V2X Contention Pool Allocation for Priority-Based Resource Segmentation
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Solution Overview
Problem
Current LTE-based V2X communication systems face challenges in reducing collisions during contention-based uplink transmission, particularly for high-priority messages, which can lead to increased latency and delay in critical situations like emergencies, due to the lack of differentiation in processing event-triggered and periodic messages.
Innovation Solution
Implementing a contention pool allocation mechanism that distinguishes between different types of V2X messages based on priority, allocating separate physical resources and channels for high-priority messages, such as event-triggered messages, to reduce collisions and enhance transmission efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If contention-based uplink transmission is used for V2X communications, then latency is reduced and transmission speed is improved, but collision probability increases and reliability deteriorates
Solution Approach 1:
The contention pool is segmented into multiple priority levels (first priority, second priority, etc.), with each priority level having its own dedicated physical resources and channels. This segmentation allows high-priority V2X messages to use separate resources from low-priority messages, reducing collision probability while maintaining fast transmission for critical communications.
Solution Approach 2:
Different physical resources and transmission parameters are allocated to different priority levels. High-priority messages receive preferential treatment with dedicated resources and optimized parameters, while low-priority messages use remaining resources. This local quality differentiation ensures reliable fast transmission for critical V2X communications while efficiently utilizing overall system resources.
2Reliability
If separate physical resources are allocated for different priority levels, then collision probability is reduced and reliability is improved, but device complexity and resource management complexity increase
Solution Approach 1:
The infrastructure equipment pre-configures and broadcasts the priority-based resource allocation scheme to all communications devices before V2X communications occur. Each device is provided with predetermined physical resources and transmission parameters for different priority levels, eliminating the need for complex real-time negotiations and reducing device complexity during actual message transmission.
Solution Approach 2:
Communications devices autonomously determine the priority level of their V2X messages and independently select the appropriate physical resources and transmission parameters based on pre-configured information. This self-service mechanism reduces the need for complex centralized resource management while ensuring reliable transmission for high-priority messages.
Data Source
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AI summary
A communications device is provided for transmitting a message to an infrastructure equipment of a mobile communications network, the communications device comprising: a transmitter configured to transmit signals via a wireless access interface provided by the infrastructure equipment, a receiver configured to receive signals from the infrastructure equipment via the wireless access interface, and a controller configured to control the transmitter and the receiver to transmit and/or receive the signals, the controller being configured with the receiver to receive an indication of an allocation of physical resources of the wireless access interface providing plurality of different physical channels of different types, each of the different types of physical channels being defined for transmitting messages in accordance with a different priority level using a contentious access technique, the allocation of the physical resources being dependent upon the priority of the message and the contentious access technique, and the controller is configured with the transmitter to identify a relative priority for transmitting one or more of the messages to the infrastructure equipment, to select one of the physical channels in accordance with the identified relative priority, and to transmit the message via the select physical channel, wherein the message is transmitted via the selected physical channel in accordance with the contentious access technique determined for the selected physical channel provided by the received indication.