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Method for implement secondary coding-decoding operation service at cross-packet network and media gateway

A media gateway and packet network technology, applied in voice analysis, data exchange network, network traffic/resource management, etc., can solve the problem of affecting the probability of successful TFO signaling negotiation, increasing the cost and complexity of the gateway, and poor quality of IP network service issues such as improving negotiation success rate, avoiding low voice quality, and reducing cost and complexity

Active Publication Date: 2006-11-29
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0034] (2) It is required that the MGW must support codec conversion. In the non-TFO state (that is, before the TFO negotiation succeeds or when the TFO negotiation fails), the MGW is required to perform the codec conversion between the PCM code stream and the compressed voice codec. On the one hand, MGW needs to support many codec algorithms, which increases the cost and complexity of the gateway. On the other hand, codec conversion will cause voice quality to decrease
[0039] (2) Due to the poor service quality of the IP network, packet loss and bit errors will occur, which will affect the probability of successful TFO signaling negotiation

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  • Method for implement secondary coding-decoding operation service at cross-packet network and media gateway
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  • Method for implement secondary coding-decoding operation service at cross-packet network and media gateway

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Embodiment Construction

[0084] The solution of the present invention will be further described below with reference to the specific embodiments of the accompanying drawings.

[0085] The core solution of the present invention is: a method for implementing TFO service without secondary encoding and decoding across packet networks. The TFO signaling is transparently transmitted to the opposite end of the packet network for TFO negotiation; if the TFO negotiation is successful, the compressed voice codec is used to extract the compressed voice frame from the forwarded data and transmit it on the packet network.

[0086]Aiming at the above core solution, the present invention proposes a media gateway at the edge of the packet network, which can realize TFO services across the packet network. In this document, the end-to-end TFO service across the packet network of the TDM network is taken as an example for illustration. In particular, the TFO service of calling across the IP core network from GSM to GSM...

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Abstract

This invention discloses a method for realizing operation of TFO service exempting secondary code-decode of a bridge packet network and a media gateway, in which, the media gateway includes a code-decode unit of the non-TFO state, a TFO signaling test and judgment unit, a TFO transmission unit and a compressed phonetic code-decode unit, when the media gateway loads and transmits the bridge packet net data, if the transmitted data carries with the TFO signaling, which will be transmitted to the opposite end of the packet net for TFO negotiation, if it is successful, then the compressed phonetic code-decode agreed by the two parties are applied to pick up compressed phonetic frames from the forwarded data to be transmitted on the packet network.

Description

technical field [0001] The invention relates to Tandem Free Operation (TFO, Tandem FreeOperation) technology in a communication system, in particular to a method and a media gateway for realizing Tandem Free Operation services across a packet network. Background technique [0002] TFO technology is to solve the problem of voice quality damage caused by codec conversion when wireless compressed voice is transmitted on a Time Division Multiplex (TDM, Time Division Multiplex) communication system. TFO technology refers to the transmission of pure pulse code modulation (PCM, Pulse Code Modulation) code stream in the high bit of each sample carried by TDM through in-band signaling negotiation, and the transmission of TFO signaling and compressed voice frames in the low bit to achieve the following advantages: [0003] (1) Improve voice quality: because it can reduce two voice codec conversions. [0004] (2) Improve the processing capability of the digital signal processor (DSP):...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04Q7/30H04L12/56H04W28/06G10L19/00H04L12/70H04W28/18
Inventor 吴东君张宝峰施有铸刘振华陈诚
Owner HUAWEI TECH CO LTD