Representative MS Grouping for CQI Feedback Overhead Reduction
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Solution Overview
Problem
In communication systems, the overhead and power consumption associated with Channel Quality Information (CQI) feedback increase with the number of Mobile Stations (MSs) serviced, necessitating a reduction in CQI feedback overhead and power consumption.
Innovation Solution
Grouping MSs with similar channel statuses into the same group, where a representative MS transmits an average CQI to the Base Station (BS) on behalf of the group, reducing the need for individual MSs to feedback their CQIs and allowing the BS to determine Modulation and Coding Scheme (MCS) levels based on the group's average CQI.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If individual MSs transmit their own CQIs, then the BS can determine accurate MCS levels for each MS, but the CQI feedback overhead and power consumption increase with the number of MSs
Solution Approach 1:
Multiple MSs are grouped together based on similar channel characteristics, and one representative MS transmits the CQI on behalf of the entire group. This merging approach reduces the number of CQI transmissions from N individual MSs to 1 representative transmission, directly reducing feedback overhead while maintaining adequate channel quality information for MCS determination
Solution Approach 2:
The representative MS's CQI is used as a copy or proxy for the channel quality information of other MSs in the same group. Instead of requiring each MS to transmit its own CQI, the system uses the representative MS's measurement as a substitute that reflects the channel conditions for the entire group, reducing overhead while preserving essential information
2Measurement precision
If individual MSs feedback their CQIs, then the BS can determine MCS levels for each MS, but the power consumption of MSs increases due to inevitable feedback operations
Solution Approach 1:
Multiple MSs combine their channel quality information through grouping, where only one representative MS performs the power-consuming CQI feedback operation. The other MSs in the group save power by not transmitting their own CQIs, as their channel conditions are represented by the representative MS's measurement
Solution Approach 2:
The representative MS's CQI transmission serves multiple functions simultaneously: it provides channel quality information for the representative MS itself and also serves as the CQI for all other MSs in the group. This multi-functionality reduces the total number of feedback operations required across the system, thereby reducing overall power consumption
Data Source
AI summary
An apparatus and method for transmitting/receiving a Channel Quality Information (CQI) in a communication system are provided. A Mobile Station (MS) receives first information indicating a representative MS selected from a group of MSs located within a preset range and in similar channel statuses, the group including the MS, determines from the first information whether the MS is designated as the representative MS, and transmits a CQI of the MS as a representative CQI of the MSs included in the group to a Base Station (BS), if the MS is designated as the representative MS.