RIS-Aided Positioning via Capability-Based Signal Adaptation
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Solution Overview
Problem
Current wireless communication systems, particularly in 5G networks, face challenges in accurately positioning user equipment due to variations in capabilities of reconfigurable intelligent surfaces (RIS), which affect beam parameters and phase shift control, leading to inconsistencies in signal processing and positioning techniques.
Innovation Solution
The method involves determining the capability of reconfigurable intelligent surfaces, including phase shift accuracy and power gain, to adapt configuration information for positioning reference signals, and utilizing this information to enhance signal processing and power settings, thereby improving positioning accuracy and coverage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If reconfigurable intelligent surfaces are used to enhance positioning, then positioning coverage and signal availability are improved, but positioning accuracy deteriorates due to variations in RIS capabilities
Solution Approach 1:
The system determines the capability of each RIS (including phase shift accuracy and power gain) and adapts configuration information for positioning reference signals based on these capabilities. This involves changing parameters such as signal power, frequency, timing, and resource allocation to match the specific characteristics of each RIS, thereby maintaining positioning accuracy across diverse RIS deployments while preserving extended coverage benefits
2Use of energy by moving object
If positioning reference signals are transmitted through RIS, then signal availability in coverage areas is improved, but spectral efficiency deteriorates due to inconsistent signal processing
Solution Approach 1:
The base station determines the capability of the RIS and uses this feedback information to adapt the configuration of positioning reference signals. The system receives capability information about phase shift accuracy, power gain, and other RIS characteristics, then adjusts signal transmission parameters accordingly to optimize spectral efficiency while maintaining signal availability through the RIS
3Measurement precision
If capability-based adaptation is implemented for RIS, then positioning accuracy is improved, but device complexity increases due to capability determination and configuration adaptation
Solution Approach 1:
The system performs capability determination of the RIS in advance, before actual positioning operations. The base station determines RIS capabilities (phase shift accuracy, power gain, beam shape) and stores this information for future use. This preliminary action allows the system to have capability information ready when needed, avoiding real-time complexity during positioning operations while still achieving accurate capability-based adaptation
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
This approach enables improved positioning estimates and power management by accounting for the unique capabilities of each RIS, enhancing spectral efficiency and reducing latency in 5G wireless communication systems.
Implementation Method 1
determining an accuracy of a phase shift control of the reconfigurable intelligent surface
Implementation Method 2
determining a beam shape of a beam reflected from the reconfigurable intelligent surface
Data Source
AI summary
Disclosed are techniques for wireless communication, and specifically for reconfigurable intelligent surface (RIS)-aided positioning. An example method of wireless communication performed by a base station includes determining a capability of a RIS, determining configuration information for a positioning reference signal, wherein the configuration information is based at least in part on the capability of the RIS, and transmitting a positioning signal based on the configuration information in a direction of the RIS.