Adaptive On-Demand Positioning via Dynamic PRS Activation
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Solution Overview
Problem
Existing downlink (DL) and uplink (UL) positioning methods in wireless communication protocols face challenges in efficiently utilizing positioning reference signals (PRS) and adapting to changing wireless transmit/receive unit (WTRU) locations.
Innovation Solution
A wireless transmit/receive unit (WTRU) is configured to perform adaptive on-demand positioning by transmitting adaptive PRS activation requests. The WTRU determines metrics associated with transmission-reception points (TRPs) not initially configured for PRS reception and sends activation requests with these metrics, allowing for dynamic adjustment of PRS configurations based on location and measurement data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the WTRU is configured to receive PRS from a fixed first set of TRPs, then the positioning system has stable configuration, but it cannot adapt to changing WTRU locations and may miss better positioning opportunities from other TRPs
Solution Approach 1:
The patent implements dynamic PRS configuration where the WTRU can request activation of additional TRPs based on its current location and positioning needs. The network dynamically activates or deactivates TRPs in response to WTRU requests, transforming the static configuration into an adaptive system that evolves with WTRU movement and positioning requirements.
Solution Approach 2:
The WTRU provides feedback to the network about its location and positioning quality, which triggers requests to activate additional TRPs. The network responds to this feedback by dynamically adjusting the PRS configuration, creating a closed-loop system that continuously optimizes positioning based on actual performance and WTRU movement.
2Measurement precision
If the WTRU requests activation of additional TRPs dynamically, then positioning accuracy improves, but signaling overhead and latency increase
Solution Approach 1:
The WTRU pre-calculates metrics for candidate TRPs before requesting activation. By preparing the metric information in advance based on current location and signal measurements, the WTRU reduces the time needed for the network to evaluate and activate additional TRPs, minimizing positioning latency while maintaining accuracy.
Solution Approach 2:
The patent changes the parameter of TRP activation state from static to dynamic based on positioning quality metrics. When positioning accuracy falls below a threshold or location changes significantly, the system activates additional TRPs; when accuracy is sufficient, it deactivates them, optimizing the balance between precision and response time.
3Measurement precision
If the WTRU continuously monitors and requests PRS activation from multiple TRPs, then positioning accuracy improves, but energy consumption increases
Solution Approach 1:
The WTRU performs partial monitoring by evaluating metrics for candidate TRPs only when positioning accuracy falls below a threshold or location changes significantly, rather than continuously monitoring all possible TRPs. This selective approach maintains positioning accuracy while significantly reducing energy consumption compared to continuous monitoring.
Solution Approach 2:
The WTRU autonomously evaluates positioning quality and decides when to request additional TRP activation based on pre-configured criteria. By implementing self-service decision-making with threshold-based triggers, the WTRU avoids energy-intensive continuous monitoring while ensuring positioning accuracy is maintained through targeted requests.
4Adaptability or versatility
If the network activates PRS from all potential TRPs, then positioning coverage is maximized, but network resource utilization efficiency decreases
Solution Approach 1:
The network extracts only the necessary TRPs for activation based on WTRU requests and current positioning needs, rather than activating all potential TRPs. By selectively activating only those TRPs that the WTRU indicates are needed for improved positioning, the network maximizes coverage where required while maintaining high resource utilization efficiency by leaving other TRPs inactive.
Data Source
AI summary
A WTRU may be configured to perform adaptive on-demand positioning. The WTRU may receive configuration information for receiving positioning signals (PRSs) from a first set of one or more TRPs. For example, the configuration information may comprise PRS configuration information associated with each of the first set of TRPs. The WTRU may determine a metric (e.g., a weight, rank, etc.) associated with TRP that is not included in the first set of one or more TRPs. For example, the metric may be determined (e.g., using an AI/ML model) based on: a location associated with the TRP, a location associated with the WTRU, and/or a measurement associated with the TRP. The WTRU may send a PRS activation request to activate PRS from the TRP. For example, the PRS activation request may indicate the PRS configuration that the WTRU requests be activated, and a metric associated with that PRS configuration.