NR V2X Sidelink Preemption Control for Inter-UE Collisions
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Solution Overview
Problem
In New Radio (NR) Vehicle-to-Everything (V2X) mode 1 shared carrier scenarios, collisions between dynamically scheduled or configured sidelink transmissions and dynamically scheduled very low latency or high priority downlink/uplink transmissions can lead to degradation or failure, necessitating mechanisms to handle these inter-UE collisions.
Innovation Solution
Implementing mechanisms to detect and manage inter-UE collisions through explicit or implicit preemption indications and retransmission scheduling, power reduction, or cancellation of sidelink transmissions to prioritize high-priority communications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If dynamic scheduling is used for sidelink transmissions on shared carriers, then resource utilization and flexibility are improved, but inter-UE collisions with high-priority downlink/uplink transmissions occur causing degradation or failure
Solution Approach 1:
The gNB acts as an intermediary by monitoring the shared carrier and sending preemption indications to UEs when high-priority downlink or uplink transmissions are scheduled. This mediator resolves the conflict between sidelink and Uu interface transmissions by coordinating resource usage and preventing collisions before they occur.
Solution Approach 2:
The system performs preliminary scheduling actions by the gNB to allocate resources for high-priority downlink or uplink transmissions before sidelink transmissions occur. The gNB sends preemption indications in advance to UEs that have scheduled sidelink transmissions, allowing them to preempt or adjust their transmissions before the collision actually happens.
2Reliability
If sidelink transmissions are preempted to prioritize high-priority downlink/uplink transmissions, then communication reliability for critical traffic is improved, but sidelink transmission failures increase
Solution Approach 1:
The system changes transmission parameters dynamically by adjusting the priority levels and resource allocations based on the type of traffic. High-priority downlink and uplink transmissions are assigned parameters that give them precedence over sidelink transmissions, while sidelink transmissions can be adjusted or preempted when necessary, changing the operational parameters of the communication system in real-time.
3Reliability
If inter-UE collision handling mechanisms are implemented, then transmission failure rate is reduced, but system complexity increases
Solution Approach 1:
The gNB serves as a central coordinator that simplifies the collision handling complexity by centralizing the decision-making process. Instead of requiring complex distributed algorithms at each UE, the gNB monitors the shared carrier and sends simple preemption indications to UEs, reducing the computational complexity at the UE level while maintaining reliable collision handling.
Data Source
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AI summary
An electronic device that is configured to schedule transmission of data to at least one other electronic device via sidelink resources in a wireless communication network; identify that the scheduled transmission of the data is preempted by another transmission occurring within at least a part of the sidelink resources; and control transmission of the data to at least one other electronic device based on the identifying.