256QAM CQI Index Table Configuration for Wireless Data Transmission
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently processing high data traffic and increasing data speeds, particularly with the demand for new modulation methods beyond QPSK, 16QAM, and 64QAM, due to limited channel state information feedback capabilities.
Innovation Solution
The introduction of a 256QAM modulation method, which requires a newly configured CQI index table to support enhanced data transmission efficiency, allowing User Equipment (UE) to select and transmit CQI index values based on channel quality measurements to the base station, enabling improved data processing and transmission speeds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If 256QAM modulation method is introduced to support high data traffic and speed, then data transmission efficiency is improved, but CQI feedback information size increases
Solution Approach 1:
The patent changes the parameter of CQI index table configuration by introducing a new entry for 256QAM modulation. The CQI feedback information size is maintained at 4 bits by simply adding a new index value (e.g., 15) to the existing table of 16 entries, rather than increasing the feedback bit width. This allows the system to support 256QAM while keeping the feedback overhead unchanged.
2Adaptability or versatility
If CQI index table is extended to include 256QAM, then modulation capability is improved, but device complexity increases
Solution Approach 1:
The patent applies universality by making the CQI index table multi-functional. The same 4-bit CQI feedback mechanism that previously supported only QPSK, 16QAM, and 64QAM is extended to also support 256QAM by simply adding new index entries to the existing table structure. This allows one feedback mechanism to serve multiple modulation schemes without requiring separate feedback channels or increased complexity.
Data Source
AI summary
The present disclosure relates to an apparatus and a method for transmitting and receiving channel state information of a User Equipment that supports 256-state quadrature amplitude modulation (256QAM). The method may include: receiving a reference signal for measuring channel quality from a base station; measuring the channel quality based on the reference signal, and selecting a CQI index value from a predetermined CQI index table including CQI index values for 256QAM modulation, based on the measurement result of the channel quality; and transmitting channel state information including the selected CQI index value to the base station.