V2X Sidelink Timing Alignment Using Autonomous Time Offsets
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Solution Overview
Problem
The existing LTE V2X system's broadcast communication mode leads to lower resource utilization and transmission reliability for large-packet traffic, necessitating a shift towards unicast transmission in NR V2X to enhance spectrum efficiency and reliability, while timing considerations for D2D and V2X unicast transmission need reevaluation.
Innovation Solution
A method for wireless communication that utilizes a first time offset value and a first time-domain resource to align transmissions based on the reference timing of the node itself, avoiding the need for Timing Advance (TA) adjustments and ensuring synchronous timing, applicable to both unicast and multicarrier communications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If broadcast transmission mode is used in LTE V2X system, then communication coverage is provided, but resource utilization and transmission reliability deteriorate for large-packet traffic
Solution Approach 1:
The patent implements dynamic transmission mode selection between broadcast and unicast based on traffic requirements. The system can switch from fixed broadcast mode to adaptive unicast mode when large-packet traffic is detected, allowing transmission parameters to be dynamically adjusted to optimize both reliability and resource utilization for different traffic conditions
Solution Approach 2:
The patent changes the transmission parameter from broadcast to unicast mode specifically for large-packet traffic. This parameter change allows dedicated resource allocation and timing adjustments (using time offset values) that improve transmission reliability while enhancing overall resource utilization by matching transmission characteristics to traffic requirements
2Manufacturing precision
If Timing Advance (TA) adjustments are implemented for uplink transmission alignment, then time synchronization is improved, but device complexity and operation complexity increase
Solution Approach 1:
The patent enables each communication node to independently determine its own transmission timing using time offset values relative to a reference time. This self-service approach eliminates the need for complex TA adjustment mechanisms and base station coordination, reducing device complexity while maintaining precise time synchronization through autonomous timing decisions
Solution Approach 2:
The patent extracts the timing adjustment function from the base station-controlled TA mechanism and implements it locally at each communication node. By taking out the TA adjustment complexity from the network side and replacing it with simple local time offset calculations, the system achieves time synchronization precision without the operational complexity of TA management
3Reliability
If unicast transmission is adopted in NR V2X, then spectrum efficiency and transmission reliability are enhanced, but timing alignment complexity increases for D2D communications
Solution Approach 1:
The patent enables each unicast communication node to autonomously determine transmission timing using time offset values relative to a reference time. This self-service timing mechanism eliminates the need for complex network-coordinated timing alignment procedures, reducing timing alignment complexity while maintaining the reliability benefits of unicast transmission
Solution Approach 2:
The patent introduces time offset values as a simplified timing parameter for unicast D2D communications. This parameter change replaces complex TA-based timing alignment with straightforward offset calculations from a reference time, reducing timing alignment complexity while preserving spectrum efficiency and transmission reliability enhancements of unicast mode
Data Source
AI summary
The present disclosure discloses a method and device used in wireless communication node. A first node receives first information and second information via an air interface, the first information indicating a first time offset value, and the second information indicating a first time-domain resource relative to a first instant of time; the first instant of time is associated with a first time unit. By designing the first time offset value in the present disclosure, whenever a terminal A expects a terminal B to transmit, the terminal B is able to transmit according to a timing obtained by itself and there is no need for multiple interactions between these terminals to acquire a timing advance (TA), thus improving radio signal transmission efficiency on sidelink in IOT and V2X systems and the system's overall performance.