V2X UE Link Selection for Resource Collision Reduction
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Solution Overview
Problem
Current V2X communication systems face challenges in urban areas with high vehicle density, leading to unstable ITS services due to high utilization of sidelink resources and increased collision probability, as well as requirements for lower latency and fast broadcast mechanisms in V2V and V2I communications.
Innovation Solution
A method for performing switching control between uplink (UL) and sidelink (SL) for V2X communication, where the transmission direction between UL and SL is selected based on priority and conditions, allowing for dynamic selection of transmission links to optimize resource usage and latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sidelink resources are used for V2X communication in high vehicle density areas, then direct vehicle-to-vehicle communication is enabled, but resource utilization becomes unstable and collision probability increases
Solution Approach 1:
The patent introduces a base station as an intermediary node to relay V2X messages when sidelink resource utilization exceeds a threshold. Instead of direct UE-to-UE communication over congested sidelink, messages are transmitted through the base station using uplink and downlink resources, thereby reducing sidelink collision probability while maintaining communication reliability.
Solution Approach 2:
The patent implements dynamic switching between sidelink and uplink/downlink transmission modes based on real-time sidelink resource utilization conditions. When utilization is low, direct sidelink communication is used; when utilization exceeds threshold, the system dynamically switches to base station relay mode, adapting to changing traffic conditions to optimize reliability and reduce collisions.
2Speed
If sidelink transmission is used for V2V communication, then direct communication between vehicles is achieved, but latency increases in high density scenarios
Solution Approach 1:
The base station acts as a mediator that can efficiently manage and forward V2X messages in high-density scenarios. By utilizing the base station's processing capabilities and backhaul connectivity, messages can be rapidly distributed to multiple vehicles, reducing end-to-end latency compared to direct sidelink transmission in congested environments.
Solution Approach 2:
The system dynamically selects the transmission path (direct sidelink or base station relay) based on real-time conditions including vehicle density and latency requirements. This dynamic path selection ensures that time-critical messages are transmitted through the lowest-latency available path, improving overall communication speed.
3Reliability
If infrastructure assistance is used for V2X communication, then coverage and reliability are improved, but system complexity increases
Solution Approach 1:
The base station performs multiple functions: it serves as a relay for V2X messages, manages resource allocation for both sidelink and uplink/downlink transmissions, and monitors sidelink utilization conditions. This multi-functionality reduces the need for separate dedicated infrastructure components, managing complexity while maintaining improved reliability through infrastructure assistance.
4Productivity
If dynamic link selection is implemented based on priority and conditions, then resource utilization is optimized, but control complexity increases
Solution Approach 1:
The user equipment autonomously monitors sidelink resource utilization conditions and independently decides whether to use sidelink or request base station relay based on pre-configured thresholds and message priority. This self-service approach eliminates the need for complex centralized control algorithms, optimizing resource utilization through simple local decision-making rules.
Solution Approach 2:
The system uses simple parameter-based decision rules (comparing current sidelink utilization against threshold values and considering message priority levels) to determine transmission mode. This parameter-driven approach simplifies control complexity compared to complex optimization algorithms, while still achieving efficient resource utilization through adaptive link selection.
Data Source
AI summary
Provided are a method for transmitting data performed by a user equipment (UE) comprising an upper layer, a switching layer and a lower layer in a wireless communication system and the UE using the same. The method includes receiving, in the switching layer, data from the upper layer, assigning a priority to the data in the switching layer, selecting a link among a plurality of links in the switching layer and transmitting, in the lower layer, the data using the selected link. Here, the link is selected based on the assigned priority of the data.