Sidelink Positioning Using Relative AoA and AoD Measurements
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Solution Overview
Problem
Current sidelink positioning methods in cellular networks face challenges in achieving accurate positioning, especially when the target UE is out of coverage or lacks connectivity to base stations, due to limitations in geometry and availability of assisting nodes, leading to reduced accuracy and increased geometric dilution of precision (GDOP).
Innovation Solution
A method for sidelink positioning that involves establishing communication links between nodes to measure relative Angle of Arrival (AoA) and Angle of Departure (AoD) using Positioning Reference Signals (PRS), with resource configuration and allocation in a sidelink communication system to enhance positioning accuracy, even in scenarios with limited or no network coverage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional positioning methods (DL-TDOA, UL-TDOA, OTDOA) are used in sidelink communication, then positioning can be supported in network-covered areas, but positioning accuracy deteriorates when target UE is out of coverage or lacks connectivity to base stations
Solution Approach 1:
The patent introduces positioning reference signals (PRS) as intermediary elements that enable direct sidelink positioning measurements between UEs without requiring base station connectivity. The PRS signals act as mediators carrying positioning information over the sidelink interface, allowing UEs to perform positioning measurements independently of network coverage while maintaining measurement precision comparable to network-based methods.
Solution Approach 2:
The patent enables UEs to perform self-positioning by measuring PRS signals from other UEs directly through sidelink communication. The target UE autonomously measures relative AoA and AoD of PRS signals from neighboring UEs, calculates positioning information without base station assistance, and determines its own position,从而实现 positioning service independence from network coverage.
2Measurement precision
If fewer assisting nodes are available in limited coverage areas, then device complexity is reduced, but geometric dilution of precision increases and positioning accuracy deteriorates
Solution Approach 1:
The patent enables neighboring UEs to serve dual functions: as communication partners for data transmission and as positioning reference nodes for PRS measurements. This multi-functionality allows the same set of UEs to provide both communication and positioning services, effectively increasing the number of available positioning references without requiring additional dedicated infrastructure nodes.
Solution Approach 2:
The patent introduces angular measurements (AoA and AoD) as an additional dimensional parameter beyond traditional time-based measurements. By measuring relative angles in addition to time differences of arrival, the system gains extra geometric constraints that improve positioning accuracy even with fewer assisting nodes, effectively compensating for the reduced quantity of reference points through increased measurement dimensions.
Data Source
AI summary
The present invention relates to a method of positioning a target node (102-4) in a side-link communication system in a wireless communication network (100). The method comprises establishing, by a first node (102-6), a communication link with a second node (102-1 to 102-3) and a third node (102-4). The first node (102-6) measures a relative Angle of Arrival (AoA) and a relative Angle of Departure (AoD) of the third node (102-4) with respect to the second node. The target node is one of the first node, the second node and the third node. The first node (102-6) estimates a position of the third node (102-4) based on at least one of the relative AoA and the relative AoD.