Inter-UE Coordination for Sidelink Resource Conflict Avoidance
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Solution Overview
Problem
In wireless communication systems, the lack of coordination between user equipment (UE) operating on different radio access technologies (RATs) leads to resource conflicts and inefficiencies in sidelink communications, particularly when NR and LTE devices share the same or overlapping channels.
Innovation Solution
The implementation of inter-UE coordination techniques, where a UE capable of supporting multiple RATs performs sensing of sidelink messages to determine resource reservations by other UEs, and transmits resource information to other UEs to avoid collisions and optimize resource usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If UEs operating on different RATs share the same wireless spectrum without coordination, then spectrum utilization is improved, but resource conflicts and collisions increase
Solution Approach 1:
A coordinating UE acts as an intermediary between UEs on different RATs. The coordinating UE performs sensing on both LTE and NR sidelink channels, collects resource reservation information from both RATs, and shares this information with other UEs through coordination messages. This intermediary approach enables spectrum sharing while preventing resource conflicts through centralized coordination.
2Reliability
If a UE performs sensing of sidelink channels to determine resource reservations, then resource collision avoidance is improved, but device complexity increases
Solution Approach 1:
The sensing function is segmented between coordinating UEs and non-coordinating UEs. Coordinating UEs perform comprehensive sensing on multiple RATs and maintain resource reservation information, while non-coordinating UEs rely on coordination messages from these coordinating UEs. This segmentation reduces the sensing burden and complexity for individual UEs while maintaining collision avoidance capability.
3Productivity
If resource information is shared between UEs on different RATs, then resource allocation efficiency is improved, but message transmission overhead increases
Solution Approach 1:
The coordination message structure is designed to be universal and multi-functional. A single coordination message can convey resource reservation information for multiple RATs, resource availability status, and collision warnings simultaneously. This multi-functionality reduces the number of separate messages needed and minimizes overall overhead while maintaining efficient resource allocation.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. A first user equipment (UE) sense sidelink transmissions to determine a set of resources that may be reserved by one or more other UEs. The set of resources may include a first subset of resources associated with a first radio access technology (RAT) and a second subset of resources associated with a second, different RAT. The first UE may transmit a message to a second UE indicating resource information for transmissions by the second UE, and the resource information may indicate that the first subset of resources is associated with the first RAT and that the second subset of resources is associated with the second RAT. Additionally, or alternatively, the first UE may transmit an indication of collisions between resources reserved for transmissions associated with the first RAT and resources reserved for transmissions associated with the second RAT.