Base Station MCS Selection Using CQI Compensation
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Solution Overview
Problem
In wireless communication systems, the modulation and coding scheme (MCS) level is often improperly adjusted based on signal-to-interference plus noise ratio (SINR), leading to reduced throughput in low SINR areas or failure to increase MCS in high SINR areas, thus affecting data transmission efficiency.
Innovation Solution
A method and apparatus for determining MCS by obtaining channel information from user equipment (UE), calculating compensation parameters and offset values based on this information to dynamically adjust the MCS level, ensuring optimal data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If MCS level is adjusted based on SINR, then transmission reliability is improved, but throughput is reduced in low SINR areas
Solution Approach 1:
The patent changes the parameter used for MCS selection from SINR to CQI. CQI is specifically designed to reflect channel quality in a way that better correlates with achievable throughput. By using CQI instead of SINR, the system achieves more accurate MCS selection that maintains reliability while improving throughput, especially in low SINR conditions where the traditional SINR-based approach overly conservatively limits the MCS level.
2Productivity
If MCS level is increased in high SINR areas, then throughput is improved, but transmission reliability deteriorates
Solution Approach 1:
The patent implements feedback mechanisms where the UE reports CQI measurements to the base station, and the base station adjusts MCS based on this feedback. The CQI feedback loop allows the system to accurately assess channel conditions and select appropriate MCS levels. This feedback-driven approach prevents premature MCS increases in high SINR areas while enabling timely MCS increases when channel conditions truly support higher rates, thus maintaining both reliability and throughput.
3Reliability
If conservative MCS selection is used, then transmission reliability is improved, but data transmission efficiency is reduced
Solution Approach 1:
The patent changes the fundamental parameter for MCS selection from SINR to CQI. CQI (Channel Quality Indicator) is specifically designed to represent channel quality in terms that directly correlate with achievable data rates and transmission efficiency. This parameter change eliminates the conservatism inherent in SINR-based selection, allowing the system to achieve higher data transmission efficiency while maintaining reliability through CQI's more accurate reflection of actual channel capabilities.
Data Source
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AI summary
The present disclosure relates to a 5G or 6G communication system for supporting a higher data transmission rate. A method performed by a base station in a wireless communication system may comprise the operations of: obtaining, from a UE, first channel information indicating a channel state between the base station and the UE; determining a first compensation parameter value on the basis of a first parameter value associated with the channel state, which has been determined on the basis of the first channel information indicating the channel state, and a first offset value for compensation of the first parameter value associated with the channel state; and on the basis of the first compensation parameter value, determining, as a first modulation and coding scheme (MCS) level, an MCS level applied to the UE.