On-Demand PRS Configuration for Wireless Positioning
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Solution Overview
Problem
Current semi-static configured positioning parameters in wireless communication systems do not allow for the achievement of high accuracy and low latency required for positioning, necessitating methods for dynamic re-configuration of reference signals.
Innovation Solution
A method where a wireless transmit/receive unit (WTRU) can request a dynamic and on-demand re-configuration of positioning reference signals (PRS) based on specific criteria such as RSRP, TDoA, number of multipaths, accuracy, and latency, allowing for improved positioning performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If semi-static configured positioning parameters are used, then system complexity is reduced, but positioning accuracy and latency performance deteriorate
Solution Approach 1:
The patent implements dynamic PRS configuration where the WTRU can request re-configuration of positioning reference signals based on real-time measurement criteria. The configuration transitions from static to dynamic, allowing the WTRU to send on-demand PRS requests when positioning accuracy requirements are not met, thereby resolving the contradiction between maintaining simple configuration and achieving high positioning accuracy.
Solution Approach 2:
The system changes PRS configuration parameters dynamically based on measurement results. When the WTRU determines that positioning accuracy criteria are not satisfied, it triggers a re-configuration request that modifies PRS parameters such as bandwidth, frequency resources, or time resources, thus improving positioning accuracy without requiring complete reconfiguration of the system.
2Loss of time
If semi-static PRS configuration is used, then signaling overhead is reduced, but positioning latency increases
Solution Approach 1:
The patent implements a periodic evaluation mechanism where the WTRU continuously monitors positioning measurement criteria and periodically determines whether re-configuration is needed. This periodic action allows the system to maintain low latency by only initiating re-configuration when necessary, rather than using continuous signaling, thus balancing latency reduction with overhead control.
Solution Approach 2:
The WTRU autonomously monitors its own positioning measurement criteria and self-determines when re-configuration is needed based on predefined thresholds. This self-service mechanism eliminates the need for continuous network-side monitoring and signaling, reducing configuration overhead while maintaining low positioning latency through timely re-configuration decisions.
3Measurement precision
If dynamic re-configuration of PRS is enabled, then positioning accuracy improves, but signaling overhead increases
Solution Approach 1:
The patent implements a feedback-based re-configuration mechanism where the WTRU measures positioning criteria, compares results against thresholds, and only triggers re-configuration requests when accuracy requirements are not met. This feedback loop ensures that signaling overhead is incurred only when necessary to improve positioning accuracy, rather than continuously, thus resolving the contradiction between accuracy improvement and overhead reduction.
Solution Approach 2:
The system applies partial re-configuration only when and where needed based on measurement criteria violations. Instead of continuously re-configuring PRS parameters, the WTRU triggers re-configuration only for specific parameters and only when positioning accuracy falls below thresholds, thus achieving accuracy improvement with minimal signaling overhead.
4Adaptability or versatility
If on-demand PRS requests are transmitted, then positioning performance adapts to real-time requirements, but device complexity increases
Solution Approach 1:
The WTRU autonomously monitors positioning measurement criteria and self-determines when re-configuration is needed based on predefined thresholds. This self-service mechanism enables real-time adaptability without requiring complex external control systems, as the device independently makes re-configuration decisions based on its own measurement results and criteria evaluations.
Solution Approach 2:
The system implements dynamic adaptability where the WTRU can request PRS re-configuration based on real-time positioning requirements. The configuration adapts dynamically to changing conditions through on-demand requests, providing versatility while maintaining manageable device complexity through standardized procedures and predefined criteria.
Data Source
AI summary
A method performed by a WTRU may comprise receiving PRS configuration information and performing a first set of measurements based on the PRS configuration. The method may further comprise determining whether to trigger an on-demand PRS request based on the first set of measurements and on-demand PRS criteria. On a condition that the determining to trigger is affirmative, transmitting an on-demand PRS request. In embodiments, the on-demand PRS criteria may be based on an RSRP, TDoA, number of multipaths, accuracy and/or latency.