Autonomous V2X Channel Access via Listen Before Talk
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Solution Overview
Problem
Current wireless communication systems, particularly in V2X communications, face challenges in reducing resource collisions and latency due to the lack of network-based control, necessitating improved resource allocation mechanisms that can efficiently manage time-sensitive vehicle-to-vehicle communications.
Innovation Solution
A listen before talk (LBT) based channel access mechanism is introduced, where user equipment (UE) selects a listen before talk counter to wait before transmitting, senses the bandwidth for occupied resource blocks, and then transmits on unoccupied blocks, allowing for sub-slot channel access and reducing collisions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional wireless communication systems are used in V2X communications, then network-based control is maintained, but resource collisions increase and latency increases due to lack of autonomous resource allocation
Solution Approach 1:
The patent implements autonomous resource allocation where user equipment (UE) independently performs listen-before-talk (LBT) procedures and selects time-frequency resources without network-based control. Each UE autonomously senses the channel, determines available resources, and transmits data packets, eliminating resource collisions caused by centralized control limitations in V2X communications.
2Productivity
If autonomous resource allocation is implemented in V2X communications, then latency is reduced and resource utilization improves, but the complexity of channel access mechanisms increases
Solution Approach 1:
The patent segments the bandwidth into multiple frequency resource blocks and divides the time domain into slots and sub-slots. This segmentation allows UEs to independently select specific time-frequency resources for data packet transmission, improving resource utilization and reducing latency by enabling parallel transmissions without requiring complex centralized coordination.
3Reliability
If listen before talk mechanism is used, then resource collisions are reduced, but transmission time increases due to waiting period
Solution Approach 1:
The patent implements a listen-before-talk (LBT) mechanism where each UE performs channel sensing for a predetermined time period before transmitting data packets. By partially sensing the channel rather than continuously monitoring, the system reduces collisions while minimizing the waiting time, achieving a balance between collision-free transmission and transmission delay.
Data Source
AI summary
In a device to device (D2D) communication scenario such as vehicle to anything (V2X) communications, channel access of a device such as a user equipment (UE) may not be controlled by network devices. Using the disclosed channel access mechanism, a device may autonomously access a channel for transportation related communications. A device may determine to transmit a data packet in a portion of bandwidth. The device may select a listen before talk counter defining a time period to wait before beginning a transmission of the data packet. The device may sense the portion of bandwidth during the time period for transmissions of other UEs occupying frequency resource blocks within the portion of bandwidth. The device may select unoccupied frequency resource blocks within the portion of bandwidth based on the sensing. The device may transmit the data packet on the unoccupied frequency resource blocks after the period of time.