Transcoder Controller for Voice Bearer Format Selection
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Solution Overview
Problem
In cellular communication systems, particularly in CDMA networks, the relocation of transcoders closer to the PSTN and the coexistence of circuit switched and packet switched core networks lead to multiple transcoding functions along a voice signal's path, causing ambiguity about where and how transcoding should be performed.
Innovation Solution
A wireless communication system with a transcoder controller that determines the appropriate transcoder location and type by analyzing the bearer format types supported by network elements and mobile stations, selecting one transcoder to transcode voice based on these formats to minimize transcoding functions and optimize network performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If transcoders are relocated closer to the PSTN in a cdma2000 network, then system costs are reduced and voice services can be transported in compressed format over the backhaul network, but multiple transcoding functions may reside along the voice signal path causing ambiguity about which transcoder should encode/decode the voice
Solution Approach 1:
The patent introduces a transcoder controller as an intermediary component that manages and coordinates multiple transcoders distributed along the voice signal path. This controller receives voice packets and determines which downstream transcoder should perform the transcoding operation, thereby resolving the ambiguity caused by having multiple transcoding functions in the network while maintaining the cost benefits of compressed voice transport.
2Adaptability or versatility
If transcoders are distributed in the RAN as in legacy CDMA systems, then voice packets can be efficiently converted to PCM signals for circuit switched network transmission, but relocating transcoders to a centralized location deeper in the network is needed to reduce system costs and enable compressed format transport over packet switched networks
Solution Approach 1:
The patent implements a dynamic transcoder selection mechanism where the transcoder controller can adaptively choose which downstream transcoder will perform the transcoding operation based on network conditions, mobile station capabilities, and bearer format requirements. This dynamic approach allows the system to maintain flexibility in network architecture while optimizing for cost efficiency by enabling compressed format transport over packet switched networks.
3Adaptability or versatility
If multiple transcoding functions are provided in both core network and RAN during system upgrade, then compatibility with both legacy and next generation networks is maintained, but it creates ambiguity about which transcoder should be selected to perform the actual transcoding
Solution Approach 1:
The patent implements a feedback mechanism where the transcoder controller receives information about mobile station capabilities, supported bearer formats, and network conditions, then uses this feedback to determine the optimal downstream transcoder for performing the transcoding operation. This feedback loop resolves the ambiguity of transcoder selection while maintaining compatibility with both legacy CDMA systems and next generation cdma2000 networks.
Data Source
AI summary
A wireless communication system comprises an infrastructure that includes a first network element that is upstream of a second network element, wherein the first network element comprises a first transcoder and the second network element comprises a second transcoder. The communication system controls a transcoding of voice by determining a first bearer type supported by the first transcoder, determining a second bearer format type mutually supported by the infrastructure and a mobile station serviced by the infrastructure, and selecting one of the first transcoder and the second transcoder to transcode the voice based on the first bearer format type and the second bearer format type.