RIS-Aided Positioning Using Reflected PRS for Obstructed Coverage
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Solution Overview
Problem
The challenge in 5G wireless communication systems is to enhance spectral efficiency, support a large number of simultaneous connections, and reduce latency, particularly in positioning UE devices using existing reference signals.
Innovation Solution
The introduction of a reconfigurable intelligent surface (RIS) that reflects positioning reference signals (PRS) to improve signal coverage and accuracy, enabling UE devices to measure downlink reference signal time difference (RSTD) more effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional direct transmission of positioning reference signals is used, then the system structure is simple, but positioning accuracy and coverage are insufficient in obstructed environments
Solution Approach 1:
A reconfigurable intelligent surface (RIS) is introduced as an intermediary component between the base station and user equipment. The RIS reflects positioning reference signals to provide alternative signal paths through obstructed environments, thereby improving positioning accuracy without significantly increasing system complexity. The RIS acts as a mediator that enables signal propagation in scenarios where direct transmission is blocked.
2Measurement precision
If reconfigurable intelligent surface is introduced to improve positioning accuracy, then positioning accuracy and coverage are enhanced, but system complexity increases
Solution Approach 1:
The reconfigurable intelligent surface dynamically adjusts reflection parameters such as phase shift and amplitude to optimize signal propagation for positioning. By changing these parameters adaptively, the system improves positioning accuracy while managing complexity through controlled reconfiguration rather than permanent structural complexity.
3Area of stationary object
If multiple signal paths including RIS reflection are used, then positioning coverage is improved, but signal measurement and processing becomes more difficult
Solution Approach 1:
The system employs feedback mechanisms where the base station receives RSTD measurements from user equipment and uses this information to optimize RIS configuration and signal transmission. This feedback loop helps manage the complexity of measuring multiple signal paths by iteratively improving measurement quality and selecting optimal paths for positioning calculations.
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
Enhances positioning accuracy and coverage by optimizing signal reflection, thereby improving spectral efficiency and reducing latency in 5G wireless networks.
Implementation Method 1
transmitting, to a reconfigurable intelligent surface (RIS) configured to reflect a received signal to the UE, a second PRS
Data Source
AI summary
Disclosed are techniques for wireless communication, and specifically for reconfigurable intelligent surface (RIS)-aided positioning. In some aspects, a base station (BS) may transmit, to a user equipment (UE), a first positioning reference signal (PRS). The BS may transmit, to RIS configured to reflect a received signal towards the UE, a second PRS. The BS may receive, from the UE, a downlink reference signal time difference (RSTD) measurement for the first PRS and the second PRS.