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Improvements in or relating to codec negotiation and selection

一种编解码器、无编码的技术，应用在无线电接入网领域，能够解决失败等问题，达到防止过度供应的效果

Inactive Publication Date: 2010-09-01
TELEFON AB LM ERICSSON (PUBL)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] OoBTC mid-call modification or negotiation process can be rejected by the terminating side, resulting in unnecessary use of signaling resources
[0015] The OoBTC mid-call modification or negotiation process may fail completely in a mixed provider or mixed configuration environment

Method used

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  • Improvements in or relating to codec negotiation and selection
  • Improvements in or relating to codec negotiation and selection
  • Improvements in or relating to codec negotiation and selection

Examples

Experimental program
Comparison scheme
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Embodiment Construction

[0039] figure 1 The call setup procedure for a GSM mobile originated call for a call without transcoding operation is shown. figure 1 Mobile station 100 is shown in communication with a mobile switching center (MSC) server module (MSC-S) in MSC 102 (not shown itself). The MSC is in communication with the media gateway module 104 and the base station system module (BSS) 106 . The BSS includes a base station controller node or module (BSC) 108 and a transcoding unit (TRAU) 110 . A call originates from a mobile station (MS) 100, which may also be referred to as a GSM terminal. A GSM terminal communicates with its associated MSC-S through the BSS and BSC. The originating GSM terminal indicates the supported codec type (oMS-SCL: originating mobile station supported codec list) to the MSC-S in the message. exist figure 1 Within the schematic, dashed lines show some of the physical connections between the various modules. It will be recognized that there may be more physical co...

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PUM

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Abstract

A method of modifying a call set up message for a call from a first terminal to a second terminal, the call set up message being sent from the first terminal (Mobile Station, MS) to a network node (e.g. MSC server, MSC-S) via an intermediate node (e.g. BSC or RNC) which handles at least some signaling or traffic associated with the call, wherein the network node is responsible for negotiating call set up requirements, the method comprising the steps of : intercepting the call set up message at the intermediate node (indicating codec list); identifying one or more codec preferences and capabilities associated with the intermediate node; modifying (e.g. by appending, removing, deleting, inserting or reordering the list) the call set up message based on information relating to said preferences or capabilities; and sending the modified call set up message to the network node.

Description

technical field [0001] The present invention relates to improvements in or relating to codec negotiation and selection, particularly but not exclusively in radio access networks. Background technique [0002] For both Codec Free Operation (TFO) and Out-of-Band Transcoder Control (OoBTC), there are ongoing efforts to avoid speech quality impairments caused by unnecessary transcoding steps along the speech path. To achieve this, both techniques rely on the exchange of lists of codec types to be used on each sub-link of the voice path. Codec-Free Operation (TFO) is an in-band process used to deliver compressed speech over a Pulse Code Modulation (PCM) connection. TFO is applied after call establishment, which includes exchanging codec information between TFO peers using an in-band protocol. The optimal common codec is determined according to a predetermined set of rules. Out-of-band transcoder control (OoBTC) is a process between call control nodes (CCNs) in which codecs are...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W28/18
CPCH04W76/02H04W88/181H04W28/18H04L65/1069H04W76/10
Inventor D·卡姆普曼K·赫尔维格H·布尔
Owner TELEFON AB LM ERICSSON (PUBL)
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