NR Sidelink Resource Selection Using UE Assistant Feedback
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Solution Overview
Problem
In new radio (NR) sidelink communication, user equipment (UE) operating in mode 2 faces challenges in selecting sidelink resources without prior sensing, particularly when hidden-node or half-duplex issues arise, necessitating a solution for obtaining sensing results or assistant information from other UEs.
Innovation Solution
A method where UEs exchange one-bit indications in sidelink control information (SCI) to request and provide assistant information for resource selection, using pre-defined or pre-configured feedback resources based on traffic priority and packet size, enabling UEs to share sensing results and reserved resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a UE operates in mode 2 without performing sensing, then the device complexity and processing time are reduced, but the reliability of resource selection deteriorates due to hidden-node and half-duplex issues
Solution Approach 1:
The patent introduces an intermediary mechanism where a requesting UE obtains assistant information (sensing results) from a providing UE. The providing UE acts as a mediator that has performed sensing and shares its results with other UEs that wish to avoid performing full sensing themselves. This resolves the contradiction by allowing UEs to achieve reliable resource selection without executing complex sensing procedures, as they can rely on the sensing results provided by others in the groupcast communication scenario.
2Measurement precision
If a UE requests and transmits assistant information, then the resource selection accuracy is improved, but the use of feedback resources and system overhead increases
Solution Approach 1:
The patent implements a self-service mechanism where UEs that are capable of providing assistant information do so autonomously based on their own sensing capabilities and the requests received. The providing UE independently manages its sensing results and selectively shares them with requesting UEs. This approach improves resource selection accuracy for requesting UEs while controlling feedback resource consumption, as the system leverages the existing sensing capabilities of UEs rather than requiring centralized coordination or additional dedicated feedback resources for all UEs.
Data Source
AI summary
Embodiments of the present disclosure relate to methods and apparatus for sidelink communication. According to an embodiment of the present disclosure, a method performed by a first user equipment (UE) for wireless communication may include: receiving a sidelink transmission including a first indication to indicate whether a second UE has an ability of providing assistant information for resource selection; and in response to the first indication indicating that the second UE has the ability of providing the assistant information, transmitting a request for the assistant information on one or more feedback resources associated with the sidelink transmission.