Wireless Positioning Using Combined PRS and Dynamic Allocation
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Solution Overview
Problem
Current wireless communication systems face challenges in accurately determining the location of user equipment (UE) due to variations in signal quality and reliability, particularly in environments with complex propagation conditions, which affects the precision of positioning methods like OTDOA and AoD/AoA measurements.
Innovation Solution
A method and apparatus that combine multiple positioning reference signals (PRSs) to improve positioning accuracy by transmitting and receiving measurement reports on reference signal time differences (RSTDs) and indices, using both OTDOA and AOD measurements, and dynamically adjusting PRS resource allocation based on signal quality thresholds to enhance location estimation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple positioning reference signals (PRSs) are combined to improve positioning accuracy, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent segments the positioning measurement process into distinct components: RSTD measurement for OTDOA positioning and AOD measurement for angle-based positioning. Each measurement type processes specific PRS resources independently, allowing the system to handle multiple positioning methods without overwhelming complexity. The segmentation enables modular processing where each measurement type can be optimized separately.
Solution Approach 2:
The patent implements a universal PRS resource framework where the same PRS resources can serve multiple positioning purposes. The network can configure PRS resources that are simultaneously used for RSTD measurements (OTDOA) and AOD measurements, allowing a single signal infrastructure to support multiple positioning methodologies and improving overall system efficiency.
2Reliability
If PRS resources are allocated dynamically based on signal quality thresholds, then reliability is improved, but use of energy increases
Solution Approach 1:
The patent implements dynamic PRS resource allocation where the network gNB adjusts the configuration and activation of PRS resources based on real-time signal quality conditions. When signal quality exceeds predefined thresholds, additional PRS resources are activated to improve measurement reliability. This dynamic adaptation allows the system to maintain high positioning reliability only when necessary, reducing energy consumption during periods of acceptable signal conditions.
Solution Approach 2:
The system changes operational parameters (PRS resource activation states, measurement configuration) based on signal quality thresholds. When signal quality metrics such as RSRP or SINR exceed predetermined thresholds, the system transitions to a higher reliability mode by activating additional PRS resources and enabling more comprehensive measurement procedures, thereby optimizing the balance between reliability and energy consumption.
3Measurement precision
If both OTDOA and AOD measurements are used for positioning, then measurement precision is improved, but difficulty of detecting and measuring increases
Solution Approach 1:
The patent divides the positioning measurement process into distinct segments: RSTD measurement for OTDOA and AOD measurement. Each segment processes specific PRS resources independently with dedicated algorithms. The network configures separate measurement procedures for each type, allowing the UE to perform measurements in an organized, manageable sequence rather than attempting to process all signals simultaneously, thereby reducing overall measurement difficulty.
Solution Approach 2:
The network gNB acts as an intermediary by providing assistance data that contains pre-calculated information about PRS resources, timing, and frequency configurations for both OTDOA and AOD measurements. This intermediary information helps the UE understand what to measure and how to process the measurements, reducing the complexity of detecting and measuring multiple signal types independently.
Data Source
AI summary
Disclosed are a positioning method in a wireless communication system, and a device for supporting same.