Reverse Link CQI Reporting Mode Selection in Wireless Systems
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Wireless communication systems face challenges in maintaining older network systems to fully exploit new device capabilities, particularly in efficiently managing reverse link CQI reporting modes, which affects system throughput and resource allocation.
Innovation Solution
A method and apparatus for determining and setting the CQIReportingMode in access terminals, allowing for different reporting modes such as Single Code Word, Multiple Code Word, or SISO, to optimize reverse link communication, reducing signaling overhead and improving system efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple CQI reporting modes are supported to exploit new device capabilities, then device adaptability and system throughput are improved, but network system complexity and difficulty of maintaining older systems increase
Solution Approach 1:
The patent implements dynamic CQI reporting mode selection where the network can switch between different reporting modes (e.g., wideband CQI, subband CQI, differential CQI) based on current channel conditions and device capabilities. This dynamic adaptation allows the system to exploit advanced device features when available while maintaining backward compatibility with older devices and network configurations, thereby improving adaptability without permanently increasing system complexity.
Solution Approach 2:
The patent changes the parameter of CQI reporting granularity and frequency based on channel conditions and device capability indicators. By adjusting reporting parameters such as the resolution of CQI measurements, the frequency of reports, and the differential encoding schemes, the system can optimize performance for advanced devices while using simpler parameter sets for legacy devices, thus resolving the contradiction between adaptability and complexity.
2Productivity
If CQI reporting frequency and granularity are increased to improve throughput, then system throughput and resource allocation efficiency are improved, but signaling overhead increases
Solution Approach 1:
The patent dynamically adjusts CQI reporting parameters including reporting frequency, granularity (wideband vs. subband), and differential encoding based on channel conditions and device capabilities. When channel conditions are stable, the system reduces reporting frequency and granularity to minimize overhead. When conditions change rapidly or device capabilities are advanced, the system increases reporting detail to maintain high throughput, thus optimizing the trade-off between productivity and information loss.
Solution Approach 2:
The patent implements partial CQI reporting where only the most relevant frequency subbands or time resources are reported in detail, rather than reporting all resources at maximum granularity. This partial action approach maintains sufficient throughput by focusing reporting effort on critical resources while reducing overall signaling overhead by omitting or coarsely reporting less critical information.
3Loss of information
If differential CQI reporting is used to reduce overhead, then signaling overhead is reduced, but measurement and reporting precision requirements increase
Solution Approach 1:
The patent adjusts the differential CQI reporting parameters such as the reference CQI value selection, differential quantization resolution, and reporting granularity based on channel conditions and device capabilities. By dynamically changing these parameters, the system can maintain adequate measurement precision when differential reporting is used, while still achieving overhead reduction compared to absolute CQI reporting for all resources.
Data Source
AI summary
A method and apparatus for setting Reverse Link CQI Reporting Modes in an access terminal is provided, comprising determining a value for CQIReportingMode received as a parameter in a transmitted message and setting the reverse link CQI reporting mode of the access terminal based on CQIReportingMode value. The CQIReportingMode value is indicative of a reporting mode selected from a plurality of reporting modes.