CN1501724A - A Method for voice transmission in mobile communication system - Google Patents
A Method for voice transmission in mobile communication system Download PDFInfo
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- CN1501724A CN1501724A CNA021493723A CN02149372A CN1501724A CN 1501724 A CN1501724 A CN 1501724A CN A021493723 A CNA021493723 A CN A021493723A CN 02149372 A CN02149372 A CN 02149372A CN 1501724 A CN1501724 A CN 1501724A
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Abstract
The invention provides a voice transmission method in a mobile communication system wherein, after the calling part initiates the calling, the voice coding scheme is determined based on the transmission mode between the interfaces of the mobile communication system, the calling part BTS transforms the voice coding scheme adopted by the mobile communication system into the said voice coding scheme, the calling part BTS transmits the coded voice information to the called part BTS through calling part BSC, calling part MSC, called part MSC and called part BSC, then the called part BTS completes the decoding of the voice encipher. The method by the invention can reduce the undesired influence to the voice quality by multi time voice coding and the system workload for processing voice decoding.
Description
Technical field
The present invention relates to mobile communication system, relate in particular to voice transmission technology field in the mobile communication system.
Technical background
Mobile communication system comprises gsm system, the CDMA2000 system, WCDMA system etc., in gsm system or CDMA2000 system, comprise base transceiver station (BTS), base station controller (BSC) and mobile switching centre (MSC), in the WCDMA system, comprise corresponding base station (NodeB), radio network controller (RNC) and core net (CN), wherein base transceiver station (BTS) realizes that mobile communication system is by wireless transmission between air interface and the travelling carriage and controlled function, base station controller (BSC) is responsible for the various interface management of base station sub-system (BSS) and the function of RRM, and mobile switching centre (MSC) realizes the exchange and the control of voice and signaling.
Between base transceiver station and the base station controller and the data-interface between base station controller and the mobile switching centre comprise information such as voice channel, signaling channel and Operation and Maintenance channel, the data bandwidth maximum that occupies of voice wherein.The transmission of data is finished by transmission equipment, and transmission means commonly used comprises optical fiber, microwave, digital subscriber line (XDSL), satellite etc.
Present mobile communication system mostly is digital mobile communication system, and promptly the information of handling in the system all is digital information, aforesaid GSM, CDMA2000, WCDMA.For analog informations such as voice, image are converted to digital information, need be by source encoding with the analog information digitlization.As the rule excitation long-term forecast RPE-LTP that GSM adopts, the voice source encoding modes such as incremental pulse code modulation ADPCM that CDMA adopts.
The source encoding of voice mainly needs to consider several indexs.
It at first is voice quality.The general method that adopts subjective assessment, i.e. average ratings score (MOS), 1-5 branch altogether.Wherein quality perfection in 5 fens; 4-5 divides high-quality, is network level; It is communication level (3.5-4 is divided into practical communication level) that the 3-4 branch has distortion; Should not distinguish the talker below 3 minutes.
Next is the data volume behind the coding.High-quality voice quality might not corresponding high code rate.Speech coding generally comprises wave coder (as PCM, ADPCM), sound source encoder (as linear predictive coding LPC) and hybrid coder (as RPE-LTP), and comparatively speaking, the wave coder voice quality is best, and code rate is bigger simultaneously; The sound source encoder is second-rate, and speed is lower; Hybrid coder is placed in the middle.Pcm encoder speed commonly used is 64k, and ADPCM is 32k, and RPE-LTP pure code speed is 13k (comprise information such as error correction after total code rate 16k).Speech encoding rate and voice quality more as shown in Figure 1, wherein dotted line is a goal in research.
And then for special application system such as mobile communcations system, because the severity of radio transmission conditions, the source encoding that need to consider adopts has good resistivity for transmission error rates etc., promptly can not bring ill effect to voice quality because of the raising of the wireless transmission error rate.
At last, the complexity that comprises speech coding processing delay and encoding and decoding work of treatment amount.Should be controlled in a few tens of milliseconds time delay.Workload is generally represented with the treating capacity MIPS (MIPS) of digital signal processor DSP.Being compared as follows shown in the table of several voice coding modes commonly used.
| Encoder type | Code rate (kbps) | Complexity MIPS | Time delay (ms) | Voice quality |
| Pulse code modulation | ?64 | ??0.01 | ??0 | Senior |
| The self adaptation pulse code modulation | ?32 | ??0.1 | ??0 | Senior |
| Adaptive sub frequency range coding | ?16 | ??1 | ??25 | Senior |
| Multi-pulse LPC | ?8 | ??10 | ??35 | The communication level |
| The arbitrary excitation linear predictive coding | ?4 | ??100 | ??35 | The communication level |
| The vocoder of linear predictive coding | ?2 | ??1 | ??35 | Synthetic level |
As mentioned above, the voice coding modes that mobile communcations system is selected for use needs good resistance wireless transmission bit error performance, to solve the transmission error code that may exist between travelling carriage and base station.But between base station and base station controller or the interface between base station controller and mobile switching centre transmission be to finish by special transmission system, the antagonism transmission error code can be finished by transmission system self.
And encoding and decoding speech can bring to a certain degree damage to voice quality, and encoding-decoding process need increase the workload of system, and repeatedly encoding and decoding will increase the data traffic between the mobile communication system interface.Simultaneously, the link cost of part transmission means is very high, as satellite transmits.
Summary of the invention
Purpose of the present invention is exactly to propose a kind of voice transmission method in mobile communication system, can make this method when reducing data traffic between the mobile communcations system interface, reducing transmission bandwidth, alleviate repeatedly speech coding the adverse effect of voice quality and the workload of system handles encoding and decoding speech.
Voice transmission method in a kind of mobile communication system may further comprise the steps:
After a, calling party make a call, determine voice coding modes according to the transmission means between the mobile communication system interface;
B, calling party's base transceiver station (BTS) convert the voice coding modes that mobile communication system adopts to step a described voice coding modes;
C, calling party mobile exchange center (MSC) judge whether this is called out is the whether no secondary coding function of support voice compression of calling between travelling carriage and the travelling carriage and callee's base transceiver station (BTS), if above-mentioned two conditions all satisfy, then enter steps d;
Voice messaging after d, calling party's base transceiver station (BTS) will be encoded is transferred to callee's base transceiver station (BTS) by calling party's base station controller (BSC), calling party mobile exchange center (MSC), callee mobile switching centre (MSC), callee's base station controller (BSC);
E, callee's base transceiver station (BTS) are finished the decoding of speech coding.
Two conditions are not all satisfied among the described step c, are then finished the decoding of speech coding by calling party mobile exchange center (MSC) or calling party's base station controller (BSC).
The described transmission means of described step a can be a satellite transmits.
Described step b may further include following steps:
B1, the voice coding modes that mobile communication system is adopted convert PCM to;
B2, convert PCM to step a described voice coding modes.
Also the voice coding modes that mobile communication system adopts can be directly changed into the described voice coding modes of step a among the described step b.
Adopted the present invention, only carry out encoding and decoding speech one time owing to call out the whole communication process of travelling carriage at travelling carriage, can reduce data traffic between the mobile communcations system interface, reduce transmission bandwidth, alleviate repeatedly speech coding to the adverse effect of voice quality and the workload of system handles encoding and decoding speech, thereby reduce the lease expenses of the interface transmission link between base transceiver station and base station controller, base station controller and the mobile switching centre.
Description of drawings
Fig. 1 is that speech encoding rate and voice quality compare schematic diagram;
Fig. 2 is a voice transfer flow chart of the present invention;
Fig. 3 is a gsm system voice transfer flow chart in the embodiment.
Embodiment
Below in conjunction with accompanying drawing the specific embodiment of the present invention is described.
As shown in Figure 2, generally speaking, for a kind of speech coding type (wave coder, sound source encoder and hybrid coder), voice quality and code rate are directly proportional substantially.In order to obtain the ratio of performance to price of good voice quality and transmission lease expenses, should select suitable transferring voice coded system A according to the transmission link lease expenses situation that adopts transmission means between base transceiver station and the base station controller.Promptly when the link lease expenses is higher, can select the coded system that code rate is less, voice quality is higher that adopts voice coding modes than existing mobile communication system for use; When the link lease expenses is very high (as satellite transmits), can select for use than existing mobile communication system adopt the code rate of voice coding modes low more, coded system that voice quality is relatively poor.
Behind selected appropriate interface transferring voice coded system A, the voice coding modes B that mobile communication system adopts need be converted to A.
Because now usually encoding and decoding speech method and the chip majority that adopts is target with PCM, so after will having coded system B now and being converted to PCM, it is fairly simple to be converted to the operation of coded system A by PCM again.Exist in the existing mobile switching centre and will have the unit that coded system B is converted to PCM now, can directly use, and then PCM is converted to coded system A, and realizing compress speech, the encoding and decoding of voice coding modes commonly used at present have more ready-made algorithm and chip available.
If have ready-made coded system B to be directly changed into algorithm and the chip of coded system A, also can directly finish the conversion and the compression of voice.
After voice coding modes was converted to A, the interface data that comprises voice channel was at base transceiver station and base station controller, and transmitted between base station controller and the mobile switching centre.
In order to be implemented in the whole calling procedure, only carry out the encoding and decoding processing procedure of a compress speech, need to satisfy two conditions:
One, called must be the mobile subscriber, i.e. caller to called all be the mobile subscriber.Because if called is fixed-line subscriber, then need finish the decoding process of compress speech in fixing switching center's side, and fixedly switching center belongs to different systems with mobile system, and existing simultaneously fixedly switching center's kind is more, in the fixing switching center bigger difficulty of existence that realizes decoding.So only the process that mobile calls is moved realizes the no secondary coding function of compression.
Its two, the callee side base station must support voice the no secondary coding function of compression.Promptly in the decoding function of callee base station support voice compression, also need to support to finish by callee's base transceiver station without the compress speech decoding of base station controller and mobile switching centre.
The judgement of above-mentioned two conditions is judged by mobile switching centre.
When these two conditions satisfy simultaneously, after calling party's base transceiver station is finished compress speech, then arrive between calling party's base station controller at whole calling party's base transceiver station, calling party's base station controller is to calling party mobile exchange center, calling party mobile exchange center is to callee mobile switching centre, callee mobile switching centre is to callee's base station controller, callee's base station controller is in the voice messaging transmission course of callee's base transceiver station, do not carry out the decoding (decompression) of speech coding, and only carry out the decoding of speech coding at callee's base transceiver station.
When these two conditions can not satisfy simultaneously, then can't realize the no secondary coding processing procedure of compress speech, need finish the decoding of speech coding in home base stations controller or mobile switching centre's side.
If adopt the transmission link lease expenses of transmission means lower and transfer resource abundant between base station controller and the mobile switching centre, can finish the decoding of compress speech in mobile switching centre.Otherwise carry out at base station controller.
As shown in Figure 3, when above-mentioned mobile communication system is Golbal System for Mobile Communic-ations (GSM), at base transceiver station the rule excitation long-term forecast RPE-LTP that GSM adopts is converted to suitable voice coding modes, Multi-pulse LPC or the code rate lower arbitrary excitation linear predictive coding lower as code rate, when mobile switching centre's Rule of judgment satisfies, only finish the decode procedure of speech coding at callee's base transceiver station.
Total code rate 16k of RPE-LTP.Under the channel quality good situations, voice quality can reach 4.0; When carrier/interface ratio was 10dB, voice quality descended, the MOS value 0.2-0.8 that descends approximately; When carrier/interface ratio was 4dB, the MOS value was about 2.
So that save the purpose of transmission, can consider to be compressed to 8k or lower in order to reach compress speech.
When interface transmission link expense when not being very high (as Optical Fiber Transmission), can adopt the mode of compress speech to 8k.The hybrid coder that present multiple code rate is 8k can reach good voice quality, and as Multi-pulse LPC, codebook excited linear predictive coding etc., its MOS value is higher communication level level between 3.5-4.0.
When interface transmission link expense is very high (as satellite transmits), can adopt compress speech to lower mode as 4k.The hybrid coder that more present code rates are 4k can reach the voice quality of communication level, and as the arbitrary excitation linear predictive coding, its MOS value is communication level level greater than 3.0.
Whether after the compress speech mode is determined, judging whether to satisfy simultaneously this calling by moving exchanging center MSC is to move to mobile calling, the opposite end base transceiver station of the callee side no secondary coding function whether support voice is compressed simultaneously.If satisfy, then only finish the decoding process of compress speech, to realize the no secondary coding function of compress speech in called base transceiver station side.
By the consideration of transmission link lease expenses between docking port, select suitable transfer encoding mode.Can when guaranteeing good voice quality, transmission bandwidth be reduced by half substantially, also can under the situation of sacrificing certain voice quality, transmission bandwidth be reduced to about four/the last one.Thereby can reach the good voice quality and the ratio of performance to price of transmission lease expenses, improve the competitiveness of base station equipment.
And then when satisfying, condition in the communication process that whole mobile calls moves, only comprises once compress speech encoding-decoding process.When reducing data traffic between the mobile communcations system interface, reducing transmission bandwidth, reduce the number of times of encoding and decoding speech, thereby alleviate repeatedly speech coding the adverse effect of voice quality and the workload of system handles encoding and decoding speech.
The above; only for the preferable embodiment of the present invention, but protection scope of the present invention is not limited thereto, and anyly is familiar with the people of this technology in the disclosed technical scope of the present invention; the variation that can expect easily or replacement all should be encompassed within 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 (5)
1, voice transmission method in a kind of mobile communication system is characterized in that may further comprise the steps:
After a, calling party make a call, determine voice coding modes according to the transmission means between the mobile communication system interface;
B, calling party's base transceiver station (BTS) convert the voice coding modes that mobile communication system adopts to step a described voice coding modes;
C, calling party mobile exchange center (MSC) judge whether this is called out is the whether no secondary coding function of support voice compression of calling between travelling carriage and the travelling carriage and callee's base transceiver station (BTS), if above-mentioned two conditions all satisfy, then enter steps d;
Voice messaging after d, calling party's base transceiver station (BTS) will be encoded is transferred to callee's base transceiver station (BTS) by calling party's base station controller (BSC), calling party mobile exchange center (MSC), callee mobile switching centre (MSC), callee's base station controller (BSC);
E, callee's base transceiver station (BTS) are finished the decoding of speech coding.
2, voice transmission method in the mobile communication system as claimed in claim 1 is characterized in that: two conditions are not all satisfied among the step c, are then finished the decoding of speech coding by calling party mobile exchange center (MSC) or calling party's base station controller (BSC).
3, voice transmission method in the mobile communication system as claimed in claim 1 is characterized in that: the described transmission means of step a can be a satellite transmits.
4, voice transmission method in the mobile communication system as claimed in claim 1, it is characterized in that: step b further may further comprise the steps:
B1, the voice coding modes that mobile communication system is adopted convert PCM to;
B2, convert PCM to step a described voice coding modes.
5, voice transmission method in the mobile communication system as claimed in claim 1 is characterized in that: the voice coding modes that mobile communication system adopts can be directly changed into the described voice coding modes of step a among the step b.
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| CN 02149372 CN1243449C (en) | 2002-11-13 | 2002-11-13 | A Method for voice transmission in mobile communication system |
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| CN 02149372 CN1243449C (en) | 2002-11-13 | 2002-11-13 | A Method for voice transmission in mobile communication system |
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| CN1243449C CN1243449C (en) | 2006-02-22 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007118380A1 (en) * | 2006-04-18 | 2007-10-25 | Huawei Technologies Co., Ltd. | Method, system and device for negotiating voice coding/decoding in communication system |
| CN101106737B (en) * | 2007-08-01 | 2010-10-06 | 北京华大恒泰科技有限责任公司 | Base station, terminal, wireless communication system and ID query and voice communication combination method |
| WO2011029309A1 (en) * | 2009-09-14 | 2011-03-17 | 中兴通讯股份有限公司 | Method for user plane data transmission based on an iur-g interface and equipment thereof |
| CN101222690B (en) * | 2008-02-01 | 2012-12-12 | 华为技术有限公司 | Code switching method, system and device |
| CN101801028B (en) * | 2010-01-22 | 2013-11-06 | 上海华为技术有限公司 | Method, device and system for informing business option information and transmitting voice |
| CN112887497A (en) * | 2020-12-24 | 2021-06-01 | 武汉船舶通信研究所（中国船舶重工集团公司第七二二研究所） | Communication method, apparatus and computer storage medium |
-
2002
- 2002-11-13 CN CN 02149372 patent/CN1243449C/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007118380A1 (en) * | 2006-04-18 | 2007-10-25 | Huawei Technologies Co., Ltd. | Method, system and device for negotiating voice coding/decoding in communication system |
| US7764953B2 (en) | 2006-04-18 | 2010-07-27 | Huawei Technologies Co., Ltd. | Method, system and device for speech Codec negotiation in communication system |
| CN101167374B (en) * | 2006-04-18 | 2011-02-09 | 华为技术有限公司 | Method, system and device for negotiating voice coding/decoding in communication system |
| CN101106737B (en) * | 2007-08-01 | 2010-10-06 | 北京华大恒泰科技有限责任公司 | Base station, terminal, wireless communication system and ID query and voice communication combination method |
| CN101222690B (en) * | 2008-02-01 | 2012-12-12 | 华为技术有限公司 | Code switching method, system and device |
| WO2011029309A1 (en) * | 2009-09-14 | 2011-03-17 | 中兴通讯股份有限公司 | Method for user plane data transmission based on an iur-g interface and equipment thereof |
| CN101801028B (en) * | 2010-01-22 | 2013-11-06 | 上海华为技术有限公司 | Method, device and system for informing business option information and transmitting voice |
| CN112887497A (en) * | 2020-12-24 | 2021-06-01 | 武汉船舶通信研究所（中国船舶重工集团公司第七二二研究所） | Communication method, apparatus and computer storage medium |
| CN112887497B (en) * | 2020-12-24 | 2022-11-01 | 武汉船舶通信研究所（中国船舶重工集团公司第七二二研究所） | Communication method, apparatus and computer storage medium |
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| CN1243449C (en) | 2006-02-22 |
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