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Method and system implementing speech passing through in mobile network

A voice transparent transmission, mobile network technology, applied in transmission systems, electrical components, wireless communication and other directions, can solve the problems of reducing voice quality, unable to achieve normal communication, wasting vocoder resources, etc.

Active Publication Date: 2011-07-27
CHINA TELECOM CORP LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this transformation is that the voice quality is reduced, and the vocoder resources are wasted
[0004] Due to the IP-based voice transmission, voice compression codecs are introduced into the network. In CDMA networks, voice codec algorithms such as EVRC and QCELP13K (13K high-pass code-excited linear prediction) are commonly used. When passing through the IP-based media transmission unit, the vocoder must be bypassed, otherwise normal communication will not be achieved

Method used

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  • Method and system implementing speech passing through in mobile network
  • Method and system implementing speech passing through in mobile network
  • Method and system implementing speech passing through in mobile network

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0076] Embodiment 1: TDM transmission between BSS and MGW, and IP transmission between MGW and MGW, refer to Figure 4 shown.

[0077] After BSS1 receives the instruction message that the communication terminal switches from ordinary voice communication to voice transparent transmission communication, it stops the codec processing procedure of the voice coder, and because the bearer of the interface with MGW1 is TDM bearer, it performs ISLP adaptation, and Send the adapted voice media to MGW1;

[0078] According to the incoming call is TDM transmission, MGW1 finds that the media is ISLP-adapted voice by detecting the ISLP special flag, then it does not perform encoding and decoding, and sets the X flag position of the RTP header to 1, and at the same time uses a special field (such as 0xA002) in the RTP extension header to indicate that it has Voice media stream adapted by ISLP, and encapsulate the media stream in RTP to send out.

[0079] MGW2's incoming call is IP media be...

Embodiment 2

[0081] Embodiment 2: It is assumed that the BSS and the MGW are transmitted through IP, and the scene between the MGW and the MGW is TDM transmission. Refer to Figure 5 shown.

[0082] After BSS1 receives the instruction message that the communication terminal switches from ordinary voice communication to voice transparent transmission communication, it stops the codec processing procedure of the vocoder for voice, and since the bearer of the interface with MGW1 is an IP bearer, the voice code stream is encapsulated in Send it to MGW1 in RTP, and at the same time set the X flag position of the RTP header to 1, and use a special field (such as 0xA001) in the RTP extension header to indicate that the media stream carried by RTP is a voice media stream that has not undergone ISLP adaptation.

[0083] According to the fact that the incoming call is IP media bearer and the outgoing call is TDM media bearer, MGW1 detects the incoming RTP extension header and finds that the RTP exte...

Embodiment 3

[0086] Embodiment 3: It is assumed that IP transmission is used between BSS and MGW, and between MGW and MGW, refer to Image 6 shown.

[0087] After BSS1 receives the instruction message from the communication terminal to switch from ordinary voice communication to voice transparent transmission communication, it stops the codec processing procedure of the vocoder for voice, and because the bearer of the interface with MGW1 is IP bearer, the voice code stream is encapsulated in RTP Send it to MGW1, and set the X flag in the RTP header to 1, and use a special field (such as 0xA001) in the RTP extension header to indicate that the carried media stream is a voice code stream that has not undergone ISLP adaptation.

[0088] Since the incoming and outgoing calls of MGW1 are carried by IP media, MGW1 detects the RTP extension header and finds that the RTP extension header is a special field (such as 0xA001) that indicates that it has not been adapted by ISLP, so that the media stre...

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Abstract

The invention discloses a method and a system for realizing the transparent transmission of the speech in the network. BSS at the home end receives a switching command of the speech transparent transmission service, and a core network media processing node determines the load manner of the interface between the processing node and the BSS; if the load manner is TDM, the ISLP adaptation is carriedout to the transparent transmission speech stream and the formed media stream is transmitted; if the load manner is IP-load, the speech stream to be transparently transmitted is packaged into an RTP bag in a message manner and the special field is filled in the RTP extension header and the formed media stream is transmitted. The media load manner of the core network media processing node determines the incoming and outcoming load manners of the media stream, and detects ISLP special mark or the RTP-header special extended field, if detected, determining whether the media adaptation is required; and if not required, the media stream is transmitted from the incoming local; if required, the media stream is transmitted without coding and decoding transformation through adaptation. BBS at the opposite end receives the media stream, and processing according to the interface media load manner of the core network.

Description

technical field [0001] The invention relates to the technical field of mobile communication, in particular to a method and system for realizing voice transparent transmission in a mobile network. Background technique [0002] In the traditional CDMA (Code Division Multiple Access) mobile communication network, the core network adopts circuit switching technology based on TDM (Time Division Multiplexing). The current CDMA network architecture is as follows: figure 1 As shown, in a voice call, when all voice data passes through a BSS (Base Station System, base station subsystem), it needs to pass through a vocoder for voice codec conversion. When the communication terminals use 8K EVRC (Enhanced Variable Rate Coding) voice coding, the BSS needs to convert the voice from 8K rate EVRC coding to 64K rate PCM coding, or from 64K PCM to 8K EVRC coding (If other voice codes used by the mobile phone, conversion from other voice codes to PCM codes is required). The disadvantage of t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04W92/10H04W92/16H04L29/06
Inventor 林奕琳李宝荣杨维忠孙宇张琳峰龙彪林衡华肖海
Owner CHINA TELECOM CORP LTD