NR V2X Priority Determination via UL Threshold
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Solution Overview
Problem
In wireless communication systems, particularly in V2X scenarios, there is a challenge in efficiently prioritizing sidelink (SL) transmission over uplink (UL) transmission to ensure reliable and low-latency communication, especially when both types of transmissions overlap in time, affecting the performance of Vehicle-to-Everything (V2X) services such as vehicle platooning, advanced driving, and remote driving.
Innovation Solution
A method is proposed where a user equipment (UE) determines priority for sidelink transmission based on a pre-configured threshold related to uplink transmission, allowing it to perform either SL or UL transmission depending on the priority and threshold values, thereby optimizing resource allocation and preventing data failure in collision scenarios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If SL transmission is prioritized over UL transmission to ensure reliable V2X communication, then reliability and latency are improved, but resource allocation complexity increases
Solution Approach 1:
The patent changes the parameter of transmission priority by introducing a threshold mechanism. When SL priority is higher than the threshold, SL transmission is executed; otherwise, UL transmission is executed. This parameter-based decision rule simplifies the resource allocation complexity while ensuring reliable V2X communication by dynamically adjusting transmission priorities based on configured thresholds.
Solution Approach 2:
The UE autonomously determines whether to perform SL or UL transmission by comparing the SL priority with the threshold without requiring continuous network intervention. This self-service mechanism reduces the complexity of centralized resource allocation while maintaining reliable V2X communication through local decision-making based on pre-configured thresholds.
2Loss of time
If SL transmission is performed over UL transmission in collision scenarios, then latency is reduced for V2X services, but data loss in UL transmission increases
Solution Approach 1:
The patent introduces a threshold parameter that determines the conditions under which SL transmission overrides UL transmission. By configuring appropriate threshold values, the system balances the reduction of V2X latency with the prevention of excessive UL data loss, allowing SL to be prioritized only when necessary rather than unconditionally.
Solution Approach 2:
The transmission priority is made dynamic through the threshold mechanism. The UE dynamically selects between SL and UL transmission based on real-time comparison of SL priority against the threshold, rather than using a fixed priority scheme. This dynamic approach reduces V2X latency when needed while preserving UL data transmission when SL priority is lower than the threshold.
Data Source
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AI summary
Proposed is a method for operating a first device (100) in a wireless communication system. The method may comprise the steps of: determining priority associated with sidelink, SL, transmission; receiving, from a base station, information on an SL threshold value associated with uplink (UL) transmission; and performing one of the SL transmission and the UL transmission on the basis of the priority associated with the SL transmission and the SL threshold value.