Pre-emption Message Transmission for NR V2X Sidelink Reliability
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Solution Overview
Problem
In wireless communication systems, particularly in Next Generation Radio (NR) sidelink and Vehicle-to-Everything (V2X) communications, there is a need for a method to transmit pre-emption messages to ensure high-priority sidelink data and control information are transmitted efficiently without resource overlap, addressing the challenge of managing resource allocation and priority in multi-user environments.
Innovation Solution
The method involves transmitting pre-emption messages on Hybrid Automatic Repeat Request (HARQ) feedback resources, allowing user equipment (UEs) to determine whether to reselect resources based on the received message, ensuring non-overlapping resource usage for high-priority sidelink information transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pre-emption messages are transmitted on HARQ feedback resources, then high-priority sidelink communication reliability is improved, but resource allocation complexity increases
Solution Approach 1:
The patent applies preliminary action by transmitting pre-emption messages before the actual high-priority sidelink data transmission. The first UE sends the pre-emption message on HARQ feedback resources to notify the second UE of the upcoming high-priority transmission, allowing the second UE to preemptively reschedule its own transmission to avoid resource overlap. This advance notification mechanism ensures reliable high-priority communication while managing resource allocation complexity through protocol-defined procedures.
2Productivity
If resource reservation is implemented for sidelink communication, then communication efficiency is improved, but the risk of resource overlap and interference increases
Solution Approach 1:
The patent implements feedback through the pre-emption message transmission mechanism. When the first UE has high-priority data to transmit, it sends a pre-emption message on the HARQ feedback resources to inform the second UE of the impending resource occupation. The second UE receives this feedback and reschedules its transmission accordingly. This feedback loop enables efficient resource reservation while preventing resource overlap and interference through coordinated resource management.
3Reliability
If pre-emption messages are transmitted on HARQ feedback resources, then high-priority information transmission is protected, but latency in resource reallocation may increase
Solution Approach 1:
The patent reduces latency by applying preliminary action - the pre-emption message is transmitted in advance before the actual data transmission begins. This allows the second UE to preemptively reschedule its transmission rather than reacting after overlap is detected. The pre-emption message includes necessary information (such as priority indicators and resource details) that enable immediate action, minimizing the time loss while ensuring reliable protection of high-priority information transmission.
Data Source
AI summary
An operating method of a first device (100) in a wireless communication system and a device for supporting same are provided. The method can comprise a step of transmitting, on a hybrid automatic repeat request (HARQ) feedback resource, a preemptive message to a second device (200). The preemptive message can comprise information related to the transmission of first sidelink information by the first device (100).