Sidelink Receiver Feedback for Collision Avoidance in COT Resources
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently managing sidelink transmissions due to issues like transmitter deafness and collisions in channel occupancy time (COT) resources, which affect the reliability and efficiency of peer-to-peer communications.
Innovation Solution
The implementation of an apparatus and method for wireless communication that involves a receiver processing multiple sidelink control informations (SCIs) from transmitters to schedule COT resources. The receiver then transmits acknowledgement or negative acknowledgement (A/N) feedback to the transmitters via a physical sidelink feedback channel (PSFCH) or sidelink feedback information (SLFI), adjusting the Listen-Before-Talk (LBT) and Physical Sidelink Shared Channel (PSSCH) transmissions accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If transmitter performs LBT and PSSCH transmission based on SCI scheduling, then channel occupancy time resources are allocated, but collisions occur in COT resources affecting transmission reliability
Solution Approach 1:
The receiver transmits A/N feedback (acknowledgement or negative acknowledgement) to the transmitter via PSFCH or SLFI before the transmitter performs LBT and PSSCH transmission. This feedback mechanism allows the transmitter to adjust its transmission based on receiver status, preventing collisions and improving reliability while maintaining efficient resource allocation.
2Reliability
If receiver transmits A/N feedback before LBT and PSSCH transmission, then transmission collisions are prevented, but additional feedback transmission time is required
Solution Approach 1:
The A/N feedback is transmitted before the transmitter performs LBT and before PSSCH transmission begins. This preliminary feedback action allows the transmitter to make informed decisions about resource allocation and transmission timing, preventing collisions upfront while the timing is integrated into the existing frame structure to minimize additional time overhead.
3Productivity
If multiple SCIs are processed for COT resource scheduling, then resource utilization is optimized, but receiver processing complexity increases
Solution Approach 1:
The receiver processes multiple SCIs (Sidelink Control Informations) that schedule COT resources in a structured manner, analyzing each SCI to determine resource allocation conflicts and transmitting appropriate A/N feedback. This segmented processing approach enables efficient resource utilization while managing complexity through systematic handling of individual control information elements.
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a receiver may receive, from two or more transmitters, two or more sidelink control informations (SCIs) that schedule channel occupancy time (COT) resources for the two or more transmitters. The receiver may transmit, to a transmitter of the two or more transmitters, an acknowledgement or negative acknowledgement (A/N) feedback via a mini-slot carrying a physical sidelink feedback channel (PSFCH) or sidelink feedback information (SLFI) with SCI. The A/N feedback may be transmitted before a listen-before-talk (LBT) and physical sidelink shared channel (PSSCH) transmission. The receiver may receive, from the transmitter using a COT resource, the PSSCH transmission based at least in part on the A/N feedback. The LBT and the PSSCH transmission may be adjustable at the transmitter based at least in part on the A/N feedback. Numerous other aspects are described.