Sidelink Beam Collision Detection via RSRQ Feedback
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Solution Overview
Problem
In wireless communications, especially in sidelink systems, collisions occur when multiple transmitting UEs send beam sweeping transmissions over the same resources, leading to interference and degradation or delay in initial beam pairing and beam management performance.
Innovation Solution
A receiving UE detects collisions by measuring the RSRQ or SINR of transmission beams and transmitting a negative acknowledgement (NACK) to the transmitting UE when the threshold is not met, facilitating efficient beam pairing and beam management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple transmitting UEs transmit beam sweeping transmissions over the same set of resources, then resource utilization is improved, but collision and interference occur degrading beam pairing performance
Solution Approach 1:
The receiving UE measures the quality of received beam sweeping transmissions and provides feedback to transmitting UEs about detected collisions. This feedback mechanism enables transmitting UEs to adjust their resource selection to avoid future collisions, resolving the contradiction between high resource utilization and reliable beam pairing.
Solution Approach 2:
The system performs preliminary collision detection by measuring reference signal quality before finalizing resource allocation. By detecting potential collisions in advance through RSRQ/SINR measurements, the system can prevent harmful interference before it degrades beam pairing performance.
2Productivity
If multiple transmitting UEs select overlapping resources for beam sweeping transmissions, then resource allocation efficiency is improved, but collision detection becomes more difficult
Solution Approach 1:
The receiving UE actively monitors and measures the quality of beam sweeping transmissions from multiple transmitting UEs, providing feedback about detected collisions. This feedback makes collision detection straightforward by directly reporting measurement results to transmitting UEs.
Solution Approach 2:
The receiving UE acts as an intermediary that facilitates collision detection between multiple transmitting UEs. By measuring and reporting collision conditions, the receiving UE simplifies the detection process that would otherwise be complex among multiple transmitters.
3Measurement precision
If the receiving UE transmits collision indication for every poor quality beam, then beam pairing accuracy is improved, but signaling overhead increases
Solution Approach 1:
The receiving UE applies different quality thresholds for different beam pairs, providing collision indications selectively based on local conditions. This approach maintains high beam pairing accuracy for critical beams while reducing unnecessary signaling for beams that clearly meet quality requirements.
Solution Approach 2:
The system adjusts the threshold for collision indication based on measured signal quality parameters. By dynamically changing the threshold parameter, the system balances between accurate beam pairing and minimizing signaling overhead, transmitting collision indications only when quality falls below the adaptive threshold.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. The techniques described herein relate to collision detection in order to reduce degradation and delay otherwise associated with initial beam pairing or beam management when a beam sweeping collision occurs in sidelink. A receiving UE receives, from a transmitting UE, one or more beam sweeping transmissions during a beam sweeping burst in a resource allocation. The receiving UE measures each reference signal of the beam sweeping burst based on receiving the one or more beam sweeping transmissions. The receiving UE transmits, to the transmitting UE, an indication of a collision between different beam sweeping transmissions during the beam sweeping burst based on the measurement satisfying a threshold.