CN101309487B - Voice frame processing method, system and base station - Google Patents
Voice frame processing method, system and base station Download PDFInfo
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- CN101309487B CN101309487B CN2008101324356A CN200810132435A CN101309487B CN 101309487 B CN101309487 B CN 101309487B CN 2008101324356 A CN2008101324356 A CN 2008101324356A CN 200810132435 A CN200810132435 A CN 200810132435A CN 101309487 B CN101309487 B CN 101309487B
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Abstract
The invention discloses a processing method for a voice frame, a system and a base station. The method comprises the following steps: under the local loopback circumstance, a prestored mute SID frame required to be sent in the down direction is confirmed; the prestored mute SID frame is encoded and sent in the down direction. By utilizing the embodiment of the invention, the local stored mute SID frame is used for encoding and transmitting as required, the voice quality after the local loopback can be improved, and thereby the voice quality after the local loopback is equivalent to the voice service quality under the nonlocal loopback circumstance.
Description
Technical field
The present invention relates to communication technical field, relate in particular to a kind of processing method, system and base station of speech frame.
Background technology
GSM (Global System for Mobile Communications, global system for mobile communications) in the system, BSS (Base Station System, base station system) usually by a BSC (Base StationController, base station controller) and one or more BTS (Base Transceiver Station, base transceiver station) forms, BSC and MSC (Mobile Switching Center wherein, mobile switching centre) links to each other, BTS is by wave point and MS (Mobile Station, travelling carriage) link to each other, BTS is responsible for wireless transmission, BSC is responsible for control and management.And MSC further comprises MSC Server (MSC server) and MGW (Media Gateway, media gateway).
Along with the continuous maturation of GSM, mobile network's development speed is far faster than the development speed of fixed network.Along with the network expansion, it is fierce that the competition between the operator also is tending towards, and therefore will manage to reduce cost, and saving transmission is important focus.Solve the saving transmission manner multiple modes such as compression, IP transmission, local loopback are arranged.Local loopback (also can be called local exchange) mode specifically refers to: when GSM network B SS side finds that two users' conversation all belongs to this BSS, can not need to exchange to carrying out voice service, make two users converse but directly voice link is directly exchanged by BSS by the A mouth.Further can directly exchange in the BTS side and finish user's communication conversation between the user of same or same group BTS.Such mode can save BSC to the transmission between MSC and BTS to the transmission between BSC.
The inventor finds that there is following problem at least in prior art in realizing process of the present invention:
Local loopback does not pass through TC (Trans-Coder, code conversion) processing for voice service and the MSC exchange is handled, and therefore directly may there be some problems in the situation of local loopback.During such as the decoding failure on up direction, if through the smoothing processing of TC, then the recipient still can receive level and smooth sound on down direction, but for the situation of direct local loopback, because of there not being the smoothing processing of TC, the recipient can only receive noise.
Summary of the invention
Embodiments of the invention provide a kind of processing method, system and base station of speech frame, improve the speech business quality under the local loopback situation.
Embodiments of the invention provide a kind of processing method of speech frame, comprising:
Under the local loopback situation, when the code check adaptation unit trau frame that receives is the decoding failure frame, and/or under the local loopback situation, under the discontinuous emission DTX situation, when judgement needs to send the SID frame, determine and to send the quiet SID frame of storing in advance at down direction;
The described quiet SID frame of storage is in advance encoded and sent at down direction.
Embodiments of the invention also provide a kind of base station, comprising:
Judging unit is used under the local loopback situation, determines to send the quiet SID frame of storage in advance at down direction;
Processing unit is used for the described quiet SID frame of storage is in advance encoded and sent at down direction;
Described judging unit further comprises:
First judgment sub-unit is used for when the code check adaptation unit trau frame that receives is the decoding failure frame, determines the quiet SID frame that need store in advance in descending transmission; And/or
Second judgment sub-unit is used under the discontinuous emission DTX situation, sends opportunity of SID frame at the needs of regulation, determines the quiet SID frame that need store in advance in descending transmission.
Embodiments of the invention also provide a kind of network, comprise above-mentioned base station.
Compared with prior art, embodiments of the invention have the following advantages:
The application of the invention embodiment, the quiet SID frame that uses this locality to store is encoded and is sent when needed, can improve the speech quality behind the local loopback, make that the speech quality behind the local loopback can be suitable with the speech business quality under the non-local loopback situation.
Description of drawings
Fig. 1 is a normal and local loopback trau frame schematic flow sheet in the prior art;
Fig. 2 is the process flow figure of speech frame in the embodiment of the invention;
Fig. 3 is the structural representation of speech frame processing unit in the embodiment of the invention;
Fig. 4 is another structural representation of speech frame processing unit in the embodiment of the invention.
Embodiment
The handling process of speech business is as follows in the gsm system at present: user A and user B converse, and user terminal carries out source encoding to the speech that collects, and are eating dishes without rice or wine to send to the base station through chnnel coding then; The base station becomes TRAU (Transfer Rate Adapter Unit through after the channel decoding, the code check adaptation unit) frame, by ABIS (BSC and BTS E1 Interface, communication interface between BSC and the BTS) mouthful trau frame is sent to the tc unit on the BSC, tc unit is exchanged by MSC after trau frame is carried out sending to the A mouth after cell is deciphered, may exchange to PSTN (Public SwitchedTelephone Network, PSTN), also may exchange to other MSC or these MSC.On the down direction, the speech of A mouth carries out source encoding through TC and becomes trau frame and be sent to the base station, the base station is carried out chnnel coding and is being eated dishes without rice or wine to send to user terminal, user terminal becomes speech after the cell decoding unit is deciphered cell and emits to the user through after the channel decoding data being given the cell decoding unit of user terminal.
In utilization such as local loopback scene, speech directly exchanges at BSC or BTS without TC and A mouth, and the downlink voice trau frame that receive the base station directly is exactly the ascending voice trau frame of another one base station or this base station, as shown in Figure 1.Originally all callings all will be passed through BTS-BSC-TC-MSC-MSC-TC-BSC-BTS or BTS-BSC-TC-MSC-PSTN (situations shown among Fig. 11 and 2).But behind the local loopback, a lot of local calls all are that original exchange route is still walked in other non-local calls through BTS-BSC-BTS or BTS-BTS (situations shown among Fig. 1 3～6).
Under non-local loopback situation, below two kinds of situations can not cause problem:
1, the base station receives that the signal of user terminal deciphers unsuccessful, then will inform the TC decoding failure by trau frame, TC will carry out special level and smooth voice cell decoding processing and send to the A mouth, so the speech frame after level and smooth that is that exchanges to opposite end TC of process A mouth; The TRAU speech frame of receiving for base station on the down direction all has been a frame so.
2, under DTX (Discontinuous Transmit, the discontinuous emission) situation, when referring to that the user is silent and not sending signal, just when speech is from having is not having and on the opportunity of stipulating, send SID (SilenceDescriptor, silence descriptor) frame.Concrete, can comprise the opportunity that sends the SID frame: if Speech frame is from having to do not having then send a SID frame, send a new SID frame in cycle until new voice signal is arranged at each SACCH (Slow AssociatedControl Channel, slowly associated control channel) afterwards.The SID frame to be sent in up be that the transmit leg user terminal is finished, then need TC during no speech, to generate the SID frame and be handed down to the recipient base station descending, during the descending SID frame of the TC that the recipient base station receives, then send the SID frame that this receives.
After calling becomes local loopback, above-mentioned two kinds owing to passed through TC and handle no problem situation and just need the base station to handle, otherwise will impact speech, cause speech that noise and background noise poor quality are arranged, reason is as follows:
1, for up decoding failure frame, if local loopback, decoding failure TRAU speech frame will be received in the base station on down direction, because up-downgoing control bit's is asymmetric, can't know it is the decoding failure frame, to directly encode to this frame and send in the base station like this, and user terminal receives that such speech frame will produce noise.
2, DTX situation, when arriving the recipient base station behind the upstream sid frame process local loopback that transmit leg sends, can cause the recipient base station to receive the time-delay of SID frame, cause the base station can not receive the SID frame, then cause sending uncertain frame and make user terminal produce noise and error code on the opportunity that regulation sends the SID frame.
In order to address the above problem, embodiments of the invention provide a kind of processing method of speech frame, as shown in Figure 2, may further comprise the steps:
Under step s201, the local loopback situation, determine and to send the quiet SID frame of storage in advance at down direction.
Concrete, in following two kinds of situations, can determine and need send the quiet SID frame of storage in advance: when the trau frame that (1) receives is the decoding failure frame, determine to send the quiet SID frame of local storage at down direction at down direction; (2) under the discontinuous emission DTX situation,, determine to send at down direction the quiet SID frame of local storage on the opportunity of the needs transmission SID of regulation frame.
Step s202, the quiet SID frame that will store are in advance encoded and are sent at down direction.
Concrete, quiet SID frame of this described storage in advance can for: for each channel is stored a quiet SID frame in advance; Or use a quiet SID frame of storage in advance for all channels.
Application scenarios below in conjunction with concrete describes in further detail embodiments of the present invention.
In the embodiments of the invention, for full rate EFR (Enhanced Full Rate, the enhanced full rate speed encoding decoder)/FR (Full Rate, the full-rate codes decoder) speech business, trau frame is carried out special processing, make that distinguishing the voice trau frame on the down direction be from TC, or from the up trau frame under the loopback of base station.First concrete, as can to carry according to the trau frame that the receives sign determines whether the trau frame that receives is the descending trau frame that TC sends.For example, the control bit C20C21=00 that can be provided with in the trau frame represents that this trau frame is produced by up trau frame loopback, and C20C21=11 represents that this trau frame is produced by TC.For HR (HalfRate, half rate) speech business and AMR (Adaptive Multi-Rate, the self adaptation multiple bit rate) speech business, can not need to distinguish the voice trau frame and be from TC, or the up trau frame that gets off from the base station loopback, because the up-downgoing trau frame structure of these two kinds of speech businesses is identical.
Coding for the SID frame sends, and embodiments of the invention provide following processing method: the base station generates a SID frame in advance, and what this SID frame can normally be deciphered and produce after requiring user terminal to receive is quiet.The base station is that each channel sets up corresponding quiet buffering area, will this quiet trau frame when certain channel has just activated be put into the quiet buffering area A place of this channel.If receive SID frame (no matter this SID frame is from TC or from loopback) at the down direction of this channel afterwards, then this SID frame is stored into the quiet buffering area A of this channel, promptly whenever receive a SID frame and just upgrade once quiet buffering area A.When this channel need be encoded the SID frame (receiving SID frame opportunity and needing to send opportunity of SID frame), the SID frame that takes out wherein storage from the quiet buffering area A of this channel is encoded and is sent.Under the normal condition, the SID frame that TC sends will upgrade the data among the quiet buffering area A, and SID frame that takes out from quiet buffering area A again when needing coding SID frame and the SID frame that originally directly receives do not have essential distinction, are more than once transfer.Under the loopback situation, even the time-delay of decoding failure or SID frame occurs, also can directly take out the SID frame from quiet buffering area A encodes, what adopt during coding is up-to-date SID frame or the SID frame that sets in advance, user terminal receives that such frame is equivalent to delay time, but therefore sound and down-run survey can not have problems.
Safeguard the SID frame for each channel except above-mentioned, can also be adopted as the method that all channels use identical SID frame, be all channels unified quiet buffering area is set, a SID frame that pre-sets is stored in advance into the quiet buffering area of this unification.When the down direction of arbitrary channel receives new SID, use this SID frame that the common SID frame that uses of all channels in the quiet buffering area is upgraded.For the using method of SID frame in this unified quiet buffering area, with above-mentioned when using different quiet buffering area for different channels the using method of SID frame similar.
If normal trau frame situation, so above-mentioned processing and processing of the prior art are as broad as long.But if what receive on down direction is the trau frame of local loopback, and this frame identification is up decoding failure, can not directly encode with this trau frame and send on the down direction so.And should encode and send the SID frame at the quiet buffering area A place of leaving channel in, for the situation of using different quiet buffering areas for different channels, use SID frame in the quiet buffering area of this channel to encode and send; For the situation of using unified quiet buffering area for different channels, use the SID frame at the quiet buffering area place of this unification to encode and send.Concrete, for the up trau frame of local loopback, can judge that described trau frame is the decoding failure frame according to second sign of described trau frame.For example,,, so just see the whether successfully decoded C12 bit (BFI) of indication,, represent successfully decodedly, after judgement is speech frame again, then this trau frame is encoded and send if BFI equals 0 if C20C21 equals 00 for full rate EFR/FR speech business; If BFI equals 1, the expression decoding failure is then got the SID frame and is encoded and send from the quiet buffering area A of channel, and user terminal will can not produce noise like this.For half rate HR and the also similar processing of AMR.For HR or AMR speech business, can not need to distinguish from TC or the up trau frame that gets off from the base station loopback, but can judge whether this trau frame is good speech by existing sign, judge successfully decoded during for good speech, otherwise the judgement decoding failure, and whether successfully carry out corresponding control according to decoding.
For the DTX situation, when the upstream sid frame takes place through time-delay is arranged behind the local loopback, send opportunity of SID frame in regulation, directly from the quiet buffering area A of channel, get the SID frame and encode and send and get final product, thereby avoid at user terminal generation noise.
The method that provides in the application of the invention the foregoing description, the quiet SID frame that uses this locality to store is encoded and is sent when needed, can improve the speech quality behind the local loopback, avoid under the measured situation of the matter of eating dishes without rice or wine, can cause the opposite end noise to occur behind the local loopback when up DTX uses.For the situation of non-local loopback, such processing and original processing are as broad as long, the processing of compatible normal condition and local loopback situation.
Embodiments of the invention also provide a kind of base station, and its structure comprises as shown in Figure 3:
Concrete, the base station in the embodiments of the invention can also be as shown in Figure 4, wherein:
This base station can also comprise:
First updating block 40, be used for when arbitrary channel when down direction is received the SID frame, store the SID frame that receives into receive the channel of SID frame described in first memory cell 30 quiet buffering area, upgrade the SID frame of storing before in the described quiet buffering area and offer processing unit 20 when needed.
Perhaps, this base station can also comprise:
Second updating block 60, be used for when arbitrary channel when down direction is received the SID frame, store the SID frame that receives in second memory cell 50 quiet buffering area, upgrade in the described quiet buffering area before storage the SID frame and offer processing unit 20 when needed.
Embodiments of the invention also provide a kind of network system, comprise the base station described in above-mentioned Fig. 3 and Fig. 4, are not repeated in this description at this for the structure of this base station.
The equipment that the application of the invention embodiment provides, the quiet SID frame that uses this locality to store is encoded and is sent when needed, can improve the speech quality behind the local loopback, make speech business quality behind the local loopback and the speech business quality under the non-local loopback situation be more or less the same.If do not handle like this,, when using, up DTX can cause the opposite end noise to occur behind the local loopback even under the measured situation of the matter of eating dishes without rice or wine.For the situation of non-local loopback, such processing and original processing are as broad as long, the processing of compatible normal condition and local loopback situation.
Through the above description of the embodiments, those skilled in the art can be well understood to the present invention and can realize by the mode that software adds essential general hardware platform, can certainly pass through hardware, but the former is better execution mode under a lot of situation.Based on such understanding, the part that technical scheme of the present invention contributes to prior art in essence in other words can embody with the form of software product, this computer software product is stored in the storage medium, comprises that some instructions are used so that a station terminal equipment is carried out the described method of each embodiment of the present invention.
More than disclosed only be several specific embodiment of the present invention, still, the present invention is not limited thereto, any those skilled in the art can think variation all should fall into protection scope of the present invention.
Claims (10)
1. the processing method of a speech frame is characterized in that, comprising:
Under the local loopback situation, when the code check adaptation unit trau frame that receives is the decoding failure frame, and/or under the local loopback situation, under the discontinuous emission DTX situation, when judgement needs to send the SID frame, determine and to send the quiet SID frame of storing in advance at down direction;
The described quiet SID frame of storage is in advance encoded and sent at down direction.
2. the processing method of speech frame according to claim 1 is characterized in that, describedly stores quiet SID frame in advance and comprises:
For each channel is provided with a quiet buffering area, a SID frame that pre-sets is stored in advance into the quiet buffering area of described each channel.
3. as the processing method of speech frame as described in the claim 2, it is characterized in that, also comprise:
When arbitrary channel is received descending SID frame, store the described SID frame that receives the quiet buffering area of the channel of the described SID of receiving frame into, upgrade in the described quiet buffering area before the SID frame of storage.
4. the processing method of speech frame according to claim 1 is characterized in that, describedly stores quiet SID frame in advance and comprises:
For each channel is provided with unified quiet buffering area, store a SID frame that pre-sets into described quiet buffering area in advance.
5. as the processing method of speech frame as described in the claim 4, it is characterized in that, also comprise:
Arbitrary channel stores the described SID frame that receives into described quiet buffering area when receiving descending SID frame, upgrade in the described quiet buffering area before the SID frame of storage.
6. the processing method of speech frame according to claim 1 is characterized in that the trau frame that described judgement receives comprises for the decoding failure frame:
According to first sign that the trau frame that receives carries, determine that the trau frame that receives is the descending trau frame that transcoding function TC sends; Or
According to first sign that the trau frame that receives carries, determine that the trau frame that receives is the up trau frame by local loopback; And judge that according to second sign of described trau frame described trau frame is the decoding failure frame.
7. a base station is characterized in that, comprising:
Judging unit is used under the local loopback situation, determines to send the quiet SID frame of storage in advance at down direction;
Processing unit is used for the described quiet SID frame of storage is in advance encoded and sent at down direction;
Described judging unit further comprises:
First judgment sub-unit is used for when the code check adaptation unit trau frame that receives is the decoding failure frame, determines the quiet SID frame that need store in advance in descending transmission; And/or
Second judgment sub-unit is used under the discontinuous emission DTX situation, sends opportunity of SID frame at the needs of regulation, determines the quiet SID frame that need store in advance in descending transmission.
8. as base station as described in the claim 7, it is characterized in that, also comprise:
First memory cell is used to be provided with a plurality of quiet buffering areas, and the corresponding channel of each quiet buffering area stores a SID frame that pre-sets into described each quiet buffering area in advance;
First updating block, be used for when arbitrary channel when down direction is received the SID frame, store the described SID frame that receives into receive the channel of SID frame described in described first memory cell quiet buffering area, upgrade the SID frame of storing before in the described quiet buffering area and offer described processing unit when needed.
9. as base station as described in the claim 7, it is characterized in that, also comprise:
Second memory cell is used to be provided with the quiet buffering area of a unification, stores a SID frame that pre-sets into described quiet buffering area in advance;
Second updating block, be used for when arbitrary channel when down direction is received the SID frame, store the described SID frame that receives in described second memory cell quiet buffering area, upgrade in the described quiet buffering area before storage the SID frame and offer described processing unit when needed.
10. a network system is characterized in that, comprises each described base station in the aforesaid right requirement 7 to 9.
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| CN2008101324356A CN101309487B (en) | 2008-07-15 | 2008-07-15 | Voice frame processing method, system and base station |
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| CN101989935A (en) | 2009-08-07 | 2011-03-23 | 华为技术有限公司 | Phonetic loopback method in voice over internet protocol (VoIP) internet, gateway, loopback node and internet |
| US10715575B2 (en) * | 2015-06-02 | 2020-07-14 | Dolby Laboratories Licensing Corporation | In-service quality monitoring system with intelligent retransmission and interpolation |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1155801A (en) * | 1995-10-13 | 1997-07-30 | 法国电信公司 | Method and device for making pleasant noice in speech digital transmitting system |
| CN101098545A (en) * | 2006-06-27 | 2008-01-02 | 中兴通讯股份有限公司 | Mobile station system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1155801A (en) * | 1995-10-13 | 1997-07-30 | 法国电信公司 | Method and device for making pleasant noice in speech digital transmitting system |
| CN101098545A (en) * | 2006-06-27 | 2008-01-02 | 中兴通讯股份有限公司 | Mobile station system |
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