Sidelink Groupcast HARQ Feedback Identification With Orthogonal 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 are provided to manage HARQ responses by configuring orthogonal sequences for each receiving terminal, allowing the transmitting terminal to distinguish between ACK and NACK responses through physical resource monitoring.
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 resources for different receiving terminals. Each receiving terminal is assigned a dedicated feedback resource (e.g., different time slots, frequency resources, or code divisions) within the PSFCH, allowing the transmitting terminal to distinguish and identify HARQ responses from each terminal individually despite them all participating in the same groupcast communication.
2Device complexity
If the transmitting terminal uses the same radio resource for all receiving terminals, then resource allocation is simplified, but the transmitting terminal cannot distinguish between ACK and NACK responses from different terminals
Solution Approach 1:
The patent resolves the contradiction by adding another dimension to the resource allocation structure. Instead of using a single shared resource, it introduces multiple feedback resources dimensioned by terminal identifier or feedback type. This allows the system to maintain simplified groupcast operation while achieving precise HARQ response differentiation through the additional dimensional separation in the time-frequency-code space.
3Productivity
If multiple receiving terminals share the same feedback resource, then the system achieves efficient resource utilization, but individual terminal feedback identification becomes impossible
Solution Approach 1:
The patent introduces an intermediary mechanism in the form of terminal-specific feedback resources or identifiers within the PSFCH. This intermediary structure allows multiple terminals to share the general feedback channel while maintaining individual identification capability. The intermediary resource allocation enables both efficient resource utilization across the groupcast and reliable individual feedback identification through the mediating feedback resources.
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.