Selective PRS Measurement Using Sidelink Post-Measurement Data
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Solution Overview
Problem
Current wireless communication systems, particularly in 5G networks, face challenges in efficiently managing positioning reference signals (PRS) measurements due to the need for precise assistance data and the involvement of multiple devices, which can lead to increased latency and complexity in positioning operations.
Innovation Solution
The method involves a user equipment (UE) receiving positioning assistance data from a location server and post-measurement positioning assistance data from sidelink devices within a threshold distance, allowing for selective measurement of PRS resources based on the received data, thereby optimizing PRS measurement processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the UE measures all PRS resources independently without assistance data, then measurement completeness is improved, but measurement time and latency increase significantly
Solution Approach 1:
The location server performs preliminary measurements of PRS resources and generates assistance data containing measurement results and quality indicators before the UE performs measurements. This preliminary action allows the UE to selectively measure only promising PRS resources, significantly reducing measurement time and latency while maintaining measurement completeness.
2Measurement precision
If the UE receives and processes assistance data from multiple sources including sidelink devices, then positioning accuracy is improved, but device complexity and processing overhead increase
Solution Approach 1:
The location server acts as an intermediary that collects assistance data from multiple sources including satellite networks and sidelink devices, processes this data centrally, and delivers consolidated assistance information to the UE. This intermediary approach improves positioning accuracy by aggregating multiple data sources while reducing UE complexity by centralizing the complex processing at the server side.
3Productivity
If the UE selectively measures PRS resources based on post-measurement assistance data, then positioning speed is improved, but measurement reliability may be compromised
Solution Approach 1:
The location server provides post-measurement assistance data containing quality indicators and measurement results from preliminary measurements as feedback to the UE. The UE uses this feedback to selectively measure only PRS resources that meet quality thresholds, achieving both fast positioning speed and reliable measurements by avoiding poor-quality resources.
Data Source
AI summary
In an aspect, a user equipment (UE) may receive positioning assistance data from a location server, wherein the positioning assistance data identifies one or more first positioning reference signal (PRS) resources for measurement by the UE during a positioning session between the UE and a location server. The UE may receive post-measurement positioning assistance data from at least one sidelink device located within a threshold distance to the UE, wherein the post-measurement positioning assistance data received from the at least one sidelink device is based on measurements of one or more second PRS resources obtained by the at least one sidelink device during a positioning session of the at least one sidelink device. The UE may selectively measure at least a subset of the one or more first PRS resources based on the post-measurement positioning assistance data received from the at least one sidelink device.