Sidelink Resource Sensing Using Historical Pathloss for Beam Interference
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently managing interference and signaling overhead during contention-based sidelink resource selection in Mode 2 operations, particularly in vehicle-to-everything (V2X) systems, due to frequent inter-UE coordination messages for beamforming alignment.
Innovation Solution
First UEs utilize historical pathloss measurements to identify available resources for beamformed sidelink communications, combining their own measurements with those from other UEs to determine if beam combinations will cause unacceptable interference, thereby reducing the need for frequent inter-UE coordination messages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If inter-UE coordination messages are frequently exchanged for beamforming alignment, then beamformed sidelink communications can be achieved, but signaling overhead increases
Solution Approach 1:
The system performs preliminary sensing and pathloss measurements during a sensing window before resource selection. UEs collect pathloss measurements to reference signal received power (RSRP) values and identify resources that are likely to cause unacceptable interference. This preliminary action allows UEs to pre-determine safe resource selections without requiring frequent coordination messages during actual transmission, thereby reducing signaling overhead while maintaining beamforming alignment reliability
Solution Approach 2:
Each UE independently performs sensing, pathloss measurement, and resource selection based on its own measurements and pre-configured thresholds. The UE autonomously determines which resources to avoid and selects safe resources without needing to exchange coordination messages with other UEs. This self-service mechanism eliminates the need for frequent inter-UE coordination while maintaining reliable beamformed communications through autonomous interference avoidance
2Loss of information
If traditional sensing methods are used for resource selection, then resource availability can be monitored, but interference management becomes complex
Solution Approach 1:
The system changes the parameter used for resource selection from traditional RSRP-based sensing to pathloss-based sensing. By measuring pathloss values and comparing them against pre-configured thresholds, UEs can directly identify resources that will cause unacceptable interference. This parameter change simplifies interference management by providing a direct relationship between measured pathloss and potential interference, eliminating complex interference calculation and coordination mechanisms
Data Source
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AI summary
Methods, systems, and devices for wireless communications are described. Aspects of the present disclosure provide for a user equipment (UE) performing contention-based access to utilize historical pathloss measurements to identify available resources for beamformed sidelink communications. The historical pathloss measurements may be obtained by the UE, by one or more other UEs, or both, where the UE may combine its own historical pathloss measurements with historical pathloss measurements obtained at the one or more other UEs. Such historical pathloss measurements may allow the UE to determine if one or more beam combinations associated with the resources may cause unacceptable interference (e.g., interference satisfying a threshold) while reducing signaling overhead associated with exchanges of inter-UE coordination messages. Accordingly, the UE may determine to yield transmissions over one or more resources or to yield reception to allow other UEs to utilize the one or more resources.