RIS-Assisted RTT Positioning for Accurate UE Distance Estimation
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Solution Overview
Problem
Existing wireless communication systems, particularly in the context of 5G, face challenges in accurately determining the position of user equipment (UE) due to limitations in time difference measurements and the lack of efficient methods for utilizing reconfigurable intelligent surfaces (RIS) in RTT-based positioning.
Innovation Solution
A method and system that utilizes RIS to enhance RTT-based UE positioning by measuring Tx-Rx and Rx-Tx time differences, enabling accurate distance calculations between UE and RIS based on these measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional time difference measurement methods are used for UE positioning, then the positioning system is simple to implement, but the positioning accuracy deteriorates in complex wireless environments
Solution Approach 1:
The patent introduces RIS (reconfigurable intelligent surface) as an intermediary component in the positioning system. The RIS assists in measuring time differences between transmissions and receptions by providing a controlled reflection path, thereby improving measurement precision without requiring direct complex interactions between all system components
Solution Approach 2:
The patent segments the positioning function into multiple components: the RIS handles signal reflection and time difference measurement, while the network entity performs calculation and determination. This segmentation allows each component to specialize in specific tasks, improving overall measurement precision while distributing system complexity across modular elements
2Measurement precision
If RIS is integrated into RTT-based positioning, then positioning accuracy in complex environments improves, but the device complexity increases
Solution Approach 1:
The RIS serves multiple functions: it reflects positioning signals, assists in time difference measurement, and can be configured for different operation modes. This multi-functionality improves measurement accuracy while avoiding the need for separate dedicated components, thereby managing system complexity more effectively
Solution Approach 2:
The RIS autonomously performs signal reflection and measurement assistance without requiring constant external control or complex coordination with other system elements. This self-service capability improves measurement precision while reducing the complexity of system coordination and control mechanisms
Data Source
AI summary
Disclosed are techniques for positioning. In an aspect, a positioning entity receives a report indicating an operation mode of a reconfigurable intelligent surface (RIS) associated with at least one base station, receives a transmission-to-reception (Tx-Rx) time difference measurement for a network node involved in a round-trip-time (RTT) positioning session with a user equipment (UE), determines a reception-to-transmission (Rx-Tx) time difference measurement for the UE, the Rx-Tx time difference measurement representing a difference between a reception time at the UE of a downlink positioning reference signal from the RIS and a transmission time from the UE of an uplink positioning reference signal towards the RIS, and calculates a distance between the UE and the RIS based, at least in part, on the Tx-Rx time difference measurement and the Rx-Tx time difference measurement.