V2X Sidelink Ranging With Time-Difference Feedback
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Solution Overview
Problem
Current vehicle-to-everything (V2X) communication technologies face challenges in accurately measuring distances between vehicles and other objects using sidelink communication to prevent collisions.
Innovation Solution
A ranging method involving a first UE sending a signal and a second UE receiving and responding with a time difference to determine the distance between them, utilizing time stamps and time differences to calculate the round-trip time for distance measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sidelink communication technology is used to measure distance between vehicles and objects, then collision prevention capability is improved, but measurement precision is insufficient
Solution Approach 1:
The patent implements a feedback mechanism where the second UE measures the arrival time of the first signal and sends this timing information back to the first UE. This feedback loop enables both UEs to calculate the time difference of flight (TDF) by comparing their local clocks with the received timing data, thereby achieving precise distance measurement through iterative timing refinement
Solution Approach 2:
The patent replaces traditional mechanical or geometric distance measurement methods with an electromagnetic signal-based timing system. By using radio frequency signals and measuring the time of flight (ToF) and time difference of flight (TDF), the system achieves non-contact, high-precision distance measurement that substitutes physical measurement mechanisms with temporal measurements
2Measurement precision
If time stamps and time differences are used to calculate round-trip time for distance measurement, then distance measurement accuracy is improved, but device complexity increases
Solution Approach 1:
The patent segments the distance measurement process into distinct signaling phases: the first UE sends a ranging signal with its time stamp, the second UE responds with a response signal containing the measured arrival time, and both UEs independently calculate the TDF. This segmentation allows each UE to perform simpler local calculations rather than requiring complex centralized processing
Solution Approach 2:
Each UE autonomously performs timing measurements and distance calculations using its own clock and the received timing information from the other UE. The first UE calculates TDF using its sent time and the received response time, while the second UE similarly calculates using its measured arrival time and sent response time, eliminating the need for external coordination or complex joint processing
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables accurate distance measurement between vehicles and other objects, preventing transportation accidents by providing precise collision avoidance.
Implementation Method 1
determining a distance between the first UE and the second UE according to the first time, the second time, and a first time difference
Implementation Method 2
a difference between a third time at which the second UE sends the second signal and a fourth time at which the second UE receives the first signal
Data Source
AI summary
A ranging method includes: sending a first signal, where a time at which the first signal is sent from a first UE is a first time; receiving a second signal sent by a second UE, where a time at which the second signal reaches the first UE is a second time; and determining a distance between the first UE and the second UE according to the first time, the second time, and a first time difference, where the first time difference is a difference between a third time at which the second UE sends the second signal and a fourth time at which the second UE receives the first signal.