Method for restoring time alignment note, signal source decoding method, apparatus and system

A technology for aligning flags and recovery time, applied in the communication, transmission system, electrical components and other directions between multiple stations, can solve problems such as reducing MGW, and achieve the effect of reducing voice damage and improving call quality

Inactive Publication Date: 2013-01-23
HUAWEI TECH CO LTD
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Problems solved by technology

[0011] However, according to the current standard RTP protocol, the TAF value is not sent from the base station to the media gateway for source decoding. Without a TAF value, the voice decoding process for the mute indication frame will be affected, reducing the MGW (MEDIA GATEWAY, media Gateway) call quality after voice decoding

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  • Method for restoring time alignment note, signal source decoding method, apparatus and system
  • Method for restoring time alignment note, signal source decoding method, apparatus and system
  • Method for restoring time alignment note, signal source decoding method, apparatus and system

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Embodiment Construction

[0054] The specific implementation manners of the embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0055] In each embodiment of the present invention and in each part of the description of this application, the service frame includes an SP frame and a SID frame, the SP frame is a voice frame, the SID frame is a mute indication frame, and the TAF is a time alignment flag. Some flags are 1 and some are 0. The use of Chinese or English abbreviations in different places is required for the convenience of reference and expression.

[0056] As shown in Fig. 2, it is a schematic diagram of data flow from the mobile station to the media gateway via the base station subsystem. According to the 3GPP (Three Generation Partnership Project, third-generation mobile communication cooperation project) 46.031 protocol, when the uplink discontinuous transmission mode is enabled, the mobile station can generate conti...

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Abstract

A method for time alignment flag resumption includes the steps: acquiring the data frame from the RTP voice package; if the current frame type is determined to be a silence descriptor frame, and the frame type before the silence descriptor frame is the speech frame in the predetermined time segment, then the time alignment flag of the silence descriptor frame is set to the first value; if the current frame type is determined to be the silence descriptor frame, and the data frame before the silence descriptor is not received in the predetermined time segment, then the time alignment flag of the silence descriptor frame is set to the second value. Methods for simplifying time alignment flag resumption, for simplifying information source decoding, and for information source decoding are also disclosed. A media gateway and system that apply to information source decoding are provided. Use of the invention enables resumption of the time alignment flag in RTP and applies this to information source decoding.

Description

technical field [0001] The invention relates to the technical field of mobile communication, in particular to a method for recovering a time alignment mark, a method, a device and a system for information source decoding. Background technique [0002] After the A interface (Ainterface) of GSM (Global System for Mobile Communications, Global System for Mobile Communications) becomes IP (Internet Protocol, Internet Protocol), BSC (base station controller, base station controller) can directly perform IP encapsulation and sent to the core network. The core network is responsible for handling all multi-codec-related affairs, including codec negotiation and codec conversion after negotiation failure, and completing the exchange of voice packets. This solution can make full use of the characteristics of the softswitch core network. By supporting TrFO (Transcoder Free Operation, free code conversion operation), it can improve voice quality, reduce the use of TC (Transcoder, code c...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B7/26H04L29/06
CPCH04L29/0651H04L65/607H04L65/70
Inventor 郭江李明李国宏
Owner HUAWEI TECH CO LTD
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