Sidelink HARQ-ACK Codebook Reporting for Unified Feedback
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently managing and reporting hybrid automatic repeat request (HARQ) feedback signals, particularly in the context of 5G communication systems, which are crucial for enhancing data transmission reliability and efficiency, especially in scenarios involving sidelink transmissions and diverse communication modes.
Innovation Solution
A codebook-based feedback method is introduced for user equipment (UE) to generate and report HARQ-ACK feedback information, including dynamic and semi-static codebooks, which integrate and differentiate between sidelink and downlink transmissions, using various timing indicators and resource allocation mechanisms to optimize HARQ-ACK reporting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If HARQ-ACK feedback information for sidelink and downlink transmissions is reported separately, then the feedback processing is simple, but the feedback overhead increases and system efficiency decreases
Solution Approach 1:
The patent combines HARQ-ACK feedback information for sidelink transmissions and downlink transmissions into a single codebook structure. The feedback information is organized with sidelink HARQ-ACK bits followed by downlink HARQ-ACK bits in a unified format, allowing both types of feedback to be reported together in one message, thereby reducing overhead and improving system efficiency.
Solution Approach 2:
Within the unified HARQ-ACK codebook, the patent segments the feedback information into distinct portions: a first portion for sidelink transmissions and a second portion for downlink transmissions. This segmentation allows the base station to process and interpret different feedback types correctly while maintaining a consolidated reporting structure that reduces overall complexity.
2Measurement precision
If dynamic codebook is used for HARQ-ACK feedback, then the feedback accuracy is improved, but the codebook size increases and processing time increases
Solution Approach 1:
The patent implements a dynamic codebook mechanism where the size and structure of the HARQ-ACK codebook are adjusted based on the actual number of sidelink and downlink transmissions that require feedback. The codebook dynamically expands or contracts to accommodate varying feedback requirements, ensuring accurate feedback for all transmissions while avoiding unnecessary processing time for empty or minimal feedback cases.
Data Source
AI summary
A method performed by a terminal in a wireless communication system is provided, the method includes receiving, from a base station, a sidelink configured grant for a sidelink transmission, transmitting, to another terminal, a sidelink signal based on the sidelink configured grant, generating a second hybrid automatic repeat request (HARQ) acknowledgement (HARQ-ACK) information based on whether first HARQ-ACK information corresponding to the sidelink signal is received from the another terminal, and reporting on an uplink channel, to a base station, the second HARQ-ACK information.