CN101801053B

CN101801053B - Method for removing local exchange, core network equipment and base station subsystem

Info

Publication number: CN101801053B
Application number: CN 200910007601
Authority: CN
Inventors: 朱星; 秦钧; 王之曦; 王超
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2009-02-11
Filing date: 2009-02-11
Publication date: 2013-03-13
Anticipated expiration: 2029-02-11
Also published as: WO2010091641A1; CN101801053A

Abstract

The invention discloses a method for removing local exchange, core network equipment and a base station subsystem. The method comprises the following steps of: confirming whether a first calling in the two switched callings is positioned in a second base station subsystem or not when a first message for requiring switching, which is from a first base station subsystem, is received, and distributing core network resources for the two callings; transmitting a second message for requiring switching to the second base station subsystem, wherein the core network resource which is distributed for the first calling in the two callings is carried in the second message; and transmitting a fourth message for indicating and executing switching operation to the first base station subsystem when a third message for expressing switching request confirmation, which is returned by the second base station subsystem, is received, wherein the indicating information for removing the local exchange of the two callings and the distributed core network resource information are carried in the fourth message. The method can save the executing time of the process and the message quantity of an interface A without adding an additional process for removing the local exchange.

Description

Remove method, equipment of the core network and the base station sub-system of local exchange

Technical field

The present invention relates to wireless communication technology field, be specifically related to remove method, equipment of the core network and the base station sub-system of local exchange.

Background technology

Transmission network is the important component part of cordless communication network, and the operator of at present a lot of countries and regions has affected deployment, operation and professional the carrying out of wireless network because connect the bottleneck problem of the transfer resource of wireless access network and core net.In areas such as Africa, the development speed of wireless network is far above the development of cable network.Taking in Europe as the area of representative, owing to be subject to the restriction of local law rules, the construction of ground wire transmission network can't be built according to the demand of operator.Even the terrestrial transmission resource is than the country of horn of plenty, such as China, also facing to remote districts, island being carried out with high costs when building of transmission network, the problem that rate of return on investment is low.In above-mentioned scene, operator is generally the method that adopts microwave, satellite or rent the terrestrial transmission circuit.Therefore, reduction takies transmission network bandwidth, can effectively reduce networking and operation cost, and local exchange is exactly a kind of method of effective reduction transfer resource bandwidth.

Mobile communication system mainly is comprised of travelling carriage (MS, Mobile Station), base station sub-system (BSS, Base Station Subsystem) and network subsystem (Network Station Subsystem).Base transceiver station (BTS, Base Transceiver Station) and base station controller (BSC, Base StationController) have consisted of BSS.Mobile switching centre (MSC, Mobile Switching Center) is positioned at NSS, and it controls the business of all BSC, provide function of exchange and with system in the connection of other function.Fig. 1 is global system for mobile communications schematic diagram in the prior art, and MSC101 communicates by letter with BSC102 by the A interface, and BSC102 communicates by letter with BTS103 by Abis interface, and BTS103 communicates by letter with MS104 by Um Interface.

With reference to Fig. 1, for caller and the called session that is positioned at same BSS, local exchange can be implemented in the loopback of finishing talking link in the BSS, and namely the speech data of user's face does not flow out this BSS, thereby realizes the saving of special interface transfer resource.Comprise local exchange and the interior local exchange of BTS in the BSC.Local exchange in the BTS refers to that two callings are at same BTS, or in same BTS bunch (for the situation of BTS cascade), the loopback of voice link occurs among the corresponding BTS, as shown in Figure 1, the voice link loopback of the MS104-2 of MS104-1 occurs among the BTS103-1, and the voice link loopback of MS104-3 and MS-104-4 occurs in BTS103-2 bunch.By setting up the local exchange in the BTS, can realize the saving to Abis interface and A interface transfer resource.For the local exchange in the BSC, the session both sides are positioned at same BSC, but in different BTS (BTS bunch), the voice link loopback occurs among the corresponding BSC, as shown in Figure 1, the voice link loopback of MS104-5 and MS104-6 occurs among the BSC102-1.By setting up the local exchange in the BSC, can realize the saving to A interface transfer resource.

A kind of method of removing local exchange is in the prior art: when the BSS at two calling places finds that a calling must switch to another residential quarter, this BSS needs to propose to MSC first the local exchange of described two callings of releasing, after local exchange was removed successfully, BSS initiated switching flow again.

In the research and practice process to prior art, the present inventor finds that said method is removed first local exchange, switches again, so that the flow performing time is longer, and the local exchange flow process can increase the message number of A interface.And local exchange has certain influence to speech quality, and back to back switching also has certain influence to speech quality, and twice adverse effect stack may have a strong impact on speech quality.

Summary of the invention

The embodiment of the invention provides method, equipment of the core network and the base station sub-system of removing local exchange, can remove local exchange when switching.

The embodiment of the invention provides the method for following releasing local exchange:

Remove the method one of local exchange, comprising:

During the first message that reception is switched from the requirement of the first base station sub-system, determine that first during switching latter two calls out called out and to be positioned at the second base station sub-system, be described two call distribution resources of core network;

Send the second message that request is switched to described the second base station sub-system, carry the resources of core network of the first call distribution in promising described two callings in described the second message;

When receiving the 3rd message of the expression Handover Request Acknowledge that returns from the second base station sub-system, send the 4th message that handover operation is carried out in indication to described the first base station sub-system, carry the indication information of the local exchange of removing described two callings and the resources of core network information of distributing in described the 4th message.

Remove the method two of local exchange, comprising:

Reception carries the indication information of the local exchange of removing two callings from the 7th message of the indication execution handover operation of core-network side in described the 7th message, and is described two resources of core network information that calling distributes;

According to described the 7th message, remove the local exchange of described two callings, and described two callings are imported core net, and the calling of first in two callings is switched to the second base station sub-system from the first base station sub-system.

Remove the method three of local exchange, comprising:

Receive the tenth message of carrying out handover operation from the indication of core-network side, the indication information that carries the local exchange of removing two callings in described the tenth message reaches the resources of core network information of distributing for the calling of second in described two callings;

According to entrained information in described the tenth message, the calling of first in described two callings is switched to the second base station sub-system;

Receiving when removing 11 message of resource from the indication of core-network side, removing the local exchange of described two callings, and will described second calling out the importing core net.

Remove the method four of local exchange, comprising:

Receive the 13 message of the requirement switching of the 3rd base station sub-system transmission, carry the information that local exchange is removed in application in described the 13 message;

When determining to allow to remove the local exchange of two callings corresponding to described the 13 message, send the 14 message that handover operation is carried out in indication to described the 3rd base station sub-system, indicate the 3rd base station sub-system to remove the local exchange of described two callings.

The embodiment of the invention also provides following equipment of the core network:

Equipment of the core network one comprises:

The first receiving element is used for receiving the message from the first base station sub-system, and described message comprises the first message that requirement is switched;

The first judging unit is used for corresponding two the rear described zones of calling switching of the first message of judging that described the first receiving element receives;

The first resource administrative unit is used for higher management net resource, comprising: first after described the first judgment unit judges goes out to switch in described two callings are called out in the time of will being positioned at the second base station sub-system, are described two call distribution resources of core network;

The first transmitting element is used for sending message to described the second base station sub-system, comprising: the second message that request is switched, and carrying the first resource administrative unit in described the second message is the resources of core network of the first call distribution in described two callings;

The second receiving element is used for receiving the message from the second base station sub-system, and described message comprises the 3rd message that represents Handover Request Acknowledge;

The second transmitting element, be used for sending message to the first base station sub-system, when described message is included in described the second receiving element and receives described the 3rd message, the 4th message of handover operation is carried out in the indication that sends to described the first base station sub-system, carries the indication information of the local exchange of removing described two callings and the resources of core network information of distributing in described the 4th message.

Equipment of the core network two comprises:

The 5th receiving element is used for receiving the message that sends from the 3rd base station sub-system, and described message comprises the 7th message that requirement is switched, and carries the information that local exchange is removed in application in described the 7th message;

The second judging unit is for the local exchange that judges whether to allow to remove two callings corresponding to described handover request message;

The 5th transmitting element, be used for sending message to described the 3rd base station sub-system, described message comprises: when described the second judgment unit judges allows to remove the local exchange of described two callings, the 8th message of handover operation is carried out in the indication that sends, and is used to indicate the local exchange that the 3rd base station sub-system is removed described two callings.

The embodiment of the invention also provides following base station sub-system:

Base station sub-system one comprises:

The 3rd receiving element, be used for receiving the message from core-network side, described message comprises indicates the tenth message of carrying out handover operation, carries the indication information of the local exchange of removing two callings in described the tenth message, and is described two resources of core network information that calling distributes;

The first local exchange is removed the unit, is used for the indication information of the local exchange of two callings of releasing of carrying according to the tenth message that described the 3rd receiving element receives, and removes the local exchange of described two callings;

First imports the unit, is used for calling out the resources of core network of distributing according to what the tenth message that described the 3rd receiving element receives was carried for described two, will described two calls out the importing core net;

The first switch unit for the tenth message that receives according to described the 3rd receiving element, switches to the second base station sub-system with the calling of first in described two callings from the first base station sub-system.

Base station sub-system two comprises:

The 4th receiving element, be used for receiving the message from core-network side, comprise and indicate the 13 message of carrying out handover operation and indicate the 14 message of removing resource that the indication information that carries the local exchange of removing two callings in described the 13 message reaches the resources of core network information of distributing for the calling of second in described two callings;

The second switch unit, the information for the 13 message that receives according to the 4th receiving element is carried switches to the second base station sub-system with the calling of first in described two callings from the first base station sub-system;

The second local exchange is removed the unit, is used for removing the local exchange of described two callings when described the 4th receiving element receives 14 message;

Second imports the unit, is used for when described the 4th receiving element receives 14 message, calls out described second and imports core net.

Base station sub-system three comprises:

The 6th receiving element, be used for receiving the message from core-network side, described message comprises indicates the 17 message of carrying out handover operation, carries the indication information of the local exchange of removing two callings in described the 17 message, and is described two resources of core network information that calling distributes;

The 3rd local exchange is removed the unit, is used for the indication information of the local exchange of two callings of releasing of carrying according to the 17 message that described the 6th receiving element receives, and removes the local exchange of described two callings;

The 3rd imports the unit, is used for calling out the resources of core network of distributing according to what the 17 message that described the 6th receiving element receives was carried for described two, will described two calls out the importing core net;

The 3rd switch unit is used for receiving the 17 message according to described Unit the 6th, first in described two callings is called out switch to the second residential quarter from the first residential quarter.

In a kind of technical scheme of the embodiment of the invention, receiving the message of switching from the requirement of the first base station sub-system, first in two callings after determining to switch are called out in the time of will being positioned at the second base station sub-system, are described two call distribution resources of core network; And send the message that request is switched to the second base station sub-system, carry the resources of core network of the first call distribution in promising described two callings in the message that described request is switched, and when receiving the message of the expression Handover Request Acknowledge that returns from the second base station sub-system, send the message that handover operation is carried out in indication to described the first base station sub-system, carry the indication information of the local exchange of removing described two callings and the resources of core network information of distributing in the message of described indication execution handover operation, thereby can make described the first base station sub-system remove the local exchange of described two callings, and described the first calling is switched to the second base station sub-system.As seen, the method for described releasing local exchange does not need to increase the flow process of extra releasing local exchange, removes local exchange when switching, and therefore can save the time of implementation of flow process, and the message number of saving the A interface.And, owing to do not need independent flow process to remove local exchange, therefore can not produce adverse influence to speech quality owing to removing local exchange, experience thereby can improve the user.

In the another kind of technical scheme of the embodiment of the invention, when the message that the requirement that receives the transmission of the 3rd base station sub-system is switched, when in the message that described requirement is switched, carrying the information of application releasing local exchange, judge whether to allow to remove the local exchange of two callings corresponding to message that described requirement switches, and when allowing, send the message that handover operation is carried out in indication to described the 3rd base station sub-system, indicate the 3rd base station sub-system to remove the local exchange of described two callings.Can find out that equally the method for described releasing local exchange does not need to increase the flow process of extra releasing local exchange, when switching, remove local exchange, therefore can save the time of implementation of flow process, and the message number of saving the A interface.And, owing to do not need independent flow process to remove local exchange, therefore can not produce adverse influence to speech quality owing to removing local exchange, experience thereby can improve the user.

Description of drawings

Fig. 1 is global system for mobile communications schematic diagram in the prior art;

Fig. 2 is method one flow chart of removing local exchange in the embodiment of the invention;

Fig. 3 is the embodiment one signaling process figure that removes the method one of local exchange in the embodiment of the invention;

Fig. 4 A-C removes among the embodiment one of method one of local exchange in the handoff procedure resource to distribute schematic diagram in the embodiment of the invention;

Fig. 5 is the embodiment two signaling process figure that remove the method one of local exchange in the embodiment of the invention;

Fig. 6 A-C removes among the embodiment two of method one of local exchange in the handoff procedure resource to distribute schematic diagram in the embodiment of the invention;

Fig. 7 is the method two flow chart of removing local exchange in the embodiment of the invention;

Fig. 8 is the embodiment signaling process figure that removes the method two of local exchange in the embodiment of the invention;

Fig. 9 is MSC embodiment one structural representation in the embodiment of the invention;

Figure 10 is MSC embodiment two structural representations in the embodiment of the invention;

Figure 11 is MSC embodiment three structural representations in the embodiment of the invention;

Figure 12 is BSS embodiment one structural representation in the embodiment of the invention;

Figure 13 is BSS embodiment two structural representations in the embodiment of the invention;

Figure 14 is BSS embodiment three structural representations in the embodiment of the invention;

Figure 15 is BSS embodiment four structural representations in the embodiment of the invention;

Figure 16 is BSS embodiment five structural representations in the embodiment of the invention;

Figure 17 is BSS embodiment six structural representations in the embodiment of the invention.

Embodiment

The embodiment of the invention provides method, equipment of the core network and the base station sub-system of removing local exchange, removes local exchange when can be implemented in switching, below is elaborated respectively.

Switch and to refer to when the travelling carriage in the conversation enters another residential quarter from a residential quarter, network can switch to a certain channel of new residential quarter to travelling carriage from the used channel in former residential quarter, and assurance user's conversation is not interrupted.Switch the switching between the interior different districts of switching and same BSS controlled area (Intra-BSS) that comprises between the interior residential quarter, different B SS controlled area (Inter-BSS), the embodiment of the invention can be separately implemented in above-mentioned two kinds of handoff procedures and remove local exchange.Corresponding be called to switch between Inter-BSS to remove to switch between local exchange and Intra-BSS remove local exchange, below be elaborated respectively.

Switch between method one, Inter-BSS and remove local exchange:

With reference to Fig. 2, for removing method one flow chart of local exchange in the embodiment of the invention, concrete steps are as follows:

The first message that S201, reception are switched from the requirement of the first base station sub-system;

The first calling that S202, judgement are switched in latter two calling will be positioned at the second base station sub-system, be described two call distribution resources of core network;

S203, send the second message that request is switched to described the second base station sub-system, carry the resources of core network of the first call distribution in promising described two callings in described the second message;

S204, receive the 3rd message of the expression Handover Request Acknowledge that returns from the second base station sub-system;

S205, send the 4th message that handover operation is carried out in indication to described the first base station sub-system, carry the indication information of the local exchange of removing described two callings and the resources of core network information of distributing in described the 4th message, so that described the first base station sub-system is removed the local exchange of described two callings, and call out described first and to switch to the second base station sub-system.

As seen, flow process and the switching flow of removing local exchange in the embodiment of the invention carry out simultaneously, owing to do not need to increase the flow process of independent releasing local exchange, therefore can reduce the time of implementation of whole flow process.And, owing to adopt the message in the switching flow to transmit the needed information of local exchange of removing, therefore can reduce the message number of A interface.And flow process and the switching flow of removing local exchange carry out simultaneously, and therefore the stack of the unfavorable factor that produces in the time of also can avoiding two flow processs to carry out separately can improve the user and experience the impact of speech quality.

For convenience of description, adopt the describing modes such as the first message, the second message in the present specification, be understandable that, described the first message, the second message just are used for distinguishing different message, and are not used in function or the order of expression message.

For those skilled in the art being understood better and realizing the embodiment of the invention, referring to accompanying drawing, be elaborated by concrete application scenarios.

Embodiment one, for convenience of description is located at and relates to terminal MS 1 and MS2 in the handoff procedure, and before the switching, MS1 and MS2 are positioned at BSS1; After the switching, MS1 is positioned at BSS2, and MS2 still is positioned at BSS1.

With reference to Fig. 3, for removing the embodiment one signaling process figure of the method one of local exchange in the embodiment of the invention, concrete steps are as follows:

S301, BSS1 send expression to MSC and require the switching of switching to require (Handover Required) message;

BSS1 can connect by the signaling connection control unit (SCCP, Signal Connection ControlPart) of MS1 the message to MSC transmission Handover Required.According to different application scenarioss, can carry BSS1 in the described Handover Required message is the related resource that MS1 and calling corresponding to MS2 distribute, to realize and the docking of MSC Resources allocation.For example, when A interface user plane IP carried, BSS1 was the IP end points of described two call distribution BSS1 sides, and informed MSC by Handover Required message.

For each calling under the same MSC, can adopt certain identification means, it is carried out unique identification.For example, can adopt the cell of call identification (Call-ID) to identify.Except Call-ID, can also adopt other modes, present specification institute act mode is not construed as limiting it.

S302, MSC judge after the switching, two corresponding callings will be positioned at different BSS to MS1 with MS2, MSC is described two call distributions 3 resources of core network: CR1, CR2 and CR1 ', and wherein: CR1 and CR2 are used for BSS1 the calling of MS1 and the calling of MS2 are imported core net; CR1 ' is used for BSS2 with the calling importing core net of MS1; And to handover request (HandoverRequest) message that BSS2 sends expression request switching, carry CR1 ' the resources of core network information that MSC distributes in the Handover Request message;

Which calling MSC can judge needs to remove local exchange.For example, MSC can consist of by record two cell IDs (Cell-ID) of calling out the residential quarter, place of session, in conjunction with two requirements of calling out employed encoding and decoding and current supplementary service, judge whether to remove the local exchange of two callings of described session.For example, MSC can judge that the formation session is two and calls out whether needs are removed local exchange according to following several aspects:

1) when described two callings need to be positioned at different BSS, needs to remove local exchange.

2) encoding and decoding when described two callings change, and when becoming not identical or incompatible, need to remove local exchange.

3) for supplementary service, when the attribute of call business changes, when conflicting mutually with local exchange, need to remove local exchange.For example, conflict with local exchange for Call Waiting, the attribute of calling out the supplementary services such as maintenances, MPTY, can't carry out local exchange, necessary releasing.

BSC also can judge the situation that two callings are positioned at different B SC, and at this moment, which two call release local exchange BSC can be shown at the handover request message middle finger that sends.

S303, BSS2 return Handover Request Acknowledge (HandoverRequest Ack) message of expression Handover Request Acknowledge to MSC;

S304, MSC send switching command (HandoverCommand) message that handover operation is carried out in indication to BSS1, carry MSC in the described Handover Command message and be MS1 call distribution resources of core network CR1 and be the resources of core network CR2 resource information of the call distribution of MS2, and remove the indication information of the local exchange of described two callings;

MSC can utilize the SCCP of MS1 to connect to BSS1 and send Handover Command message.

When the Handover Command message that receives from MSC, BSS1 will stop local exchange, described two be called out import core net, and then BSS1 switches to BSS2 with MS1.In handoff procedure, MSC can be simultaneously by CR1 and CR1 ' from MS1 receiving and transmitting voice data.

S305, BSS2 send change detection (Handover Detect) message to MSC;

BSS2 detects the legitimacy of MS1, if legal, MS1 handover success then, BSS2 utilizes CR1 ' that the calling of MS1 is imported core net, and carries out S306.

S306, BBS2 send the switching of indicating switching to finish to MSC and finish (Handover Complete) message;

When S307, MSC send indication and remove clear command (Clear Command) the message erasing MS1 of resource and switch to BSS1 in BSS1 shared resource;

MSC is after receiving Handover Complete message, remove MS1 shared resource when switching, comprising CR1 etc., MSC sends Clear Command message to BSS1 simultaneously, when BSS1 receives Clear Command message, remove the related resource of MS1 in BSS1, comprise interface-free resources.

S308, BSS1 finish (Clear Complete) message to the removing that MSC transmission expression removing resource is finished.

After the resource that MS1 takies in BSS1 when switching discharged and finishes, BSS1 sent ClearComplete message to MSC.

It more than is the method flow of removing local exchange when switching between Inter-BSS, referring to description of drawings before switching, in the handoff procedure and the resource allocation conditions after switching: with reference to Fig. 4 A, for the resource of described two callings before switching in the present embodiment is distributed schematic diagram, MS1 and MS2 carry out local exchange by BSS1, take the resource among the BSS1.With reference to Fig. 4 B, for the resource of two callings described in the handoff procedure in the present embodiment is distributed schematic diagram, MSC can pass through resources of core network CR1 and CR1 ' simultaneously from MS1 receiving and transmitting voice data, simultaneously, and the resources of core network CR1 ' that MSC reserves for the MS1 that will switch to BSS2.With reference to Fig. 4 C, for the resource of described two callings after switching in the present embodiment is distributed schematic diagram, the resources of core network CR1 that MS1 uses in handoff procedure removes, MSC obtains speech data by the resource in resources of core network CR2, the BSS1 and interface-free resources from MS2, obtains speech data by resource and interface-free resources in resources of core network CR1 ', the BSS2 from MS1.

Be understandable that, in implementation, can also do further to optimize to above-described embodiment.For example,

When BSS1 can't remove local exchange or can't call out the importing core net with described two, BSS1 will can not send Handover Command message to MS1, and to handoff failure (Handover Failure) message that MSC sends the indication handoff failure, can indicate the local exchange failure in the Handover Failure message.For example, the cause value in can Handover Failure message is set to: can't remove local exchange (Fail to release local switch).MSC stops switching flow when receiving Handover Failure message, and removing is called out the resources of core network of distributing for described two.Like this, described two callings will continue to carry out local exchange, treat as switching and never occur.

And if MS1 can't switch to BSS2, when returning back to BSS1, BSS1 will described two callings import core net, and to MSC transmission Handover Failure message indication failure cause, the cause value that for example can arrange in the Handover Failure message is: the wave point failure, revise back former channel (Radiointerface failure, revision to old channel).MSC removes the resources of core network into described two call distributions, and carries out existing handoff failure handling process after receiving the switch failure information that BSS1 sends, and is not described in detail.

Embodiment two, for convenience of description, are located at and relate to terminal MS 1 and MS2 in the handoff procedure, and before the switching, MS1 and MS2 are positioned at BSS1; After the switching, MS1 is positioned at BSS2, and MS2 still is positioned at BSS1.Similar with embodiment one, when MSC received Handover Required message, when finding that calling corresponding to the rear MS1 of switching and MS2 will be positioned at different BSS, local exchange must be removed.Difference is, in handoff procedure, keeps the local exchange of described two callings, after switching is finished, removes the local exchange of described two callings again.

With reference to Fig. 5, for removing the embodiment two signaling process figure of the method one of local exchange in the embodiment of the invention, concrete steps are as follows:

S501, BSS1 send to switch to MSC and require (Handover Required) message;

BSS1 can connect by the signaling connection control protocol (SCCP, Signal Connection ControlProtocol) of MS1 the message to MSC transmission Handover Required.According to different application scenarioss, can carry BSS1 in the described Handover Required message is the related resource that MS1 and calling corresponding to MS2 distribute, to realize and the docking of MSC Resources allocation.For example, when A interface user plane IP carried, BSS1 was the IP end points (comprising IP address and port numbers) of described two call distribution BSS1 sides, and informed MSC by Handover Required message.

S502, MSC judge after the switching, two corresponding callings will be positioned at different BSS to MS1 with MS2, MSC is 2 resources of core network: CR1 of described two call distributions and CR2, and wherein: CR2 is used for BSS1 with the calling importing core net of MS2, and CR1 is used for BSS2 with the calling importing core net of MS1; And to BSS2 transmission handover request (Handover Request) message, carry the CR1 resources of core network information that MSC distributes in the Handover Request message;

Which calling MSC can judge needs to remove local exchange.The determination methods of introducing in specifically can the embodiment one of reference method one repeats no more.

S503, BSS2 return Handover Request Acknowledge (Handover Request Ack) message to MSC;

S504, MSC send switching command (Handover Command) message to BSS1, carry the resources of core network CR2 resource information that MSC is the call distribution of MS2 in the described Handover Command message, and remove the indication information of the local exchange of described two callings;

When the Handover Command message that receives from MSC, BSS1 will keep local exchange, and meanwhile, BSS1 cuts out MS1.

S505, BSS2 send change detection (Handover Detect) message to MSC;

BSS2 detects the legitimacy of MS1, if legal, MS1 handover success then, BSS2 import core net with resources of core network CR1 with the calling of MS1 immediately, and carry out S506.

S506, BBS2 send to switch to MSC and finish (Handover Complete) message;

When S507, MSC send clear command (Clear Command) message erasing MS1 and switch to BSS1 in BSS1 shared resource;

MSC is after receiving Handover Complete message, and the resource of utilizing Clear Command message erasing MS1 to take in BSS1 comprises interface-free resources etc.BSS1 removes the local exchange of described two callings after receiving Clear Command message, with the calling importing core net of MS2.

S508, BSS1 send to remove to MSC and finish (Clear Complete) message.

It more than is the method flow of removing local exchange when switching between Inter-BSS, referring to description of drawings before switching, in the handoff procedure and the resource allocation conditions after switching: with reference to Fig. 6 A, for the resource of described two callings before switching in the present embodiment is distributed schematic diagram, MS1 and MS2 carry out local exchange by BSS1, take the resource among the BSS1.With reference to Fig. 6 B, distribute schematic diagram for the resource of two callings described in the handoff procedure in the present embodiment, MS1 and MS2 still carry out session by local exchange, simultaneously, the resources of core network CR1 that MSC reserves for the MS1 that will switch to BSS2 is for MS2 reserves resources of core network CR2.With reference to Fig. 4 C, for the resource of described two callings after switching in the present embodiment is distributed schematic diagram, resource in the local exchange process in the employed BSS1 is removed, MSC obtains speech data by the resource in resources of core network CR2, the BSS1 and interface-free resources from MS2, obtains speech data by the resource in resources of core network CR1, the BSS2 and interface-free resources from MS1.

When BSS1 can't remove local exchange or can't call out the importing core net with described two, BSS1 will can not send Handover Command message to MS1, and send handoff failure (HandoverFailure) message to MSC, Handover Failure message can indicate the former of handoff failure because: can't remove local exchange.MSC stops switching flow when receiving Handover Failure message, and removing is called out the resources of core network of distributing for described two.Like this, described two callings will continue to carry out local exchange, treat as switching and never occur.

And if MS1 can't switch to BSS2, when returning back to BSS1, BSS1 will described two callings import core net, and to MSC transmission Handover Failure message indication handoff failure reason, the cause value that for example can arrange in the Handover Failure message is: the wave point failure, revise back former channel (Radiointerface failure, revision to old channel).MSC removes the resources of core network into described two call distributions, and carries out existing handoff failure handling process after receiving the switch failure information that BSS1 sends, and is not described in detail.

Switch between method two, Intra-BSS and remove local exchange:

With reference to Fig. 7, for removing the method two flow chart of local exchange in the embodiment of the invention, concrete steps are as follows:

The 13 message that the requirement that S701, reception the 3rd base station sub-system send is switched carries the information that local exchange is removed in application in described the 13 message;

S702, when determine to allow removing the local exchange of two callings corresponding to described the 13 message, send the 14 message that handover operation is carried out in indication to described the 3rd base station sub-system, indicate the 3rd base station sub-system to remove the local exchange of described two callings.

As seen find out that flow process and the switching flow of removing local exchange in the embodiment of the invention carry out simultaneously, owing to do not need to increase the flow process of independent releasing local exchange, therefore can reduce the time of implementation of whole flow process.And, owing to adopt the message in the switching flow to transmit the needed information of local exchange of removing, therefore can reduce the message number of A interface.And flow process and the switching flow of removing local exchange carry out simultaneously, and therefore the stack of the unfavorable factor that produces in the time of also can avoiding two flow processs to carry out separately can improve the user and experience the impact of speech quality.

For those skilled in the art being understood better and realizing the present invention, referring to accompanying drawing, be elaborated by specific embodiment:

With reference to Fig. 8, for removing the embodiment signaling process figure of the method two of local exchange in the embodiment of the invention, in handoff procedure, remove the local exchange of two callings (being made as the calling of MS1 and the calling of MS2) in the BSS3, concrete steps are as follows:

S801, BSS3 send the inside that requires to switch to MSC and switch requirement (Internal HandoverRequired) message, carry the information that local exchange is removed in application in the described message;

Under some scene, for example A interface user plane bearing mode is under the scene of IP, also should comprise the related resource that BSS3 is described two call distributions in the InternalHandover Required message, described related resource comprises two IP end points (comprising IP address and IP port numbers) of BSS3 side.

S802, MSC judge when allowing to switch the local exchange of described two callings of rear releasing, send indication to BSS3 and carry out inner inside switching command (the Internal Handover Command) message of switching, (for example carry the indication information of releasing local exchange in the described message, carry cell and remove local exchange sign (Release Local Switch Indication)), be used to indicate the local exchange that BSS3 removes described two callings;

In Internal Handover Command message, except the cell that can comprise the local exchange of removing described two callings, also can be included as the resources of core network information of described two call distributions.

S803, BSS3 remove the local exchange of described two callings, and with described two calling importing core net, BSS3 carries out handover operation simultaneously, and finishes (HandoverComplete) message to the switching that the MSC transmission indicates switching to finish.

Can carry local exchange result (the Release LocalSwitch Result) information of removing in the Handover Complete message.

As seen, in the present embodiment, by in handoff procedure, transmitting the message of removing local exchange, avoided handoff procedure and releasing local exchange process to carry out respectively, therefore can save total flow performing time, and the message number of minimizing A interface, therefore the adverse effect that in the time of can avoiding handoff procedure to carry out separately with releasing local exchange process simultaneously speech quality is caused can improve speech quality.

In concrete the execution, also can do further to optimize to above-described embodiment, for example, behind the execution in step S802, if BSS3 can't remove local exchange or will described two call out when importing the core net failure switching flow termination.At this moment, BSS3 can send handoff failure (Handover Failure) message to MSC, carries the failure of cell indication local exchange in the described message.For example: the cause value in can Handover Failure message is set to: remove local exchange failure (Release local switch failed) and inform the MSC handoff failure.When MSC receives the Handover Failure message of the described Release of carrying local switch failed cause value, can remove the resources of core network into described two call distributions.

And behind execution in step S801, if MSC does not allow to remove the local exchange of described two callings, then can send to BSS3 and represent that the inside switching that the described switching of refusal requires requires to refuse (InternalHandover Required Reject) message, carries the cell indication and does not allow to remove local exchange in the message.For example, the cause value in can Internal Handover Required Reject message is set to: do not allow to remove local exchange (Nor allowed to Release local switch).

Be understandable that, the present specification illustrated embodiment is not limited to the present invention, for example, do not limit above-mentioned message formation to removing the message that adopts in the local exchange flow process, message formation (comprising cell structure) can define flexibly on the basis of realization information transmission.

More than the method for removing local exchange in the embodiment of the invention is described in detail, for those skilled in the art being understood better and realizing the present invention, referring to accompanying drawing, the MSC in the embodiment of the invention and BSS are carried out the correspondence description.

With reference to Fig. 9, be MSC embodiment one structural representation in the embodiment of the invention, MSC900 comprises:

The first receiving element 901 is used for receiving the message from the first base station sub-system, and described message comprises the first message that requirement is switched;

The first judging unit 902 is used for corresponding two the rear described zones of calling switching of the first message of judging that described the first receiving element 901 receives;

First resource administrative unit 903 is used for higher management net resource, comprising: first after described the first judging unit 902 is judged switching in described two callings are called out in the time of will being positioned at the second base station sub-system, are described two call distribution resources of core network;

The first transmitting element 904 is used for sending message to described the second base station sub-system, comprising: the second message that request is switched carries first resource administrative unit 903 and is the resources of core network of the first call distribution in described two callings in described the second message;

The second receiving element 905 is used for receiving the message from the second base station sub-system, and described message comprises the 3rd message that represents Handover Request Acknowledge;

The second transmitting element 906, be used for sending message to the first base station sub-system, when described message is included in described the second receiving element 905 and receives described the 3rd message, carry out the 4th message of handover operation to the indication of described the first base station sub-system transmission, carry the indication information of the local exchange of removing described two callings and the resources of core network information of distributing in described the 4th message, so that described the first base station sub-system is removed the local exchange of described two callings, and call out described first and to switch to the second base station sub-system.

As seen, the MSC that present embodiment is introduced can issue the information that local exchange is removed in indication in handoff procedure, do not need to increase the flow process of extra releasing local exchange, removes local exchange when switching, therefore can save the time of implementation of flow process, and the message number of saving the A interface.And, owing to do not need independent flow process to remove local exchange, therefore can not produce adverse influence to speech quality owing to removing local exchange, experience thereby can improve the user.

In implementation, the message that the first receiving element 901 receives also can comprise from the indication of the first base station sub-system switches the 5th message of finishing; Corresponding, when first resource administrative unit 903 also is used in described the first receiving element 901 and receives described the 5th message, remove resource shared when being described the first calling switching, comprise resources of core network and the resource that in the first base station sub-system, takies, thereby can save transfer resource.

In implementation, the message from the first base station sub-system that the first receiving element 901 receives also can comprise the 6th message of indicating handoff failure, carries the information of the local exchange failure of removing described two callings in described the 6th message; Corresponding, when described first resource administrative unit 903 also is used in the first receiving element 901 and receives described the 6th message, remove the resources of core network into described two call distributions.Thereby can save resources of core network, comprising the A interface resource.

With reference to Figure 10, be MSC embodiment two structural representations in the embodiment of the invention, MSC1000 comprises:

The 5th receiving element 1001 is used for receiving the message that sends from the 3rd base station sub-system, and described message comprises the 7th message that requirement is switched, and carries the information that local exchange is removed in application in described the 7th message;

The second judging unit 1002 is for the local exchange that judges whether to allow to remove two callings corresponding to described handover request message;

The 5th transmitting element 1003, be used for sending message to described the 3rd base station sub-system, described message comprises: when described the second judging unit 1002 is judged the local exchange that allows described two callings of releasing, the 8th message of handover operation is carried out in the indication that sends, and is used to indicate the local exchange that the 3rd base station sub-system is removed described two callings.

As seen, the MSC that present embodiment is introduced can make flow process and the switching flow of removing local exchange carry out simultaneously, does not need to increase the flow process of independent releasing local exchange, therefore can reduce the time of implementation of whole flow process.And, owing to adopt the message in the switching flow to transmit the needed information of local exchange of removing, therefore can reduce the message number of A interface.And flow process and the switching flow of removing local exchange carry out simultaneously, and therefore the stack of the unfavorable factor that produces in the time of also can avoiding two flow processs to carry out separately can improve the user and experience the impact of speech quality.

In implementation, go back the resources of core network information of promising described two call distributions of portability in the 7th message that the 5th transmitting element 1001 sends, thereby being called out described two, described the 3rd base station sub-system imports core net.

With reference to Figure 11, for MSC embodiment three structural representations in the embodiment of the invention, to expand on MSC embodiment two bases, the difference of MSC1100 and MSC1000 is that MSC1100 also comprises information resources administrative unit 1101, in MSC1100:

Also can comprise in the message that the 5th receiving element 1001 receives: indicate described two to call out the 8th message that switching is finished, perhaps indicate described two the 9th message of calling out handoff failure, carry the information of the local exchange failure of removing described two callings in described the 9th message;

Information resources administrative unit 1101 is used for receiving described two of indication at the 5th receiving element 1001 and calls out when switching the 8th message of finishing, and removes the resource of described two callings the 3rd shared base station sub-system when switching; Or removing is the resources of core network of described two call distributions when the 5th receiving element 1001 receives described two the 9th message of calling out handoff failure of indication.

In implementation, the message that the 5th transmitting element 1001 sends also can comprise: the second judging unit 1002 is judged when not allowing to remove the local exchange of two callings corresponding to described the 7th message, the 9th message that the described switching of refusal that sends to described the 3rd base station sub-system requires carries the indication information that does not allow to remove local exchange in described the 9th message.

With reference to Figure 12, be BSS embodiment one structural representation in the embodiment of the invention, BSS1200 comprises:

The 3rd receiving element 1201, be used for receiving the message from core-network side, described message comprises indicates the tenth message of carrying out handover operation, carries the indication information of the local exchange of removing two callings in described the tenth message, and is described two resources of core network information that calling distributes;

The first local exchange is removed unit 1202, is used for the indication information of the local exchange of two callings of releasing of carrying according to the tenth message that the 3rd receiving element 1201 receives, and removes the local exchange of described two callings;

First imports unit 1203, is used for calling out the resources of core network of distributing according to what the tenth message that the 3rd receiving element 1201 receives was carried for described two, will described two calls out the importing core net;

The first switch unit 1204 for the tenth message that receives according to the 3rd receiving element 1201, switches to the second base station sub-system with the calling of first in described two callings from the first base station sub-system.

As seen, this BSS and equipment of the core network MSC can make flow process and the switching flow of removing local exchange carry out simultaneously alternately, owing to do not need to increase the flow process of independent releasing local exchange, therefore can reduce the time of implementation of whole flow process.And, owing to adopt the message in the switching flow to transmit the needed information of local exchange of removing, therefore can reduce the message number of A interface.And flow process and the switching flow of removing local exchange carry out simultaneously, and therefore the stack of the unfavorable factor that produces in the time of also can avoiding two flow processs to carry out separately can improve the user and experience the impact of speech quality.

With reference to Figure 13, be BSS embodiment two structural representations in the embodiment of the invention, BSS1300 is on BSS embodiment one basis, can expand the 3rd transmitting element 1301, be used for when 1204 switchings of the first switch unit are finished, send message to core-network side, described message comprises the 11 message that the indication switching is finished, and calls out the resource that takies so that core-network side removes described first in the first base station sub-system.

In implementation, the 3rd transmitting element 1301 also can comprise to the message that core-network side sends: when the local exchange that can't remove described two callings or can't be described two when calling out the importing core net, the 12 message of the indication handoff failure that sends to core-network side, carry the information of the local exchange failure of removing described two callings in described the 12 message, be the resources of core network of described two call distributions so that core-network side is removed.

In implementation, the 3rd transmitting element 1301 also can comprise to the message that core-network side sends: when described the first calling can't switch to the second base station sub-system, the 12 message of the indication handoff failure that sends to core-network side, carry the wave point failure in described the 12 message, revise back the information of former channel, be the resources of core network of described two call distributions so that core-network side is removed; Corresponding, the first importing unit 1203 also is used in described first and calls out in the time of can't switching to the second base station sub-system, described two is called out import core net.

With reference to Figure 14, be BSS embodiment three structural representations in the embodiment of the invention, BSS1400 comprises:

The 4th receiving element 1401, be used for receiving the message from core-network side, comprise and indicate the 13 message of carrying out handover operation and indicate the 14 message of removing resource that the indication information that carries the local exchange of removing two callings in described the 13 message reaches the resources of core network information of distributing for the calling of second in described two callings;

The second switch unit 1402, the information for the 13 message that receives according to the 4th receiving element 1401 is carried switches to the second base station sub-system with the calling of first in described two callings from the first base station sub-system;

The second local exchange is removed unit 1403, is used for removing the local exchange of described two callings when the 4th receiving element 1401 receives 14 message;

Second imports unit 1404, is used for when the 4th receiving element 1401 receives 14 message, calls out described second and imports core net.

With reference to Figure 15, be BSS embodiment four structural representations in the embodiment of the invention, on BSS embodiment three bases, expansion Secondary resource administrative unit 1501, be used for after the importing core net is called out with described second in the second importing unit 1404, removing the resource of the first shared base station sub-system of described the second calling.

On BSS embodiment three or four bases, also can further expand, so that expansion describes on BSS embodiment four bases, with reference to Figure 16, be BSS embodiment five structural representations in the embodiment of the invention, BSS1600 is on BSS embodiment four bases, expand the 4th transmitting element 1601, be used for sending message to core net, described message comprises: in the time can't calling out the importing core net or can't remove the local exchange of described two callings described first, the 16 message of the indication handoff failure that sends to core-network side is called out the resources of core network of distributing so that core-network side is removed as described two, calls out and continues to carry out local exchanges for described two; Perhaps, when described the first calling can't switch to the second base station sub-system, and the 16 message of the indication handoff failure that sends to core-network side, carry the wave point failure in described the 16 message, revise back the information of former channel, be the resources of core network of described two call distributions so that core-network side is removed.

With reference to Figure 17, be BSS embodiment six structural representations in the embodiment of the invention, BSS1700 comprises:

The 6th receiving element 1701, be used for receiving the message from core-network side, described message comprises the 17 message of indication execution handover operation, carry the indication information of the local exchange of removing two callings in described the 17 message, and be described two resources of core network information that calling distributes;

The 3rd local exchange is removed unit 1702, is used for the indication information of the local exchange of two callings of releasing of carrying according to the 17 message that the 6th receiving element 1701 receives, and removes the local exchange of described two callings;

The 3rd imports unit 1703, is used for calling out the resources of core network of distributing according to what the 17 message that the 6th receiving element 1701 receives was carried for described two, will described two calls out the importing core net;

The 3rd switch unit 1704 is used for receiving the 17 message according to described Unit the 6th, first in described two callings is called out switch to the second residential quarter from the first residential quarter.

Can find out that the BSS that present embodiment is introduced removes local exchange by cooperating with equipment of the core network MSC when can be implemented in switching, therefore can save the time of implementation of flow process, and the message number of saving the A interface.And, owing to do not need independent flow process to remove local exchange, therefore can not produce adverse influence to speech quality owing to removing local exchange, experience thereby can improve the user.

Concrete application can referring to the application scenarios of the embodiment of the method for removing local exchange, repeat no more in above-mentioned MSC and the BSS equipment.

More than by global system for mobile communications (GSM, Global System for MobileCommunications) the concrete application in has been described in detail, be understandable that, the method of setting up local exchange of introducing in the embodiment of the invention can be applied to Wideband Code Division Multiple Access (WCDMA) (WCDMA equally, Wideband Code Division Multiple Access), TD SDMA (TD-SCDMA, Time Division Synchronous Code Division Multiple Access) and long-term evolving network (LTE, Long Term Evolution) and in other wireless communication systems, corresponding equipment then (comprises radio network controller (RNC (Radio Network Controller) and base station (NodeB)) for equipment of the core network (as: MSC server) and base station sub-system corresponding in the system.Illustrate no longer one by one.

Be understandable that, employed first, second grade limits the attribute of system, equipment or unit in the embodiment of the invention, do not represent a definite sequence, just for convenience of description, the function of the embodiment of the invention is used for distinguishing different systems, equipment or unit, as long as can be realized in described system, equipment or unit.

One of ordinary skill in the art will appreciate that all or part of step in the whole bag of tricks of above-described embodiment is to come the relevant hardware of instruction finish by program, this program can be stored in the computer-readable recording medium, and storage medium can comprise: ROM, RAM, disk or CD etc.

More than method, equipment of the core network and the base station sub-system of releasing local exchange that the embodiment of the invention is provided be described in detail, used specific case herein principle of the present invention and execution mode are set forth, the explanation of above embodiment just is used for helping to understand method of the present invention and core concept thereof; Simultaneously, for one of ordinary skill in the art, according to thought of the present invention, all will change in specific embodiments and applications, in sum, this description should not be construed as limitation of the present invention.

Claims

1. a method of removing local exchange is characterized in that, comprising:

2. the method for releasing local exchange as claimed in claim 1 is characterized in that,

Describedly comprise for described two call distribution resources of core network: be 3 resources of core network of described two call distributions, wherein, the first resources of core network and the second resources of core network are used for the first base station sub-system the importing core net are called out in the first calling and second, and the 3rd resources of core network is used for the second base station sub-system and calls out importing the second base station sub-system with first;

Carry in described the 4th message that sends to the first base station sub-system: indication information and first resources of core network of distributing and the second resources of core network information of removing the local exchange of described two callings.

3. the method for releasing local exchange as claimed in claim 1 is characterized in that,

Describedly comprise for described two call distribution resources of core network: be 2 resources of core network of described two call distributions, wherein, the first resources of core network is used for the second base station sub-system and calls out the importing core net with described first, and the second resources of core network is used for the first base station sub-system described the second calling is imported core net;

Carry in described the 4th message that sends to the first base station sub-system: remove described two callings local exchange indication information and be the resources of core network information of described the second call distribution.

4. such as the method for each described releasing local exchange of claims 1 to 3, it is characterized in that, further comprise:

Reception is switched the 5th message of finishing from the indication of the first base station sub-system, removes described first and call out resources of core network shared when switching and the resource that takies in the first base station sub-system;

Perhaps, reception is from the 6th message of the indication handoff failure of the first base station sub-system, when carrying the information of the local exchange failure of removing described two callings in described the 6th message, stop switching, and removing is the resources of core network of described two call distributions;

Perhaps, reception is from the 6th message of the indication handoff failure of the first base station sub-system, in described the 6th message, carry the wave point failure, when revising back the indication information of former channel, according to the wave point failure of carrying in described the 6th message, revise back the indication information of former channel, carry out handoff failure and process, and removing is the resources of core network of described two call distributions.

5. a method of removing local exchange is characterized in that, comprising:

6. the method for releasing local exchange as claimed in claim 5 is characterized in that, when the calling of first in two callings is switched to the second base station sub-system, further comprises:

Send indication to core-network side and switch the 8th message of finishing.

7. the method for releasing local exchange as claimed in claim 5 is characterized in that, further comprises:

When the local exchange that can't remove described two callings maybe can't be called out the importing core net with described two, send the 9th message of indicating handoff failure to core-network side, carry the information of the local exchange failure of removing described two callings in described the 9th message;

Perhaps, when described the first calling can't switch to the second base station sub-system, described two callings are imported core net, and send the 9th message of indication handoff failure to core-network side, carry the wave point failure in described the 9th message, revise back the information of former channel.

8. a method of removing local exchange is characterized in that, comprising:

9. the method for releasing local exchange as claimed in claim 8 is characterized in that, will further comprise after described the second calling importing core net:

The resource of the first shared base station sub-system when removing described the second calling switching.

10. remove as claimed in claim 8 or 9 the method for local exchange, it is characterized in that, further comprise:

In the time can't calling out the importing core net or can't remove the local exchange of described two callings described first, send the 12 message of indication handoff failure to core-network side;

Perhaps, when described the first calling can't switch to the second base station sub-system, keep the local exchange of described two callings, and send the 12 message of indication handoff failure to core-network side, carry the wave point failure in described the 12 message, revise back the information of former channel.

11. a method of removing local exchange is characterized in that, comprising:

When determining to allow to remove the local exchange of two callings corresponding to described the 13 message, send the 14 message that handover operation is carried out in indication to described the 3rd base station sub-system, indicate the 3rd base station sub-system to remove the local exchange of described two callings, also carry the resources of core network information into described two call distributions in described the 14 message.

12. the method for releasing local exchange as claimed in claim 11 is characterized in that, further comprises:

When receiving 15 message of finishing from described two the calling switchings of the indication of the 3rd base station sub-system, remove the resource of described two callings the 3rd shared base station sub-system when switching;

Perhaps, receive from described two the 16 message of calling out handoff failure of the indication of the 3rd base station sub-system, carry the information of the local exchange failure of removing described two callings in described the 16 message; According to the information of the local exchange failure of described two callings of releasing of carrying in described the 16 message, stop switching, and remove and be the resources of core network of described two call distributions.

13. the method such as each described releasing local exchange of claim 11 to 12 is characterized in that, when receiving 13 message of the requirement switching that sends from the 3rd base station sub-system, further comprises:

When determining not allow to remove the local exchange of two callings corresponding to described handover request message, send the 17 message that the described switching of refusal requires to described the 3rd base station sub-system, carry the indication information that does not allow to remove local exchange in described the 17 message.

14. an equipment of the core network is characterized in that, comprising:

The first judging unit is used for corresponding two zones of calling out after switching of the first message of judging that described the first receiving element receives;

15. equipment of the core network as claimed in claim 14 is characterized in that, the message that described the first receiving element receives also comprises from the indication of the first base station sub-system switches the 5th message of finishing;

Described first resource administrative unit also is used for when described the first receiving element receives described the 5th message, removes the resources of core network that takies when switching for described the first calling and the resource that takies in the first base station sub-system.

16. equipment of the core network as claimed in claim 14, it is characterized in that, the message from the first base station sub-system that described the first receiving element receives also comprises the 6th message of indicating handoff failure, carries the information of the local exchange failure of removing described two callings in described the 6th message;

Described first resource administrative unit also is used for removing the resources of core network into described two call distributions when described the first receiving element receives described the 6th message.

17. an equipment of the core network is characterized in that, comprising:

The 5th transmitting element, be used for sending message to described the 3rd base station sub-system, described message comprises: when described the second judgment unit judges allows to remove the local exchange of described two callings, the 8th message of handover operation is carried out in the indication that sends, and is used to indicate the local exchange that the 3rd base station sub-system is removed described two callings; Also carry the resources of core network information of promising described two call distributions in the 7th message that described the 5th transmitting element sends.

18. equipment of the core network as claimed in claim 17, also comprise in the message that described the 5th receiving element receives: indicate described two to call out the 8th message that switching is finished, or indicate described two the 9th message of calling out handoff failure, carry the information of the local exchange failure of removing described two callings in described the 9th message;

Also comprise the information resources administrative unit, be used for receiving described two of indication at described the 5th receiving element and call out when switching the 8th message of finishing, remove the resource of described two callings the 3rd shared base station sub-system when switching; Or removing is the resources of core network of described two call distributions when described the 5th receiving element receives described two the 9th message of calling out handoff failure of indication.

19. equipment of the core network as claimed in claim 17, it is characterized in that, the message that described the 5th transmitting element sends also comprises: when described the second judgment unit judges does not allow to remove the local exchange of two callings corresponding to described the 7th message, the 9th message that the described switching of refusal that sends to described the 3rd base station sub-system requires carries the indication information that does not allow to remove local exchange in described the 9th message.

20. a base station sub-system is characterized in that, comprising:

21. base station sub-system as claimed in claim 20 is characterized in that, also comprises:

The 3rd transmitting element is used for sending message to core-network side, and described message comprises the 11 message that the indication switching is finished.

22. base station sub-system as claimed in claim 21, it is characterized in that, described the 3rd transmitting element also comprises to the message that core-network side sends: when the local exchange that can't remove described two callings or can't be described two when calling out the importing core net, the 12 message of the indication handoff failure that sends to core-network side carries the information of the local exchange failure of removing described two callings in described the 12 message.

23. base station sub-system as claimed in claim 21, it is characterized in that, described the 3rd transmitting element also comprises to the message that core-network side sends: when described the first calling can't switch to the second base station sub-system, the 12 message of the indication handoff failure that sends to core-network side, carry the wave point failure in described the 12 message, revise back the information of former channel;

Described first imports the unit also is used for when described the first calling can't switch to the second base station sub-system, described two is called out import core net.

24. a base station sub-system is characterized in that, comprising:

25. base station sub-system as claimed in claim 24, it is characterized in that, also comprise the Secondary resource administrative unit, be used for after the importing core net is called out with described second in described the second importing unit, removing the resource of the first shared base station sub-system of described the second calling.

26. such as claim 24 or 25 described base station sub-systems, it is characterized in that, also comprise the 4th transmitting element, be used for sending message to core net, described message comprises: in the time can't call out importing core net or can't remove the local exchange of described two callings described first, and the 16 message of the indication handoff failure that sends to core-network side; Perhaps, call out when can't switch to the second base station sub-system when described first, and the 16 message of the indication handoff failure that sends to core-network side, carry the wave point failure in described the 16 message, revise back the information of former channel.

27. a base station sub-system is characterized in that, comprising: