RIS-Aided DL-PRS Measurement for 5G Positioning
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Solution Overview
Problem
Current 5G wireless communication systems face challenges in achieving enhanced spectral efficiency, reduced latency, and improved signaling efficiency, particularly in supporting a large number of simultaneous connections and diverse wireless communication systems.
Innovation Solution
The implementation of a user equipment (UE) that can measure and differentiate between two types of downlink positioning reference signals (DL-PRS), one received directly from a transmission/reception point and another via a reconfigurable intelligent surface (RIS), allowing for adaptive measurement and reporting based on quality thresholds, and the use of these signals in uplink positioning reference signals with distinct transmission characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the UE measures both direct and RIS-reflected DL-PRS signals, then positioning accuracy is improved, but measurement complexity and processing overhead increase
Solution Approach 1:
The patent segments the DL-PRS measurement process into two distinct types: direct measurements from TRP and RIS-reflected measurements. The UE is configured to measure type-1 DL-PRS directly and type-2 DL-PRS via RIS, with separate measurement procedures and reporting mechanisms for each type, thereby managing complexity through structured division while maintaining high positioning accuracy
Solution Approach 2:
The patent implements dynamic measurement selection where the UE adaptively chooses between measuring direct or RIS-reflected DL-PRS based on reception quality thresholds. When direct signal quality falls below the threshold, the UE switches to measuring RIS-reflected signals, providing dynamic adaptability that maintains positioning accuracy while optimizing processing resources
2Measurement precision
If the UE prioritizes higher-quality measurements, then positioning accuracy is improved, but measurement time and latency increase
Solution Approach 1:
The patent applies preliminary action by establishing quality thresholds for direct DL-PRS reception before measurement begins. The UE pre-configures threshold values and immediately compares received signal quality against these thresholds, enabling rapid determination of whether to measure direct or RIS-reflected signals without iterative searching, thus reducing measurement latency while ensuring high-quality measurements
Solution Approach 2:
The patent implements skipping by allowing the UE to bypass measurement of lower-quality direct DL-PRS signals when quality thresholds are not met. Instead of attempting multiple measurement attempts or exhaustive searching, the UE skips directly to measuring RIS-reflected DL-PRS signals, reducing unnecessary processing time and latency while maintaining measurement quality
3Productivity
If the system supports multiple simultaneous connections and diverse wireless systems, then network capacity is improved, but signaling overhead and complexity increase
Solution Approach 1:
The patent applies universality by creating a unified DL-PRS measurement framework that handles both direct and RIS-reflected signals through a single configurable mechanism. The same measurement procedures, threshold comparisons, and reporting structures are used regardless of signal type or wireless system (5G NR, LTE, Wi-Fi), enabling the system to support multiple simultaneous connections and diverse wireless systems without proportionally increasing signaling complexity
Solution Approach 2:
The patent uses parameter changes by configuring different quality thresholds for different wireless systems and signal types. The network can adjust threshold parameters dynamically based on deployment scenarios, signal conditions, and system requirements, allowing flexible support for multiple connections and diverse systems while managing signaling overhead through parameter optimization rather than structural complexity
Data Source
AI summary
A positioning reference signal measuring method includes: transmitting, from a UE, a capability report indicating that the UE is configured to measure a first type of DL-PRS and a second type of DL-PRS; and measuring the first type of DL-PRS received directly from a TRP or the second type of DL-PRS received from the TRP via a RIS, or a combination thereof.