Inter-UE Coordination Messages for Sidelink Resource Collision Reduction
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Solution Overview
Problem
There is a need for improved inter-UE coordination in sidelink communications to enhance resource allocation and reduce collisions in wireless networks, particularly in scenarios where a scheduling entity is not available.
Innovation Solution
The implementation of inter-UE coordination (IUC) messages that indicate preferred and non-preferred resources for sidelink transmissions, allowing UEs to coordinate their resource selection and avoid collisions through mechanisms such as physical sidelink feedback channels, sidelink control information, and medium access control elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If UEs autonomously select resources for sidelink transmissions without scheduling entity coordination, then device autonomy and communication reliability are improved, but resource collisions and interference increase
Solution Approach 1:
The patent implements feedback mechanisms where UEs transmit sidelink control information (SCI) containing resource selection details and receive feedback from other UEs about resource availability. This feedback loop enables UEs to adjust their resource selections dynamically, reducing collisions while maintaining autonomous operation. The feedback includes information about preferred and non-preferred resources, allowing receiving UEs to make informed decisions about their own resource selections.
Solution Approach 2:
The patent employs preliminary resource reservation mechanisms where UEs indicate their intended resource selections in advance through SCI transmissions. By announcing resource preferences and reservations before actual transmissions occur, UEs can coordinate implicitly to avoid collisions. This preliminary action allows other UEs to adjust their resource selections based on advance knowledge of upcoming transmissions, reducing harmful interference while preserving device autonomy.
2Productivity
If IUC messages are transmitted to coordinate resource selection between UEs, then resource allocation efficiency is improved, but message overhead and system complexity increase
Solution Approach 1:
The patent merges the IUC message functionality into existing sidelink control information (SCI) structures. Rather than creating separate dedicated coordination messages, the resource coordination information is combined with the regular SCI transmissions that UEs already perform for sidelink communication. This merging approach enables resource coordination without adding separate message overhead, maintaining resource allocation efficiency while minimizing system complexity.
Solution Approach 2:
The patent designs the SCI structure to serve multiple functions simultaneously: it carries both the essential sidelink control information needed for communication and the inter-UE coordination information for resource selection. This multi-functionality allows a single message structure to achieve both communication control and resource coordination, improving resource allocation efficiency without increasing the number of separate messages or system complexity.
Data Source
AI summary
Certain aspects of the present disclosure provide techniques for indicating and categorizing resources in an inter-CE coordination (IUC) message, triggering a UE to send IUC messages to other UEs. and identifying recipient UE(s) for IUC messages. An example method performed by a user equipment (UE) generally includes: detecting at least one condition is met for triggering transmission of an inter-UE coordination (IUC) message; including, in the IUC message, an indication of at least one second UE that is an intended recipient of the IUC message and an indication of resources for the second UE to consider for its own resource selection; and transmitting the IUC message.