CN101360286A - Voice frame transmission system and method - Google Patents
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- CN101360286A CN101360286A CN 200710129892 CN200710129892A CN101360286A CN 101360286 A CN101360286 A CN 101360286A CN 200710129892 CN200710129892 CN 200710129892 CN 200710129892 A CN200710129892 A CN 200710129892A CN 101360286 A CN101360286 A CN 101360286A
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Abstract
The invention provides a voice frame transmission system and a method, wherein, the system consists of an MGW and a BSC. An interface A based on IP transmission (AoIP) is arranged between the MGW and the BSC; wherein, a gateway consists of a code conversion and a speed adaptation module; the BSC consists of the speed adaptation module; wherein, the gateway also includes a voice frame transmission control module which is used for judging whether the current voice frame can be sent to the AoIP interface according to the incontinuous transmission DTX control parameter sent by the code conversion and speed adaptation module, so as to send the voice frame to the BSC through the AoIP interface; the BSC also includes a voice frame detecting module which is used for detecting and renewing the voice frames sent by the MGW through the IP network. Without affecting the voice quality, the invention greatly reduces the occupation of transmission bandwidth.
Description
Technical field
The present invention relates to the mobile communication technology field, particularly a kind of voice frame transmission system and method.
Background technology
(Global System For Mobile Communication GSM) is most popular a kind of communication standard in the mobile communication to global mobile communication.The Radio Access Network of gsm system be commonly referred to base station sub-system (Base Station Subsystem, BSS).On the one hand, base station sub-system is joined with travelling carriage by wave point, carries out wireless signal transmission, reception and RRM; On the other hand, (Core Network CN) links to each other, and realizes the connection between the different user for base station sub-system BSS and core net.
In a typical gsm system, base station sub-system BSS comprise base station controller (Base StationControler, BSC) and base transceiver station (Base Transceiver Station, BTS); (CoreNetwork CN) comprises that (Mobile Switching Center, MSC) (Media Gateway MGW) waits network element for server (Server) and gateway in mobile switching centre to core net.BSS uses the speech coding of different transmission rates to transmit in order to adapt to wireless and wired system, so between BSC and CN, increased transcoder and corresponding multiplexing equipment, be code conversion and Rate Adapter Unit (Transcoder/RateAdaptor Unit, TRAU).Existing time division multiplexing (Time Division Multiplexing, TDM) in the network, TRAU usually puts together with BSC, TRAU is used to the mutual conversion finishing the compressed voice coding and G.711 encode.So the transmission of the A interface between MSC and the BSC is pulse code modulation (Pulse Code Modulation, the PCM) code stream of 64kbps.Interface definition between BSC and the BTS is an Abis interface, and what Abis interface user face transmitted is trau frame.In general, transmit a trau frame, comprise 320 bits or 160 Bit datas, be respectively applied for full speed channel and half-rate channel every 20ms.Trau frame can be divided into speech frame, Operation and Maintenance frame, Frame and empty frame again by business or function in addition, wherein speech frame comprises full rate (Full Rate, FR), enhanced full rate business (Enhanced Full Rate, EFR), half rate traffic (Half Rate, HR), adaptive multi-rate coding (Adaptive Multi-Rate, AMR) etc.
Wherein, voice transfer has dual mode, and a kind of is that no matter whether the user is talking voice flow is encoded continuously and transmitted.Another kind be discontinuous transmission (Discontinuous Transmission, DTX).Under the DTX mode, carry out speech coding and transmission in the voice activation phase; Only transmit the characterisitic parameter of comfort noise at the non-active period of speech, and carry out slow coding.Adopt the DTX mode can reduce aerial total interference level, improve system effectiveness, also can reduce power consumption, the especially travelling carriage of radio receiving-transmitting unit simultaneously.So under the DTX mode, for the professional trau frame of FR/EFR/HR have quiet indication (SilenceDescriptor, SID) frame and speech business (Speech) frame is two kinds, below, Speech frame and SID frame are referred to as speech frame.Up direction BTS by bad frame indication (Bad Frame Indication, BFI), the time unifying sign (Time Alignment Flag, TAF), the frame type of three parameters notices of SID TRAU transmission; Down direction TRAU can export a speech frame indication, and (Speech Indicator, SP) bit is used to indicate frame type.The DTX handling process of FR, EFR and HR business sees also 3GPP TS 46.031,3GPP TS 46.081 and 3GPP TS 46.041.
Existing GSM network is based on Circuit-switched, and what the A interface transmitted is the pcm stream of 64kbps.Under the TDM mode, descending SID frame is issued to BTS continuously, but BTS only constantly just can be handed down to terminal to the up-to-date SID frame of receiving at TAF, and the SID frame that will arrive is At All Other Times lost.
Along with the all-IP epoch arrive, professional IPization driving network is to IPization transition.Original network based on the TDM exchange no longer adapts to existing business demand, and the future development prospect is limited.IP more and more comes into one's own as the technology of a kind of big bandwidth, easily acquisition, high efficiency, low cost, representative future thrust.The IPization of BSS equally also can increase the GSM network advantages, as improving voice quality, save transmission cost, share bearing resource, being easy to management maintenance etc.Based on the A interface of IP transmission (A over IP, AoIP), as shown in Figure 1.
Under the AoIP mode, Abis interface may have two types: traditional Abis interface based on TDM (hereinafter referred to as the TDM Abis interface) and the Abis interface of IPization (hereinafter referred to as IP Abis).The speech frame of this interface bearing of two types is normally different.
(Transcoder TC) moves on to MGW on to coding and decoding converter under the AoIP pattern, so correspondingly, if will insert a TC in the call establishment in MGW, then TC will produce trau frame.Trau frame will be issued on the AoIP, perhaps be encapsulated as the quiet lotus of voice-bearer of other type and the frame structure of quiet parameter (as the defined frame structure of RFC3551) is issued to AoIP.If still continue to use existing TDM pattern load mode at present this moment, promptly transmit all SID frames during at silent mode at down direction, will cause a large amount of bandwidth to be wasted.
Summary of the invention
The objective of the invention is to, a kind of voice frame transmission system is provided, can under the situation that does not as far as possible influence voice quality, reduce the transmission bandwidth of AoIP interface.
Another object of the present invention is to, a kind of speech frame transmission method is provided, can under the situation that does not as far as possible influence voice quality, reduce the transmission bandwidth of AoIP interface.
Voice frame transmission system of the present invention comprises gateway MGW and base station controller BSC, and the A interface AoIP based on the IP transmission is set between described MGW and BSC, and wherein said gateway side comprises yard a type conversion and a rate adapted module; Described BSC side comprises the rate adapted module, wherein, described gateway side comprises that further speech frame sends control module, be used for judging whether the current speech frame is sent to described AoIP interface, to send speech frame to the BSC side by described AoIP interface according to the discontinuous transmission DTX Control Parameter that described sign indicating number type is changed and the rate adapted module is sent; Described BSC side further comprises the speech frame detection module, is used for the speech frame that described MGW side sends over by IP network is detected and recovers.
Wherein, described DTX Control Parameter is the speech frame indication SP that is used for the indication of quiet indication SID frame.
Wherein, described speech frame sends control module, and being used at described SP is 1 o'clock, judges that described speech frame is a voice Speech frame, send to described AoIP interface; At described SP is 0 o'clock, judges that described speech frame is the SID frame.
Wherein, described speech frame sends control module, being used at described SP is that the previous frame of 0 o'clock SID frame is when being the Speech frame, enter mute state, and with after current first SID frame transmission, per 24 frames send a SID frame to the AoIP interface, and the SID frame that other moment TRAU module is exported will be dropped, and finish mute state after receiving the Speech frame.
Wherein, described speech frame detection module is used for when there is the time division multiplexing Abis interface in described BSC, under the voice activation pattern, the Speech frame of receiving is handed down to described rate adapted module, and to put SP be 1; Can not receive the Speech frame at delivery time and then mend an empty frame to described rate adapted module; Under silent mode, receive that whenever a SID frame preserves a duplicate of described speech frame when being handed down to the rate adapted module, every preset time at interval, described duplicate is delivered to described rate adapted module.
In addition, described BSC side may further include speech frame and transmits processing module, is used for speech frame is forwarded to the IP Abis interface; The speech frame detection module can be further used for that the speech frame that described MGW side sends over by IP network is sent to described voice and transmit processing module.
Speech frame transmission method of the present invention comprises the following steps:
Steps A: speech frame is carried out speech coding type conversion and rate adapted in gateway MGW side;
Step B: finish the generation of speech frame in described MGW side, and export discontinuous transmission DTX Control Parameter, and judge whether the current speech frame is sent between MGW and the base station controller BSC on the A interface AoIP that is provided with based on the IP transmission according to described DTX Control Parameter, with by described AoIP interface to BSC side transmission speech frame;
Step C: described BSC side detects the speech frame that sends over by IP network from the MGW side and recovers.
Wherein, the DTX Control Parameter among the described step B is the speech frame indication SP that is used for the indication of quiet indication SID frame.
Wherein, in described step B, be 1 o'clock at described SP, judge that described speech frame is a voice Speech frame, send to described AoIP interface; At described SP is 0 o'clock, judges that described speech frame is the SID frame.
In addition, in described step B, described MGW side is that the previous frame of 0 o'clock SID frame is when being the Speech frame at described SP, enter mute state, and with after current first SID frame transmission, per 24 frames send a SID frame to the AoIP interface, and other SID frame constantly will be dropped, and finish mute state after receiving the Speech frame.
Wherein, when the Abis interface type of described BSC was TDM Abis, under the voice activation pattern, it was 1 that the Speech frame of receiving is issued and put SP; Can not receive the Speech frame at delivery time and then mend an empty frame; Under silent mode, receive that whenever a SID frame preserves a duplicate of described speech frame when being handed down to, every preset time at interval, described duplicate is carried out rate adapted.
Wherein, when the Abis interface type of described BSC is IP Abis, comprise the following steps: described MGW side directly is forwarded on the IP Abis interface by the speech frame that IP network sends over.
The invention has the beneficial effects as follows: according to voice frame transmission system of the present invention and method, send control module and Frame detection module by under original framework, having increased Frame based on the TDM mode, reduce the transmission of unnecessary speech frame at AoIP interface down direction, under the situation that does not influence voice quality, can significantly reduce taking of transmission bandwidth, transmission cost from effective reduction A interface, and this processing keeps original processing framework as far as possible when reducing transmission bandwidth, make things convenient for system upgrade and transformation.
Description of drawings
Fig. 1 is the schematic diagram of existing AoIP interface;
Fig. 2 is the schematic diagram of downlink speech frame transmission system of the AoIP interface DTX pattern of the embodiment of the invention;
Downlink voice frame data process chart when Fig. 3 is an AoIP interface DTX pattern of the present invention;
Fig. 4 sends the state transition diagram of control and frame detection module for frame.
Embodiment
Below, 2～4 detailed voice frame transmission system of the present invention and methods in conjunction with the accompanying drawings.
Fig. 2 is the schematic diagram of downlink speech frame transmission system of the AoIP interface DTX pattern of the embodiment of the invention.Wherein, comprise that in the MGW side yard type conversion and rate adapted (TRAU) module and speech frame send control module; The BSC side comprises rate adapted module and speech frame detection module.
Based on as previously mentioned, move on to MGW at coding and decoding converter TC under the AoIP pattern, therefore, in the MGW side, the TRAU module is used to finish the generation of speech frame (Speech frame or SID frame), and exports some DTX Control Parameter, as is used for the SP bit of SID frame indication.Here, the speech business frame that is generated can be with prior art in the speech business frame that transmits in the Abis interface have the trau frame of same structure, also can be other frame structure, the frame structure of RFC3551 defined for example, this frame only transmits speech payload.Frame sends control module, and the Control Parameter (for example SP bit) that is used for sending according to the TRAU module judges whether speech frame sends to the AoIP interface, to send speech frame by the AoIP interface to the BSC side.
Wherein, when SP is 1, judge that this frame is the Speech frame, send to the AoIP interface; When SP is 0, judge that this frame is the SID frame.Wherein, if the previous frame of this SID frame is the Speech frame, then speech frame transmission this moment control module enters mute state.The speech frame that enters mute state sends control module current first SID frame is sent, and per then 24 frames send a SID frame to the AoIP interface, and promptly every 480ms sends a SID frame, and the SID frame of other TRAU module output constantly will be dropped.This process is up to receiving Speech frame end mute state.
The speech frame detection module is used for the speech frame that the MGW side sends over by IP network is detected and recovers.
Particularly, the speech frame detection module, be used for when the Abis interface type of BSC is TDMAbis, under the voice activation pattern, the Speech frame of receiving is handed down to the rate adapted module, and to put SP be 1, if delivery time (as 20ms at interval) can not receive the Speech frame then mends an empty frame and give the rate adapted module; Under silent mode, receive that whenever a SID frame (putting SP is 0) when being handed down to the rate adapted module preserves a duplicate of this frame, after this every the interval of 20ms, this duplicate is delivered to the rate adapted module.Wherein, this duplicate is updated when next SID frame arrives, and this process finishes silent mode until receive the Speech frame.
In addition, when the Abis interface type of BSC was IP Abis, voice frame transmission system of the present invention further comprised speech frame forwarding processing module in the BSC side, be used for the speech frame that MGW sends directly is forwarded to the IP Abis interface, do not recover and need not carry out rate adapted and frame; The speech frame detection module is further used for that the speech frame that the MGW side sends over by IP network directly is sent to voice and transmits processing module.
As shown in Figure 3, downlink voice frame data process chart wherein, comprises the following steps: during for AoIP interface DTX pattern of the present invention
Step 100: when there was TC in the MGW side, TC at first finished speech coding type conversion and rate adapted;
Step 200: finish the generation of speech frame (Speech frame or SID frame) in the MGW side, and export some DTX Control Parameter, as be used for the SP bit of SID frame indication, and judge according to Control Parameter (for example SP bit) whether speech frame sends on the AoIP interface, to send speech frame to the BSC side by the AoIP interface.
Wherein, the speech business frame that is generated in the step 200 can be with prior art in the speech business frame that transmits in the Abis interface have the trau frame of same structure, also can be other frame structure, the frame structure of RFC3551 defined for example, this frame only transmits speech payload.
In addition, in step 200, when SP is 1, judge that this frame is the Speech frame, send to the AoIP interface; When SP is 0, judge that this frame is the SID frame.Wherein, if the previous frame of this SID frame is the Speech frame, then speech frame transmission this moment control module enters mute state.The speech frame that enters mute state sends control module current first SID frame is sent, and per then 24 frames send a SID frame to the AoIP interface, and promptly every 480ms sends a SID frame, and the SID frame of other TRAU module output constantly will be dropped.This process is up to receiving Speech frame end mute state.
Step 300:BSC side is to detecting, recover or transmit by the speech frame that IP network sends over from the MGW side.
Wherein, when the Abis interface type of BSC was the TDM Abis interface, the described detection method in this step 300 was, under the voice activation pattern, delivery time (20ms at interval) the Speech frame of receiving is then issued, and to put SP is 1, if can not receive the Speech frame then mends an empty frame; Under silent mode, whenever receive the SID frame duplicate that (putting SP is 0) preserves this frame when issuing, after this every the interval of 20ms, this duplicate is carried out rate adapted.In addition, this duplicate is updated when next SID frame arrives.This process finishes silent mode until receive the Speech frame.
Step 400: will carry out Frame after the rate adapted and be encapsulated as speech frame and send to the TDM Abis interface.
Wherein, if the Abis interface type of BSC is the IP Abis interface, then this speech frame directly is forwarded on the IP Abis interface.
The frame that the descending DTX of AoIP handles sends control module and the speech frame detection module has 3 basic status: initial state, voice activation attitude and quiet attitude, its state transition diagram as shown in Figure 4.The initial state that DTX handles is meant when any calling useless exists, and transfers to voice activation attitude (Speech) behind call setup; In the voice activation attitude if receive that the SID frame then is transferred to quiet attitude; In like manner receive that in quiet attitude speech frame then gets back to the voice activation attitude; When voice activation attitude or quiet attitude are received call release message, DTX handles and gets back to initial state.
More than, be that example is described voice frame transmission system of the present invention and method only, but the present invention does not limit to therewith with the FR/EFR business, above-mentioned thought of the present invention and method are suitable for business such as HR, AMR and AMR-WB too.
More than, the present invention mainly is that example is set forth with the trau frame, but is not restricted to trau frame, also can be the frame structure of other type, the change of frame structure, and the variation etc. of band intrinsic parameter does not influence thought of the present invention and method in the frame.
In sum, according to voice frame transmission system of the present invention and method, send control module and Frame detection module by under original framework, having increased Frame based on the TDM mode, reduce the transmission of unnecessary speech frame at AoIP interface down direction, under the situation that does not influence voice quality, can significantly reduce taking of transmission bandwidth, transmission cost from effective reduction A interface, and this processing keeps original processing framework as far as possible when reducing transmission bandwidth, make things convenient for system upgrade and transformation.
More than be in order to make those of ordinary skills understand the present invention; and to detailed description that the present invention carried out; but can expect; in the scope that does not break away from claim of the present invention and contained, can also make other variation and modification, these variations and revising all in protection scope of the present invention.
Claims (12)
1. a voice frame transmission system comprises gateway and base station controller, and the A interface based on the IP transmission is set between described gateway and described base station controller, and wherein said gateway side comprises yard a type conversion and a rate adapted module; Described side of base station controller comprises the rate adapted module, it is characterized in that,
Described gateway side comprises that further speech frame sends control module, be used for judging whether the current speech frame is sent to described A interface based on the IP transmission, to send speech frame to described side of base station controller by described A interface based on the IP transmission according to the discontinuous transmission control parameters that described sign indicating number type is changed and the rate adapted module is sent;
Described side of base station controller further comprises the speech frame detection module, is used for described gateway side is detected, recovers or transmit by the speech frame that IP network sends over.
2. voice frame transmission system as claimed in claim 1 is characterized in that, wherein, described discontinuous transmission control parameters is the speech frame indication that is used for quiet indication frame indication.
3. voice frame transmission system as claimed in claim 2 is characterized in that, described speech frame sends control module, is used for being designated as at 1 o'clock at described speech frame, judges that described speech frame is the speech business frame, send to described A interface based on the IP transmission; Be designated as at 0 o'clock at described speech frame, judge that described speech frame is quiet indication frame.
4. voice frame transmission system as claimed in claim 3, it is characterized in that, described speech frame sends control module, be used for when the previous frame that described speech frame is designated as 0 o'clock quiet indication frame is the speech business frame, enter mute state, and with after current first quiet indication frame transmission, per 24 frames send a quiet indication frame to the A interface based on the IP transmission, the quiet indication frame of other described code conversion of moment and the output of rate adapted module will be dropped, after receiving the speech business frame, finish mute state.
5. voice frame transmission system as claimed in claim 3, it is characterized in that, described speech frame detection module, be used for when the Abis interface type of described base station controller is the time division multiplexing Abis interface, under the voice activation pattern, the speech business frame of receiving is handed down to described rate adapted module, and puts described speech frame and be designated as 1; Can not receive the speech business frame at delivery time and then mend an empty frame to described rate adapted module; Under silent mode, receive that whenever a quiet indication frame preserves a duplicate of described speech frame when being handed down to the rate adapted module, every preset time at interval, described duplicate is delivered to described rate adapted module.
6. voice frame transmission system as claimed in claim 1 is characterized in that, described side of base station controller further comprises speech frame forwarding processing module, is used for speech frame is forwarded to the IP Abis interface; The speech frame detection module is further used for that the speech frame that described gateway side sends over by IP network is sent to described voice and transmits processing module.
7. a speech frame transmission method is characterized in that, comprises the following steps:
Steps A: speech frame is carried out speech coding type conversion and rate adapted at gateway side;
Step B: finish the generation of speech frame at described gateway side, and export discontinuous transmission control parameters, and judge whether the current speech frame is sent between described gateway and the base station controller on the A interface that is provided with based on the IP transmission according to described discontinuous transmission control parameters, to send speech frame to described side of base station controller by described A interface based on the IP transmission;
Step C: described side of base station controller is to detecting, recover or transmit by the speech frame that IP network sends over from described gateway side.
8. speech frame transmission method as claimed in claim 7 is characterized in that, the discontinuous transmission control parameters among the described step B is the speech frame indication that is used for quiet indication frame indication.
9. speech frame transmission method as claimed in claim 8 is characterized in that, in described step B, is designated as at 1 o'clock at described speech frame, judges that described speech frame is the speech business frame, send to described A interface based on the IP transmission; Be designated as at 0 o'clock at described speech frame, judge that described speech frame is quiet indication frame.
10. speech frame transmission method as claimed in claim 9, it is characterized in that, in described step B, when the previous frame that described gateway side is designated as 0 o'clock quiet indication frame at described speech frame is the speech business frame, enter mute state, and with after current first quiet indication frame transmission, per 24 frames send a quiet indication frame to the A interface based on the IP transmission, other quiet indication frame constantly will be dropped, after receiving the speech business frame, finish mute state.
11. speech frame transmission method as claimed in claim 10, it is characterized in that, when the Abis interface type of described base station controller is the time division multiplexing Abis interface, under the voice activation pattern, the speech business frame of receiving is issued and put described speech frame be designated as 1; Can not receive the speech business frame at delivery time and then mend an empty frame; Under silent mode, receive that whenever a quiet indication frame preserves a duplicate of described speech frame when being handed down to, every preset time at interval, described duplicate is carried out rate adapted.
12. speech frame transmission method as claimed in claim 7, it is characterized in that, when the Abis interface type of described base station controller is the IP Abis interface, after carrying out described step C, comprise the following steps: the speech frame that described gateway side sends over by IP network is forwarded on the IP Abis interface.
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| CN107682104A (en) * | 2017-09-15 | 2018-02-09 | 苏州市福川科技有限公司 | Multi-channel audio distance transmission system based on AoIP technologies |
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| FI105306B (en) * | 1997-06-10 | 2000-07-14 | Nokia Networks Oy | Radio |
| FI105372B (en) * | 1997-07-22 | 2000-07-31 | Nokia Networks Oy | Identification of the TRAU frame in a cellular system |
| CN100428744C (en) * | 2006-07-27 | 2008-10-22 | 华为技术有限公司 | Transmission method and system for packet data in communication network |
| CN100456893C (en) * | 2006-09-30 | 2009-01-28 | 华为技术有限公司 | Load-supporting method and system for voice data |
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