CN101742470A

CN101742470A - Implementation method, device and system of BSS local exchange

Info

Publication number: CN101742470A
Application number: CN200810174892A
Authority: CN
Inventors: 秦钧; 王之曦
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2008-11-11
Filing date: 2008-11-11
Publication date: 2010-06-16
Anticipated expiration: 2028-11-11
Also published as: BRPI0921762A2; WO2010054586A1; CN101742470B

Abstract

The embodiment of the invention discloses implementation method, device and system of base station subsystem BSS local exchange. The method comprises the following steps of: informing a BSC to establish local exchange for terminals in a conversation; and receiving a local exchange completion message returned by the BSC, wherein the local exchange is identified by current call identifiers or local exchange identifiers of the two terminals. By applying the technical scheme provided by the embodiment of the invention, the control on the implementation process of the local exchange is realized, the full control on the local exchange is achieved, the controllability of call services is increased, and the effect of saving resources is achieved by controlling and establishing the local exchange.

Description

A kind of implementation method of BSS local exchange, device and system

Technical field

The present invention relates to communication technical field, particularly relate to implementation method, device and the system of the local exchange of a kind of BSS.

Background technology

The BSS local exchange can further be subdivided into BSC local exchange and BTS local exchange.

The local exchange of BSC is meant that a pair of calling (calling and called) all is positioned at the scope of same BSC, and BSC will call out by certain decision algorithm, the BSC local loopback of having ready conditions and carrying out the calling and called voice, the long-distance or local transfer resource of saving Ater Interface.

The local exchange of BTS is meant, a pair of calling (calling and called) all is positioned at the scope of same BTS (group), BSC control to calling out the loopback that carries out with good conditionsi on the group of the BTS that converges, is saved the local or long-distance resource of BTS to Abis interface and the Ater Interface of BSC with this.

Above-mentioned " having ready conditions " be meant that speed that the caller in a scope, called both sides must encoding and decoding speechs is consistent and could start loop fuction, caller under the AMR mode, calledly also must guarantee the code rate unanimity.

If BSC has started local exchange, then just voice are carried out loopback to BTS in the BSC side, on the interface board of A interface, core net is realized empty loopback simultaneously.Empty loopback is defined as, and on BSC side A interface single plate, the signal that the A interface circuit that conversation is taken is accepted is left intact, and at transmit port, sends idle frame, is the core net holding circuit to guarantee.

If TC at the core net machine room, is that to adopt direct E1 or STM-1 to carry out directly interconnected generally speaking between TC and the CN, do not take transfer resource.Because the A interface is to belong to standard interface, therefore started after the local exchange function, the BSC system has discharged the transmission of A section and the B section transmission between the transmission of Y section and BSC and the TC and the transmission of Y section between BSC and the BTS, and the circuit that continuation keeps the CN side to take.Having started the local exchange function is transparent to core net, need not CN is carried out any transformation and setting.

Under the situation that has discharged local transmission, also discharged after local exchange starts and this time called out the TC encoding and decoding resource that takies, under this locality exchange ratio condition with higher, can reduce the configuration of TC resource, reduced the construction cost of original equipment.

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

Do not relate to MSC in the existing BSS local exchange scheme, cause MSC can't obtain conversation whether in the information of BSS local exchange, can't realize carrying out effective control of local exchange according to the variation of implementing scene, caused the waste of resource.

Summary of the invention

The embodiment of the invention provides a kind of implementation method, device and system of BSS local exchange, has realized the control to the local exchange implementation procedure.

For achieving the above object, the embodiment of the invention proposes a kind of implementation method of base station sub-system BSS local exchange on the one hand, comprising:

Informing base station controller BSC is that the terminal in the session is set up local exchange;

Receive the local exchange that described BSC returns and finish message, described local exchange identifies by described terminal current call identification or local exchange.

On the other hand, the embodiment of the invention also proposes a kind of implementation method of BSS local exchange, comprising:

Receive the local exchange order that moving exchanging center MSC sends;

According to described local exchange command is that two terminals in the session are set up local exchange;

Send local exchange to described MSC and finish message, described local exchange identifies by described two terminals current call identification or local exchange identification.

On the other hand, the embodiment of the invention also proposes a kind of MSC, comprising:

Sending module, the terminal that is used for informing base station controller BSC and is session is set up local exchange;

Receiver module is used for receiving the local exchange that described BSC returns and finishes message, and described local exchange identifies by call identification or the local exchange of described two terminals.

On the other hand, the embodiment of the invention also proposes a kind of BSC, comprising:

Receiver module is used for receiving the local exchange order that MSC sends;

Judge module is used for judging whether to set up the corresponding local exchange of local exchange order that described receiver module receives;

Set up module, be used for when described judge module judges that can set up described this locality exchanges, according to the local exchange command that described receiver module received is that two terminals in the session are set up local exchange, and described local exchange identifies by the call identification or the local exchange identification of described two terminals;

Sending module is used for sending local exchange to described MSC and finishes message.

On the other hand, the embodiment of the invention also proposes a kind of realization system of BSS local exchange, comprises MSC and BSC:

Described MSC, the terminal that is used for informing base station controller BSC and is session is set up local exchange, and receives the local exchange that described BSC returns and finish message;

Described BSC is used for receiving the notice of setting up local exchange that described MSC sends, and the local exchange order that receives according to described receiver module is that two terminals in the session are set up local exchange, and sends local exchange to described MSC and finish message.

Wherein, described local exchange identifies by the call identification or the local exchange identification of described two terminals.

The technical scheme of the embodiment of the invention has the following advantages, because adopted the implementation method and the device of the local exchange of BSS, thereby, realized control to this locality exchange implementation procedure, reached the realization of this locality exchange has been controlled fully, improve the degree of controllability of call business, and set up local exchange by control and realize resource-effective effect.

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 is done to introduce simply in will describing embodiment below, apparently, accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.

Fig. 1 is the schematic flow sheet of the implementation method of the local exchange of a kind of BSS in the embodiment of the invention one;

Fig. 2 is the schematic flow sheet of the implementation method of the local exchange of a kind of BSS in the embodiment of the invention two;

Fig. 4 is the schematic flow sheet that local exchange is specified in the foundation in the embodiment of the invention three;

Fig. 5 is the schematic flow sheet that Signalling exchange in the process of local exchange is specified in the foundation in the embodiment of the invention three;

Fig. 6 sets up the schematic flow sheet of Signalling exchange in the process of a plurality of local exchanges for the batch in the embodiment of the invention three;

Fig. 7 is the schematic flow sheet that the BSC request MSC in the embodiment of the invention four triggers local exchange;

Fig. 8 is the schematic flow sheet that the BSC request MSC in the embodiment of the invention four triggers local exchange;

Fig. 9 is the BSC request MSC in the embodiment of the invention four when triggering local exchange, confirms to set up the schematic flow sheet that local exchange and refusal are set up local exchange;

Figure 10 is the BSC request MSC in the embodiment of the invention four when triggering local exchange, and refusal is set up the schematic flow sheet that local exchange and refusal are set up local exchange;

Figure 11 is the schematic flow sheet that MSC order BSC carries out local exchange behind the calling normal talking in the embodiment of the invention five;

Figure 12 sets up the schematic flow sheet of local exchange when setting up for the conversation in the embodiment of the invention six;

Figure 13 is the schematic flow sheet that creates local exchange when switching in the BSC in the embodiment of the invention seven;

Figure 14 is the schematic flow sheet that creates local exchange when switching in the BSC in the embodiment of the invention eight;

Figure 15 is the schematic flow sheet that creates local exchange when switching between BSC in the embodiment of the invention nine;

Figure 16 is the schematic flow sheet that local exchange is removed in the normal call in the embodiment of the invention ten when discharging;

Figure 17 is the schematic flow sheet that local exchange is removed in the BSC request call in the embodiment of the invention 11 when discharging;

Figure 18 is the schematic flow sheet that the MSC order BSC in the embodiment of the invention 12 removes local exchange;

Figure 19 is the schematic flow sheet that the MSC order BSC in the embodiment of the invention 12 removes Signalling exchange in the local exchange process;

Figure 20 is that the schematic flow sheet of specifying local exchange is removed in the BSC request in the embodiment of the invention 13;

Figure 21 removes the schematic flow sheet of local exchange in batches for the request of the BSC in the embodiment of the invention 14;

Figure 22 is the schematic flow sheet of removing local exchange when switching in the BSC in the embodiment of the invention 15;

Figure 23 is the schematic flow sheet of removing local exchange when switching between BSC in the embodiment of the invention 16;

Figure 24 is the schematic flow sheet with call identification indication removing local call in the embodiment of the invention 17;

Figure 25 is the schematic flow sheet with local exchange sign indication removing local call in the embodiment of the invention 18.

Embodiment

Local exchange herein refers to: for the caller of same session and called, if be positioned at the calling of same BSS, in BSS, finish conversation UP (User Plane, user's face) loopback of link, the speech data that is user's face does not flow out this BSS, thereby realize the saving of special interface transfer resource, and reduce time delay.Accordingly, for all callings in same BSS of calling both sides, be referred to as local call herein.

According to the difference of user's face link loopback position, this locality exchange and the interior this locality of BSC that local exchange can be divided into again in the BTS exchange two classes.For this locality in BTS exchange, calling both sides is positioned at same BTS (BTS bunch, for the situation of BTS cascade), the loopback of voice link occur in corresponding BTS (bunch) in.By set up BTS (bunch) in this locality exchange, can realize saving to Abis and the defeated resource of A oral instructions.For this locality in BSC exchange, calling both sides is positioned at same BSC, but different BTS (bunch) in, the voice link loopback occurs among the corresponding BSC.By setting up this locality exchange in the BSC, can realize saving to the defeated resource of A oral instructions.

The work of call manager is at present all concentrated by MSC and is finished.Local call is the special calling of a class, so its administrative mechanism, namely local exchange also should be coordinated finish by MSC, is convenient to supplementary service, the call manager after switching.The foundation of local exchange, releasing and recovery are determined by MSC, are convenient to also realize that local exchange is to the support of existing supplementary service.Under some specific scenes, BSS can propose to set up and remove the request of local exchange, but final decision is still done by MSC.

For MSC, only need to know the local exchange that takes place in the BSS, and specifically be local exchange or the interior local exchange of BSC in the BTS that MSC need not to be concerned about.And the session both sides are that user's face exchanges in BSS side this locality, and both sides' chain of command connects (being signaling link) still to be kept between BSC and MSC, and the all-calls management is still controlled by MSC.

Consider that present A interface is the open interface of a standard, and the privately owned interface of Abis mouth on having come true, the technical scheme that the embodiment of the invention proposed will only be paid close attention to flow process, message and the cell of A interface and local exchange correlation.Therefore, in the technical scheme that the embodiment of the invention proposed,, but its unified this locality that is considered as in the BSS is exchanged this locality exchange and the exchange of not distinguishing in the BTS of this locality in the BSC.For specifically being which kind of local exchange, BSC can make further and accurately judging.As for concrete judgment mechanism, relate to the inside realization of BSC and the Signalling exchange of Abis interface, this paper will not discuss.

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 is obtained under the creative work prerequisite.

As shown in Figure 1, the implementation method of the local exchange of a kind of BSS that the embodiment of the invention one is proposed comprises:

Step S101, MSC notice BSC is that the terminal in the session is set up local exchange.

Concrete advice method is: to notify BSC be that terminal in the session is set up local exchange to MSC by send local exchange command to described BSC.

Concrete, according to the difference of implementation scene, the implementing procedure of this step comprises following dual mode, is described as follows:

Mode one, MSC are to the local exchange command of BSC transmission at a terminal in the session, the pairing identification information of session distant terminal of carried terminal in the order.

In the case, the handling process of BSC side may further comprise the steps:

Described BSC is according to the signaling link identification terminal that sends described local exchange command;

BSC is according to the session distant terminal of identification information identification terminal;

When BSC does not have the code conversion function, BSC returns the pairing session of terminal at the BSC side ring, discharge the resource (as A interface user plane transfer resource) that user's face of pairing two terminals of session does not re-use, and return local exchange at a terminal in the session and/or another terminal and finish message;

When BSC has the code conversion function, whether the voice coding type of judging two terminals that session is corresponding is consistent, if the voice coding type of two terminals is consistent or negotiable consistent, BSC returns the corresponding session of terminal at the BSC side ring, the resource that user's face of corresponding two terminals of releasing session does not re-use (such as A interface user plane transfer resource), and return local exchange for a terminal in the session and/or another terminal and finish message, if the voice coding Type-Inconsistencies of two terminals, BSC determines that the corresponding session of terminal can not set up local exchange, and return the local exchange failed message, local exchange is set up failure.

Mode two, MSC send the local exchange order of carrying out in batches to BSC, carry the session list that need to set up local exchange in the order.

Wherein, need to set up two corresponding identification informations of terminal that list item in the session list of local exchange is specially each session, or the corresponding IMSI information of two terminals of each session.

Concrete, the pairing identification information of above-mentioned terminal is according to being specially:

When terminal active user face was set up in the time division multiplexing tdm mode, the pairing identification information of terminal was specially calling/examples of circuits sign indicating number CIC identification information.

Concrete, if during the current use of the A interface user plane TDM transmission means of a certain calling, identify this calling with CIC between MSC, BSC; After this locality exchange was set up successfully, resource and the transmission of A interface in order to save core net discharged this CIC; Only local exchange needs to remove in session maintenance process, then redistributes a new CIC or IP end points for this calling.

When terminal active user face is set up in the IP mode, the pairing identification information of terminal be specially call identification Call Identifier information or terminal at user's face IP address information of BSC side and/or described user terminal in user's face IP of MSC side address information.

Concrete, if during the current use of the A interface user plane IP transmission means of a certain calling, identify this calling with Call Identifier between MSC, BSC; After local exchange was successfully established, resource and the transmission of A interface in order to save core net discharged this Call Identifier; Only local exchange needs to remove in the session keep-process, then redistributes new Call Identifier or a CIC for this calling.

In the case, the handling process of BSC side may further comprise the steps:

BSC carries out local exchange to each session in the session list and sets up operation;

When BSC carried out this locality exchange foundation operation to last session in the session list after, BSC returned and comprises this locality exchange request-reply that exchanges the tabulation of successfully tabulating and/or fail with the corresponding this locality of session list.

Further, MSC is according to successful local exchange list, keeps the signaling link of corresponding session, discharges user's face resource of the corresponding corresponding terminal of session.

Further, before this step, the triggering flow process that also comprises the local exchange Establishing process, set up the object difference of operation according to triggering local exchange, also comprise following three kinds of situations, wherein, situation one is the Establishing process that MSC determines and trigger local exchange voluntarily, situation two and situation three are the Establishing process that BSC triggers local exchange, are described as follows:

Situation one, MSC determine that two terminals in the session are positioned at same BSS.

Wherein, the difference according to determining foundation is divided into following several situation, specifically comprises:

1, MSC determines according to the pairing BSC information of terminal that the SCCP link obtains the session two ends.

When the corresponding same BSC of the terminal at session two ends, MSC determines that two terminals in the session are positioned at same BSS.

Concrete, at the beginning of setting up calling under the BSS, BSC is connected with MSC must set up the SCCP connection, be used for mutual BSSAP message (being divided into BSSMAP message and DTAP message two classes) between BSC, MSC, MSC can connect by SCCP and obtain opposite end BSC, and MSC just can know that whether two users in the same session are under the same BSS like this.

2, entrained cell ID is determined in the information that reports according to the BSC under pairing two terminals of session of MSC.

When the BSC under cell ID is represented terminal was same BSC, MSC determined that two terminals in the session are positioned at same BSS.

Concrete, in the practical application scene, MSC can determine according to the cell ID that carries in the BSSMAP message:

In MSC, preserve all residential quarters (Cell) of its management and the corresponding relation of its affiliated BSC.This information is kept among the MSC in the mode of configuration data.

In the process of call setup, COMPLETE LAYER 3 INFORMATION that MSC reports by the BSC under the calling party fully in layer three message with " CellIdentifier " cell in the cell ID that carries, inquire the BSC under the calling party.

In handoff procedure, MSC by in the HANDOVER REQUIRED message of analyzing former BSC and reporting with Cell-ID List cell, the Target cell that selected user is switched is further found the BSC at switching target small area place.

The comprehensive session both sides' of MSC BSC, and then can determine whether calling both sides belongs to same BSS.

3, MSC reports complete layer three message that realize behind the normal talking and Assignment Complete to assign to finish message according to BSC in the call establishment and respectively the information of the BSS under corresponding two terminals of session is identified.

When the information of the BSS under two terminals was identical, MSC determined that two terminals in the session are positioned at same BSS.

4, when in corresponding two terminals of this session one or both takes place to switch in BSC, the BSS information under the handoff completion message of the corresponding terminal of this session that MSC reports according to BSC or the handoff completion message identification terminal of two terminals.

When the information of the BSS under the terminal was identical, MSC determined that two terminals in this session are positioned at same BSS.

When the BSC under handoff completion message is represented pairing two terminals of session was same BSC, MSC determined that two terminals in the session are positioned at same BSS.

5, when in corresponding two terminals of session one or both takes place to switch between BSC, the BSS information under the handoff completion message identification terminal that the handoff completion message that MSC reports according to the purpose BSC of a terminal in two terminals or the purpose BSC of two terminals report respectively.

When the information of the BSS under two terminals was identical, MSC determined that two terminals in this session are positioned at same BSS.

Situation two, MSC receive local exchange candidate's query requests that BSC sends.

1, when this locality exchange candidate query requests comprised the A interface type that BSC wishes to save, step S101 was specially:

MSC sends the local exchange order to BSC, and order BSC has used the terminal in the session of A interface type to set up local exchange.

2, when comprising in the local exchange candidate query requests that BSC wishes the quantity of the local exchange set up, step S101 is specially:

MSC is by the retrieval session list corresponding with BSC, obtains the session aggregation of wishing the session that can set up local exchange of the quantity that the quantity of the local exchange set up is complementary with BSC;

MSC sends the local exchange order corresponding with each session in the session aggregation of obtaining to BSC, and order BSC sets up local exchange for two terminals in each session.

3, when comprising in the local exchange candidate query requests that BSC wishes that the quantity of the local exchange set up and BSC wish to set up the candidate list of local exchange, step S101 is specially:

MSC obtains the session aggregation of wishing the session that can set up local exchange of the quantity that the quantity of the local exchange set up is complementary with BSC by the retrieval candidate list;

Further, corresponding above-mentioned 2 and 3 two kind of situation when sent the local exchange order corresponding with last session in the session aggregation of obtaining to BSC after, also comprise in the method that the embodiment of the invention proposes:

MSC sends the local exchange candidate answer that comprises the local exchange order quantity that has sent to BSC.

Situation three, MSC receive the local exchange query requests that BSC sends.

When the local exchange query requests comprised the A interface type that BSC wishes to save, step S101 was specially:

Further, when this locality exchange of asking when this this locality exchange query requests can not be set up, this situation also comprised:

MSC sends the local exchange refuse information to BSC, and refusal is set up the local exchange that the local exchange query requests is asked.

The local exchange that step S102, MSC reception BSC returns is finished message, and local exchange identifies by call identification or the local exchange of two terminals.

Wherein, call identification or the local exchange of local exchange by two terminals identifies and is specially:

Generate the call identification or the local exchange identification of two terminals, when when BSC sends local exchange command, carry the call identification or the local exchange identification of two terminals by local exchange command, this locality exchange of setting up according to local exchange command is identified; Or,

When receiving local exchange that BSC returns and finish message, receive local exchange and finish call identification or the local exchange sign of two terminals that generated by BSC of carrying in the message, the local exchange of foundation being finished by call identification or the local exchange sign of two terminals identifies.

Further, as follows to above-mentioned call identification and local exchange identifier declaration:

1, call identification

Under the AoIP situation, Call Identifier connects by the IP that existing 3GPP R8 standard is defined as a specific A interface user plane, promptly AoIP calling party face be connected MSC and BSC side the IP address to current by unique the deciding of Call Identifier value, that is to say that this calling changes at the end points of MSC, BSC either side, just must indicate with a new Call Identifier value.Call Identifier value does not discharge simultaneously, and then the corresponding IP address of MSC, BSC side can not discharge, and can not be called out by other at least and use.

Because after session set up the local exchange of user's face in the BSS side, in order to guarantee the real release of A interface user plane transmission, namely CIC discharges during the TDM mode, and during the IP mode IP address to also discharging with Call Identifier; At this moment for a calling, MSC is connected only link with BSC be exactly that the SCCP of chain of command connects, in case SCCP connects disconnected, then BSC, the MSC side among both has found fault but can't notify the other side's network element to discharge which calling, therefore a calling in BSS side and another call setup local exchange, the call identification numerical value that this calling of unique identification must be arranged between MSC, BSC, for another calling in the same session also distributes a uniquely identified call identification numerical value, be used for the abnormality processing of call business simultaneously.Can remove or call out and discharge the life cycle of this call identification for this locality exchange be established to local exchange, or MSC and BSC know that the other side supports under the local function of exchange situation, and can discharge to calling out the life cycle of this call identification for call setup.

The side that this sign can be used for MSC, BSC finds fault and must call release the time, a party sends the call cleared message that SCCP does not have connection type, carries unique call identification numerical value of the calling that will discharge in the message.

The Call Identifier that has now in the AoIP standard can certainly be expanded to the call identification use.

2, local exchange identification

Because after session set up the local exchange of user's face in the BSS side, in order to guarantee the real release of A interface user plane transmission, namely CIC discharges during the TDM mode, and during the IP mode IP address to also discharging with Call Identifier; At this moment for a calling, MSC is connected only link with BSC be exactly that the SCCP of chain of command connects, in case that SCCP connects is disconnected, then BSC, the MSC side among both has found fault but can't notify the other side's network element which discharges and call out, therefore need to a sign.

Consider the both sides' of local call binding relationship, namely a side discharges and to mean that the opposing party calls out and also need synchronously to discharge, therefore can be with this local call of local exchange identification number value representation unique between MSC, a BSC.Can remove or call out and discharge the life cycle of this call identification for: local exchange is established to local exchange.

When this sign can be used for the side discovery fault of MSC, BSC and must discharge local call, a party sent the removing message that SCCP does not have connection type, carried unique local exchange sign numerical value of the local call that will discharge in the message.

Further, after step S102 finished, this method also comprised:

MSC keeps the signaling link of session, and discharges corresponding other resources of this session.

So far, finished the Establishing process of local exchange.

Further, after setting up flow process, the embodiment of the invention has also proposed corresponding local exchange and has removed flow process, removes the reason difference of operation according to triggering local exchange, is divided into following several situation:

1, normal call discharges

When with session in two terminals finish when discharging negotiations process, may further comprise the steps:

At terminal, MSC sends clear command to BSC, and order BSC discharges the Radio Resource of terminal;

Message is finished in the removing that receives the terminal of BSC transmission;

Receive the removing request that BSC sends for corresponding another terminal of the session that goes out according to terminal recognition;

At another terminal, send clear command to BSC, order BSC discharges the Radio Resource of another terminal;

Message is finished in the removing that receives another terminal of BSC transmission, finishes the release to the local exchange of session.

2, the BSC request call discharges

When BSC determines with the corresponding first terminal disconnecting of session, may further comprise the steps:

Discharge negotiation with corresponding second terminal of session;

When release is consulted to finish, for the first terminal in the session or second terminal, send clear command to BSC, order BSC discharges the Radio Resource of first terminal or second terminal;

Receive first terminal of BSC transmission or the removing of second terminal and finish message;

Receive the removing request that BSC is sent at pairing second terminal of session that goes out according to first terminal or second terminal recognition or first terminal;

At second terminal or first terminal, send clear command to BSC, order BSC discharges the Radio Resource of second terminal or first terminal;

Receive second terminal of BSC transmission or the removing of first terminal and finish message, finish the release to the session of local exchange.

3, MSC order BSC removes local exchange

When MSC determines that pairing two terminals of session need be removed local exchange, specifically may further comprise the steps:

According to the current speech type of coding and the A interface transfer resource of pairing two terminals of session, be pairing two corresponding resources of terminal distribution of session and end points;

For the corresponding terminal of session, send local exchange to described BSC and remove order, local exchange is removed in the order and is included as corresponding two terminal point information that terminal is distributed of session, and order BSC removes the local exchange of corresponding two terminals of session;

When BSC removes successfully to local exchange, the local exchange that reception BSC returns is removed and is finished message, local exchange is removed and is finished the terminal point information that comprises corresponding two terminals of session in the message, and according to terminal point information, the A interface user plane of connecting corresponding two terminals of session connects; When BSC removes failure to local exchange, receive the local exchange releasing failed message that BSC returns, be released to corresponding resource and the end points of corresponding two terminal distribution of session, keep local exchange.

Further, mentioned BSC removes the local exchange of corresponding two terminals of session in the above-mentioned flow process, specifically comprises following flow process:

BSC receives the local exchange that sends for the corresponding terminal of session and removes order, and local exchange is removed in the order and is included as corresponding two terminal point information that terminal is distributed of session;

BSC is corresponding two the terminal distribution resources of session and end points according to terminal point information.

When being allocated successfully, BSC returns for the local exchange releasing of the corresponding terminal of session and finishes message, and local exchange is removed to finish and comprised the terminal point information that BSC is corresponding two terminal distribution of session in the message; When distributing failure, BSC returns local exchange and removes failed message.

Wherein, in the step of above-mentioned BSC Resources allocation, concrete allocation flow is divided into following two kinds of situations:

When the terminal point information of distributing for corresponding two terminals of session that (1) comprises in the received local exchange releasing of BSC is ordered is TDM termination information, BSC is two CIC signs that terminal distribution is identical, removes to finish in the local exchange of returning and does not carry the CIC sign that BSC is two user assignments in the message.

When the terminal point information of distributing for corresponding two terminals of session that (2) comprises in the received local exchange releasing of BSC is ordered is the IP terminal point information, BSC is the IP end points of two terminal distribution pairings, removes to finish in the local exchange of returning and carries the IP terminal point information that BSC is two user assignments in the message.

4, local exchange is removed in the BSC request

When MSC receives the local exchange releasing request of BSC transmission, specifically may further comprise the steps:

When local exchange is removed request for the local exchange of appointment, remove the local exchange of appointment;

Removing request when local exchange is specially and comprises local exchange that BSC wishes to remove the quantity of local exchange and remove the candidate when asking, by the tabulation of retrieval local exchange, obtain the session aggregation of wishing the session that to remove local exchange of the quantity that the quantity of the local exchange removed is complementary with BSC, send the local exchange corresponding with each session in the session aggregation of obtaining to BSC and remove order, order BSC removes corresponding local exchange;

Removing request when local exchange is specially and comprises BSC and wish to remove local exchange that the quantity of local exchange and BSC wish to remove the candidate list of local exchange and remove the candidate when asking, by the retrieval candidate list, obtain the session aggregation of wishing the session that to remove local exchange of the quantity that the quantity of the local exchange removed is complementary with BSC, send the local exchange corresponding with each session in the session aggregation of obtaining to BSC and remove order, order BSC removes corresponding local exchange.

Wherein, when sent to BSC with the session aggregation of obtaining in the corresponding local exchange of last session remove order after, also comprise sending comprising this locality exchange that has sent and removing this locality exchange of order quantity and remove candidate answer to BSC.

5, switching causes local exchange to be removed in the BSC

To carry out when BSC has determined to set up a terminal in the session of local exchange that BSC is inner to be switched, and when terminal can not be supported local exchange after switching, specifically may further comprise the steps:

Before the inner switching of BSC was carried out, BSC sent and removes the pairing local request that exchanges of terminal, removes local exchange.

6, switching causes local exchange to be removed between BSC

When the terminal that BSC has determined to set up in the session of local exchange will carry out switching between BSC, and when switching the back terminal and can not support local exchange, specifically may further comprise the steps:

7, connecting fault causes local exchange to be removed

When MSC determines that one or both network element in the local exchange breaks down, specifically may further comprise the steps

MSC comprises the call identification of corresponding two terminals of local exchange or the call cleared message of local exchange sign to the BSC transmission;

MSC receives the call clearing response that comprises the local exchange tabulation of removing according to call identification or the local exchange sign of two terminals that BSC sends, and removes corresponding local exchange.

On the other hand, in actual applications, BSC can carry out fault verification too, and after step S103 finished, when BSC determined that one or both network element in the local exchange breaks down, method also comprised:

Receive the call identification that comprises corresponding two terminals of local exchange of BSC transmission or the call cleared message of local exchange sign;

Remove corresponding local exchange;

Send the call clearing response that comprises this locality exchange tabulation of removing according to the call identification or the local exchange identification of two terminals to BSC.

It is pointed out that above-mentioned various situations, after removing local exchange, all comprise the call identification of corresponding two terminals of release local exchange or the flow process of local exchange sign.

Further, based on the local implementation method that exchanges of BSS that the invention described above embodiment one is proposed, as shown in Figure 2, the implementation method of the local exchange of a kind of BSS that the embodiment of the invention two proposes comprises:

Step S201, BSC receive the local exchange command that moving exchanging center MSC sends;

Step S202, BSC are that two terminals in the session are set up local exchange according to the local exchange order;

Wherein, after this step is finished, also comprise:

The signaling link that keeps corresponding session, the resource that user's face of the pairing terminal of release session does not re-use.

Step S203, BSC send local exchange to MSC and finish message, and local exchange identifies by two current call identification or local exchanges of terminal.

Further, after MSC transmission local exchange is finished message, also comprise:

When determining to interrupt with being connected of the pairing terminal of session, send message to MSC, this locality that makes MSC remove the pairing session of terminal exchanges; Or,

A terminal in the session of determining to set up local exchange will carry out that BSC is inner to be switched, and when terminal can not be supported local exchange after switching, sends the request of removing the corresponding local exchange of terminal to MSC, makes MSC remove local exchange; Or,

A terminal in the session of determining to set up local exchange will carry out switching between BSC, and when terminal can not be supported local exchange after switching, sends the request of removing the corresponding local exchange of terminal to MSC, makes MSC remove local exchange.

Wherein, remove after the local exchange, also comprise:

Discharge the call identification or the local exchange identification of pairing two terminals of local exchange.

Further, said method also comprises:

Send local exchange candidate query requests to MSC, or the local exchange query requests, trigger MSC and send the local exchange order.

Further, based on the local implementation method that exchanges of BSS that the invention described above embodiment is proposed, as shown in Figure 3, the embodiment of the invention three has proposed the structural representation of the realization system of the local exchange of a kind of BSS, and this system specifically comprises MSC 1 and BSC 2:

MSC 1 is used for notice BSC 2 and sets up local exchange for the terminal of session, and the local exchange that reception BSC 2 returns is finished message;

Further, MSC 1 also orders for removing to BSC 2 transmission local exchanges, and order BSC 2 is two terminals releasing local exchanges in the session, and receives the local exchange releasing response that BSC 2 returns, and concrete, MSC 1 comprises:

Sending module 11 is used for notice BSC 2 and sets up local exchange for the terminal of session;

Receiver module 12 is finished message for the local exchange that reception BSC 2 returns, and local exchange identifies by call identification or the local exchange of two terminals.

Further, MSC 1 also comprises one or more with in the lower module:

Processing module 13 is used for receiving after local exchange finishes message at receiver module 12, keeps the signaling link of two terminals of session, discharges other resources of pairing two terminals of session;

Determination module 14 is used for determining whether two terminals of session are positioned at same BSS, when two terminals in judging session are positioned at same BSS, makes sending module 11 send local exchange command to BSC 2.

BSC 2, be used for to receive the notice of setting up local exchange that MSC 1 sends, and for two terminals in the session are set up local exchange, and send local exchange to MSC and finish message.

Further, BSC 2 also be used for to receive the local exchange that MSC 1 sends and removes order, is that two terminals in the session are removed local exchanges according to the local exchange order that receives, and sends local exchange to MSC 1 and remove response, comprising:

Receiver module 21 is used for receiving the notice of setting up local exchange that MSC sends;

Judge module 22 is used for judging whether setting up that receiver module 21 receives sets up the corresponding local exchange of notifying of local exchange;

Set up module 23, judge module 22 judgements are used for when can be set up local exchange, the notice of setting up local exchange that receives according to receiver module 21 is that two terminals in the session are set up local exchange, and this local exchange identifies by call identification or the local exchange of two terminals;

Sending module 24 is used for sending local exchange to MSC and finishing message after setting up module 24 and setting up local exchange, further, also is used for sending local exchange candidate query requests to MSC, or the local exchange query requests, trigger MSC and send the local exchange order.

Further, BSC 2 also comprises:

Processing module 25 is used for keeping the signaling link of corresponding session, the resource that user's face of the pairing terminal of release session does not re-use after setting up the local exchange of module 23 foundation.

Wherein, local exchange identifies by the call identification or the local exchange identification of two terminals.

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.

Below, further by follow-up embodiment each step of the method that proposes in the embodiment of the invention one is elaborated.

According to different scene, local exchange can carry out in the process in session, set up in the call establishment and during Handover.Below by following embodiment, formulate its relevant this locality exchange according to various scene and set up related signaling message in flow process and the definition flow process.

At first, the flow process of setting up local exchange in the session is described as follows:

The best opportunity of setting up local exchange is in the call setup of the session both sides under the same BSS or switches to enter in the same BSS, but sometimes be subjected to the restriction of resource, supplementary service etc. and missed, then can only in conversation procedure, set up local exchange by MSC notice BSC.

To shown in Figure 6, the MSC that proposes for the embodiment of the invention three orders BSC to set up the schematic flow sheet of local exchange such as Fig. 4.

Wherein, as shown in Figure 4, specify the schematic flow sheet of local exchange for the foundation that is proposed in the embodiment of the invention three.

MSC determines MS 1 and MS 2 in same session, and all under same BSS, namely satisfies the basic demand of setting up local exchange.

Step S401, MSC send the Local SwitchCommand message of SCCP connection type to BSC at MS 2.

Certainly, can send above-mentioned message for MS 1, such variation does not affect protection scope of the present invention yet.

Further, the optional cause value that carries in the above-mentioned Local Switch Command message, but must carry the sign of the other user's (being MS 1), and also carry local exchange identification or both sides' call identification, concrete identification means comprises:

A) if current MS 1 user's face is set up in the TDM mode, then use current CIC number of MS 1;

B) if current MS 1 user's face set up in the IP mode, then use Call identifier numbering or MS 1 user's face at user's face IP address information of BSC side and/or MS 1 user's face in user's face IP of MSC side address information;

Step S402, BSC go out corresponding user MS 1 according to the other user's who carries in the Local Switch Command message identification (RNC-ID) analytic.

When BSC does not have TC (code conversion) function, execution in step S403 then;

When BSC has the TC function, execution in step S405 then.

Step S403, BSC are to MS1 and the corresponding session establishment local exchange of MS2.

BSC is connected user's face of MS 1 and MS 2 directly and returns at the BSC side ring, discharges MS1 and the MS 2 associated user's face resource on the A interface simultaneously, at MS 2 and/or send the Local Switch Complete message of SCCP connection type to MSC at MS 1.

Speech coding type after needing to carry variation in this Local Switch Complete message if the speech coding type of MS1 or MS2 changes.

If MSC does not carry local exchange sign or both sides' call identification in Local Switch Command message, then must carry local exchange sign or both sides' call identification in the Local Switch Complete message.

After step S404, MSC received Local Switch Complete message, the judgement local call was set up successfully, discharges this side MS 1 and MS 2 related resources, comprised the transmission of A interface user plane.

Step S405, BSC judge whether the speech coding type of MS 1 and MS 2 is consistent.

If the voice coding type of MS 1 and MS 2 is consistent or the energy is consensus, then execution in step S403;

If the speech coding Type-Inconsistencies of MS 1 and MS 2 and can not be consensus, then execution in step S406.

Step S406, BSC judge that finally MS 1 and MS 2 can not set up local call, at MS2 and/or at the Local Switch Failure message of MS 1 to MSC transmission SCCP connection type, carry concrete failure reason value in the message.

After step S407, MSC receive Local Switch Failure message, judge local call foundation failure, keep this side MS 1 and MS 2 related resources, comprise the transmission of A interface user plane, MSC can follow-uply reattempt order BSC MS 1 and MS 2 are set up local exchange.

Corresponding above-mentioned flow process as shown in Figure 5, is specified the schematic flow sheet of Signalling exchange in the process of local exchange for the foundation that proposes in the embodiment of the invention three.

Wherein, as shown in Figure 6, set up the schematic flow sheet of Signalling exchange in the process of a plurality of local exchanges for the batch that proposes in the embodiment of the invention three.

Step S601, MSC indication BSC carries out local exchange in batches, send the connectionless Local Switch of SCCP Request message to BSC, carried the session list that requires to set up local exchange in this message, in the tabulation each is relevant two users of each session with current user's face Endpoint ID, or represents with two users' IMSI;

After step S602, BSC received this message, the local exchange of these sessions of batch process was set up.

Step S603, BSC return a connectionless Local Switch of SCCP of MSC Request Acknowledge message after handling last session, carry successful list and/or the failed list of setting up local exchange in the message, MSC is according to successful list indication release associated user's resource and end points.

To shown in Figure 10, the BSC request MSC that proposes for the embodiment of the invention four triggers the schematic flow sheet of local exchange such as Fig. 7.

When BSC finds the transfer resource shortage of self, can ask MSC to trigger the local exchange flow process.

Specific implementation has following 3 kinds:

1) mode A

Particular flow sheet may further comprise the steps as shown in Figure 7:

Step S701, BSC send the Local SwitchCandidate Enquire message that SCCP does not have connection type to MSC, the optional concrete reason value of carrying in the message, can also further indicate BSC to wish the A interface type of saving (being AoIP or AoTDM) in the message, notice MSC attempts setting up local exchange to the session under this BSS.

After step S702, MSC received this Local Switch Candidate Enquire message, local swap operation was set up in pairing each session successively to the A interface.

In this step, MSC does not need to the corresponding response message of BSC feedback, but directly inquire about session under this BSC, specify the local method that exchanges according to the foundation that is proposed in the embodiment of the invention three, send the local exchange of Local Switch Command message trigger to BSC at user in each session.

Further, MSC can according to the A interface type in the Local Switch Candidate Enquire message of receiving, trigger local exchange to the session of having used this interface type.

2) mode B

Particular flow sheet may further comprise the steps as shown in Figure 8:

Step S801, BSC send the Local SwitchCandidate Enquire message that SCCP does not have connection type to MSC, carry BSC in the message and wished to set up the number of local exchange and/or the candidate list that local call is set up in hope, the optional concrete reason value of carrying, notice MSC attempts setting up local exchange to the session under this BSS.Wherein each in the candidate list is defined as user's face Endpoint ID of session one side.

Step S802, MSC judge the session that can set up local exchange, and send corresponding local exchange command respectively to BSC.

If only carry the number that BSC wishes to set up local exchange in the Local Switch Candidate Enquire message, MSC checks session list, the number that requires according to BSC as far as possible finds the calling that can set up local exchange, and send Local Switch Command message for the side user in each session respectively to BSC, according to the method for the foundation appointment local exchange that proposes in the embodiment of the invention three, set up local exchange.

If wish to set up the number of local exchange except carrying BSC in the Local Switch Candidate Enquire message, also carried candidate list, then MSC checks that back BSC sends Local Switch Command message for the side user in each session respectively, according to the method for the foundation appointment local exchange that proposes in the embodiment of the invention three, set up local exchange.

Step S803, MSC return local exchange candidate response to BSC.

After sending to the relevant Local Switch Command message of last session, MSC sends the Local Switch Candidate Response response message that a SCCP does not have connection type to BSC, carried the Local Switch Command message number that MSC sends in this message, the local exchange of namely processing is set up the indication number.

3) mode C

Particular flow sheet represents respectively to confirm to set up local exchange and the flow process of refusing to set up local exchange as shown in Figure 9 and Figure 10, may further comprise the steps:

If step S901, BSC find the A interface of self transmit a side in anxiety comparatively or the session take place that BSC is inner and switch after and can set up local exchange the time, send the Local Switch Enquire message that a SCCP does not have connection type to MSC, can carry concrete reason value and concrete nervous A interface type in the message.

After step S902, MSC receive this message, search the suitable session that can in BSS, set up local exchange, set up the method for local exchange according to the batch that proposes in the embodiment of the invention three, set up local exchange and carry out in batches the local exchange flow process.

Step S903, BSC return local exchange request response to MSC, comprise successful list and/or failed list that local exchange is set up in this request.

As shown in figure 10, if after MSC receives this message, when refusing for some reason this request, SCCP of MSC loopback does not have the Local Switch Reject message of connection type, can carry concrete Reason For Denial value in the message, or MSC does not just do any replying.

Further, the flow process that creates local exchange in the session establishment process is described as follows:

Setting up local call in the time of session establishment has dual mode, and the one, MSC order BSC carries out local exchange after calling out normal talking, and the 2nd, MSC order BSC carries out local exchange in to called the appointment, specifically describes by following examples.

As shown in figure 11, MSC order BSC carries out the schematic flow sheet of local exchange behind the calling normal talking that proposes for the embodiment of the invention five.

Two users in the session by existing standard flow process continue, ring, connection, user's face is at the core-network side loopback, but comprehensive fully layer three message of MSC and Assignment Complete message are judged the BSS at called MS 2 places in this process, comprehensive fully layer three message and Assignment Complete message are judged the BSS at called MS 1 place, or connect the BSS obtain two users place by two users SCCP, if two users under same BSS, then satisfy the condition of local exchange.

Normally connect in session, the user's face that is two users is in core net successful connection loopback, be that MSC is when called MS 2 sends Connect Acknowledge message, MSC sends the Local Switch Command message of SCCP connection type to BSC at one of them MS (being example with MS 2 in the present embodiment), trigger local exchange and set up process, concrete steps specify the flow process of the method for local exchange to carry out according to the foundation that is proposed in the embodiment of the invention three, and present embodiment is repeated description no longer.

Set up the schematic flow sheet of local exchange when as shown in figure 12, the conversation that is proposed for the embodiment of the invention six is set up.

Two users in the session by existing standard flow process continue, ring, connection, user's face is at the core-network side loopback, but MSC judges the BSS at called MS 2 places according to complete layer three message in this process, comprehensive fully layer three message and Assignment Complete message are judged the BSS at caller MS 1 place, or connect the BSS obtain two users place by two users SCCP, if two users under same BSS, then satisfy the condition of local exchange.

MSC carries local exchange identification or both sides' call identification in the Assignment Request message that issues at MS 2, also must carry the other side MS 1 sign, concrete identification means comprises:

If MSC carries the voice coding type of recommendation then uses with the other side MS 1 and use identical voice coding type in this message simultaneously, also guarantee at least compatibility if can not be consistent.

After BSC receives Assignment Request message, session the other side's sign has been carried in discovery, judge that then MSC requires MS 1 and MS 2 are carried out local exchange, after receiving the Assignment Complete message that MS 2 returns, carry out local exchange, if successfully return AssignmentComplete message, carried the indication that local exchange is successfully established in the message, at this moment user's face of two users connects and to return at the BSS side ring, by this flow operations then MS 1 can't hear the ring-back tone that network issues; If Assignment Complete message is also returned in failure, but carry the indication that local exchange is set up failure in the message, optionally can also further carry the concrete reason value.

MSC receives Assignment Complete message, if comprise the indication that local exchange is successfully established then judge that session successfully sets up local exchange in the BSS side, discharging this side is the related resource that MS 1 and MS 2 distribute, and comprises the transmission of A interface user plane; Otherwise by the existing standard flow process user's face that continues.

Further, the flow process of creating local exchange when switching in the BSC describes as follows:

Create the schematic flow sheet of local exchange when switching in the BSC that proposes for the embodiment of the invention seven as shown in figure 13.

Under the A interface user plane TDM transmission means, session one side (in the present embodiment take MS 2 as example) BSC is inner to be switched, after MSC receives the Handover Performed message that BSC reports, MSC judges the satisfied condition of setting up local exchange of session, then carry out immediately the local exchange flow process, specifically specify the method for local exchange according to the foundation that proposes in the embodiment of the invention three, set up local exchange, execution local exchange after namely switching is finished.

Create the schematic flow sheet of local exchange when switching in the BSC that proposes for the embodiment of the invention eight as shown in figure 14.

Under the A interface user plane IP transmission means, session one side (in the present embodiment take MS 2 as example) BSC is inner to be switched, MSC receives that BSC is after switching the HandoverComplete message that reports when complete, MSC judges the satisfied condition of setting up local exchange of session, then carry out immediately the local exchange flow process, specifically specify the method for local exchange according to the foundation that proposes in the embodiment of the invention three, set up local exchange.Execution local exchange after namely switching is finished.

Further, the flow process of creating local exchange when switching between BSC describes as follows:

Create the schematic flow sheet of local exchange when switching between the BSC that proposes for the embodiment of the invention nine as shown in figure 15.

Session one side MS 2 is BSS 2 times, the opposing party MS 1 is BSS 1 time, MS 2 switchings enter BSS 1 in the communication process, after MSC receives the Handover Complete message that BSC 1 reports, judge coexist BSS 1 time of two users, promptly satisfy local exchange and set up condition, send ClearCommand to BSC 2, and to the Local SwitchCommand message of BSC 1 transmission at arbitrary user's SCCP connection type, promptly specifically specify the method for local exchange, set up local exchange according to the foundation that is proposed in the embodiment of the invention three.

By the technical scheme that adopts the invention described above embodiment three to propose to the embodiment of the invention nine, providing can standardized local exchange method for building up, so that MSC can control calling fully, can in full calling procedure, trigger and set up local exchange, greatly improved the fitness of local exchange to application scenarios, and local exchange is set up rear release or is not set up A mouth circuit, can save A mouth resource, when coding is consistent, also can save Ater mouth resource, realized improving the degree of controllability of call business, and the effect that economizes on resources.

In each above embodiment, the process of setting up that this locality is exchanged has been described in detail, below, the present invention further describes the releasing flow process of local exchange by following examples.

According to different scenes, local exchange can be when calling out release, in the calling procedure, when breaking down, the connection of when calling out switching and this locality exchange or the related network elements of local exchange remove, below by following embodiment, formulate its relevant this locality exchange according to various scene and remove related signaling message in flow process and the definition flow process.

At first, be described as follows calling out the flow process of removing local exchange when discharging:

According to calling out the cause that discharges, further be divided into following several situation:

When discharging, the normal call that proposes for the embodiment of the invention ten as shown in figure 16, removes the schematic flow sheet of local exchange.

After using DTAP message directly to finish release negotiations process (referring to 3GPP TS24.008) between MS and MSC, MSC sends BSSAP CLEAR COMMAND message for MS1, and indication BSC discharges Radio Resource; BSC receives the pairing MS2 that retrieves the MS1 local exchange after this CLEAR COMMAND (MS1) message, send BSSAP CLEAR REQUEST request message for MS2, once remove then MS1 among the BSS and the local exchange of MS2, and discharge corresponding resource.

Annotate: the Cause cell in CLEAR COMMAND, the CLEAR REQUEST message need to increase with local exchange removes corresponding cause value indicated value.

Certainly MSC also can be simultaneously issues Clear Command message at MS 1 and MS 2 to BSC, starts the flow process of removing MS 2 resources and need not send Clear Request message request MSC by BSC, and such variation does not influence protection scope of the present invention.

When discharging, the BSC request call that proposes for the embodiment of the invention 11 as shown in figure 17, removes the schematic flow sheet of local exchange.

Have no progeny in the wireless connections between MS1 and base station, BSC sends BSSAP CLEAR REQUEST request message at MS1 to MSC after detecting fault, after MSC uses DTAP message directly to finish release negotiations process (referring to 3GPP TS 24.008) with MS2, MSC sends BSSAP CLEAR COMMAND message at MS1 (or MS2), and indication BSC discharges Radio Resource; BSC retrieves the local pairing terminal that exchanges sequence number of MS 1 (or MS2) after receiving this message, sends BSSAP CLEAR REQUEST request message at MS2 (or MS 1), and concrete steps as shown in figure 17.

Certainly the reason of BSC transmission BSSAP CLEAR REQUEST request message also has " O andM intervention ", " equipment failure " etc.

Certainly MSC also can be simultaneously issues Clear Command message at MS 1 and MS 2 to BSC, starts the flow process of removing MS 2 resources and need not send Clear Request message request MSC at MS 2 by BSC.

Further, the flow process of removing local exchange in the calling procedure is described as follows:

As shown in figure 18, the MSC order BSC that proposes for the embodiment of the invention 12 removes the schematic flow sheet of local exchange.

When detecting (replenishing) service needed or " O and M intervention " indication etc., MSC requires to remove MS1, the local exchange of MS2 two users under same BSS, user's face of namely calling out must be through the A interface and when MSC realizes exchange, MSC discharges this local exchange for one of them user MS2 (with MS2 listen requirement is arranged, or take MS2 as example as main label the local exchange centering of MS1, MS2) instruction BSC:

Step S1801, MSC judge that MS 1 and MS 2 need to remove local exchange, then earlier according to two users' current speech type of coding in conjunction with A interface transfer resource, distribute relevant resource and end points, send the LocalSwitch Release Command message of SCCP connection type for one of them user (take MS 2 as example) to BSC, carry MSC in the message and be the terminal point information of these MS 2 user assignments, carrying simultaneously MSC is the terminal point information of pairing user MS 1 distribution of MS 2, the optional concrete reason value of removing local exchange of carrying.

After step S1802, BSC received Local Switch Release Command message, trial solution was distributed the resource of correspondence and the end points that mates with MSC except local exchange.

If wherein BSC receives the TDM termination that MSC distributes, then identical CIC gets final product BSC for the user distributes, if but BSC receives the IP end points that MSC distributes, and then BSC is the IP end points of user's distributive pairing.

Further, if BSC Resources allocation and end points success, then execution in step S1803;

If BSC Resources allocation and end points failure, then execution in step S1805.

Step S1803, BSC discharge previous local exchange identification of distributing or both sides' call identification, return MSC at the Local Switch Release Complete message of the SCCP connection type of MS 2 and/or at the Local Switch Release Complete message of the SCCP connection type of MS 1, carry terminal point information or amended terminal point information that BSC distributes for two users.If BSC for the newly assigned A interface type of two users all be the TDM type and CIC number of accepting that MSC distributes, then user's face was connected the A interface and set up this moment, i.e. session is normal in MSC exchange and conversation.

After step S1804, MSC receive Local Switch Release Complete message, terminal point information according to the distribution of BSC side, the A interface user plane of connecting two users connects, be that session is normal in MSC exchange and conversation, discharge previous local exchange identification of distributing or both sides' call identification simultaneously.

Step S1805, BSC keep this locality exchange of this session, return the Local Switch Release Failure message of MSC at the SCCP connection type of MS 2, carry failure reason value.

Step S1806, MSC receive Local Switch Release Failure message, discharge previous resource and the end points that distributes, and keep local call.

Corresponding above-mentioned flow process, as shown in figure 19, the MSC that proposes for the embodiment of the invention 12 orders BSC to remove the schematic flow sheet of Signalling exchange in the local exchange process.

Such as Figure 20 and shown in Figure 21, the schematic flow sheet of local exchange is removed in the BSC request that proposes for the embodiment of the invention 13 and 14.

Need to remove and converse when also needing to keep when BSC finds certain or some local exchanges under it, can ask MSC to trigger and remove the local exchange flow process.Specific implementation has following 2 kinds:

1) mode A

As shown in figure 20, the schematic flow sheet of specifying local exchange is removed in the BSC request that proposes for the embodiment of the invention 13.

BSC sends the Local Switch Release Required message that SCCP does not have connection type to MSC, the optional concrete reason value of carrying in the message, and notice MSC removes local exchange.

After MSC receives this Local Switch Release Required message, do not need to feed back corresponding response message; MSC inquires about the both sides of corresponding local call, specifically specifies the method for local exchange according to the releasing that is proposed in the embodiment of the invention 12, removes this this locality exchange.

2) mode B

As shown in figure 21, the schematic flow sheet of local exchange is removed in the BSC request that proposes for the embodiment of the invention 14 in batches.

BSC sends the Local Switch Release CandidateEnquire message that SCCP does not have connection type to MSC, carried the candidate list that BSC wishes to remove the number of local exchange and/or wishes to remove local call in the message, the optional concrete reason value of carrying, notice MSC removes local exchange to the local call trial solution under this BSS.Wherein each in the candidate list is defined as local exchange identification or session one side's call-sign or IMSI number.

If only carry the number that BSC wishes to set up local exchange in the Local Switch Release Candidate Enquire message, MSC checks session list, the number that requires according to BSC as far as possible finds the calling of setting up local exchange, and send Local Switch Release Command message for the side user in each session respectively to BSC, after sending to the relevant LocalSwitch Release Command message of last session, MSC sends the Local Switch Release Candidate Response response message that a SCCP does not have connection type to BSC, carried the Local Switch Release Command message number that MSC sends in this message, the local exchange of namely processing is removed the indication number.

If wish to remove the number of local exchange except carrying BSC in the Local Switch Release Candidate Enquire message, also carried candidate list, then MSC checks that back BSC sends Local Switch Release Command message for each user respectively, after sending to the relevant Local Switch Release Command message of last session, MSC sends the Local Switch Release Candidate Response response message that a SCCP does not have connection type to BSC, carried the Local Switch Release Command message number that MSC sends in this message, the local exchange of namely processing is removed the indication number.

Further, the flow process of removing local exchange when switching in the BSC describes as follows:

Remove the schematic flow sheet of local exchange when switching in the BSC that proposes for the embodiment of the invention 15 as shown in figure 22.

BSC judges that the side in the local exchange will carry out the inner switching of BSC, and can not guarantee local exchange after switching, then carrying out earlier local exchange before switching removes rear at the execution switching flow, wherein, the BSC request that BSC request local exchange releasing flow process such as the embodiment of the invention 13 propose is removed and is specified the local exchange flow process, and present embodiment is repeated description no longer.

Further, the flow process of removing local exchange when switching between BSC describes as follows:

Remove the schematic flow sheet of local exchange when switching between the BSC that proposes for the embodiment of the invention 16 as shown in figure 23.

Side in the BSC judgement local exchange will carry out between BSC switches, and can not guarantee local exchange after switching, then carrying out earlier local exchange before switching removes rear at the execution switching flow, wherein, the BSC request that BSC request local exchange releasing flow process such as the embodiment of the invention 13 propose is removed and is specified the local exchange flow process, and present embodiment is repeated description no longer.

Further, when the related network elements of the connection of local exchange or local exchange was broken down, the flow process of removing unusual local call was described as follows:

As shown in figure 24, remove the schematic flow sheet of local call for what the embodiment of the invention 17 proposed with the call identification indication.

NE 1, NE 2 are the MSC and the BSC of A interface correspondence, when side in the NE 2 discovery local calls or both sides unusual (disconnected) as the SCCP connection, remove relevant call resources of this network element side and reference number etc., send the connectionless call cleared message of SCCP to the opposite end network element, carry the tabulation of the corresponding call identification of the calling of wanting opposite end network element removing in the message, the optional concrete reason value of carrying.

After NE 1 receives call cleared message, remove call resources and reference number etc. by the tabulation of the call identification in message indication, the connectionless call clearing response message of SCCP of loopback after finishing, the tabulation of carrying the corresponding call identification of the calling that this network element removed in the message.

As shown in figure 25, remove the schematic flow sheet of local call for what the embodiment of the invention 18 proposed with the indication of local exchange sign.

NE 1, NE 2 are the MSC and the BSC of A interface correspondence, when side in the NE 2 discovery local calls or both sides unusual (disconnected) as the SCCP connection, remove relevant call resources of this network element side and reference number etc., send the connectionless call cleared message of SCCP to the opposite end network element, carry the tabulation of the corresponding local exchange identification of the calling of wanting opposite end network element removing in the message, the optional concrete reason value of carrying.

After NE 1 receives call cleared message, remove call resources and reference number etc. by the local exchange identification tabulation indication in the message, the connectionless call clearing response message of SCCP of loopback after finishing is carried the tabulation of the corresponding local exchange identification of the calling that this network element removed in the message.

By the technical scheme that adopts the invention described above embodiment ten to propose to the embodiment of the invention 18, providing can standardized local exchange release method, so that MSC can control calling fully, can in full calling procedure, remove local exchange, greatly improve the fitness of local exchange to application scenarios, when not needing to keep local exchange and maybe can not keep local exchange, removed this local exchange, and keep the corresponding session of this local exchange, ensured professional continuing and stability.

By the technical scheme that adopts the embodiment of the invention to propose, standardized local exchange implementation method is provided, so that MSC can control calling fully, can trigger local exchange or remove local exchange in full calling procedure, local exchange is set up rear release or is not set up A mouth circuit, can save A mouth resource, when coding is consistent, also can save Ater mouth resource, and MSC can remove in needs, recover local exchange, greatly improve application prospect.

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 a 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, module in the accompanying drawing or flow process might not be that enforcement the present invention is necessary.

The above only is a 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. the implementation method of the local exchange of base station sub-system BSS is characterized in that, comprising:

2. the method for claim 1 is characterized in that, described notice BSC is that the terminal in the session is set up local exchange, is specially:

To notify BSC be that terminal in the session is set up local exchange by send local exchange command to described BSC.

3. the method for claim 1 is characterized in that, described informing base station controller BSC is that the terminal in the session is set up before the local exchange, also comprises:

Determine that two terminals in the described session are positioned at same BSS; Or,

Receive this locality exchange candidate query requests that described BSC sends; Or,

Receive this locality exchange query requests that described BSC sends.

4. method as claimed in claim 3 is characterized in that, two terminals in described definite session are positioned at same BSS, are specially:

Connect the pairing BSC information of terminal obtain described session two ends according to SCCP and determine, when the corresponding same BSC of the terminal at described session two ends, determine that two terminals in the described session are positioned at same BSS; Or,

Entrained cell ID is determined in the information that reports according to the BSC under pairing two terminals of described session, when the BSC under described cell ID is represented described terminal is same BSC, determine that two terminals in the described session are positioned at same BSS; Or,

Complete layer three message that report according to the BSC under pairing two terminals of session described in the call establishment and assign and finish message and respectively the information of the BSC under pairing two terminals of described session is discerned, when the information of the BSC under described two terminals is identical, determine that two terminals in the described session are positioned at same BSS; Or,

When the pairing terminal of described session or two terminals take place to switch in the BSC, the handoff completion message of the pairing terminal of described session that reports according to described BSC obtains the BSC under the described terminal, when the BSC under described handoff completion message is represented pairing two terminals of described session is same BSC, determine that two terminals in the described session are positioned at same BSS; Or,

When the corresponding terminal of described session or two terminals take place to switch between BSC, the handoff completion message that reports respectively according to the purpose BSC of described two terminals obtains the BSC under the described terminal, when the BSC under described handoff completion message represents corresponding two terminals of described session is same BSC, determine that two terminals in the described session are positioned at same BSS.

5. method as claimed in claim 3, it is characterized in that, when described local exchange candidate's query requests or described local exchange query requests comprised the A interface type that described BSC wishes to save, described notice BSC was that the terminal in the session is set up local exchange, is specially:

Send the local exchange order to described BSC, order described BSC to set up local exchange for two terminals in the session of using described A interface type.

6. method as claimed in claim 5 is characterized in that, receives the local exchange query requests that described BSC sends, and the described local exchange query requests local exchange of asking also comprises can not set up the time:

Send the local exchange refuse information to described BSC, refusal is set up the local exchange that the local exchange query requests is asked.

7. method as claimed in claim 2 or claim 3 is characterized in that, when described local exchange candidate's query requests comprised that described BSC wishes the quantity of the local exchange set up, described informing base station controller BSC was that the terminal in the session is set up local exchange, is specially:

By the retrieval session list corresponding with described BSC, obtain the session aggregation of the session that can set up local exchange, the number of sessions in the described session aggregation and described BSC wish that the quantity of the local exchange set up is complementary;

Send the local exchange order corresponding with each session in the described session aggregation of obtaining to described BSC, ordering described BSC is that two terminals in described each session are set up local exchange.

8. method as claimed in claim 2, it is characterized in that, in this locality exchange candidate query requests that the described BSC that receives sends, also comprise when the quantity of this locality exchange that described BSC wishes to set up and described BSC wish to set up the candidate list of local exchange, described notice BSC is that the terminal in the session is set up local exchange, is specially:

By retrieving described candidate list, obtain the session aggregation of the session that can set up local exchange; The quantity of described session and described BSC wish that the quantity of the local exchange set up is complementary;

9. such as claim 7 or 8 described methods, it is characterized in that, when sent the local exchange order corresponding with last session in the described session aggregation of obtaining to described BSC after, also comprise:

Send the local exchange candidate answer that comprises the local exchange order quantity that has sent to described BSC.

10. the method for claim 1 is characterized in that, described notice BSC is that the terminal in the session is set up local exchange, is specially:

To the local exchange command of described BSC transmission, carry the pairing identification information of described terminal in the described order at a terminal in the described session; Or,

Send the local exchange order of carrying out in batches to described BSC, carry the session list that the described BSC of indication sets up local exchange in the described order.

11. method as claimed in claim 10 is characterized in that, described needs are set up in the session list of local exchange, comprising:

Two pairing identification informations of terminal of each session; Or,

The pairing IMSI information of two terminals of each session.

12., it is characterized in that the pairing identification information of described terminal is specially as claim 10 or 11 described methods:

When described terminal active user's face was set up in the time division multiplexing tdm mode, the pairing identification information of described terminal was specially calling/examples of circuits sign indicating number CIC identification information;

When described terminal active user's face was set up in the IP mode, the pairing identification information of described terminal was specially call identification Call Identifier information and/or described terminal in user's face IP address information of BSC side and/or user's face IP address information of core-network side.

13. method as claimed in claim 10 is characterized in that, describedly sends local exchange command at a terminal in the described session to described BSC, when carrying the pairing identification information of described terminal in the described order, described method also comprises:

Described BSC discerns described terminal according to described identification information;

When described BSC does not have the code conversion function, described BSC returns the pairing session of described terminal at the BSC side ring, discharge the resource that user's face of pairing two terminals of described session does not re-use, and return local exchange at another terminal in the described session or two terminals and finish message;

When described BSC has the code conversion function, if described BSC determines whether the employed speech coding type of two terminals of described session correspondence is consistent, if the speech coding type of described two terminals is consistent or negotiable unanimity, described BSC returns the pairing session of described terminal at the BSC side ring, discharge the resource that user's face of pairing two terminals of described session does not re-use, and return local exchange at another terminal in the described session or two terminals and finish message, if described BSC determines the employed speech coding Type-Inconsistencies of two terminals of described session correspondence, described BSC determines that the pairing session of described terminal can not set up local exchange, and return local swap fault message at a terminal or two terminals in the described session, failure is set up in described local exchange, keep described session the current use of terminal user's face resource be connected.

14. method as claimed in claim 10 is characterized in that, the described local exchange order of carrying out in batches to described BSC transmission is carried in the described order when indicating described BSC to set up the session list of local exchange, and described method also comprises:

Described BSC carries out local exchange to each session in the described session list and sets up operation;

When described BSC carried out local exchange foundation operation to last session in the described session list after, described BSC returned the local exchange request-reply that comprises successful local exchange list and/or the failed list corresponding with described session list.

15. as claim 13 or 14 described methods, it is characterized in that, also comprise:

Described BSC keeps the signaling link of corresponding session, discharges the resource that user's face of the pairing terminal of described session does not re-use.

16. method as claimed in claim 14 is characterized in that, after described BSC returned the local exchange request-reply that comprises the successful local exchange list corresponding with described session list and/or failed list, described method also comprised:

Receive the local exchange request-reply that comprises successful local exchange list and/or the failed list corresponding with described session list that described BSC sends;

According to described successful local exchange list, keep the signaling link of corresponding session, discharge user's face resource and the transmission of described corresponding session institute counterpart terminal.

17. the method for claim 1 is characterized in that, described local exchange identifies by call identification or the local exchange of described two terminals, is specially:

Generate the call identification or the local exchange identification of described two terminals, when when described BSC sends local exchange command, carry the call identification or the local exchange identification of described two terminals by described local exchange command, this locality exchange of setting up according to described local exchange command is identified; Or,

When receiving local exchange that described BSC returns and finish message, receive described local exchange and finish call identification or the local exchange sign of described two terminals that generated by described BSC of carrying in the message, the local exchange of described foundation being finished by call identification or the local exchange sign of described two terminals identifies.

18. the method for claim 1 is characterized in that, receives this locality exchange that described BSC returns and finishes after the message, also comprises:

The signaling link that keeps two terminals of described session discharges user's face resource and the transmission of corresponding two terminals of described session.

19. the method for claim 1 is characterized in that, this locality exchange that the described BSC of described reception returns is finished after the message, and described method also comprises:

Discharge negotiation with two terminals in the described session;

At described terminal, send clear command to described BSC, order described BSC to discharge the Radio Resource of described terminal;

Message is finished in the removing that receives the described terminal of described BSC transmission;

Receive the removing request that described BSC is sent at pairing another terminal of described session that goes out according to described terminal recognition;

At described another terminal, send clear command to described BSC, order described BSC to discharge the Radio Resource of described another terminal;

Message is finished in the removing that receives described another terminal of described BSC transmission, finishes the release to the session of described local exchange.

20. the method for claim 1 is characterized in that, this locality exchange that the described BSC of described reception returns is finished after the message, and described method also comprises:

Pairing first terminal of described session that receives described BSC transmission connects the notification message that interrupts;

Discharge negotiation with corresponding second terminal of described session;

When described release is consulted to finish, for the first terminal in the described session or second terminal, send clear command to described BSC, order described BSC to discharge the Radio Resource of described first terminal or second terminal;

Receive described first terminal of described BSC transmission or the removing of second terminal and finish message;

Receive the removing request that described BSC is sent at pairing second terminal of described session that goes out according to described first terminal or second terminal recognition or first terminal;

At described second terminal or first terminal, send clear command to described BSC, order described BSC to discharge the Radio Resource of described second terminal or first terminal;

Receive described second terminal of described BSC transmission or the removing of first terminal and finish message, finish release the session of described local exchange.

21. the method for claim 1 is characterized in that, this locality exchange that the described BSC of described reception returns is finished after the message, and described method also comprises:

Determine that pairing two terminals of described session need remove local exchange;

According to the current speech type of coding and the A interface transfer resource of pairing two terminals of described session, be pairing two corresponding resources of terminal distribution of described session and end points;

Remove order to described BSC transmission for the local exchange of the corresponding terminal of described session, described local exchange is removed in the order and is included as corresponding two terminal point information that terminal is distributed of described session, makes described BSC remove the local exchange of corresponding two terminals of described session;

When described BSC removes successfully to described local exchange, receiving local exchange that described BSC returns removes and finishes message, and described local exchange is removed and is finished the terminal point information that comprises corresponding two terminals of described session in the message, according to described terminal point information, the A interface user plane of connecting corresponding two terminals of described session connects; When described BSC removes failure to described local exchange, receive the local exchange releasing failed message that described BSC returns, discharging described is corresponding resource and the end points of corresponding two terminal distribution of described session, keeps described local exchange.

22. method as claimed in claim 21 is characterized in that, described BSC removes this locality exchange of pairing two terminals of described session, specifically comprises:

Described BSC receives for the local exchange of the corresponding terminal of described session and removes order, and described local exchange is removed in the order and is included as corresponding two terminal point information that terminal is distributed of described session;

Described BSC is pairing two terminal distribution resources of described session and end points according to described terminal point information;

When described being allocated successfully, described BSC returns for the local exchange releasing of the corresponding terminal of described session and finishes message, or respectively returns the local exchange releasing for corresponding two users of described session and finish message; When described distribution failure, described BSC returns local exchange and removes failed message.

23. method as claimed in claim 22 is characterized in that, described BSC is pairing two terminal distribution resources of described session and end points according to described terminal point information, is specially:

When the terminal point information of distributing for corresponding two terminals of described session that comprises in the received described local exchange releasing of described BSC is ordered is TDM termination information, described BSC is the identical CIC signs of described two terminal distribution, removes to finish in the local exchange of returning and does not carry the CIC sign that described BSC is described two terminal distribution in the message;

When the terminal point information of distributing for corresponding two terminals of described session that comprises in the received described local exchange releasing of described BSC is ordered is the IP terminal point information, described BSC is the IP end points of described two terminal distribution pairing, removes to finish in the local exchange of returning and carries the IP terminal point information that described BSC is described two terminal distribution in the message.

24. the method for claim 1 is characterized in that, this locality exchange that the described BSC of described reception returns is finished after the message, and described method also comprises:

Receive this locality exchange releasing request that described BSC sends;

When request is removed in described local exchange at this locality exchange of appointment, remove this locality exchange of described appointment; Or,

Removing request when described local exchange is specially and comprises this locality exchange that described BSC wishes to remove the quantity of local exchange and remove the candidate when asking, by retrieving local exchange tabulation, obtain the session aggregation of the session that can remove local exchange of the quantity that the quantity of this locality exchange of wishing to remove with described BSC is complementary, order to the corresponding local exchange releasing of described BSC transmission and each session in the described session aggregation of obtaining, order described BSC to remove corresponding local the exchange; Or,

Removing request when described local exchange is specially and comprises described BSC and wish to remove local exchange that the quantity of local exchange and/or described BSC wish to remove the candidate list of local exchange and remove the candidate when asking, by retrieving described candidate list, obtain the session aggregation of wishing the session that to remove local exchange of the quantity that the quantity of the local exchange removed is complementary with described BSC, send the local exchange corresponding with each session in the described session aggregation of obtaining to described BSC and remove order, order described BSC to remove corresponding local exchange.

25. method as claimed in claim 24 is characterized in that, when sent the local exchange releasing order corresponding with last session in the described session aggregation of obtaining to described BSC after, also comprises:

Send the local exchange that comprises the local exchange releasing order quantity that has sent to described BSC and remove candidate answer.

26. the method for claim 1 is characterized in that, this locality exchange that the described BSC of described reception returns is finished after the message, and described method also comprises:

Described BSC has determined to set up a terminal in the described session of local exchange will carry out that BSC is inner to be switched, and described terminal can not be supported described local exchange after switching;

Before the inner switching of described BSC was carried out, described BSC sent the request of removing the corresponding local exchange of described terminal, removes described local exchange.

27. the method for claim 1 is characterized in that, this locality exchange that the described BSC of described reception returns is finished after the message, and described method also comprises:

The terminal that described BSC has determined to set up in the described session of local exchange will carry out switching between BSC, and described terminal can not be supported described local exchange after switching;

28. the method for claim 1 is characterized in that, this locality exchange that the described BSC of described reception returns is finished after the message, and described method also comprises:

Determine that one or both network element in the described local exchange breaks down, and removes the calling of corresponding local exchange;

Comprise the call identification of corresponding described two terminals of described local exchange or the call cleared message of local exchange sign to described BSC transmission;

Receive the call identification that comprises the described calling that is eliminated of described BSC transmission or the call clearing response of local exchange sign.

29. the method for claim 1 is characterized in that, this locality exchange that the described BSC of described reception returns is finished after the message, and described method also comprises:

Described BSC determines that one or both network element in the described local exchange breaks down;

Receive the call identification that comprises corresponding described two terminals of described local exchange of described BSC transmission or the call cleared message of local exchange sign;

Remove the calling of corresponding local exchange;

Comprise the call identification of the described calling that is eliminated or the call clearing response of local exchange sign to described BSC transmission.

30. such as the described method of any one in the claim 21 to 29, it is characterized in that, remove after the described local exchange, also comprise:

Discharge call identification or the local exchange sign of corresponding described two terminals of described local exchange.

31. the implementation method of the local exchange of base station sub-system BSS is characterized in that, comprising:

Receive the local exchange order that moving exchanging center MSC sends;

32. method as claimed in claim 31 is characterized in that, also comprises:

Send local exchange candidate query requests to described MSC, or local exchange query requests, trigger described MSC and send described local exchange command.

33. method as claimed in claim 31 is characterized in that, is that two terminals in the session are set up after the local exchange according to described local exchange order, also comprises:

The signaling link that keeps corresponding session discharges the resource that user's face of the pairing terminal of described session does not re-use.

34. method as claimed in claim 31 is characterized in that, after message is finished in the local exchange of described MSC transmission, also comprises:

When the disconnecting determined with the corresponding terminal of described session, perhaps, a terminal in the described session of determining to set up local exchange will carry out that BSC is inner to be switched, and when described terminal can not be supported described local exchange after switching, perhaps, a terminal in the described session of determining to set up local exchange will carry out switching between BSC, and when described terminal can not be supported described local exchange after switching, notifies described MSC to remove described local exchange.

35. method as claimed in claim 34 is characterized in that, removes after the described local exchange, also comprises:

36. a MSC is characterized in that, comprising:

Sending module, the terminal that is used for notice BSC and is session is set up local exchange;

37. MSC as claimed in claim 36 is characterized in that, also comprises:

Processing module is used for receiving after local exchange finishes message at described receiver module, keeps the signaling link of two terminals of described session, discharges other resources of pairing two terminals of described session.

38. MSC as claimed in claim 36 is characterized in that, also comprises:

Determination module is used for determining whether two terminals of described session are positioned at same BSS.

39. a BSC is characterized in that, comprising:

Receiver module is used for receiving the local exchange order that MSC sends;

Sending module, be used for described set up module and set up local exchange after, send local exchange to described MSC and finish message.

40. BSC as claimed in claim 39 is characterized in that, also comprises:

Described sending module also is used for sending local exchange candidate query requests to described MSC, or the local exchange query requests, triggers described MSC and sends described local exchange order.

41. BSC as claimed in claim 39 is characterized in that, also comprises:

Processing module, be used for described set up module and set up local exchange after, keep the signaling link of corresponding session, discharge the resource that user's face of the pairing terminal of described session does not re-use.

42. the realization system of the local exchange of BSS is characterized in that, comprises MSC and BSC:

Described MSC, the terminal that is used for notice BSC and is session is set up local exchange, and receives the local exchange that described BSC returns and finish message;

Described BSC is used for receiving the notice of setting up local exchange that described MSC sends, and for two terminals in the session are set up local exchange, and sends local exchange to described MSC and finishes message.

43. the realization system of BSS local exchange as claimed in claim 42 is characterized in that, also comprises:

Described MSC also is used for sending local exchange to described BSC and removes order, and ordering described BSC is that two terminals in the session are removed local exchanges, and receives the local exchange that described BSC returns and remove response;

Described BSC also is used for receiving the local exchange that described MSC sends and removes order, is that two terminals in the session are removed local exchanges according to the local exchange order that receives, and sends local exchange to described MSC and remove response.