Sidelink Cancellation Indication for PSFCH and S-SSB Overlap
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently canceling sidelink channels, particularly in scenarios where resources overlap with physical sidelink feedback channels (PSFCH), gap symbols, or sidelink synchronization signal blocks (S-SSB), leading to interference and reduced reliability.
Innovation Solution
A user equipment (UE) receives a sidelink cancellation indication that specifies a set of resources to cancel sidelink communications, which may overlap with PSFCH, gap symbols, or S-SSB. The UE then performs appropriate sidelink cancellation actions, such as deferring HARQ feedback messages or canceling sidelink transmissions, to align with the indicated resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sidelink cancellation indication is applied to resources overlapping with PSFCH, gap symbols, or S-SSB, then interference is reduced and reliability is enhanced, but UE behavior consistency becomes challenging due to different channel requirements
Solution Approach 1:
The patent segments the sidelink resource cancellation indication by channel type. Different cancellation behaviors are defined for different channel types (PSFCH, S-SSB, gap symbols), allowing each channel to be handled according to its specific requirements while maintaining overall system reliability
Solution Approach 2:
The patent establishes preliminary rules for UE behavior before cancellation scenarios occur. The specification pre-defines how UEs should handle cancellation indications for each channel type, ensuring consistent behavior without requiring complex real-time decision-making
2Reliability
If sidelink transmissions are canceled in overlapping resources, then interference with high-priority communications is reduced, but resource utilization efficiency decreases
Solution Approach 1:
The patent applies local quality by treating different resource regions differently. Resources overlapping with high-priority channels (PSFCH, S-SSB) are canceled to ensure reliability, while non-overlapping resources continue normal transmissions to maintain efficiency. Each resource's cancellation status is determined by its local characteristics
3Reliability
If UE performs cancellation actions for all overlapping channels, then interference is minimized, but latency increases due to additional processing and deferral
Solution Approach 1:
The patent applies partial action by having UEs perform cancellation only when necessary - specifically when resources overlap with PSFCH, S-SSB, or gap symbols. Not all sidelink resources are canceled, only those that would cause interference with critical channels, reducing unnecessary processing latency while maintaining reliability
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive a sidelink cancellation indication that indicates a set of resources in which to cancel sidelink communications, wherein the set of resources overlaps with at least one of a physical sidelink feedback channel (PSFCH), a gap symbol, or a sidelink synchronization signal block (S-SSB). The UE may perform one or more sidelink cancellation actions associated with the at least one of the PSFCH, the gap symbol, or the S-SSB. Numerous other aspects are described.