Sidelink Feedback Coordination for Multi-User Superposition Transmission
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently coordinating sidelink feedback for multi-user superposition transmission, particularly when groupcast and unicast communications are concurrently transmitted using superposition coding, leading to ambiguity in resource allocation and feedback channel operation.
Innovation Solution
The proposed solution involves a user equipment (UE) that receives groupcast and unicast communications concurrently, determines a feedback sequence based on decoding outcomes, and transmits this sequence in designated sidelink feedback resources, using distinct or shared resources depending on the decoding success of both communications, to provide joint or independent acknowledgments/negative acknowledgments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If groupcast and unicast communications are concurrently transmitted using superposition coding, then spectral efficiency is improved, but resource allocation ambiguity and feedback channel operation complexity increase
Solution Approach 1:
The feedback resource is segmented into multiple distinct resources: a first feedback resource for groupcast communications and a second feedback resource for unicast communications. This segmentation allows the receiving device to clearly distinguish and process feedback for different communication types, resolving the ambiguity caused by superposition coding while maintaining the spectral efficiency benefits of concurrent transmission.
Solution Approach 2:
The patent introduces an intermediary mechanism where the receiving device determines whether to transmit feedback on the first or second feedback resource based on the decoding outcome of the groupcast communication. This intermediary decision-making process mediates between the superimposed transmissions and the feedback channel, enabling clear feedback transmission without increasing overall system complexity.
2Quantity of substance
If joint feedback is transmitted for both groupcast and unicast communications, then feedback channel resource usage is reduced, but feedback information clarity and reliability decrease
Solution Approach 1:
The feedback channel is divided into separate resources for groupcast and unicast feedback. This segmentation ensures that feedback information for each communication type is transmitted independently and clearly, maintaining feedback information clarity and reliability while using feedback resources efficiently through targeted transmission.
3Reliability
If separate feedback resources are allocated for groupcast and unicast communications, then feedback information clarity is improved, but resource allocation complexity and overhead increase
Solution Approach 1:
The receiving device dynamically selects which feedback resource to use based on the decoding outcome of the groupcast communication. If groupcast decoding is successful, feedback is transmitted on the first feedback resource; if unsuccessful, feedback is transmitted on the second feedback resource. This dynamic selection mechanism provides clear feedback information while adapting resource allocation to actual communication conditions, reducing overall complexity.
4Productivity
If feedback transmission depends on groupcast decoding outcome, then resource utilization efficiency is improved, but feedback transmission timing and coordination complexity increase
Solution Approach 1:
The receiving device performs groupcast decoding before determining the feedback transmission resource. This preliminary action allows the device to pre-determine which feedback resource (first or second) will be used based on the decoding outcome, enabling efficient resource utilization while maintaining clear coordination through a predetermined decision sequence.
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive, on a sidelink, a groupcast communication and a unicast communication concurrently from a transmitter. The UE may determine a feedback sequence to be transmitted to indicate joint acknowledgment or negative acknowledgement feedback for the groupcast communication and the unicast communication based at least in part on a decoding of the groupcast communication. The UE may transmit the feedback sequence in one or more sidelink feedback resources associated with a sidelink subchannel via which at least one of the groupcast communication or the unicast communication is received. Numerous other aspects are provided.