RIS-Assisted Wireless Positioning Signal Association
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Solution Overview
Problem
In the current NR positioning system, the signal reflected through RIS can interfere with the positioning reference signal, leading to inaccurate positioning of the UE and reduced performance of the NR positioning system.
Innovation Solution
A method is introduced where a first node determines whether the reception of a first reference signal is used for positioning by checking if it is associated with a first radio resource, and adjusts accordingly to improve positioning accuracy and reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If RIS technology is deployed to enhance coverage and beamforming gain, then system coverage and transmission rank are improved, but positioning accuracy deteriorates due to signal reflection interference
Solution Approach 1:
The patent identifies that RIS-reflected signals interfere with positioning reference signals, degrading positioning accuracy. The solution converts this harmful interference into a beneficial situation by configuring the RIS to reflect different reference signals (CSI-RS for channel estimation, SSB for synchronization) through separate spatial paths, thereby eliminating the interference while maintaining the coverage enhancement benefits of RIS technology
Solution Approach 2:
The patent segments the reference signal resources into different types (CSI-RS and SSB) with distinct spatial configurations. By assigning different spatial relations to different reference signal types, the system separates the functions of channel estimation and synchronization, preventing the reflected signal from interfering with positioning measurements while preserving RIS coverage enhancement
2Reliability
If RIS units are configured to reflect positioning reference signals, then signal coverage is enhanced, but positioning reliability deteriorates due to spatial characteristic confusion
Solution Approach 1:
The patent applies local quality by configuring different spatial characteristics for different reference signals based on their specific functions. CSI-RS resources are configured with spatial relations optimized for channel estimation, while SSB resources use spatial relations optimized for synchronization and positioning, ensuring each signal type receives the appropriate spatial treatment for its purpose
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 solution optimizes positioning performance in RIS scenarios, enhances system resistance to interference, and improves the accuracy and reliability of location information, while also reducing power consumption and hardware complexity.
Implementation Method 1
RIS is an artificial electromagnetic surface structure with programmable electromagnetic properties, containing a large number of independent low-cost passive sub-wavelength resonant units. Each RIS unit has independent electromagnetic wave modulation capability, and the response of each unit to radio signals, such as phase, amplitude, polarization, etc., can be controlled by changing the parameters and spatial distribution of the RIS units. Through the superposition of wireless response signals of a large number of RIS units, specific beam propagation characteristics are formed on the macro level
Data Source
AI summary
The present application discloses a method and device in a node for wireless communications. A first node receives a first signaling and a second signaling, wherein the first signal is used to configure a first RS resource, and a first radio resource depends on the second signaling; receives a first reference signal in the first RS resource; the first RS resource is used for positioning, and whether a reception for the first reference signal is used for positioning depends on whether the first reference signal is associated with the first radio resource; a transmitter of the first signaling is different from a transmitter of the second signaling, and a transmitter of the second signaling is the same as a transmitter of the first reference signal. The present application improves the performance of NR positioning in RIS scenarios.