Sidelink HARQ Codebook Consolidation for Feedback Efficiency
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Solution Overview
Problem
Current sidelink communication systems in new radio (NR) networks face inefficiencies in feedback mechanisms for hybrid automatic repeat request (HARQ) processes, particularly in transmitting and receiving hybrid automatic repeat request-acknowledgement/negative acknowledgement (HARQ-ACK/NACK) bits between terminals and base stations, which affects the overall performance of sidelink communication.
Innovation Solution
The proposed solution involves an operation method for sidelink communication where a source terminal transmits and receives transport blocks or code block groups, generates an HARQ codebook based on received HARQ-ACK/NACK bits, and reports it to the serving base station through physical uplink control or shared channels, while the destination terminal transmits HARQ-ACK/NACK bits through physical sidelink feedback channels, enabling efficient feedback and reporting mechanisms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If HARQ-ACK/NACK bits are transmitted through multiple physical sidelink feedback channels, then feedback reliability is improved, but channel resource consumption increases
Solution Approach 1:
The patent combines multiple HARQ-ACK/NACK bits into a single HARQ codebook that is transmitted through one consolidated feedback channel rather than distributing them across multiple channels. This merging approach maintains feedback reliability while reducing channel resource consumption by consolidating the feedback transmission.
Solution Approach 2:
The HARQ codebook serves as a universal feedback mechanism that can carry multiple HARQ-ACK/NACK bits simultaneously, making the feedback channel multi-functional. This allows the system to transmit comprehensive feedback information through a single channel resource, improving efficiency without sacrificing reliability.
2Productivity
If HARQ codebook is reported through physical uplink control channel, then feedback efficiency is improved, but uplink control channel capacity is consumed
Solution Approach 1:
The patent merges multiple HARQ-ACK/NACK feedback bits into a single HARQ codebook structure that is transmitted through the physical uplink control channel. This consolidation improves feedback efficiency by reducing the number of separate transmissions required while managing uplink control channel capacity through structured codebook formation.
3Productivity
If multiple transport blocks or code block groups are transmitted, then data throughput is improved, but feedback processing complexity increases
Solution Approach 1:
The patent segments the feedback processing into structured codebook formation, where multiple HARQ-ACK/NACK bits corresponding to multiple transport blocks or code block groups are organized into a systematic HARQ codebook. This segmentation approach enables efficient handling of high data throughput by providing a clear framework for processing multiple feedback bits, thereby managing complexity through structured organization.
Data Source
AI summary
An operation method of a source terminal for sidelink communication comprises transmitting at least two transport blocks (TBs) or code block groups (CBGs) to a destination terminal, and receiving hybrid automatic repeat request-acknowledgement/negative acknowledgement (HARQ-ACK/NACK) bits for the at least two TBs or CBGs from the destination terminal. The operation method further comprises generating an HARQ codebook based on the HARQ-ACK/NACK bits, and reporting the generated HARQ codebook to a serving base station.