Distributed Antenna V2X Positioning Using Signal Arrival Time
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Solution Overview
Problem
Existing V2X communication systems face challenges in accurately estimating the location of devices transmitting signals, leading to suboptimal service provision due to low accuracy in location information, particularly for vulnerable road users (VRUs) with limited position measurement capabilities.
Innovation Solution
A method utilizing multiple distributed antennas to estimate the location of a device by calculating the difference in reception times of signals received across these antennas, allowing for the determination of whether to transmit a second signal for providing V2X services based on threshold times and signal types, thereby improving service accuracy and reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple distributed antennas are deployed to improve location estimation accuracy, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The system segments the location estimation function across multiple distributed antennas rather than using a single complex antenna system. Each antenna independently receives signals and provides measurement data, dividing the overall measurement task into simpler parallel sub-tasks that can be processed separately and combined to achieve high accuracy.
Solution Approach 2:
The patent combines measurement data from multiple distributed antennas to achieve accurate location estimation. By merging the signal reception capabilities of multiple simple antennas and processing their combined data through time difference calculations, the system achieves high measurement precision without requiring each individual antenna to be complex.
2Ease of operation
If location information with low accuracy from VRUs is used directly, then ease of operation is maintained, but reliability of V2X service deteriorates
Solution Approach 1:
The system introduces a Road Side Unit (RSU) as an intermediary that receives low-accuracy position information from VRUs and enhances it by combining with signal measurement data from multiple antennas. The RSU acts as a mediator that transforms unreliable direct position reports into reliable location estimates without requiring changes to the simple VRU transmission protocol.
Solution Approach 2:
The patent replaces reliance on mechanical position sensors in VRUs with a signal-based measurement system. Instead of depending on the VRU's position measurement capabilities, the system uses electromagnetic signal propagation time differences measured by distributed antennas to calculate location, substituting a more reliable physical measurement method.
3Measurement precision
If signal processing based on reception time differences is implemented, then measurement precision is improved, but loss of time in signal processing increases
Solution Approach 1:
The system performs preliminary synchronization and timestamping of signals at the source before transmission. By pre-marking signals with accurate transmission time information and pre-synchronizing the antenna clocks, the system eliminates the need for complex real-time processing during reception, reducing processing time while maintaining precision.
Solution Approach 2:
The patent uses direct time difference of arrival calculations that skip intermediate processing steps. Instead of performing full signal analysis or iterative optimization algorithms, the system directly computes location from reception time differences, rushing through the essential calculation to minimize processing time while achieving sufficient accuracy.
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
This approach enables accurate estimation of VRU positions and minimizes errors in V2X service provision, ensuring optimal service delivery even with low-accuracy position information from VRUs, enhancing safety and communication efficiency.
Implementation Method 1
estimating a location of a device based on a difference in reception times between the plurality of distributed antennas
Data Source
AI summary
According to various embodiments, disclosed are a method for providing a V2X-related service by a device comprising a plurality of distributed antennas in a wireless communication system supporting a sidelink, and a device therefor. Disclosed are a method for providing a V2X-related service by a device comprising a plurality of distributed antennas and a device therefor, the method comprising the steps of: receiving a first signal by each of the plurality of distributed antennas; and determining whether to transmit a second signal for providing the V2X-related service, wherein transmission of the second signal is determined on the basis of a reception time at which the first signal is received between the plurality of distributed antennas and a threshold time.