PRS Configuration Alignment With DRX/eDRX for Low-Power Positioning
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Low power high accuracy positioning (LPHAP) user devices face challenges in optimizing power consumption during positioning by aligning positioning reference signal (PRS) configurations with discontinuous reception (DRX)/enhanced DRX (eDRX) configurations in RRC inactive and/or RRC idle states, leading to unnecessary ramp-up/ramp-down power consumption.
Innovation Solution
Methods and systems for aligning PRS configurations with DRX/eDRX configurations by exchanging alignment information between user devices and location management functions (LMF) or radio access nodes, including PRS time offsets, durations, periodicities, and reception window configurations, to optimize power usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If PRS configuration is aligned with DRX/eDRX configuration in time domain, then power consumption is reduced by eliminating ramp-up/ramp-down power usage, but configuration complexity and alignment requirements increase
Solution Approach 1:
The user device performs preliminary actions by determining its own DRX/eDRX configuration parameters (such as DRX cycle, eDRX cycle, PTW configuration) before initiating positioning procedures. This preliminary determination allows the device to proactively align PRS configuration with its reception schedule, avoiding the need for reactive adjustments and reducing overall configuration complexity despite the increased alignment requirements.
2Use of energy by moving object
If PRS reception is performed during RRC inactive/idle states with aligned configuration, then power saving is improved, but positioning accuracy may be affected due to reduced reception opportunities
Solution Approach 1:
The system dynamically adjusts PRS configuration parameters based on the user device's operational state and positioning requirements. The location management function can modify PRS periodicity, time offsets, and reception windows to match the device's DRX/eDRX cycle, enabling the device to maintain positioning accuracy while operating in power-saving modes. This dynamic adaptation allows the system to optimize the balance between power saving and measurement precision according to actual needs.
3Ease of operation
If alignment information is exchanged between user device and LMF/RAN node, then configuration alignment is achieved, but signaling overhead and processing requirements increase
Solution Approach 1:
The user device performs self-service by autonomously determining its own DRX/eDRX configuration parameters and PRS reception requirements. The device independently calculates optimal alignment parameters and communicates only the essential alignment information to the location management function, significantly reducing the signaling overhead and processing complexity compared to full configuration exchange scenarios.
Data Source
AI summary
This document generally relates to wireless communication that includes a user device that sends to a location management function (LMF), alignment information, wherein the alignment information comprises at least one of: a positioning reference signal (PRS) time offset, a PRS time duration, a PRS period index, one or more PRS periodicities, a discontinuous reception (DRX) configuration, an extended DRX (eDRX) configuration, a paging time window (PTW) configuration, or a PRS reception window configuration. The user device receives a PRS configuration according to the alignment information. In addition or alternatively, a radio access node (RAN) node receives from a LMF, a request of alignment information, wherein the alignment information comprises at least one of: a DRX configuration, an eDRX configuration, or a PRS reception window configuration. The RAN node reports to the LMF, the alignment information, and the RAN node transmits a PRS corresponding to the alignment information.