation of switching and admittance.The process that station to station call is set up adopts the SIP-I mode, switches to initiate and the description of admittance process referring to 3GPP TS 23.009.

2, set up the station to station call that is used to switch.Set up in the process, cut out innings MSC-A and carry the SDP information that the opposing party's bearer path is called out in representative in INVITE, the MSC-B of incision office returns 180 message, wherein carries the SDP information that is used to set up the inter-office switchover carrying that MSC-B distributes.After this step, can discharge the bearing resource relevant, to optimize switching carrier with cutting out innings MSC-A.

3, this step is finished the process of switching, comprises two processing, and its sequencing can combination in any, can also carry out simultaneously:

3a:MSC-A carries out by the Access Network indicating terminal and switches, and terminal switches to MSC-B from MSC-A, and MSC-A discharges Radio Resource.

3b: carry out media re-negotiation by MSC-A and calling the opposing party place MSC, the SDP information of setting up the inter-office switchover carrying passed to and called out the opposing party MSC will the MSC-B that obtain distributes in second step be used to, and set up the carrying that is used to switch of calling out between the opposing party place MSC and the MSC-B of incision office.

4, dismantling call when end of calling.

Further referring to shown in Figure 6, the position of " X " can increase a treatment step in the 2nd step: by the needs of MSC-A according to service logic, select whether to optimize switching carrier, promptly select whether to carry out treatment step by the optimization switching carrier of step 2 and step 3b representative.This service logic includes but not limited to: if this user is monitored at MSC-A; Maybe this is used for carrying out communication with data service, is assigned IWF at MGW-A; Or the MSC-A decision will be to user's playback.

The position of ' step of replacing 2, step 2 ' is identical with step 2 if MSC-A according to the needs of service logic, selects not optimize switching carrier, then to use step 2.Step 2 ' processing be described below: replace the ISUP signaling to finish the foundation of switching carrier with the SIP-I signaling, be anchored in the bearer path so that cut out innings MSC.Promptly set up the station to station call that is used to switch, set up in the process, cut out innings MSC-A and be used in the bearing resource of switching at the local exchange branch, to represent the SDP information of this bearing resource to be carried in the INVITE, the MSC-B of incision office returns 180 message, wherein carry the SDP information that is used to set up the inter-office switchover carrying of MSC-B distribution, set up the bearer path that is used to switch that calling cuts out office and cuts interoffice; And to cut out the bearer path between innings MSC and the calling the opposing party place MSC before this passage connection switching.

Former step 3b will be cancelled.

Further, if MSC-A selects and has carried out prioritization scheme when switching, but afterwards because the needs of service logic (this service logic includes but not limited to: MSC-A has had the playback demand) temporarily, require MGW-A to be positioned among the bearer path, then divide respectively and be used in and MSC-B and call out and set up the required bearing resource of carrying between the opposing party place MSC by MSC-A control MGW-A, and the MSC-B that will set up by the heavy negotiation mechanism of SIP is connected with direct carrying between calling the opposing party place MSC and makes amendment, change the bearer path of forming by two sections into, one section is between MGW-B and MGW-A, one section is between MGW-A and calling the opposing party place MSC, thereby makes MGW-A be positioned among the bearer path.

There is a kind of replacement scheme in above-mentioned basic hand-off process:

Replace the switching carrier mode based on ISUP of ISUP with SIP-I earlier with 3GPP TS 23.009 descriptions, finish the foundation (promptly selecting the anchor point of MSC-A) of switching carrier as carrying. promptly cut out innings MSC-A and the mutual corresponding SDP information of bearing resource that is used to set up inter-office switchover of distributing of the MSC-B of incision office, and foundation cuts out the bearer path between office and the incision office, and to cut out the bearer path between innings MSC-A and the calling the opposing party place MSC before this passage connection switching. after switching carrier is set up, carry out media re-negotiation by MSC-A with SDP information and the MSC-B that calls out the opposing party place MSC, cut out carrying between innings MSC and the MSC of incision office with dismounting; Before this, afterwards or simultaneously, the MSC-A and the MSC at the opposing party place in calling out initiate media re-negotiation, set up MSC-B and are connected with the direct carrying of the opposing party place MSC of calling.

If two after basic hand-off process (switching first) takes place, and before taking out stitches, the terminal that its office has taken place again to switch to switches back to the situation (being follow-up switchback operation) of former office again, referring to shown in Figure 7, comprises the following steps:

1, finish terminal and switch back to the former processing that cuts out innings MSC-A, referring to the description of 3GPPTS 23.009 from the MSC-B of incision office.

2, this step is finished the process of switching, comprises two processing, and its sequencing can combination in any:

2a: remove the former calling that cuts out between innings MSC-A and the MSC-B of incision office.

2b: in basic hand-off process, select to optimize switching carrier and handle, the then former innings MSC-A branch that cuts out is used in and calls out the required bearing resource of foundation carrying between the MSC of the opposing party place, and with the SDP information of this bearing resource correspondence with call out the opposing party place MSC and carry out media re-negotiation, to set up the former bearer path that cuts out between office and the calling the opposing party place MSC.

If three after basic hand-off process (switching first) takes place, and before taking out stitches, the terminal that its office has taken place again to switch to switches to the situation (being the follow-up third party's of switching to operation) of third party office once more, referring to shown in Figure 8, comprises the following steps:

1, the foundation of station to station call, what switch first finishes, and follow-up initiation and admittance of switching to the third party.The process that station to station call is set up adopts the SIP-I mode, switches to initiate and the description of admittance process referring to 3GPP TS23.009.

2, the station to station call that foundation is used to switch is set up in the process, and the former innings MSC-A that cuts out carries the SDP information that the opposing party's bearer path is called out in representative in INVITE, the MSC-B ' of incision office returns 180 message, wherein carries the SDP information that is used to set up the inter-office switchover carrying that MSC-B ' distributes.After this step, can discharge and former innings MSC-A and the relevant bearing resource of the former incision MSC-B of office of cutting out, to optimize switching carrier.

3a: the former incision MSC-B of office carries out by the Access Network indicating terminal and switches, and terminal switches to MSC-B ' from the former incision MSC-B of office, and the former incision MSC-B of office discharges Radio Resource.

3b: carry out media re-negotiation with calling the opposing party place MSC by the former innings MSC-A that cuts out, the SDP information of setting up the inter-office switchover carrying passed to and called out the opposing party place MSC will the MSC-B ' that obtain distributes in second step be used to, and set up the carrying that is used to switch of calling out between the opposing party place MSC and the MSC-B ' of incision office.

4, discharge this and switch preceding MSC-A that sets up and the station to station call that is used to switch between MSC-B, discharge the MSC-B assigned radio resource.

Further, described in the basic hand-off process according to the needs of service logic select whether optimize switching carrier and select after the respective handling flow process; If when switching, select and carried out prioritization scheme, but afterwards because the needs of service logic, require MGW-A to be positioned at relevant treatment flow process among the bearer path again; And the replacement scheme of basic hand-off process, in switching to third party's operation, all be suitable for.

Below specifically describe the inventive method by three examples.

The scene of method example one, this embodiment: the user who switches is switched anteposition in 3G network MSC-A, desires to switch to a 2G network MSC-B, and what another user of this user and its office carried out is voice call service.Referring to shown in Figure 9, comprise the following steps:

1, call out the opposing party's (being called B side) and set up audio call in the SIP-I mode with desire switching side (being called A side).

2, it is relatively good that A perceives the signal of MSC-B, triggered (referring to 3GPP TS 23.009) so A switches to the process of MSC-B from MSC-A by the prior art mode, and RNC-A sends Iu-RELOCATION-REQUIRED message to MSC-A.

3, after MSC-A receives this message, send MAP-Prep-Handover req message to MSC-B, initiate inter-office switchover.

4, after MSC-B receives this handoff request message, send MAP-Allocate-Handover-Number req message request Handover Number to VLR, send handoff request to BSS-B simultaneously.

5, BSS-B returns handoff response.

6, VLR returns Handover Number.

7, MSC-B returns MAP-Prep-Handover resp message to MSC-A, accepts handoff request, and carries Handover Number.

8, after MSC-A receives this message, judge that the party A-subscriber does not have specific (special) requirements, can implement handover optimization scheme (annotate: this logic is optional), so initiate station to station call to MSC-B with Handover Number, calling the opposing party's of the SDP information description that it carries bearer path.

9, after MSC-B receives this call request, send MAP-Send-Handover-Reportresp message to VLR-B.

10, MSC-B distributes the station to station call bearing resource, and it is described as SDP information, carries to MSC-A by 180 message.

11, MSC-A initiates hand-off execution process by RNC-A to terminal.

12, terminal is carried out and is switched, and is linked into BSS-B, and BSS-B sends A-HO-DETECT and A-HO-COMPLETE message to MSC-B, and MSC-B sends MAP-Process-Access-Sig req and MAP-Send-End-Signal req message respectively to MSC-A.

13, MSC-B returns 200OK message to MSC-A.

14, MSC-A and B place office carry out media re-negotiation, will represent the SDP information of the bearing resource that distributes of MSC-B pass to B place office, set up the direct-connected carrying of this innings and MSC-B.

15, the processing of taking out stitches during end of calling.

Annotate: though present embodiment enumerates is the handoff procedure of 3G to 2G, the present invention be equally applicable to 3G to the switching of 3G, 2G to 2G switching and 2G to the switching of 3G.

The scene of method example two, this embodiment: the user who switches is switched anteposition in 3G network MSC-A, is positioned at 3G network MSC-B after switching is finished first, switches once more afterwards, switches to 2G network MSC-B ' from MSC-B.What another user of this user and its office carried out is voice call service (annotate: present embodiment is paid close attention to follow-up switching).Referring to shown in Figure 10, comprise the following steps:

1, call out the opposing party's (being called B side) and set up audio call in the SIP-I mode with desire switching side (being called A side), A switches to MSC-B (this process can referring to embodiment one) from MSC-A.

2, it is relatively good that A perceives the signal of MSC-B ', triggered (referring to 3GPP TS 23.009) so A switches to the process of MSC-B ' from MSC-B by the prior art mode, and RNC-B sends Iu-RELOCATION-REQUIRED message to MSC-B.

3, after MSC-B receives this message, send MAP-Prep-Sub-Handover req message to MSC-A, initiate the follow-up switching of interoffice, after MSC-A receives this message, send the inter-office switchover of MAP-Prepare-Handover req message request to MSC-B '.

4, after MSC-B ' receives this handoff request message, send MAP-Allocate-Handover-Number req message request Handover Number to VLR-B ', send handoff request to BSS-B ' simultaneously.

5, BSS-B ' returns handoff response.

6, VLR-B ' returns Handover Number.

7, MSC-B ' returns MAP-Prep-Handover resp message to MSC-A, accepts handoff request, and carries Handover Number.

8, after MSC-A ' receives this message, judge that the party A-subscriber does not have specific (special) requirements, can implement handover optimization scheme (annotate: this logic is optional), so initiate station to station call, calling the opposing party's of the SDP information description that it carries bearer path to MSC-B ' with Handover Number.

9, after MSC-B ' receives this call request, send MAP-Send-Handover-Reportresp message to VLR-B '.

10, MSC-B ' distributes the station to station call bearing resource, and it is described as SDP information, carries to MSC-A by 180 message.

11, MSC-A sends MAP-Prep-Sub-Ho resp message to MSC-B, and MSC-B initiates hand-off execution process by RNC-B to terminal.

12, terminal is carried out and is switched, be linked into BSS-B ', BSS-B ' sends A-HO-DETECT and A-HO-COMPLETE message to MSC-B ', and MSC-B ' sends MAP-Process-Access-Sig req and MAP-Send-End-Signal req message respectively to MSC-A.

13, MSC-B ' returns 200OK message to MSC-A.

14, MSC-A and B place office carry out media re-negotiation, will represent the SDP information of the bearing resource of MSC-B ' distribution to pass to B place office, set up the direct-connected carrying of this office and MSC-B '.

15, MSC-A discharges the carrying that is used to switch of originally setting up with MSC-B, and MSC-B discharges original Radio Resource of setting up that is used for switching last time.

16, the processing of taking out stitches during end of calling.

Annotate: though present embodiment enumerates is the follow-up switching third-party process of 3G to 2G, the present invention be equally applicable to 3G to 3G, 2G to 2G and 2G to the situation of 3G.

The scene of method example three, this embodiment: method example one described handoff procedure has at first taken place this scene (annotates: do not comprise and taking out stitches, take out stitches and do not take place as yet), having set up calling the opposing party place office is connected with the direct carrying of MSC-B interoffice, this moment, MSC-A was owing to there has been the playback demand temporarily, require this office must be positioned among the bearer path, so MSC-A distributes bearing resource, carry out media re-negotiation with the calling other direction in office and MSC-B, realize above-mentioned requirements.Referring to shown in Figure 11, comprise the following steps:

1, call establishment and switch generating process first is referring to the description of implementing one.

2, MSC-A has occurred switching user's playback demand, then MSC-A initiate local exchange is linked into processing in the bearer path, at first, the MSC-A Control Allocation be used for MSC-B and with call out the opposing party place interoffice and set up the bearing resource of bearer path.

3, MSC-A and calling the opposing party carry out media re-negotiation.Setting up MSC-A is connected with the carrying of calling out between the opposing party.

4, MSC-A and MSC-B carry out media re-negotiation.Setting up MSC-A is connected with carrying between MSC-B.

5, MSC-A carries out the playback processing to switching the user.

6, the processing of taking out stitches of end of calling.

Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention.Like this, if of the present invention these are revised and modification belongs within the scope of claim of the present invention and equivalent technologies thereof, then the present invention also is intended to comprise these changes and modification interior.

Claims

1. a method of setting up switching carrier is characterized in that, comprises the following steps:

2. the method for claim 1, it is characterized in that, comprise among the described step B: cut out innings MSC and carry out media re-negotiation with calling the opposing party place MSC, and set up the carrying between the MSC of incision office and the calling the opposing party place MSC with the SDP information that the MSC of incision office sends.

3. method as claimed in claim 2 is characterized in that, after described steps A, cuts out innings MSC and carries out switching by the Access Network indicating terminal, cuts out innings MSC afterwards and discharges a Radio Resource.

4. method as claimed in claim 2 is characterized in that, after described steps A, discharges the bearing resource relevant with cutting out innings MSC, to optimize switching carrier.

5. method as claimed in claim 4, it is characterized in that, if after finishing switching, because the needs of service logic, requirement cuts out innings MSC and is arranged in bearer path, then cut out innings MSC divide respectively be used in and the MSC of incision office and and call out and to set up the required bearing resource of carrying between the opposing party place MSC, and, be arranged in bearer path so that cut out innings MSC respectively with the MSC of incision office and call out the opposing party place MSC and carry out media re-negotiation.

6. method as claimed in claim 5 is characterized in that, described finishing requires to cut out the needs that innings MSC is arranged in bearer path corresponding service logic after the switching again and comprise: the interim playback demand that cuts out innings MSC.

7. method as claimed in claim 4, it is characterized in that, after the described step B and the switchback operation taken place before taking out stitches, then comprise step: the former score of the game that cuts out is used in and calls out the required bearing resource of foundation carrying between the MSC of the opposing party place, and with the SDP information of this bearing resource correspondence with call out the opposing party place MSC and carry out media re-negotiation, to set up the former bearer path that cuts out between office and the calling the opposing party place MSC.

8. method as claimed in claim 4 is characterized in that, after the described step B and third party's operation has taken place to switch to before taking out stitches, then comprises the following steps:

9. method as claimed in claim 8 is characterized in that, after described step C1, the former incision MSC of office carries out by the Access Network indicating terminal and switches, and the former afterwards incision MSC of office discharges Radio Resource.

10. method as claimed in claim 8 is characterized in that, after described step C1, discharges and former innings MSC and the relevant bearing resource of the former incision MSC of office of cutting out, to optimize switching carrier.

11. as each described method of claim 1 to 10, it is characterized in that, before beginning switching,, select whether to optimize switching carrier according to the needs of service logic.

12. method as claimed in claim 11 is characterized in that, as if the needs according to service logic, selects not optimize switching carrier, then replaces the ISUP signaling to finish the foundation of switching carrier with the SIP-I signaling, is anchored in the bearer path so that cut out innings MSC.

13. method as claimed in claim 12 is characterized in that, described selection is not optimized switching carrier corresponding service logic and is comprised: if the switch sides user is monitored cutting out innings MSC; Or this user carries out communication with data service, is assigned IWF resource IWF cutting out innings MSC; Or cut out innings MSC decision will be to user's playback.

14. a method of setting up switching carrier is characterized in that, comprises the following steps: