Dynamic CQI Table Selection for 1024QAM Modulation
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Solution Overview
Problem
Current communication systems face challenges in achieving high-speed data transmission for applications like video streaming and gaming, as they lack flexibility in selecting modulation schemes based on channel conditions, relying on limited CQI and MCS tables.
Innovation Solution
A base station and terminal apparatus communication method that dynamically switches between multiple CQI tables and MCS tables, allowing for the selection of modulation schemes such as QPSK, 16QAM, 64QAM, 256QAM, and 1024QAM based on CSI reports and configuration information, enabling flexible adaptation to channel conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If multiple CQI tables and MCS tables are introduced to support higher order modulation schemes (256QAM, 1024QAM), then data transmission speed is improved, but system complexity increases
Solution Approach 1:
The patent segments the CQI and MCS tables into multiple versions (first CQI table with QPSK/16QAM/64QAM, second CQI table with QPSK/16QAM/64QAM/256QAM, third CQI table with QPSK/16QAM/64QAM/256QAM/1024QAM). Each table is configured for specific modulation schemes, allowing the system to select appropriate tables based on channel conditions and terminal capabilities, thereby enabling high-speed transmission without permanently increasing system complexity.
Solution Approach 2:
The patent implements dynamic selection of CQI tables and MCS tables based on channel conditions and terminal capabilities. The base station configures appropriate tables via RRC signaling and dynamically selects which table to use for CQI interpretation, allowing the system to adapt between different modulation schemes (64QAM, 256QAM, 1024QAM) as conditions change, optimizing speed while managing complexity.
2Adaptability or versatility
If CQI table selection information is transmitted to enable flexible modulation scheme selection, then adaptability is improved, but information overhead increases
Solution Approach 1:
The patent makes the existing CQI table selection mechanism multi-functional by enabling it to select from multiple CQI table versions (first, second, third tables) corresponding to different modulation capabilities. The same CQI table selection information structure is reused to indicate which CQI table version to apply, allowing a single mechanism to serve multiple adaptation purposes without adding separate signaling for each modulation scheme.
Solution Approach 2:
The patent changes the interpretation parameters of existing CQI tables by introducing version indicators (first, second, third CQI tables) that map to different modulation scheme sets. By modifying which table is selected rather than changing the table structure itself, the system achieves adaptability while minimizing information overhead - the selection information points to pre-configured tables with different parameter sets.
Data Source
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AI summary
In a case that a CQI table applied to interpret a CSI report is changed from a first CQI table including modulation schemes up to 64QAM to a second CQI table including modulation schemes up to 256QAM, information on a CQI table selection indicating applicability of the second CQI table and a CSI subframe set indicating subframes for which a CQI table selected in the CQI table is used are transmitted. In a case that the CQI table applied to interpret the CSI report is changed from the second CQI table to a third CQI table including modulation schemes up to 1024QAM, only the information on the CQI table selection indicating applicability of the third CQI table is transmitted.