Sidelink Coordination Signaling for UE Resource Conflict Resolution
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently managing conflicts between sidelink resources reserved by different user equipment (UEs) due to overlapping reservations in time and frequency, leading to inefficiencies and potential communication disruptions.
Innovation Solution
Implementing a UE that includes a transceiver and processor to receive and analyze sidelink control information (SCI) formats 1-A from multiple UEs, identify conflicts based on priority values, and transmit physical sidelink feedback channels (PSFCH) to resolve resource conflicts by indicating conflict information to the appropriate UE, thereby facilitating SL resource re-selection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If multiple UEs reserve sidelink resources independently without coordination, then each UE can autonomously select resources, but resource conflicts occur when reservations overlap in time and frequency
Solution Approach 1:
The patent implements a feedback mechanism where UEs transmit conflict information through PSFCH channels to notify other UEs of resource reservations. This feedback loop enables autonomous UEs to adjust their resource selections based on received conflict information, resolving conflicts while maintaining operational autonomy.
Solution Approach 2:
The PSFCH channel acts as an intermediary mechanism between UEs, carrying conflict information that mediates resource allocation decisions. This intermediary enables indirect coordination without requiring direct UE-to-UE negotiation, allowing autonomous operation while preventing conflicts.
2Reliability
If conflict information is transmitted through PSFCH channels, then resource conflicts can be resolved, but signaling overhead and system complexity increase
Solution Approach 1:
The PSFCH channel, originally designed for other purposes, is utilized multi-functionally to carry conflict information in addition to its primary function. This approach enables conflict resolution without adding dedicated signaling infrastructure, thereby limiting the increase in system complexity.
Solution Approach 2:
The patent modifies the PSFCH channel parameters and structure to accommodate conflict information transmission. By changing the parameter set of an existing channel rather than creating a new one, the system achieves conflict resolution capabilities with minimal complexity overhead.
3Productivity
If UEs continuously monitor and report resource conflicts, then resource utilization is optimized, but energy consumption and processing load increase
Solution Approach 1:
Instead of continuous monitoring and reporting, the system implements periodic conflict information transmission at specific intervals and trigger events. This periodic approach maintains optimized resource utilization while significantly reducing energy consumption compared to continuous operation.
Solution Approach 2:
The system enables UEs to autonomously determine when conflict information should be transmitted based on local conditions and received feedback. This self-service approach allows each UE to optimize its own energy consumption while collectively achieving improved resource utilization through coordinated resource selection.
Data Source
AI summary
Methods and apparatus for inter-UE coordination signaling in a wireless communication system. A method of operating a UE includes receiving a first SCI format 1-A from a first UE and a second SCI format 1-A from a second UE. The first SCI format 1-A includes a first priority value p1 and reserves a first SL resource. The second SCI format 1-A includes a second priority value p2 and reserves a second SL resource. The method further includes identifying a conflict when the first and second SL reserved resources overlap in time and frequency; determining, based on the priority values, whether to indicate conflict information to the first UE or the second UE; and transmitting a PSFCH with the conflict information. When p1>p2, the conflict information is indicated to the first UE and, when p1=p2, the conflict information is indicated to the first UE or the second UE.