Sidelink HARQ Feedback Differentiation Using Orthogonal PSFCH Sequences
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Solution Overview
Problem
In sidelink-groupcast communication, the transmitting terminal cannot identify the HARQ responses of individual receiving terminals, as multiple terminals transmit HARQ responses using the same radio resource, leading to inefficiencies.
Innovation Solution
A method and apparatus for transmitting and receiving HARQ responses in sidelink communication systems, where a transmitting terminal receives PSFCH configuration information, sends SCI with resource allocation, and monitors PSFCH resources for distinct HARQ responses using orthogonal sequences, enabling the differentiation of ACK/NACK feedback.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple receiving terminals transmit HARQ responses using the same radio resource in sidelink-groupcast communication, then the system can support groupcast mode with simplified resource allocation, but the transmitting terminal cannot identify the HARQ responses of individual receiving terminals
Solution Approach 1:
The patent segments the HARQ response identification problem by introducing separate feedback resource regions for different receiving terminals. Each receiving terminal is assigned a dedicated feedback resource region, allowing the transmitting terminal to distinguish and identify HARQ responses from each terminal individually, thus resolving the information loss problem while maintaining groupcast communication support.
2Productivity
If the transmitting terminal uses the same radio resource for HARQ feedback from multiple receiving terminals, then resource utilization is improved, but the transmitting terminal cannot distinguish individual terminal responses
Solution Approach 1:
The patent introduces a new dimension for HARQ feedback by creating separate feedback resource regions in the time-frequency domain. Instead of relying solely on the same radio resource for all terminals, the system allocates distinct resource regions (e.g., different time slots or frequency blocks) for each receiving terminal's feedback, enabling the transmitting terminal to differentiate responses while efficiently utilizing the overall feedback bandwidth.
3Loss of information
If distinct feedback resource regions are allocated for each receiving terminal, then the transmitting terminal can identify individual HARQ responses, but the system complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-configuring and pre-allocating feedback resource regions for each receiving terminal before the actual HARQ feedback transmission. The base station or transmitting terminal establishes the feedback resource region assignments in advance, so that during operation, the transmitting terminal can directly use these pre-defined regions to receive and identify HARQ responses without performing complex real-time resource allocation or differentiation.
Data Source
AI summary
Disclosed are a method and an apparatus for transmitting and receiving HARQ responses in a communication system supporting sidelink communication. The method of operating a transmitting terminal comprises the steps of: receiving, from a base station, a higher layer signaling message including PSFCH configuration information; transmitting, to a plurality of receiving terminals, SCI including resource allocation information of data and configuration information for HARQ feedback for the data; transmitting the data to the plurality of receiving terminals in a PSSCH indicated by the SCI; and performing a monitoring operation to receive, from the plurality of receiving terminals, sequences mapped to HARQ responses for the data in a PSFCH resource region indicated by the PSFCH configuration information. Therefore, the performance of a communication system can be improved.