Uplink Control Information Transmission Optimization
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently transmitting uplink control information (UCI) due to limitations in frame structures and channel allocation, which affect the overall performance and user experience.
Innovation Solution
The method involves determining the content for uplink control information (UCI) based on a portion of a subframe and transmitting it within that portion, incorporating channel quality indicators (CQI) that include correlation or whitening matrices, and optimizing ACK/NACK transmissions to reduce payload size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If uplink control information is transmitted using traditional frame structures with separate PUCCH and PUSCH channels, then channel allocation is simplified, but transmission efficiency and overall system performance deteriorate
Solution Approach 1:
The patent combines PUCCH and PUSCH transmissions into a single uplink message structure, allowing control information and data to be transmitted together in the same time-frequency resources. This merging eliminates the need for separate channel allocations and improves transmission efficiency by utilizing resources more effectively.
Solution Approach 2:
The uplink message structure is designed to serve multiple functions simultaneously - it can carry control information (UCI), data payloads, and channel quality indicators (CQI) all in one transmission. This multi-functional approach replaces the traditional separate PUCCH and PUSCH channels, simplifying the frame structure while maintaining versatility.
2Measurement precision
If full CQI matrices are transmitted, then channel quality feedback precision is improved, but payload size and transmission overhead increase
Solution Approach 1:
The patent extracts and transmits only the essential components of the CQI matrix - specifically the correlation matrix or whitening matrix - rather than transmitting the complete CQI information. This extraction approach maintains sufficient channel quality feedback precision while significantly reducing the payload size and transmission overhead.
Solution Approach 2:
Instead of transmitting uniform full-resolution CQI data across all dimensions, the patent applies local quality optimization by transmitting reduced-rank representations (correlation/whitening matrices) that capture the most critical channel characteristics. This provides locally optimized feedback quality where it matters most while reducing overall data volume.
3Measurement precision
If ACK/NACK information is transmitted with full detail for each code block, then acknowledgment precision is improved, but control information payload size increases
Solution Approach 1:
The patent extracts the essential acknowledgment status from detailed per-code-block feedback and transmits only the critical ACK/NACK indicators needed for retransmission decisions. This extraction maintains sufficient acknowledgment precision for reliable communication while minimizing the payload size of control information.
Data Source
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AI summary
Various additional and alternative aspects are described herein. In some aspects, the present disclosure provides a method for wireless communication. The method includes determining content to include in an uplink control information (UCI) based on a portion of a subframe that includes the UCI. The method further includes transmitting the UCI in the portion of the subframe.