CN101841864B

CN101841864B - Call control method and system

Info

Publication number: CN101841864B
Application number: CN 200910129314
Authority: CN
Inventors: 李靖; 王欣晖; 王东; 况振东
Original assignee: ZTE Corp
Current assignee: ZTE Corp
Priority date: 2009-03-19
Filing date: 2009-03-19
Publication date: 2013-03-27
Anticipated expiration: 2029-03-19
Also published as: CN101841864A

Abstract

The invention discloses call control method and system. In the method, MSC (Mobile Switching Center) Server sends a request message of converting an IP chain to a TDM (Time Division Multiple)chain corresponding to the current call to a BSC (Base Station Controller), wherein the request message of converting the IP chain to the TDM chain carries the identifier information of a TDM chain; BSC responses to the request message of converting the IP chain to the TDM chain, stops using the IP chain to carry the current call and uses the TDM chain corresponding to the identifier information of the TDM chain in the request message of converting the IP chain to the TDM chain to carry the current call; MGW (Media Gateway) stops using the IP chain to carry the current call and uses the TDM chain to carry the current call. By using the invention, inter-conversion of chain carrying according to request can be performed, thereby improving the capacity of network side equipment to adjust resources.

Description

Calling-control method and system

Technical field

The present invention relates to the communications field, in particular to a kind of calling-control method and system.

Background technology

Along with the development of the third generation (3rd Generation) mobile communcations system, after 3GPP was the 4th edition, core net had realized separating of control and carrying.Fig. 1 is the system architecture diagram based on the gsm communication network of IP carrying according to correlation technique.

As shown in Figure 1, the gsm communication network comprises: portable terminal (Mobile Station, referred to as MS) 60, base transceiver station (Base Transceiver Station, referred to as BTS) 50, base station controller (Base Station Controller, referred to as BSC) 20, codec unit (Trans-coder, referred to as TC) 40, media gateway (MediaGateway, referred to as MGW) 30, Mobile Switching Center Server (Mobile SwitchingCenter Server is referred to as MSC Server) 10.Wherein, communicate, be connected, communicate, be connected by Mc interface between MSC Server 10 and the MGW 30 by the A interface between BSC 20 and MGW 30 and BSC 20 and the MSC Server 10 by Abis interface between BTS 50 and the BSC 20 by the air interface Um Interface between MS 60 and the BTS 50.TC 40 can be arranged at BSC 20 or MGW 30 or arrange separately.

Wherein, MSC Server is mainly used in the control to signaling and calling, MGW then is mainly used in providing service bearer, MGW can be used as destination node and processes from the Bearer Channel of Circuit Switching Network or the data flow of Packet Based Network, and, also support media conversion of MGW, Bearer Control and load are processed, and for example, carry out coding/decoding, echo inhibition, conference etc.Connect by Mc interface between MSC Server and the MGW, MSC Server finishes control to MGW by Mc interface.

Wherein, the A interface is based on time division multiplexing (Time Division Multiple, referred to as TDM) carry, transmission is pulse code modulation (Pulse Code Modulation is referred to as PCM) the speech coding signal of 64Kbps thereon; Aloft on the interface Um interface, transmission be the compressed voice code signal; Wherein, BSC has code conversion and rate adaptation function unit (Trans-code Rate Adaption Unit, referred to as TRAU), finish the voice rate adaption function, the unit of realizing this function is codec unit (Trans-coder, referred to as TC), the conversion of the PCM speech coding of the 64Kbps that transmits in the compressed voice coding that TC is mainly used in transmitting in the Abis interface and the A interface.

Along with the advantage of IP technology in mobile radio communication, the A interface progressively adopts based on IP carrying (being A Interface Over IP, referred to as AoIP).But when needs are vacated an IP resource of using, or the user is when wishing to use the TDM resource, and needing to be to carry based on TDM based on the Call Transfer of IP carrying.At present, the problem for link bearer can not be changed according to demand not yet proposes effective technical scheme in the correlation technique.

Summary of the invention

Consider the problem that the carrying of correlation technique link can not be changed according to demand and propose the present invention, for this reason, main purpose of the present invention is to provide a kind of calling-control method and system, to solve the problems referred to above that exist in the correlation technique.

To achieve these goals, according to an aspect of the present invention, provide a kind of calling-control method.

According to calling-control method of the present invention, be used for the A interface link by be converted to the link bearer based on time division multiplexing TDM based on the IP link bearer, the method comprises: the IP link that core net sends corresponding current calling to wireless network turns the request message of TDM link, wherein, the IP link turns the identification information that carries the TDM link in the request message of TDM link; The BSC of wireless network response IP link turns the request message of TDM link, stops using the current calling of IP link bearer, and use and IP link turn the current calling of TDM link bearer corresponding to identification information of the TDM link in the request message of TDM link; The MGW of core net stops using the current calling of IP link bearer, and uses the current calling of TDM link bearer.

Preferably, before MSC Server turned the request message of TDM link to BSC transmission IP link, the method also comprised: thus MSC Server searches and determine the TDM link.

Preferably, after using the current calling of TDM link bearer, the method also comprises: wireless network sends the response message that corresponding IP link turns the request message of TDM link to core net; After core net receives response message, the IP link of the current calling of releasing bearing.

Preferably, use at the A interface link in the situation of coded system of pulse code modulation speech, BSC uses and turns the current calling of TDM link bearer corresponding to the identification information of the TDM link in the request message of TDM link with described IP link and comprise: BSC carries current calling in the coded system of TDM link use pulse code modulation speech.

Preferably, use at the A interface link in the situation of coded system of compressed voice, BSC uses and to turn the current calling of TDM link bearer corresponding to the identification information of the TDM link in the request message of TDM link with the IP link and comprise: be sent to the data of core net for wireless network, the codec unit TC of wireless network is converted to the coded system of compressed voice the coded system of pulse code modulation speech; TC uses the TDM link data of the coded system of pulse code modulation speech to be sent to the MGW of core net.

Preferably, use at the A interface link in the situation of coded system of compressed voice, BSC uses and to turn the current calling of TDM link bearer corresponding to the identification information of the TDM link in the request message of TDM link with the IP link and comprise: be sent to the data of core net for wireless network, the codec unit TC of wireless network is converted to the coded system of compressed voice the coded system of pulse code modulation speech; The TC of wireless network uses the TDM link data of the coded system of pulse code modulation speech to be sent to the TC of core net; The TC of core net is converted to the coded system of compressed voice with the coded system of the pulse code modulation speech of the data that receive, and sends data to the MGW of core net.

Preferably, the MGW of core net uses the current calling of TDM link bearer to comprise: pass to the data of wireless network for core net, the TC of core net is converted to the coded system of compressed voice the coded system of pulse code modulation speech; Core net uses the TDM link data of the coded system of pulse code modulation speech to be sent to the BSC of wireless network.

According to a further aspect in the invention, also provide a kind of call control system.

Call control system according to the present invention comprises: core net and wireless network, wherein, A interface between core net and the wireless network is based on the IP link bearer, core net comprises: the first sending module, turn the request message of TDM link for the IP link that sends corresponding current calling, wherein, the IP link turns the identification information that carries the TDM link in the request message of TDM link; The first adjusting module is used for stopping using the described current calling of IP link bearer, discharges the IP resource, and uses the current calling of described TDM link bearer, and perhaps above-mentioned module can be used for using IP link and TDM link to carry simultaneously current calling simultaneously; Wireless network comprises: the first receiver module is used for receiving the request message that the IP link turns the TDM link; The second adjusting module, the IP link that is used for the reception of response the first receiver module turns the request message of TDM link, stop using the current calling of IP link bearer, and use and IP link turn the current calling of TDM link bearer corresponding to identification information of the TDM link in the request message of TDM link.

Preferably, wireless network also comprises: the second sending module is used for sending the response message that corresponding IP link turns the request message of TDM link.

Preferably core net also comprises: the second receiver module is used for receiving the response message from the second sending module; Release module is used for the response message according to the reception of the second receiver module, the IP resource of the current calling of releasing bearing.

Preferably, this system also comprises: coding/decoding module, and for the coded system that the coded system of compressed voice is converted to the pulse code modulation speech.

By means of technique scheme of the present invention, the IP link that sends the identification information carry the TDM link to BSC by MSC Server turns the request message of TDM link, BSC is converted to TDM link bearer corresponding to this identification information with A chain of interfaces routing IP link bearer, can carry out according to demand the mutual conversion of link bearer, improve the ability that the network equipment resource is adjusted.

Description of drawings

Accompanying drawing described herein is used to provide a further understanding of the present invention, consists of the application's a part, and illustrative examples of the present invention and explanation thereof are used for explaining the present invention, do not consist of improper restriction of the present invention.In the accompanying drawings:

Fig. 1 is the system architecture diagram based on the gsm communication network of IP carrying according to correlation technique;

Fig. 2 is the flow chart according to the calling-control method of the embodiment of the invention;

Fig. 3 is the schematic diagram of the application scenarios of example one according to the present invention;

Fig. 4 is the schematic diagram of processing scene that the method that provides according to the inventive method embodiment is provided;

Fig. 5 is the schematic diagram of the application scenarios of example two according to the present invention;

Fig. 6 is the schematic diagram that another processing scene of the method that provides according to the inventive method embodiment is provided;

Fig. 7 is the schematic diagram of the application scenarios of example three according to the present invention;

Fig. 8 is the schematic diagram of the application scenarios of example four according to the present invention;

Fig. 9 is the schematic diagram of the application scenarios of example five according to the present invention;

Figure 10 is the schematic diagram of the application scenarios of example six according to the present invention;

Figure 11 is the schematic diagram of the application scenarios of example seven according to the present invention;

Figure 12 is the schematic diagram of the application scenarios of example eight according to the present invention;

Figure 13 is the block diagram according to the call control system of the embodiment of the invention;

Figure 14 is the block diagram according to the preferred structure of the call control system of the embodiment of the invention.

Embodiment

Functional overview

Main thought of the present invention is: judge in the inside that receives lower floor's message or MSC, when initiation be the calling of carrying based on TDM based on the Call Transfer of IP carrying, the IP link that MSCServer sends the identification information carry the TDM link to BSC turns the request message of TDM link, after BSC receives this IP link and turns the request message of TDM link, A chain of interfaces routing IP link bearer is converted to TDM link bearer corresponding to this identification information.By the embodiment of the invention, can carry out according to demand the mutual conversion of link bearer, thereby improve the ability that the network equipment resource is adjusted.

Below in conjunction with accompanying drawing the preferred embodiments of the present invention are described, should be appreciated that preferred embodiment described herein only is used for description and interpretation the present invention, is not intended to limit the present invention.If do not conflict, feature can make up mutually among the embodiment of the invention and the embodiment.

Embodiment of the method

According to the embodiment of the invention, a kind of calling-control method is provided, be used for the A interface link by be converted to the link bearer based on TDM based on the IP link bearer.

Fig. 2 is the flow chart according to the calling-control method of the embodiment of the invention.Need to prove, the step of describing in following methods can be carried out in the computer system such as one group of computer executable instructions, and, although figure 2 illustrates logical order, but in some cases, can carry out step shown or that describe with the order that is different from herein.As shown in Figure 2, the method comprises following processing:

Step S202, the IP link that MSC Server sends corresponding current calling to BSC turns the request message of TDM link, and wherein, the IP link turns the identification information that carries the TDM link in the request message of TDM link;

Step S204, BSC response IP link turns the request message of TDM link, stops using the current calling of IP link bearer, and the use TDM link bearer current calling corresponding with the identification information of TDM link.

Step S206, MGW stop using the current calling of IP link bearer, and use the current calling of TDM link bearer.

The below describes above-mentioned each details of processing in detail.

(1) step S202

When needs will be adjusted into the calling of carrying based on TDM based on the calling of IP carrying (for example: need to vacate an IP resource of using), initiation will be to adjust flow process based on the resource of TDM carrying based on the Call Transfer of IP carrying, can initiate by the judgement of lower floor's message or MSC inside.

At first, MSC Server need to determine a TDM link, and MSC Server can search a TDM link in the TDM of free time link, and the method for searching does not specifically limit herein.

Then, the IP link that MSC Server sends the identification information carry the TDM link to BSC turns the request message of TDM link, and this IP link turns the identification information that carries the TDM link that MSC Server determines in the request message of TDM link; This IP link turns the request message of TDM link by being used for transmitting the link transmission of user's chain of command message between MSC Server and the BSC, the link that its use is arranged is called out on every road, and wireless network can be known the calling of carrying out the link adjustment according to the link of receiving this message.

(2) step S204 and S206

BSC receives the request message that this IP link turns the TDM link, stops using the current calling of IP link bearer, and according to the identification information of wherein TDM link, uses the TDM link bearer current calling corresponding with this identification information.

Wherein, use pulse code modulation (Pulse Code Modulation at the A interface link, referred to as PCM) in the situation of the coded system of speech, be sent to the data of core net for wireless network, the TC of wireless network is converted to the coded system of pulse code modulation speech with the coded system of compressed voice, and will use the data of the coded system of PCM speech to send the MGW of core net in the TDM link; Perhaps, the TC of wireless network is sent to the data of the coded system of above-mentioned use PCM speech the TC of core net, the coded system of the pulse code modulation speech of the above-mentioned data that this TC will receive is converted to the coded system of compressed voice, and above-mentioned data are sent to MGW.Preferably, PCM speech coding mode is speech coding mode G.711.Correspondingly, be sent to the data of core net for wireless network, the TC of core net is converted to the coded system (G.711 speech coding) of PCM speech with the coded system of compressed voice, and sends the BSC of wireless network in the coded system of this TDM link use PCM speech.

Based on above-mentioned processing, after using the current calling of TDM link bearer, BSC sends the response message that corresponding IP link turns the request message of TDM link to MSC Server, after MSC Server receives response message, the IP link of the current calling of releasing bearing, thus can use the IP resource of vacating to carry out other the high business of priority level.

By above-described embodiment, can carry out according to demand the conversion of link bearer with the A interface link by carrying is converted to the carrying based on TDM based on IP, improved the flexibility of link bearer conversion.

Below in conjunction with a plurality of application scenarioss technical scheme of the present invention is described.In a plurality of application scenarioss below, core net comprises: the network elements such as MSC Server, MGW, TC, and wherein, TC can be arranged at MGW, also can arrange separately; Wireless network comprises: the network elements such as BSC, TC, wherein, TC can be arranged at BSC, also can arrange separately.

Example one

Fig. 3 is the schematic diagram of the application scenarios of example one according to the present invention, as shown in Figure 3, both can use the TDM link transmission between wireless network and the core net, can use the IP link transmission again, be transmission based on the IP link if a certain calling is current, used TC at wireless network, and but core net does not have TC or core net that TC is arranged do not use, and use G.711 speech coding mode at the A interface.Concrete, the TC of wireless network is speech coding G.711 with the compressed voice code conversion that receives, again by IP carrying general G.711 speech coding be transferred to MGW.

For MSC Server, at first need to prepare a TDM link, in the TDM of free time link, select a TDM link, then, MSC Server sends the request message that the IP link turns the TDM link to BSC, this IP link turns the identification information (identifier) that carries the TDM link of selecting in advance in the request message of TDM link, be used for notice BSC should call out will use the TDM link.

After BSC receives this IP link and turns the request message of TDM link, carry out link change operation.Particularly, wireless network stops using the IP transmission link to carry this calling, and be converted to the corresponding TDM transmission link of TDM transmission sign that uses the IP link to turn to carry in the request message of TDM link and carry this callings, simultaneously in TDM transmission use coded system G.711.Preferably, BSC replys MSC and converts message after finishing link and adjusting, and this message is used for BSC and informs that MSC calls out BSC and finished the operation that the IP link turns the TDM link.

MGW stops using this calling of IP link bearer when MSC sends the IP link and turns the message of TDM link, and changes use IP link into and turn the TDM that carries in the message of TDM link and identify corresponding this calling of TDM link bearer.Preferably, when MGW sends this message at MSC, also can use simultaneously IP link and this calling of TDM link bearer.MGW receives after the data of wireless network transmission at the TDM of appointment link or MSCServer receives that BSC sends convert message after, think that wireless network finished the link conversion that IP turns TDM, MGW stops using the IP transmission link to carry this calling, and be converted to the corresponding TDM transmission link of TDM transmission sign that uses the IP link to turn to carry in the request message of TDM link and carry this calling, and discharge the IP link circuit resource.

BSC and MGW are in TDM transmission use coded system G.711.As shown in Figure 4, be transferred to the data of core net for wireless network, the TC of wireless network is converted to G.711 speech coding signal with the compressed voice code signal that receives, again by the TDM link G.711 the speech coding signal be transferred to MGW.Be transferred to the data of wireless network for core net, directly G.711 the speech coding signal is by the TC of TDM link transmission to wireless network for MGW, and the TC of wireless network will pass to BSC after will being converted to compressed encoding from the G.711 speech coding that MGW receives.

Example two

By the description to example one, can find out, the above-mentioned calling that will change into based on the TDM link bearer based on the calling of IP carrying is at wireless network tc unit being arranged, and core-network side does not have the TC of TC or core net not use, and use G.711 speech coding mode at the A interface, but the invention is not restricted to this.

Fig. 5 is the schematic diagram of the application scenarios of example two according to the present invention.As shown in Figure 5, wireless network and core net have all been used tc unit, and use G.711 speech coding mode at the A interface, and use the compressed voice coded system between the TC of MGW and core net.Concrete, the TC of wireless network is converted to G.711 speech coding with the compressed voice coding 1 that receives, then by the IP link will be G.711 speech coding be transferred to the TC of core net, this TC sends MGW to after G.711 speech coding is converted to compressed voice coding 2 again.

Need explanation, compressed voice coding 1 herein both can be two kinds of different compressed voice coded systems with compressed voice coding 2, also can be identical compressed voice coded system.

The below carries out the A interface link by the processing that is converted to based on the IP link bearer based on the TDM link bearer, and detailed process can with reference to processing shown in Figure 2, not given unnecessary details herein.

After BSC carries conversion process, as shown in Figure 6, be transferred to the data of core net for wireless network, the TC of wireless network is converted to G.711 speech coding with the compressed voice coding 1 that receives, again by TDM will be G.711 speech coding be transferred to the TC of core net, then this TC sends MGW to after G.711 speech coding is converted to compressed voice coding 2.Be transferred to the data of wireless network for core net, the MGW of core net sends compressed voice coding 2 to the TC of core net, the TC of core net is converted to the TC that is transferred to wireless network behind the speech coding G.711 by TDM with speech coding 2, and the TC of wireless network will pass to BSC after will being converted to compressed encoding from the G.711 speech coding that core net receives.

Example three

Fig. 7 is the schematic diagram of the application scenarios of example three according to the present invention.As shown in Figure 7, wireless network has TC but does not use, and core net has TC also not use, and uses the compressed voice coded system at the A interface, that is, BSC directly sends the compressed voice coding to MGW by the IP transmission.

After BSC carried conversion process, BSC can not directly send the compressed voice coding to MGW by the TDM transmission.As shown in Figure 6, be transferred to the data of core net for wireless network, the TC of wireless network is speech coding G.711 with the compressed voice code conversion that receives, again by TDM transmission G.711 speech coding send the TC of core net to, this TC sends MGW at speech coding G.711 to after being converted to the compressed voice coding.Herein, the conversion carried out of the TC of core net is in order to make MGW use the coded system that receives before and after the TDM transmission consistent being converted to.Also can not carry out in theory the TC conversion of core net, but need to increase the processing of MGW, because MGW is the compression coding mode that uses before using the IP transmission.

Be transferred to the data of wireless network for core net, the MGW of core net sends the compressed voice coding to the TC of core net, the TC of core net is converted to the TC that is transferred to wireless network behind the speech coding G.711 by TDM with speech coding, and the TC of wireless network will pass to BSC after will being converted to compressed encoding from the G.711 speech coding that core net is received.

Example four

Fig. 8 is the schematic diagram of the application scenarios of example four according to the present invention.As shown in Figure 8, wireless network has TC but does not use, and core net has been used 1 TC, and use the compressed voice coded system at the A interface, namely, BSC directly sends the compressed voice coding TC of core net to by IP transmission, the TC of core net with the compressed voice code conversion for G.711 sending again MGW to after the speech coding mode.

After BSC carries conversion process, BSC can not directly send the compressed voice coding to by the TDM transmission TC of core net, as shown in Figure 6, be transferred to the data of core net for wireless network, the TC of wireless network is speech coding G.711 with the compressed voice code conversion that receives, again by the TDM transmission G.711 speech coding send the MGW of core net to.Be transferred to the data of wireless network for core net, G.711 the MGW of core net directly is transferred to the TC of wireless network behind the speech coding by TDM, and the TC of wireless network will pass to BSC after will being converted to compressed encoding from the G.711 speech coding that core net is received.

Example five

Fig. 9 is the schematic diagram of the application scenarios of example five according to the present invention.As shown in Figure 9, wireless network has TC but does not use, and core net has been used 2 TC, and use compressed voice coded system 1 at the A interface, that is, BSC directly sends the compressed voice coding TC (TC1) of core net to by IP transmission, this TC1 with the compressed voice code conversion for sending again another TC (TC2) of core net after the speech coding mode G.711 to, this TC2 G.711 speech coding is converted to compressed voice and encodes and send MGW to after 2 modes again, as shown in Figure 7.

After BSC carries conversion process, BSC can not directly send the compressed voice coding to by the TDM transmission TC of core net, as shown in Figure 4, be transferred to the data of core net for wireless network, the TC of wireless network is converted to G.711 speech coding with the compressed voice coding 1 that receives, again by TDM transmission G.711 speech coding send the TC (TC1 or TC2) of core net to, the G.711 speech coding that the TC of core net will receive sends MGW to after being converted to compressed voice coding 2 again.Be transferred to the data of wireless network for core net, the MGW of core net sends compressed voice coding 2 to the TC of core net, the TC of core net is converted to the TC that is transferred to wireless network behind the speech coding G.711 by TDM with speech coding 2, and the TC of wireless network will pass to BSC after will being converted to compressed encoding 1 from the G.711 speech coding that core net is received.

Example six

Figure 10 is the schematic diagram of the application scenarios of example six according to the present invention.As shown in figure 10, wireless network has used 2 TC (TC1 and TC2), and core net has TC but not do not use, and uses the compressed voice coded system at the A interface.The TC1 of wireless network is speech coding G.711 with the compressed voice code conversion that receives, then this TC1 G.711 speech coding pass to TC2, this TC2 G.711 speech coding is converted to compressed voice coding 2, and then by the IP link transmission to MGW.

Need explanation, compressed voice coding 1 herein both can be two kinds of different compressed voice coded systems with compressed voice coding 2, also can be two kinds of identical compressed voice coded systems.

After BSC carried conversion process, wireless network no longer needed to use 2 TC to carry out encoding and decoding, and only needing 1 TC is the mode of speech coding G.711 with the compressed voice code conversion.As shown in Figure 6, be transferred to the data of core net for wireless network, the TC of wireless network is converted to G.711 speech coding with the compressed voice coding 1 that receives, again by TDM transmission G.711 speech coding send the TC of core net to, the TC of core net sends MGW to again with after G.711 speech coding is converted to compressed voice coding 2.Be transferred to the data of wireless network for core net, the MGW of core net sends compressed voice coding 2 to the TC of core net, the TC of core net is converted to the TC that is transferred to wireless network behind the speech coding G.711 by TDM with speech coding 2, and the TC of wireless network will pass to BSC after will being converted to compressed encoding 1 from the G.711 speech coding that core net is received.

Example seven

Figure 11 is the schematic diagram of the application scenarios of example seven according to the present invention.As shown in figure 11, wireless network has TC but does not use, and core net has been used 1 TC, and uses compressed voice coded system 1 at the A interface.Concrete, BSC directly transmits the TC that compressed voice coding 1 is sent to core net by IP, and this TC sends MGW to after compressed voice coding 1 is converted to compressed voice coding 2.

After BSC carries conversion process, BSC can not directly send compressed voice coding 1 to by the TDM transmission TC of core net, as shown in Figure 6, be transferred to the data of core net for wireless network, the TC of wireless network is converted to G.711 speech coding with the compressed voice coding 1 that receives, again by TDM transmission G.711 speech coding send the TC of core net to, the TC of core net G.711 speech coding sends MGW to after being converted to compressed voice coding 2.Be transferred to the data of wireless network for core net, the MGW of core net sends compressed voice coding 2 to the TC of core net, the TC of core net is converted to the TC that is transferred to wireless network behind the speech coding G.711 by TDM with speech coding 2, and the TC of wireless network will pass to BSC after will being converted to compressed encoding 1 from the G.711 speech coding that core net is received.

Example eight

Figure 12 is the schematic diagram of the application scenarios of example eight according to the present invention.As shown in figure 12, wireless network has used 1 TC, and core net has TC but not do not use, and uses the compressed voice coded system at the A interface.Concrete, the TC of wireless network is converted to compressed voice coding 2 with the compressed voice coding 1 that receives, and then by the IP link compressed voice coding 2 is transferred to MGW.

After BSC carries conversion process, as shown in Figure 6, be transferred to the data of core net for wireless network, the TC of wireless network is converted to G.711 speech coding with the compressed voice coding 1 that receives, again by TDM transmission G.711 speech coding send the TC of core net to, the TC of core net G.711 speech coding sends MGW to after being converted to compressed voice coding 2.Be transferred to the data of wireless network for core net, the MGW of core net sends compressed voice coding 2 to the TC of core net, the TC of core net is converted to the TC that is transferred to wireless network behind the speech coding G.711 by TDM with speech coding 2, and the TC of wireless network will pass to BSC after will being converted to compressed encoding 1 from the G.711 speech coding that core net is received.

Preferably, to example eight, BSC is after carrying out link change operation at above-mentioned example one, can return response message to MSC Server, and in this response message, carry above-mentioned TDM link identifier, and MSC Server is after receiving answer message, call release is the IP resource of use originally.

Above-mentioned example one to example eight has been described a plurality of application scenarioss according to the embodiment of the invention, and still, application scenarios of the present invention is not limited to this.

System embodiment

According to the embodiment of the invention, also provide a kind of call control system.This system can be used for the calling-control method that realization said method embodiment provides.

Figure 13 is the block diagram according to the call control system of the embodiment of the invention, and Figure 14 is the block diagram according to the preferred structure of the call control system of the embodiment of the invention.

As shown in figure 13, comprise according to the call control system of the embodiment of the invention: core net and wireless network, wherein, core net comprises: the first sending module 10, the first sending modules 12, wireless network comprises: the first receiver module 20, adjusting module 30, particularly:

The first sending module 10, the IP link that is used for sending corresponding current calling turns the request message of TDM link, and wherein, the IP link turns the identification information that carries the TDM link in the request message of TDM link;

Preferably, the first sending module 10 is arranged at MSC Server.

The first adjusting module 12 is used for stopping using the current calling of IP link bearer, and uses the current calling of TDM link bearer;

Preferably, the first adjusting module 12 can be used for using simultaneously IP link and the current calling of TDM link bearer.

Preferably, the first adjusting module 12 is arranged at MGW.

Wherein, wireless network comprises:

The first receiver module 20 is connected to the first sending module 10, is used for receiving the request message that turns the TDM link from the IP link of the first sending module 10;

The second adjusting module 30, be connected to the first receiver module 20, the IP link that is used for 20 receptions of response the first receiver module turns the request message of TDM link, stops using the current calling of IP link bearer, and the use TDM link bearer current calling corresponding with the identification information of TDM link.

Preferably, the first receiver module 20 and the second adjusting module 30 are arranged at BSC.

Shown in Fig. 14, on the basis of structure shown in Fig. 13, also comprise according to the wireless network of the call control system of the embodiment of the invention: the second sending module 40, core net also comprises: the second receiver module 50 and release module 60, wherein:

The second sending module 40 is used for sending the response message that corresponding IP link turns the request message of TDM link.

The second receiver module 50 is connected to the second sending module 40, is used for receiving the response message from the second sending module 40;

Release module 60 is connected to the second receiver module 50, is used for the response message according to 50 receptions of the second receiver module, the IP resource of the current calling of releasing bearing.

Preferably, the second sending module 40 is arranged at BSC, and the second receiver module 50 and release module 60 are arranged at MSC Server.

In addition, the call control system according to the embodiment of the invention can also comprise:

Search the module (not shown), be arranged at MSC Server, be connected to the first sending module 10, thereby be used for searching and determining the TDM link.

Preferably, search module and be arranged at MSC Server.

The coding/decoding module (not shown) is used for the coded system of compressed voice and the coded system of pulse code modulation speech are changed mutually.

Preferably, coding/decoding module can be arranged at BSC, also can be arranged at MGW, can also be arranged at individually wireless network or core net, does not limit herein.

In specific implementation process, the system that provides according to the embodiment of the invention can finish the processing shown in Fig. 2 to Figure 12 equally, and concrete processing procedure no longer is repeated in this description herein.

In sum, by means of technique scheme of the present invention, the IP link that sends the identification information carry the TDM link to BSC by MSC Server turns the request message of TDM link, BSC is converted to TDM link bearer corresponding to this identification information with A chain of interfaces routing IP link bearer, can carry out according to demand the mutual conversion of link bearer, improve the ability that the network equipment resource is adjusted.

Obviously, those skilled in the art should be understood that, above-mentioned each module of the present invention or each step can realize with general calculation element, they can concentrate on the single calculation element, perhaps be distributed on the network that a plurality of calculation elements form, alternatively, they can be realized with the executable program code of calculation element, thereby, they can be stored in the storage device and be carried out by calculation element, perhaps they are made into respectively each integrated circuit modules, perhaps a plurality of modules in them or step are made into the single integrated circuit module and realize.Like this, the present invention is not restricted to any specific hardware and software combination.

The above is the preferred embodiments of the present invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.

Claims

1. calling-control method is used for the A interface link it is characterized in that by be converted to the link bearer based on time division multiplexing TDM based on the IP link bearer, comprising:

The IP link that mobile switching center server MSC Server sends corresponding current calling to base station controller BSC turns the request message of TDM link, and wherein, described IP link turns the identification information that carries the TDM link in the request message of TDM link;

Described BSC responds the request message that described IP link turns the TDM link, stop using the described current calling of IP link bearer, and use and described IP link turn the described current calling of TDM link bearer corresponding to identification information of the TDM link in the request message of TDM link;

Media gateway MGW uses the described current calling of described TDM link bearer, stops using the described current calling of described IP link bearer.

2. method according to claim 1 is characterized in that, sends to described BSC before described IP link turns the request message of TDM link at described MSC Server, and described method also comprises:

Thereby described MSC Server searches and determine described TDM link.

3. method according to claim 1 is characterized in that, uses and after described IP link turned the described current calling of TDM link bearer corresponding to the identification information of the TDM link in the request message of TDM link, described method also comprised at described BSC:

Described BSC sends the response message that corresponding described IP link turns the request message of TDM link to described MSC Server;

After described MSC Server received described response message, described MGW stopped using the described current calling of described IP link bearer.

4. according to claim 1 and 2 or 3 described methods, it is characterized in that, use at described A interface link in the situation of coded system of pulse code modulation speech, described BSC uses and turns the described current calling of TDM link bearer corresponding to the identification information of the TDM link in the request message of TDM link with described IP link and comprise:

Described BSC uses the coded system of described pulse code modulation speech to carry described current calling at described TDM link.

5. according to claim 1 and 2 or 3 described methods, it is characterized in that, use at described A interface link in the situation of coded system of compressed voice, described BSC uses and turns the described current calling of TDM link bearer corresponding to the identification information of the TDM link in the request message of TDM link with described IP link and comprise:

Be sent to the data of core net for wireless network, the codec unit TC of described wireless network is converted to the coded system of described compressed voice the coded system of pulse code modulation speech;

The TC of described wireless network uses described TDM link that the data of the coded system of described pulse code modulation speech are sent to described MGW.

6. according to claim 1 and 2 or 3 described methods, it is characterized in that, use at described A interface link in the situation of coded system of compressed voice, described BSC uses and turns the described current calling of TDM link bearer corresponding to the identification information of the TDM link in the request message of TDM link with described IP link and comprise:

The TC of described wireless network uses described TDM link the data of the coded system of described pulse code modulation speech to be sent to the TC of described core net;

The coded system of the pulse code modulation speech of the described data that the TC of described core net will receive is converted to the coded system of described compressed voice, and described data are sent to described MGW.

7. method according to claim 5 is characterized in that, described MGW uses the described current calling of described TDM link bearer to comprise:

Pass to the data of wireless network for core net, the TC of described core net is converted to the coded system of described compressed voice the coded system of pulse code modulation speech;

Described TC uses described TDM link that the data of the coded system of described pulse code modulation speech are sent to described BSC.

8. call control system comprises: core net and wireless network, and wherein, the A interface between described core net and the described wireless network is characterized in that based on the IP link bearer,

Described core net comprises:

The first sending module, the IP link that is used for sending corresponding current calling turns the request message of TDM link, and wherein, described IP link turns the identification information that carries the TDM link in the request message of TDM link;

The first adjusting module is used for stopping using the described current calling of IP link bearer, discharges the IP resource, and uses the described current calling of described TDM link bearer, perhaps is used for using IP link and TDM link to carry simultaneously current calling simultaneously;

Described wireless network comprises:

The first receiver module is used for receiving the request message that described IP link turns the TDM link;

The second adjusting module, turn the request message of TDM link for the described IP link that responds described the first receiver module reception, stop using the described current calling of IP link bearer, and use and described IP link turn the described current calling of TDM link bearer corresponding to identification information of the TDM link in the request message of TDM link.

9. system according to claim 8 is characterized in that,

Described wireless network also comprises:

The second sending module is used for sending the response message that corresponding described IP link turns the request message of TDM link;

Described core net also comprises:

The second receiver module is used for receiving the described response message from described the second sending module;

Release module is used for the described response message according to described the second receiver module reception, the IP resource of the described current calling of releasing bearing.

10. according to claim 8 or 9 described systems, it is characterized in that described system also comprises:

Search module, thereby be used for searching and determining described TDM link; And/or,

Coding/decoding module is used for the coded system of compressed voice and the coded system of pulse code modulation speech are changed mutually.