CN101316379B - Method, device and system for implementing IP A interface in second generation mobile communication system - Google Patents
Method, device and system for implementing IP A interface in second generation mobile communication system Download PDFInfo
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Abstract
The invention discloses a method, equipment and a system for causing an A interface to obtain the IP, which are used for realizing the IP processing to the A interface between a base-station control device and a media gateway. The method of the invention mainly includes that the base-station control device carries out the removal of the encapsulation of a rate adapter unit TRAU to received wireless side data so as to obtain the static-load data of a compressed voice code, the static-load data of a compressed voice code is then encapsulated into an IP packet; the IP packet is sent to the media gateway by the A interface between the base-station control device and the media gateway. Therefore, the method, the equipment and the system can realize the non-code conversion of the path wholly or partially so as to improve the voice quality and save the equipment cost. Simultaneously, the transmission by the compressed code can also reduce the transmission consumption and the transmission cost, and improve the transmission utilization.
Description
Technical field
The present invention relates to wireless communication technology field, relate in particular to the technology that realizes of the A interface IPization in a kind of second generation mobile communication system.
Background technology
The structure of GSM (global system for mobile communications) as shown in Figure 1, in gsm system, BTS (base station) and BSC (its station control) are referred to as base station sub-system BSS.Between BTC and BSC, interface is called Abis interface, and the interface between BSS and MSC (mobile switching centre) is called the A interface.
At present, as shown in Figure 2, Abis interface and A interface all adopt TDM (time division multiplexing) transmission technology, described Abis interface adopts TRAU (Rate Adapter Unit) protocol frame to transmit GSM voice-and-data message, each TRAU passage occupies the 16K bandwidth, and the speech coding form of employing is HR (half rate), FR (full rate) or EFR (EFR) voice coding modes; Described A interface adopts G.711 mode transferring voice and data message.
Core-network side at gsm system, the transmission means that has adopted Bearer Control to separate, under this mode: all signaling control sections are by MSC SERVER (Mobile Switching Center Server), and namely MSC is responsible for processing, and processing is responsible for by MGW (media gateway) in all bearing parts.Core net between MGW adopts the IP transmission means, improves efficiency of transmission, saves bandwidth.
In realizing process of the present invention, the inventor finds that in prior art, there are the following problems at least:
1, the BSC compressed encoding that need to complete HR, the FR of wireless side or EFR to the conversion process of G.711 non-compressed encoding, had both reduced voice quality, had wasted again TC (code interchanger) resource;
2, the A interface adopts G.711 coding, and the bandwidth that need to occupy 64Kbps is called out on every road, causes BSS (base station sub-system) to the waste of the transfer resource of core net.
Summary of the invention
Embodiments of the invention provide method, the equipment and system of realizing A interface IPization in a kind of second generation mobile communication system, with the quality of voice transfer in second Generation Mobile Communication Systems such as raising gsm system, and can save the TC resource.
The embodiment of the present invention provides a kind of method that realizes A interface IPization in second generation cordless communication network, is used for realizing the IPization processing of the A interface between base station control device and media gateway, comprising:
Base station control device is removed Rate Adapter Unit TRAU encapsulation to the wireless side data that receive, and obtains the quiet lotus data of compressed voice coding;
Described compressed voice is encoded quiet lotus data encapsulation in the IP bag, and pass to described media gateway by the A interface between base station control device and media gateway.
The embodiment of the present invention provides the system that realizes A interface IPization in a kind of second generation cordless communication network, is used for realizing the IPization processing of the A interface between base station control device and media gateway, comprising:
Base station control device is used for the wireless side data that receive are removed Rate Adapter Unit TRAU encapsulation, obtains the quiet lotus of compressed voice coding, and sends after the quiet lotus data encapsulation of compressed voice coding is in the IP bag described;
Media gateway is used for obtaining by the A interface between base station control device and media gateway the quiet lotus data of compressed voice coding that are packaged in the IP bag that base station control device sends, and continues transmission.
The embodiment of the present invention provides a kind of base station control device, comprising:
The TRAU termination unit is used for the wireless side data that receive are removed Rate Adapter Unit TRAU encapsulation, the quiet lotus data of compressed voice coding of acquisition;
The data encapsulation unit is used for that the TRAU termination unit is processed the quiet lotus data encapsulation of compressed voice coding that obtains and wraps in IP;
The first data transmission unit is used for the described IP bag after described data encapsulation unit package is sent to media gateway.
The embodiment of the present invention provides a kind of media gateway, comprising:
The data receiver unit is used for receiving by the next IP bag of A interface transmission, and described IP bag is carrying through removing the quiet lotus data of compressed voice coding after TRAU encapsulates;
Conversion processing unit is carried in the IP bag after being used for the compression coding mode of the quiet lotus data of compressed voice coding of described IP bag and/or packaged type are converted to compression coding mode that receiving terminal adopts and/or packaged type;
The second data transmission unit is used for sending the IP bag after described transcoder unit conversion process.
Can be found out by the technical scheme that the embodiment of the invention described above provides, the conversion that it can avoid wireless side in the wireless communication systems such as GSM and core net to carry out encoding and decoding, thereby can realize the TRFO (Transcoder Free Operation) in complete trails or part path, to improve voice quality, save equipment cost.Further, can also reduce transmission and consume, improve transmission utilization ratio, reduce transmission cost.
Description of drawings
Fig. 1 is the structural representation of gsm system in prior art;
Fig. 2 is the A interface transmitting procedure schematic diagram in gsm system in prior art;
Networking structure schematic diagram after the A interface IPization that Fig. 3 provides for the embodiment of the present invention;
Fig. 4 is the specific implementation structural representation of the embodiment of the present invention;
Fig. 5 is A interface user plane protocol stack schematic diagram in the embodiment of the present invention;
Fig. 6 is that 2G in the embodiment of the present invention is to the calling procedure schematic diagram of 2G;
Fig. 7 is Nb interface user face protocol stack schematic diagram one in the embodiment of the present invention;
Fig. 8 is 2G in the embodiment of the present invention and the networking schematic diagram of 3G intercommunication;
Fig. 9 is Nb interface user face protocol stack schematic diagram two in the embodiment of the present invention;
Figure 10 is Nb interface user face protocol stack schematic diagram three in the embodiment of the present invention;
Figure 11 is the Apparatus and system structural representation in the embodiment of the present invention.
Embodiment
In the embodiment of the present invention, after A interface IPization, networking structure as shown in Figure 3, adopts the IP transmission technology at the A interface, and no longer adopts the TDM transmission technology.
In the invention process, provide the technical scheme that realizes A interface IPization in second generation cordless communication network, to realize the IPization processing of the A interface between base station control device and media gateway.Be specifically as follows: at first at base station control devices such as BSC (base station controller), the wireless side data that receive are removed the processing (being the TRAU finalization process) of Rate Adapter Unit TRAU encapsulation, obtained through the quiet lotus data of compressed voice coding; Afterwards, encode quiet lotus data encapsulation with described in the IP bag through compressed voice, and pass to described media gateway by the A interface between base station control device and media gateway, to proceed the business transmission process by described media gateway.
In the implementation procedure of above-mentioned removal TRAU encapsulation, specifically can obtain according to specific bit position wherein the compressed voice coded system of present frame; Afterwards, just can data be processed accordingly according to the coded system of determining, for example, to the FR coded system, the FR voice of 20ms are just in time 260 Bit, and D1-D260 is exactly the final quiet lotus data of compressed voice coding; To the EFR coded system, the non-EFR vocoded data that need to will be in 260Bit be used for CRC check is removed, obtaining 244Bit data corresponding to final 20msEFR voice, etc.
In the embodiment of the present invention, media gateway receive described wrap by IP send through the quiet lotus data of compressed voice coding (the quiet lotus data after being compressed encoding) after, can also carry out at least a in following two kinds of processing:
(1) judge whether the compression coding mode of the quiet lotus the data of described compressed voice coding is identical with the compression coding mode of the distolateral employing of reception of these data;
(2) judge whether the packaged type of the quiet lotus the data of described compressed voice coding is identical with the packaged type of the distolateral employing of reception of these data;
In above-mentioned judgement processing procedure, if judged result is identical, directly described data are sent to the distolateral media gateway of reception of these data, otherwise, the different at least one item that is judged as in the compression coding mode of described data and packaged type is converted to send to after the compression coding mode that receives distolateral employing and/or packaged type and receives distolateral media gateway.
Determine the compression coding mode of the quiet lotus the data of process compressed voice coding for making media gateway to identify, corresponding processing procedure can for: the compression coding mode through the quiet lotus the data of compressed voice coding that at first will be received by base station control device sends Mobile Switching Center Server to, by Mobile Switching Center Server, the compression coding mode of described the data is sent to media gateway afterwards, thereby make media gateway know corresponding compression coding mode.
Moreover, can know the beared information of receive data for making media gateway and base station control device, can also the beared information of the data that sends be sent to Mobile Switching Center Server by base station control device, then by Mobile Switching Center Server, described beared information be sent to media gateway; And, can send to Mobile Switching Center Server by the beared information that media gateway will send the data, and by Mobile Switching Center Server, described beared information be sent to base station control device.
The business transmitting procedure that the embodiment of the present invention provides is included in the business transmitting procedure in second generation mobile communication system, and the business transmitting procedure between second generation mobile communication system and 3-G (Generation Three mobile communication system), and the below will describe respectively:
In second generation mobile communication system, do not adopt the user plane packaged type to carry out the transmission of business between the media gateway of the media gateway of calling subscriber's side and called subscriber's side, namely do not carry out the user plane encapsulation operation on media gateway;
In second generation mobile communication system and 3-G (Generation Three mobile communication system), if adopt the single-rate coding between the media gateway of the media gateway of calling subscriber's side and called subscriber's side, do not adopt the user plane packaged type to carry out the transmission of business between two media gateway, namely do not carry out the user plane encapsulation operation on media gateway, if employing multi-rate coding, adopt the user plane packaged type to carry out the transmission of business, namely need to carry out corresponding user plane encapsulation operation on media gateway.
In above-mentioned processing procedure, adopt RTP (RTP) packaged type to carry out the transmission of business between described base station control device and media gateway.
For ease of the understanding to the embodiment of the present invention, be elaborated below in conjunction with the specific implementation of accompanying drawing to the embodiment of the present invention.
(time division multiplexing) interface is example take the Abis mouth as TDM, on BSC, only completes the conversion that TDM is carried to the IP carrying, realizes the termination of TRAU, namely realizes removing the TRAU encapsulation process, and does not carry out code conversion.Be namely data after the GSM compressed encoding at BSC to what transmit between MGW, corresponding compression coding mode can be encoded for HR, FR coding, EFR coding or AMR (adaptation rate) coding etc.
As shown in Figure 3, in BSC, send to MGW after the quiet lotus of GSM compressed encoding voice is encapsulated as RTP (RTP) message, and need not to keep again in BSC TC is set.
The specific implementation of the embodiment of the present invention as shown in Figure 4, wherein, TRAU ends in BSC, adopts IP-based packaged type to carry out the encapsulation transmission of business to be transmitted between BSC and MGW, for example, described business to be transmitted (as speech business after compressed encoding etc.) is packaged in the IP message, perhaps, be packaged in IP-based UDP (User Datagram Protoco (UDP)) message, perhaps, be packaged in IP-based RTP message, etc.; Corresponding TC no longer is arranged in BSC, and selects to be arranged in MGW.
Like this, if the Codec (codec) that calling subscriber's side and called subscriber's side adopt is consistent, can realize the TRFO (Transcoder Free Operation) of whole transmitting procedure, realize that namely whole talk path exempts from TC; If the Codec that calling subscriber and called subscriber's side adopt is inconsistent, only need to insert TC on the MGW of a side, get final product to carry out corresponding encoding and decoding conversion processing, for example, insert TC on the MGW of called subscriber's side, if find that the Codec of calling subscriber's side and called subscriber's side is inconsistent, carry out the conversion process of corresponding compression coding mode by corresponding TC, to guarantee the proper communication between calling subscriber and called subscriber.
Come transmitting voice service because the user's face A interface between BSC and MGW adopts compression coding mode, and the IP transmission statistic multiplexing can be realized, therefore, transmission bandwidth can be effectively saved.
And, owing to no longer calling out for every road, corresponding TC is set, make when the active and standby coding that is side is consistent, can realize TRFO, thus the raising voice quality.
In embodiments of the present invention, for realizing that TRAU ends in BSC, TC ends in MGW, also provide the detailed implementation of A interface, Nb interface, Mc interface, the below will describe one by one.
(1) A interface voice protocol stack
No matter Abis interface is based on IP or TDM, TRAU in BSC all can unify the voice message encapsulation form as shown in Figure 5 with Abis interface, namely not with the RTP encapsulation format of UP (user plane), be followed successively by by lower floor to upper strata: MAC (media access control) or PPP (point-to-point protocol) protocol layer, IP layer, UDP layer, RTP layer and Payload (carrying) layer, wherein
For FE (Fast Ethernet) or GE (gigabit Ethernet) interface, corresponding bottom is the MAC layer; For POS (PPP OVER SDH is based on the point-to-point protocol of Synchronous Digital Hierarchy) and IPOVER E1 (based on the IP of E1) interface, corresponding bottom is the PPP layer;
The Payload layer of the corresponding the superiors, for EFR, FR or HR coded system, what carry is the quiet lotus of voice message, its concrete syllable sequence encapsulation format can adopt the packaged type in ETSI ts_101318 (ETSI, European Telecommunications Sdandards Institute is called for short ETSI) standard definition; For the AMR coded system, because it is parameter rate speech coding, has voice rate adjustment process in band, therefore corresponding Payload layer adopts IETF RFC3267 (IETFRFC, The Internet Engineering Task Force Request ForComments, namely engineering duty group in Internet require to be explained) packaged type that defines in standard.
In the embodiment of the present invention, in order to be consistent with TRAU, the packing time unification that speech business specifically can be set is 20ms.
Take gsm system as example, its coded system commonly used comprises EFR, FR, HR or AMR, etc.Wherein, the Clock rate (clock rate) of EFR and FR is 8000Hz, and the PT of FR (bearer types, Payload Type) is 3 of static state, and the PT of EFR is dynamic (96-127).
Under the FR coded system, owing to adopting static PT, therefore respective handling is fairly simple.
Under the EFR coded system, namely for the PT of the EFR of A interface coding, need to expand BSSAP (Base Station System Application Part) signaling, by consulting the PT of the EFR between BSC and MGW between MSC Server and BSC; Perhaps, by pre-configured corresponding PT on MSC Server, be handed down to BSC and MGW by BSSAP message and Mc message afterwards; Perhaps, also can determine corresponding PT (span is 96-127) by configuration on BSC and MGW, and both sides are consistent and get final product.
For other coded systems such as HR, can contrast above-mentioned PT and determine that mode realizes, for example, be consistent with EFR, adopt dynamic PT, therefore not explanation one by one.
The definition of each PT value that different coding mode and data service are corresponding is specifically as follows following each value:
FR：3；
EFR：96-127；
HR：96-127；
AMR：96-127；
DATA (data service): 96-127;
RED (redundancy): 96-127;
Wherein, EFR, HR, AMR or data service, its data redundancy is dynamic PT, and concrete value is by unified MGW and the BSC of being handed down to of MSC Server.
Corresponding PTIME (packing time): 20ms.
DTX (discontinuous transmission): BSS and MGW need to support.
(2) realization of Mc interface
MSC Server provides the beared information of A interface to MGW by Mc interface.
Be specifically as follows: BSC by expansion BSSMAP message with self as IP address, port numbers equivalent-load information reporting to MSC Server, and by the beared information of MSC Server with described BSC, and the result of codec negotiation, be handed down to MGW; Simultaneously, MSC Server also receives the beared information of the MGW that MGW sends, and the beared information of MGW is handed down to BSC.
For the different coding mode, the SDP of the beared information that MSC Server issues (Session Description Protocol) message is defined as follows:
(1) FR coding
c＝IN?IP410.10.10.1；
m＝audio49120RTP/AVP3；
a＝ptime：20；
Wherein, c refers to link information (conne ction information), and m refers to media name and transport address (media name and transport address), and a=ptime refers to the packing time (packet time).
(2) EFR coding
c＝IN?IP410.10.10.1；
m＝audio49120RTP/AVP98；
a＝rtpmap：98GSM-EFR/8000；
a＝ptime：20；
Wherein, a=rtpmap refers to medium property (media attribute lines), i.e. the coding name.
(3) HR coding
c＝IN?IP410.10.10.1；
m＝audio49120RTP/AVP98；
a＝rtpmap：98GSM-HR/8000；
a＝ptime：20；
(4) AMR coding
Detailed definition is arranged in RFC3267.
c＝IN?IP410.10.10.1；
m＝audio49120RTP/AVP97；
a＝rtpmap：97AMR/8000/1；
a＝fmtp：97mode-set＝0，2，5，7；
a＝maxptime：20；
(5) data service
c＝IN?IP410.10.10.1；
m＝DATA49120RTP/AVP97；
SERVER guarantees above various PT, and is different.
(3) realization of Nb interface
Nb interface is to adopt IPBCP (IP Bearer Control Protocol) to consult corresponding PT.
In order to realize TRFO, the processing of adopting at Nb interface is consistent with the A interface as far as possible, wherein: for the calling of 2G to 2G, no matter be single-rate coding or multi-rate coding, all adopt the packaged type without UP; For the calling of 2G to 3G, if the odd number rate is encoded, adopt the packaged type consistent with the A interface, if 2G and 3G all adopt the AMR coding, adopt the packaged type with UP.
(1) calling procedure in single-rate encoding and decoding situation
For 2G to the calling of 2G, the process that corresponding interoffice and intra-office are called out as shown in Figure 6, in Fig. 6, BSC1 is office call to the calling of BSC2, BSC1 is station to station call to BSC3.No matter be interoffice or office call, all do not adopt the UP packaged type for single-rate encoding and decoding (HR/FR/EFR), and directly adopt the RTP message directly to encapsulate the mode of voice message.
Accordingly, single-rate is encoded quiet lotus packaged type as shown in Figure 7, and be followed successively by by lower floor to upper strata: MAC or ppp protocol layer, IP layer, UDP layer, RTP layer and Payload layer, wherein, the Payload layer is specifically as follows the data under HR, FR or EFR coded system.
(2) multi-speed encoding/decoding situation
For the networking structure of the calling of 2G and 3G intercommunication as shown in Figure 8, wherein, also comprise the calling of BSC1 to the 2G between BSC2 to 2G, when adopting the AMR encoding and decoding, corresponding encapsulation format adopts the packaged type of RFC3267 standard code as shown in Figure 9, and does not adopt the UP encapsulation format.
For the calling of 2G to 3G, be between the BSC1 and RNC1 in Fig. 8, and the calling between RNC2 and BSC2 is from the calling between 2G and 3G, adopting in AMR encoding and decoding situation, corresponding UP packaged type as shown in figure 10, different from Fig. 9 is that the AMR Payload in Figure 10 is the quiet lotus of AMR.Wherein, when the user in 2G is caller, the UP direction of the Nb interface of close 2G side is CN/Outgoing (core net outgoing direction), and when the user in 2G was called, the UP direction of the Nb interface of close 2G side was CN/lncoming (core net Inbound); Be the MGW of 2G side need to complete AMR not with UP packaged type (A interface) to the conversion of AMR with the UP packaged type.
After A interface IPization, if the interoffice Nb interface adopts the AMR mode with UP, adopt the beared information of IPBCP negotiation Nb interface as follows at Nb interface:
c＝IN?IP4192.168.153.21；
m＝audio764RTP/AVP96；
a＝ptime：20；
a＝rtpmap：96VND.3GPP.IUFP/16000；
After A interface IPization, if when Nb interface does not adopt AMR mode with UP, according to the difference of coded system and data service type, respectively can but be not limited to IPBCP is consulted to do following expansion:
(1) for the calling of 2G to 2G, if the interoffice Nb interface adopts not with the AMR under the RFC3267 mode of UP, the beared information that IPBCP consults is:
c＝IN?IP4192.168.153.21；
m＝audio764RTP/AVP96；
a＝ptime：20；
a＝rtpmap：96AMR/8000/1；
(2) if interoffice adopts the FR coding, its PT is static PT, and the beared information that IPBCP consults is:
c＝IN?IP4192.168.153.21；
m＝audio764RTP/AVP3；
a＝ptime：20；
(3) if interoffice adopts the EFR coding, be dynamic PT, the beared information that IPBCP consults is:
c＝IN?IP4192.168.153.21；
m＝audio764RTP/AVP97；
a＝ptime：20；
a＝rtpmap：96GSM-EFR/8000；
(4) if interoffice adopts the HR coding, be dynamic PT, the beared information that IPBCP consults is:
c＝IN?IP4192.168.153.21；
m＝audio764RTP/AVP97；
a＝ptime：20；
a＝rtpmap：96GSM-HR/8000；
(5) for the 5ms of the interoffice data service with UP, the beared information that IPBCP consults is:
c＝IN?IP4192.168.153.21；
m＝audio764RTP/AVP96；
a＝ptime：5；
a＝rtpmap：96VND.3GPP.IUFP/16000；
(6) for the data service G.711 of interoffice 20ms, the beared information that IPBCP consults is:
c＝IN?IP4192.168.153.21；
m＝audio764RTP/AVP0；
a＝ptime：20；
Perhaps:
c＝IN?IP4192.168.153.21；
m＝audio764RTP/AVP8；
a＝ptime：20。
Need to prove, IP address and port number information concrete in above SDP information are only concrete example, can change accordingly according to actual conditions in actual application.The load type PT information of RTP is if the dynamic PT between 96～127 can change according to actual conditions too.
In the embodiment of the present invention, Nb interface data encapsulation form is specifically as follows: for by the data service of 2G to 2G, adopt the 20ms packing, and adopt the mode of RFC2198 standard to carry out redundancy; For by the data service of 2G to 3G, adopt 5ms G.711 with the packaged type of UP.
The embodiment of the present invention also provides a kind of system of A interface IPization, to be used for realizing the IPization processing of the A interface between base station control device and media gateway, its specific implementation structure specifically can comprise base station control device and media gateway as shown in figure 11, wherein:
(1) base station control device, as BSC etc., be used for the wireless side data that receive are removed the processing that Rate Adapter Unit TRAU encapsulates, obtain through the quiet lotus data of compressed voice coding, encode quiet lotus data encapsulation with described in the IP bag through compressed voice; Described base station control device can also be used for and will send to Mobile Switching Center Server at compression coding mode and/or the beared information that user's face sends the data, and by Mobile Switching Center Server, compression coding mode and/or the beared information of described data is sent to media gateway; Simultaneously, the compression coding mode and/or the beared information that can also the receiving media gateway send by Mobile Switching Center Server of base station control device.
With reference to shown in Figure 11, this base station control device specifically can comprise following processing unit:
(1) TRAU termination unit is used for the wireless side data that receive are removed the processing of Rate Adapter Unit TRAU encapsulation, obtains through the quiet lotus data of compressed voice coding;
(2) data encapsulation unit, be used for to described TRAU termination unit process obtain through the quiet lotus data encapsulation of compressed voice coding in the IP bag, and continue to pass to the first data transmission unit;
(3) first data transmission unit is used for described IP bag after described data encapsulation unit package is sent to media gateway.
Alternatively, this base station control device also comprises at least one in compression coding mode transmitting element, the first beared information receiving element and the first beared information transmitting element, wherein,
The compression coding mode transmitting element, the compression coding mode that is used for the data that will send at user's face sends to Mobile Switching Center Server;
The first beared information receiving element, the beared information of the data that the media gateway that sends by Mobile Switching Center Server for the receiving media gateway sends;
The first beared information transmitting element is used for and will sends to Mobile Switching Center Server at the beared information of user's face transmission the data.
(2) media gateway as MGW etc., is used for obtaining the IP bag by the A interface between base station control device and media gateway, and continues the described IP bag of transmission, is carrying the quiet lotus data of compressed voice coding through the processing of removing the TRAU encapsulation in described IP bag, described media gateway can also be communicated by letter with Mobile Switching Center Server, so that obtain from described Mobile Switching Center Server the compression coding mode information that it receives from base station control device, so that know corresponding compression coding mode, and, the beared information that this locality is sent the data sends to Mobile Switching Center Server, so that by Mobile Switching Center Server, described beared information is sent to base station control device, soon media gateway is called out the beared information that distributes for this reason and is reported Mobile Switching Center Server on the wireless side end points, be handed down to base station control device by Mobile Switching Center Server again, so that after media gateway and base station control device all can obtain the beared information of opposite end, realize the carrying foundation between base station control device and media gateway,
With reference to shown in Figure 11, this media gateway specifically can comprise following processing unit:
(1) data receiver unit is used for receiving the quiet lotus data of compressed voice coding that are carried on the IP bag of coming by the transmission of A interface;
(2) conversion processing unit, be carried in the IP bag after being used for the compression coding mode of the data of described IP bag and/or packaged type are converted to the compression coding mode that receives distolateral employing and/or packaged type, namely carry out corresponding conversion process between the both sides of media gateway;
(3) second data transmission units are used for the bag of the IP after described transcoder unit conversion process is sent to the media gateway at the receiving terminal place of these data.
Alternatively, described media gateway can also comprise the judgement processing unit, whether compression coding mode and/or packaged type for the data that judges described IP bag be identical with compression coding mode and/or the packaged type of the distolateral employing of reception of these data, if identical, directly send described IP bag to data transmission unit, otherwise, send described IP bag to conversion processing unit; Be that media gateway can be selected the compression coding mode of corresponding data employing and at least one item in packaged type are judged between its both sides, so that carry out corresponding conversion process according to judged result;
Alternatively, described media gateway can also comprise at least one in compression coding mode receiving element, the second beared information transmitting element and the second beared information receiving element, wherein,
The compression coding mode receiving element be used for to receive the compression coding mode of the data that base station control device that Mobile Switching Center Server sends sends at user plane, and offers described compression coding mode determining unit;
The second beared information transmitting element sends to Mobile Switching Center Server for the beared information that media gateway is sent the data, so that by described Mobile Switching Center Server, described beared information is sent base station control device;
The second beared information receiving element be used for to receive the beared information of the data that base station control device that Mobile Switching Center Server sends sends at user plane, and offers described data transmission unit.
Alternatively, described media gateway can also also comprise the beared information negotiation element, be used for and the opposite end media gateway between the beared information that adopts of negotiation data transmitting procedure.
In sum, in the embodiment of the present invention, after A interface IPization, moving on on TC in MGW of employing with the implementation of TRAU in the BSC termination, simultaneously, gives the specific implementation of A interface, Mc interface, Nb interface.Therefore, the realization of the embodiment of the present invention can avoid wireless side and the core net in gsm system to carry out the conversion of encoding and decoding, thereby has realized the TRFO in complete trails or part path, to improve voice quality, saves equipment cost; Further, can also reduce transmission and consume, improve transmission utilization ratio, reduce transmission cost.
The above; only for the better embodiment of the present invention, but protection scope of the present invention is not limited to this, anyly is familiar with those skilled in the art in the technical scope that the present invention discloses; the variation that can expect easily or replacement are within all should being encompassed in protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of claim.
Claims (10)
1. realize the method for A interface IPization in a second generation cordless communication network, the method is used for realizing the IPization processing of the A interface between second generation base stations in wireless communication networks control appliance and media gateway, it is characterized in that, comprising:
Base station control device is removed Rate Adapter Unit TRAU encapsulation to the wireless side data that receive, and obtains the quiet lotus data of compressed voice coding;
Described compressed voice is encoded quiet lotus data encapsulation in the IP bag, and pass to described media gateway by the A interface between base station control device and media gateway;
described media gateway is determined compression coding mode and/or the packaged type of the quiet lotus the data of compressed voice coding, and judge this compression coding mode and/or packaged type, whether identical with compression coding mode and/or the packaged type of the distolateral employing of reception of the quiet lotus data of this compressed voice coding, if identical, directly described data are sent to the distolateral media gateway of reception of these data, otherwise, the compression coding mode of described data and/or packaged type are converted to send to after the compression coding mode that receives distolateral employing and/or packaged type receive distolateral media gateway,
Wherein, described method also comprises:
In second generation mobile communication system, do not adopt the user plane packaged type to carry out the transmission of business between the media gateway of the media gateway of calling subscriber's side and called subscriber's side;
In second generation mobile communication system and 3-G (Generation Three mobile communication system), if adopt the single-rate coding between the media gateway of the media gateway of calling subscriber's side and called subscriber's side, do not adopt the user plane packaged type to carry out the transmission of business, if the employing multi-rate coding adopts the user plane packaged type to carry out the transmission of business.
2. method according to claim 1, is characterized in that, described media gateway is determined to comprise through the step of the compression coding mode of the quiet lotus the data of compressed voice coding:
Base station control device sends the compression coding mode of the quiet lotus the data of the compressed voice received coding to Mobile Switching Center Server, and by Mobile Switching Center Server, the compression coding mode of described the data is sent to media gateway.
3. according to claim 2 the method for stating, is characterized in that, described base station control device also sends to Mobile Switching Center Server with the beared information of data, and by Mobile Switching Center Server, the beared information of described data is sent to media gateway; And/or described base station control device also receives the beared information of the data that media gateway that Mobile Switching Center Server sends sends to mobile switching centre.
4. method according to claim 1, is characterized in that, adopts the realtime transmission protocol RTP packaged type to carry out the transmission of business between base station control device and media gateway.
5. realize the system of A interface IPization in a second generation cordless communication network, be used for realizing the IPization processing of the A interface between second generation base stations in wireless communication networks control appliance and media gateway, it is characterized in that, comprising:
Base station control device is used for the wireless side data that receive are removed Rate Adapter Unit TRAU encapsulation, obtains the quiet lotus data of compressed voice coding, and sends after the quiet lotus data encapsulation of compressed voice coding is in the IP bag described;
Media gateway is used for obtaining by the A interface between base station control device and media gateway the quiet lotus data of compressed voice coding that are packaged in the IP bag that base station control device sends, and continues transmission;
Described media gateway specifically comprises:
Whether the judgement processing unit is used for judging compression coding mode and/or the packaged type of described data, identical with the compression coding mode of the distolateral employing of reception of these data, if identical, directly send described IP bag to data transmission unit, otherwise, send described IP bag to transcoder unit;
Data transmission unit is used for described IP bag is sent to the media gateway at the receiving terminal place of these data;
Conversion processing unit is used for the compression coding mode of the data of described IP bag and/or packaged type are converted to be carried in the IP bag after compression coding mode that receiving terminal adopts and/or packaged type sending described data transmission unit to;
Wherein, in second generation mobile communication system, do not adopt the user plane packaged type to carry out the transmission of business between the media gateway of the media gateway of calling subscriber's side and called subscriber's side;
In second generation mobile communication system and 3-G (Generation Three mobile communication system), if adopt the single-rate coding between the media gateway of the media gateway of calling subscriber's side and called subscriber's side, do not adopt the user plane packaged type to carry out the transmission of business, if the employing multi-rate coding adopts the user plane packaged type to carry out the transmission of business.
6. system according to claim 5, it is characterized in that, described media gateway also is connected with Mobile Switching Center Server, and described Mobile Switching Center Server be used for to receive that base station control device sends its send to media gateway after the compression coding mode of the data that user's face sends.
7. according to claim 5 the system that states, it is characterized in that, described base station control device also comprises the beared information transmitting element, be used for and send to Mobile Switching Center Server at the beared information that user's face sends the data, by described Mobile Switching Center Server, the beared information of described data is sent to media gateway.
8. a media gateway, is characterized in that, described media gateway is used for realizing the IPization processing of the A interface between second generation cordless communication network and base station control device, comprising:
The data receiver unit is used for receiving by the next IP bag of the transmission of the A interface between described second generation base stations in wireless communication networks control appliance and media gateway, and described IP bag is carrying through removing the quiet lotus data of compressed voice coding after TRAU encapsulates;
Conversion processing unit is carried in the IP bag after being used for the compression coding mode of the quiet lotus data of compressed voice coding of described IP bag and/or packaged type are converted to compression coding mode that receiving terminal adopts and/or packaged type;
The second data transmission unit is used for sending the IP bag after described transcoder unit conversion process;
Described media gateway also comprises:
The judgement processing unit, compression coding mode and/or packaged type for the quiet lotus the data of compressed voice coding that judges described IP bag, whether identical with compression coding mode and/or the packaged type of the distolateral employing of reception of these data, if identical, directly send described IP bag to data transmission unit, otherwise, send described IP bag to conversion processing unit;
Wherein, in second generation mobile communication system, do not adopt the user plane packaged type to carry out the transmission of business between the media gateway of the media gateway of calling subscriber's side and called subscriber's side;
In second generation mobile communication system and 3-G (Generation Three mobile communication system), if adopt the single-rate coding between the media gateway of the media gateway of calling subscriber's side and called subscriber's side, do not adopt the user plane packaged type to carry out the transmission of business, if the employing multi-rate coding adopts the user plane packaged type to carry out the transmission of business.
9. media gateway according to claim 8, is characterized in that, this media gateway also comprises at least one in compression coding mode receiving element, the second beared information receiving element and the second beared information transmitting element, wherein,
The compression coding mode receiving element be used for to receive the compression coding mode of the data that base station control device that Mobile Switching Center Server sends sends at user plane, and offers described compression coding mode determining unit;
The second beared information receiving element be used for to receive the beared information of the data that base station control device that Mobile Switching Center Server sends sends at user plane, and offers described data transmission unit;
The second beared information transmitting element is used for the beared information that local data transfer adopts is sent to Mobile Switching Center Server.
10. according to claim 8 or 9 described media gateway, is characterized in that, also comprises the beared information negotiation element, be used for and the opposite end media gateway between the beared information that adopts of negotiation data transmitting procedure.
Priority Applications (7)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200710105889XA CN101316379B (en) | 2007-06-01 | 2007-06-01 | Method, device and system for implementing IP A interface in second generation mobile communication system |
| PCT/CN2008/070249 WO2008098501A1 (en) | 2007-02-02 | 2008-02-02 | Gsm bearing set up method, apparatus and system |
| RU2009132931/08A RU2431239C2 (en) | 2007-02-02 | 2008-02-02 | Method, apparatus and system for carrier channel setup in gsm network |
| EP18207930.1A EP3512226B1 (en) | 2007-02-02 | 2008-02-02 | Method, device and system for establishing a bearer for a gsm network |
| EP08706625.4A EP2107818B1 (en) | 2007-02-02 | 2008-02-02 | Gsm bearer set up method, apparatus and system |
| US12/533,583 US8401029B2 (en) | 2007-02-02 | 2009-07-31 | Method, device and system for establishing a bearer for a GSM network |
| US13/777,618 US20130176944A1 (en) | 2007-02-02 | 2013-02-26 | Method, device and system for establishing a bearer for a gsm network |
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| CN200710105889XA CN101316379B (en) | 2007-06-01 | 2007-06-01 | Method, device and system for implementing IP A interface in second generation mobile communication system |
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