Inter-UE Coordination Signaling for Sidelink Collision Mitigation
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Solution Overview
Problem
Current 5G wireless communication systems face challenges in managing sidelink communications due to issues like half-duplex and co-channel collisions, which degrade performance and reliability in NR-V2X systems, especially in scenarios with dynamic topologies and high-reliability low-latency requirements.
Innovation Solution
Implementing inter-UE coordination feedback signaling to detect and mitigate sidelink collisions and half-duplex conflicts through enhanced resource re-selection procedures and prioritization methods, ensuring low latency and high reliability in sidelink communications by using new processing times and feedback timing options.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If inter-UE coordination feedback signaling is implemented to detect and mitigate sidelink collisions, then reliability is improved, but device complexity increases
Solution Approach 1:
The patent implements inter-UE coordination feedback signaling where receiving UEs detect collisions and half-duplex conflicts by monitoring sidelink control information, then provide feedback to transmitting UEs about resource conflicts. This feedback mechanism enables transmitting UEs to identify problematic resources and perform re-selection, directly improving reliability through collision mitigation while managing complexity through structured feedback protocols
Solution Approach 2:
The patent introduces coordination feedback signaling as an intermediary mechanism between transmitting and receiving UEs. The receiving UE acts as a mediator that observes channel conditions, detects conflicts, and communicates this information back to transmitting UEs, enabling indirect collision avoidance without requiring direct sensing between all transmitting UEs, thus balancing reliability improvement with complexity management
2Reliability
If enhanced resource re-selection procedures are used to mitigate collisions, then reliability is improved, but processing time increases
Solution Approach 1:
The patent implements preliminary detection of collisions and half-duplex conflicts through coordination feedback signaling before actual data transmission occurs. By identifying problematic resources in advance through feedback from receiving UEs, transmitting UEs can perform re-selection proactively, preventing collisions rather than reacting to them, thus reducing overall processing time while maintaining reliability
Solution Approach 2:
The patent introduces dynamic resource re-selection based on real-time coordination feedback. Transmitting UEs adaptively adjust their resource selection based on collision detection information received from other UEs, allowing the system to dynamically respond to changing channel conditions and conflict situations, optimizing the balance between reliability and processing time
3Reliability
If inter-UE coordination signaling is implemented to address half-duplex conflicts, then communication reliability is improved, but system complexity increases
Solution Approach 1:
The patent implements targeted feedback signaling specifically for half-duplex conflict detection. Receiving UEs monitor sidelink control information to identify when transmitting UEs are in half-duplex mode (unable to receive while transmitting), then provide specific feedback about these conflict conditions. This enables transmitting UEs to adjust their timing or resource selection to avoid half-duplex conflicts, improving reliability through dedicated feedback mechanisms while managing complexity through focused conflict resolution
Data Source
AI summary
An apparatus and system for inter-UE coordination feedback for sidelink communications are described. In particular, inter-UE coordination feedback signaling for reliable sidelink communication including transmitter-based resource allocation and signaling of conflicts, prioritization of the inter-UE coordination feedback, and timing of the inter-UE coordination feedback are described. Sidelink hybrid acknowledgment request (HARQ) acknowledgment/negative acknowledgment (ACK/NACK) or NACK only signaling is prioritized over a half-duplex (HD) or co-channel collision (CC) feedback indication, and uplink transmissions are prioritized over sidelink transmissions. In response to detection of a conflict, the inter-UE coordination feedback is transmitted relative to the slot where the HD or CC event occurs or relative to the slot where reservation of the resources for the sidelink transmissions.