HARQ-ACK Payload Generation via SLIV Pruning in Wireless Systems
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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, performing HARQ-ACK determinations, and optimizing start and length indicator values (SLIV) pruning to improve HARQ-ACK payload generation and processing, specifically in the context of 3GPP NR systems, to enhance multi-TTI scheduling and HARQ feedback mechanisms.
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 feedback management increases
Solution Approach 1:
The patent segments the HARQ-ACK feedback process into distinct components: bundling window determination based on K1 values, SLIV pruning for valid PDSCH identification, and separate payload generation for different time slots. This segmentation manages the complexity of handling multiple PDSCHs by breaking down the feedback management into structured, manageable steps.
Solution Approach 2:
The patent performs preliminary actions by pre-determining the bundling window based on candidate K1 values before generating the HARQ-ACK payload. The SLIV pruning is performed in advance to identify valid PDSCH combinations, which simplifies the subsequent payload generation process and reduces real-time processing complexity.
2Reliability
If SLIV pruning is performed for slots outside the bundling window to improve HARQ-ACK accuracy, then feedback reliability is improved, but processing time increases
Solution Approach 1:
The patent applies partial action by performing SLIV pruning selectively - only for slots that contain potentially valid PDSCHs based on the bundling window determination. This avoids unnecessary processing of all slots while ensuring that relevant slots are properly evaluated, thus balancing reliability improvement with processing time constraints.
3Loss of information
If HARQ-ACK payload includes all candidate PDSCHs to ensure complete feedback, then feedback completeness is improved, but payload size increases
Solution Approach 1:
The patent extracts and removes invalid PDSCH entries from the HARQ-ACK payload through SLIV pruning. By identifying and eliminating PDSCHs with invalid start and length indicators, the payload size is reduced while maintaining completeness for all validly scheduled PDSCHs within the determined bundling window.
Data Source
AI summary
A terminal according to one embodiment of the present invention 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.