Terminal Positioning Using Neighbor PRS for Low-Latency Accuracy
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Solution Overview
Problem
Existing wireless communication systems face challenges in accurately determining the position of terminals, particularly in scenarios involving increased data traffic and the need for enhanced mobile broadband communication, where reliability and latency are critical, such as in vehicle-to-everything (V2X) communication.
Innovation Solution
A method and apparatus for positioning in a wireless communication system that involves receiving and processing positioning reference signals (PRS) from a serving and neighbor base stations, along with cell ID information, to estimate the location of a terminal, and transmitting this information to the serving base station.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional positioning methods are used in wireless communication systems, then the positioning can be performed with basic infrastructure, but the positioning accuracy and precision are insufficient for enhanced mobile broadband and V2X communication requirements
Solution Approach 1:
The system performs preliminary actions by pre-configuring PRS resources, neighbor base station information, and measurement parameters before positioning is needed. The location management function prepares assistance data including PRS configuration of neighbor base stations in advance, so that when positioning is required, the terminal can immediately use these pre-prepared resources to achieve high-precision positioning without delays or additional complexity during the actual positioning event.
2Measurement precision
If multiple base stations and PRS signals are used to improve positioning accuracy, then the positioning precision increases, but the calculation time and latency increase
Solution Approach 1:
The location management function prepares assistance data including PRS configuration of neighbor base stations in advance before positioning is requested. This preliminary preparation includes gathering cell ID information, PRS resource configurations, and timing information, so that when positioning is needed, the terminal can immediately perform measurements without waiting for data collection, significantly reducing positioning latency while maintaining high precision through multi-base station measurements.
Solution Approach 2:
The positioning process is segmented into distinct phases: assistance data preparation by the location management function, PRS signal reception and measurement by the terminal, and location calculation. This segmentation allows parallel processing where the terminal receives multiple PRS signals from different base stations simultaneously, and the system can process measurements from multiple sources concurrently, reducing overall positioning time while improving accuracy through diverse measurement inputs.
3Measurement precision
If beam alignment and mmWave considerations are incorporated into positioning, then the positioning accuracy in high-frequency systems improves, but the system complexity and processing requirements increase
Solution Approach 1:
The PRS (Positioning Reference Signal) is designed to serve multiple functions simultaneously: it provides both beam alignment information for mmWave communication and positioning data for location estimation. The same signal structure and measurement procedures are used for both purposes, eliminating the need for separate beam management and positioning systems. This multi-functionality reduces overall system complexity while enabling high-precision positioning in mmWave systems with beamforming.
Data Source
AI summary
Provided is a method for operating a terminal in a wireless communication system, the method comprising: receiving, from a serving base station, a location request message including at least one of positioning reference signal (PRS) information of a neighbor base station and cell ID information of the neighbor base station; receiving a PRS of the serving base station from the serving base station; receiving a PRS from the neighbor base station based on the received location request message; estimating a location of the terminal based on the PRS received from the serving base station and the PRS received from the neighbor base station; and transmitting the estimated location of the terminal to the serving base station.