Sidelink Relative Positioning With AoA-Based PRS Resources
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Solution Overview
Problem
Existing wireless communication systems face challenges in rapidly allocating resources for positioning reference signals (PRS) between vehicles moving in dense formations, leading to potential collisions and inefficiencies in V2X communication.
Innovation Solution
A method for determining a PRS pattern and time resource region based on the angle of arrival (AoA) of a received request PRS, allowing for efficient allocation of response PRSs by vehicles, minimizing collisions through precise timing and resource management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If vehicles transmit positioning reference signals in dense formations without AoA-based resource allocation, then communication coverage is maintained, but resource collisions occur and allocation efficiency decreases
Solution Approach 1:
The patent applies local quality by allocating different PRS transmission resources based on the angle of arrival (AoA) measurements. Each vehicle selects a specific time resource region and PRS pattern according to its AoA, creating localized, collision-free transmission opportunities within the dense vehicle formation. This resolves the contradiction by ensuring reliable PRS transmission for each vehicle while improving overall resource allocation efficiency through AoA-based differentiation.
2Reliability
If AoA-based PRS pattern determination is implemented, then resource collision is minimized, but measurement and processing complexity increases
Solution Approach 1:
The patent implements self-service by enabling each vehicle to autonomously determine its own PRS transmission parameters based on AoA measurements. Each vehicle independently measures AoA, selects appropriate time resource regions and PRS patterns, and transmits without requiring centralized coordination. This self-service approach minimizes resource collisions while managing device complexity through distributed, autonomous decision-making rather than complex centralized scheduling.
3Speed
If rapid resource allocation for moving vehicles is performed without AoA information, then system response time is reduced, but positioning accuracy deteriorates
Solution Approach 1:
The patent applies preliminary action by having vehicles perform AoA measurements and prepare PRS transmission parameters in advance before actual PRS transmission. Vehicles measure AoA of request PRS signals, determine appropriate time resource regions and patterns, and prepare transmission configurations beforehand. This preliminary preparation enables rapid resource allocation while maintaining positioning accuracy through pre-computed AoA-based resource selection.
Data Source
AI summary
Disclosed are a method and apparatus for transmitting, by a first terminal, a first positioning reference signal (PRS) for relative positioning in a communication system that supports sidelink communication that supports a sidelink according to various embodiments. Disclosed are a method comprising the steps of: receiving a second PRS requesting transmission of the first PRS from a second terminal; measuring an angle of arrival (AoA) on the basis of the second PRS; determining a first PRS pattern of the first PRS on the basis of the AoA; determining a time resource region in which the transmission of the first PRS is requested on the basis of a second PRS pattern of the second PRS; and transmitting the first PRS on the basis of the first PRS pattern and the determined time resource region, and an apparatus therefor.