EGPRS Channel Quality Reporting in RTTI Configurations
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Solution Overview
Problem
The existing EGPRS system lacks a method for accurately reporting channel quality in reduced transmission time interval (RTTI) configurations, which hampers efficient link adaptation and data throughput in varying channel conditions.
Innovation Solution
A method for a mobile station to report channel quality in RTTI configurations, similar to conventional basic transmission time interval (BTTI) configurations, by measuring and averaging bit error probabilities (BEP) and coefficients of variation across bursts, allowing for reliable channel quality parameter calculation and reporting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If RTTI configuration is used to reduce transmission time, then transmission speed is improved, but channel quality measurement accuracy deteriorates due to lack of established measurement schemes
Solution Approach 1:
The patent applies universality by extending the BTTI channel quality measurement scheme to RTTI configuration. The same measurement parameters (BEP, CV_BEP), calculation methods, and reporting procedures are used in both BTTI and RTTI configurations, allowing the measurement system to function universally across different transmission time interval modes without requiring separate measurement schemes
Solution Approach 2:
The patent applies preliminary action by establishing the channel quality measurement framework before RTTI deployment. The measurement scheme pre-defines how BEP is measured, how CV_BEP is calculated, and how channel quality is reported in RTTI configuration, ensuring measurement accuracy is prepared in advance rather than developed reactively when measurement problems arise
2Reliability
If channel quality is reported more frequently to improve link adaptation, then link adaptation performance is improved, but signaling overhead increases
Solution Approach 1:
The patent applies parameter changes by introducing CV_BEP (coefficient of variation of bit error probability) as an additional measurement parameter alongside BEP. This change allows the system to capture channel quality variations more effectively, enabling more reliable link adaptation decisions without requiring excessive signaling, as both parameters can be efficiently packed and reported together in the channel quality report
Data Source
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AI summary
To report channel quality in RTTI configuration, channel quality parameters for at least one radio block intended for the MS is calculated over a filtering period. A filtering period is two times longer than the time needed to transmit the radio block.