Distributed Antenna Sidelink Positioning
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Solution Overview
Problem
Existing positioning systems, such as satellite-based systems, face challenges in urban areas and areas with poor signal reception, necessitating alternative methods for accurate location determination of user equipment like cellular phones or wireless communication devices.
Innovation Solution
A distributed antenna system using vehicle-to-everything (V2X) sidelink communications within the intelligent transportation systems (ITS) frequency spectrum, where positioning reference signals are received and processed by multiple antennas on a vehicle or roadside unit to determine time of arrival differences and relative locations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If satellite positioning system (SPS) is used to determine location, then positioning accuracy is improved, but availability deteriorates in urban canyons or areas with poor satellite signal reception
Solution Approach 1:
The patent introduces terrestrial base stations as intermediary objects to mediate positioning when satellite signals are unavailable. Base stations transmit positioning reference signals that user equipment can receive directly, serving as a mediator between the positioning system and the user equipment in urban environments where satellite signals are blocked
Solution Approach 2:
The patent changes the signal source parameter from satellite-based to terrestrial-based positioning. By switching from SPS signals to base station transmitted positioning reference signals, the system adapts to environments where satellite signals are unavailable, maintaining positioning functionality through parameter change
2Reliability
If terrestrial based positioning using base station signals is used, then availability is improved in urban areas, but positioning accuracy deteriorates compared to SPS
Solution Approach 1:
The patent segments the base station into multiple distributed antennas positioned at different locations. By receiving positioning reference signals from multiple spatially separated antennas, the system can perform more accurate position calculations through signal comparison and time difference of arrival measurements, improving accuracy while maintaining terrestrial-based availability
3Measurement precision
If multiple antennas at different locations are used to receive positioning reference signals, then positioning accuracy is improved through time of arrival difference measurement, but device complexity increases
Solution Approach 1:
The patent makes the distributed antenna system multi-functional by enabling it to perform both communication functions and positioning functions. The same base station infrastructure provides both services, eliminating the need for separate dedicated positioning hardware and reducing overall system complexity while maintaining positioning 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
Enables accurate location determination even in areas with poor satellite signal reception by using V2X sidelink communications and distributed antenna systems, improving positioning accuracy and reliability in urban environments.
Implementation Method 1
determining a time of arrival based on the positioning reference signal received on the first antenna... determining a second time of arrival based on the positioning reference signal received on the second antenna
Data Source
AI summary
Techniques are provided for sidelink positioning with a single anchor using distributed antenna systems. An example method for determining relative locations of two stations includes determining a first round trip time for positioning reference signals transmitted between a first station and a first antenna of a second station, determining a second round trip time for the positioning reference signals transmitted between the first station and a second antenna of the second station, wherein the first antenna and the second antenna are disposed in different locations proximate to the second station, and determining relative locations of the first station and the second station based at least in part on the first round trip time and the second round trip time.