Link Quality Reporting for EGPRS2 Modulation Schemes
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Solution Overview
Problem
In EGPRS2, the increased number of modulation schemes in EGPRS2-A and EGPRS2-B necessitates efficient reporting of link quality information to the network without exceeding uplink resources, as existing methods are inadequate in selectively reporting relevant modulation schemes, leading to suboptimal throughput and potential RLC stalls.
Innovation Solution
A method for prioritizing and selectively reporting link quality information based on the priority of each modulation scheme, considering link quality parameters, preference parameters, and usage scenarios, such as compatibility and retransmissions, to optimize the reporting process and reduce the number of bits required for signaling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If all received modulation schemes are reported to the network, then complete link quality information is provided, but uplink resources are exhausted and message space is insufficient
Solution Approach 1:
The patent extracts only the essential link quality information from the complete set of received modulation schemes. Instead of reporting all modulation schemes, the system identifies and reports only the most relevant ones (typically the best and second best modulation schemes) based on link quality parameters, thereby reducing uplink resource consumption while maintaining useful information for link adaptation.
Solution Approach 2:
The patent applies partial action by reporting only a subset of modulation schemes rather than all received schemes. The system selectively reports link quality information for the top N modulation schemes (where N < total number of received schemes), which is sufficient for effective link adaptation without exhausting uplink resources.
2Measurement precision
If more modulation schemes are reported, then link adaptation accuracy improves, but the number of bits required for signaling increases
Solution Approach 1:
The patent extracts only the necessary link quality parameters for the selected modulation schemes. Instead of reporting all modulation schemes with their full parameter sets, the system extracts and reports only the essential parameters (such as BEP and CV_BEP) for the top N schemes, reducing the total number of bits required for signaling while maintaining adequate precision for link adaptation.
3Adaptability or versatility
If channel quality reports are expanded to cover more modulation schemes, then link adaptation capability is enhanced, but RLC stall risk increases due to limited uplink resources
Solution Approach 1:
The patent extracts only the most critical link quality information needed for effective link adaptation. By selecting and reporting only the top N modulation schemes with the highest link quality parameters, the system maintains sufficient adaptability for network optimization while preserving uplink resources for other critical functions like ACK/NACK signaling, thereby reducing RLC stall risk.
Solution Approach 2:
The patent applies partial action by providing link adaptation information for only the essential modulation schemes rather than all received schemes. This partial reporting approach maintains adequate link adaptation capability for the most relevant scenarios while ensuring sufficient uplink resources remain available for acknowledgment signaling and other time-critical operations.
Data Source
AI summary
It is described a method for reporting, in a link quality report, link quality information from a link quality report sending station to a link quality report receiving station. The link quality report receiving station is capable of using different modulation schemes for communicating to the link quality report sending station. Depending on a priority of each of at least two of said different modulation schemes, at least one of said at least two modulation schemes are selected for inclusion of corresponding link quality information in said link quality report. According to an embodiment, the priority of each of said at least two modulation schemes is determined depending on a link quality parameter value.