HARQ-ACK Codebook Pruning for Multi-PDSCH Scheduling
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Solution Overview
Problem
Current wireless communication systems face inefficiencies in signal transmission and reception, particularly in handling multiple physical downlink shared channels (PDSCHs) and hybrid automatic repeat request (HARQ) acknowledgments, which affect the overall performance and reliability of wireless communication.
Innovation Solution
A method and apparatus for efficiently receiving and transmitting wireless signals by scheduling PDSCHs, determining HARQ-ACKs based on specific codebook configurations, and performing start and length indicator value (SLIV) pruning to optimize HARQ-ACK feedback timing, allowing for efficient resource allocation and error handling in wireless communication systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple PDSCHs are scheduled by a single DCI to improve resource utilization, then spectral efficiency is improved, but the complexity of HARQ-ACK payload generation increases due to multiple SLIV combinations
Solution Approach 1:
The patent segments the HARQ-ACK codebook generation process into distinct stages: determining the set of candidate PDSCHs, generating SLIV combinations, pruning invalid combinations, and generating the final payload. This segmentation allows complex multi-PDSCH HARQ-ACK generation to be handled systematically through modular processing steps, reducing implementation complexity while maintaining support for multiple scheduled PDSCHs
Solution Approach 2:
The patent performs preliminary SLIV pruning before HARQ-ACK payload generation by identifying and removing invalid SLIV combinations that cannot correspond to valid PDSCH receptions. This preliminary action reduces the search space and simplifies subsequent payload generation by eliminating impossible cases upfront, thereby reducing overall processing complexity
2Measurement precision
If SLIV pruning is performed to reduce invalid combinations and improve HARQ-ACK accuracy, then measurement precision is improved, but processing time increases
Solution Approach 1:
The patent applies partial SLIV pruning by selectively removing only the invalid combinations that can be easily identified through simple criteria (such as combinations that cannot correspond to valid PDSCH timing or resource allocations). Rather than performing exhaustive validation of all possible combinations, this partial action achieves sufficient accuracy improvement without incurring excessive processing time penalties
Data Source
AI summary
A terminal determines and reports a specific codebook-based HARQ-ACK on the basis of the result of receiving a plurality of PDSCHs, and, on the basis of a first-type codebook-based HARQ-ACK having been set for scheduling of the plurality of PDSCHs, the terminal can perform first start symbol and length indicator value (SLIV) pruning on the basis of a set of the SLIVs of PDSCHs, which can be potentially scheduled on each slot of a bundling window determined on the basis of a plurality of candidate PDSCH-to-HARQ feedback timing values, and perform second SLIV pruning on the basis of a set of the SLIVs of PDSCHs, which can be potentially scheduled even on at least one slot that does not belong to the bundling window.