Unified HARQ-ACK Codebook for DL and Sidelink Feedback
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Solution Overview
Problem
Existing sidelink communication systems face inefficiencies in transmitting and receiving hybrid automatic repeat request (HARQ) responses, particularly in unicast schemes, which affect the performance of Vehicle-to-Everything (V2X) communications.
Innovation Solution
The terminal generates an HARQ-ACK codebook that includes both DL HARQ information bits and SL HARQ information bits, ensuring the same type of codebook is used for both, facilitating efficient transmission and improving communication system performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If separate codebooks are used for DL HARQ and SL HARQ responses, then the transmission protocol can be simple and easy to implement, but the transmission efficiency is reduced and communication performance deteriorates
Solution Approach 1:
The patent merges DL HARQ and SL HARQ responses into a single unified HARQ-ACK codebook structure. The terminal device generates one codebook that contains both downlink and sidelink HARQ acknowledgment bits, eliminating the need for separate codebook generation and transmission procedures. This consolidation directly improves transmission efficiency by reducing signaling overhead and processing complexity.
Solution Approach 2:
The unified HARQ-ACK codebook serves multiple functions simultaneously: it carries both DL HARQ feedback and SL HARQ feedback, and supports multiple codebook types (semi-static and dynamic) within a single structure. This multi-functional design allows the system to maintain flexibility while improving overall transmission efficiency.
2Productivity
If unified HARQ-ACK codebook is used for both DL and SL HARQ responses, then transmission efficiency is improved, but the complexity of codebook generation and management increases
Solution Approach 1:
The unified HARQ-ACK codebook is segmented into distinct bit fields: DL HARQ information bits and SL HARQ information bits. Each segment follows its own formatting rules and can be independently configured. This segmentation allows the terminal to generate the unified codebook in an organized manner, reducing the perceived complexity while maintaining the benefits of unification.
Solution Approach 2:
The patent implements dynamic codebook generation where the terminal can adaptively select between semi-static and dynamic codebook types based on scheduling conditions. The codebook structure dynamically adjusts to include only the necessary HARQ bits for the current transmission scenario, reducing unnecessary processing complexity while maintaining high transmission efficiency.
Data Source
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AI summary
Disclosed are a method and a device for transmitting and receiving a HARQ response in a communication system. An operating method for a first terminal comprises the steps of: receiving, from a base station, setting information comprising a first information element for indicating the type of a HARQ-ACK codebook; generating the HARQ-ACK codebook comprising a DL HARQ information bit about downlink communication between the base station and the first terminal, and an SL HARQ information bit about sidelink communication between the first terminal and a second terminal; and transmitting the HARQ-ACK codebook to the base station by using an uplink channel.