NR Sidelink Resource Allocation Using RX UE Sensing Feedback
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Solution Overview
Problem
Existing sidelink communication systems face challenges in efficient resource allocation, leading to discovery failures and increased latency and uncertainty in resource selection.
Innovation Solution
Introduce RX UE-based sensing and resource allocation mechanisms, where the receiving UE performs sensing on sidelink control information (SCI) and measures RSRP to determine the acceptability of reserved resources, providing feedback to the transmitting UE to improve resource selection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If TX UE only performs sensing and resource allocation independently, then device complexity is reduced, but resource allocation efficiency deteriorates due to discovery failures and latency
Solution Approach 1:
The patent combines TX UE-based sensing with RX UE-based sensing and feedback mechanisms. The RX UE performs sensing on the TX UE's SCI transmissions and provides feedback about resource acceptability, merging the sensing functions of both transmitting and receiving UEs to improve overall resource allocation efficiency while distributing system complexity across multiple devices
Solution Approach 2:
The patent introduces a feedback mechanism where the RX UE evaluates the acceptability of reserved resources indicated in SCI from the TX UE and communicates this information back to the TX UE. This feedback loop enables the TX UE to make informed resource selection decisions, improving resource allocation efficiency by avoiding resources that would cause interference or conflicts
2Reliability
If common resource pool is used for all sidelink communications, then resource allocation simplicity is maintained, but reliability deteriorates due to resource conflicts and discovery failures
Solution Approach 1:
The RX UE provides feedback on the acceptability of reserved resources to the TX UE, enabling the TX UE to select resources that are less likely to cause conflicts or interference. This feedback mechanism improves the reliability of sidelink communication by reducing discovery failures while managing resource selection complexity through distributed intelligence
Solution Approach 2:
The RX UE performs sensing and evaluates resource acceptability before the TX UE finalizes its resource selection. This preliminary action by the RX UE allows the TX UE to avoid selecting resources that would cause conflicts, thereby improving reliability while distributing the computational complexity across both UEs
Data Source
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AI summary
Apparatus and methods are provided for sidelink resource allocation in a NR network. In one novel aspect, the RX UE based sensing and resource allocation are provided. The RX UE based sensing work independently or jointly with the TX UE based sensing and resource allocation. In one embodiment, the RX UE performs sensing based on SCI decoding of the other UEs' SCI and measures RSRP. The RX UE determines whether the reserved resources are acceptable based on sensing results derived from the measured RSRP results and a threshold. The RX UE indicates acceptability of the reserved resources to the TX UE. In one embodiment, the acceptability information carried with one additional bit multiplexing with an ACK/NACK (A/N) bit. In another embodiment, the acceptability information is not multiplexed with the A/N bit. In yet another embodiment, the acceptability information is transmitted on a feedback resource indicated in the received SCI.