CQI and MCS Parameter Table Segmentation for Wireless Systems
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Solution Overview
Problem
The existing parameter tables in 3GPP Rel. 8/9/10 systems, such as CQI, MCS, and differential CQI tables, are limited in supporting higher modulation orders and coding rates, which restricts spectral efficiency and user throughput.
Innovation Solution
The proposed solution involves configuring parameter tables at both the base station and user equipment to include legacy and extended entries, with the base station transmitting a bitmap indication to select a sub-table or indicate a parameter table, ensuring backward compatibility by maintaining the same number of entries as legacy tables.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the parameter table includes only legacy entries, then backward compatibility is maintained, but support for higher modulation orders and coding rates is limited
Solution Approach 1:
The parameter table is segmented into multiple sub-tables (first sub-table with legacy entries, second sub-table with extended entries for higher modulation orders). A selection indicator is used to choose which sub-table is active, allowing the system to maintain backward compatibility while supporting higher modulation orders when needed.
Solution Approach 2:
The system dynamically switches between different sub-tables based on the selected modulation order. The parameter table configuration changes from static to dynamic, allowing flexible adaptation between legacy and extended entries depending on the communication scenario and required spectral efficiency.
2Productivity
If the parameter table is extended with more entries, then spectral efficiency is improved, but signaling overhead increases
Solution Approach 1:
The extended parameter table is segmented into multiple sub-tables with different numbers of entries. The selection indicator allows the system to activate only the necessary sub-table, avoiding the need to signal all possible entries while still providing the option for extended spectral efficiency when needed.
Solution Approach 2:
Different sub-tables have different local qualities (number of entries, modulation order support). The system selects the appropriate sub-table quality based on local communication conditions, using more detailed extended entries only when high spectral efficiency is required, rather than always signaling the full extended table.
3Adaptability or versatility
If the number of parameter table entries is increased, then more modulation and coding combinations are available, but the table size exceeds legacy table size
Solution Approach 1:
The parameter table is divided into multiple sub-tables with different sizes. The first sub-table matches the legacy table size for backward compatibility, while the second sub-table contains additional entries for higher modulation orders. The selection indicator enables switching between sub-tables of different quantities.
Solution Approach 2:
The table size becomes dynamic rather than fixed. The system can dynamically select between a smaller first sub-table (for legacy compatibility) and a larger second sub-table (for extended modulation support), allowing flexible adaptation to different communication scenarios.
Data Source
AI summary
The present disclosure provides a communication method, base station and user equipment for configuring a parameter table in a wireless communication system including a base station and a user equipment, the communication method comprising: defining at both the base station and the user equipment a parameter table which includes whole entries of a legacy parameter table and extended entries; and transmitting from the base station to the user equipment a bitmap indication which indicates a sub-table selected from the parameter table, wherein the number of the entries in the sub-table is the same as in the legacy parameter table.