PRS Measurement Window Decoupling for Low-Latency UE Positioning
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently managing positioning reference signal (PRS) measurement windows and processing windows for ultra-reliable low-latency communication (URLLC) and massive machine type communication (MMTC), leading to suboptimal latency and resource utilization.
Innovation Solution
A method and apparatus for a user equipment (UE) that buffers PRS instances during multiple measurement windows and processes them during scheduled processing windows, prioritizing PRS processing over other signals and channels, with a common periodicity for PRS resource repetitions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If PRS instances are processed immediately upon reception, then positioning measurement latency is reduced, but processing accuracy and reliability deteriorate due to insufficient measurement time
Solution Approach 1:
The patent applies preliminary action by buffering multiple PRS instances in advance before processing. The UE receives and stores multiple PRS instances from different TRPs during a measurement window, then processes them together in a processing window. This allows the system to prepare measurement data beforehand and perform accurate processing without rushing, thus reducing overall latency while maintaining reliability.
Solution Approach 2:
The patent segments the PRS measurement process into distinct measurement windows and processing windows. By separating reception and processing into different time segments, the system can optimize each phase independently - receiving PRS instances during measurement windows and processing them during dedicated processing windows - achieving both low latency and high reliability.
2Measurement precision
If PRS processing is prioritized over other signals, then positioning measurement accuracy is improved, but reception and processing of other downlink signals deteriorates
Solution Approach 1:
The patent implements periodic action by allocating specific measurement windows and processing windows at regular intervals. During measurement windows, the UE focuses on receiving PRS instances, and during processing windows, it dedicates resources to processing. This periodic structure ensures that PRS processing receives sufficient attention for accurate positioning measurements while other signals are processed during their designated time slots, maintaining overall system productivity.
3Measurement precision
If multiple PRS instances from multiple TRPs are processed together, then positioning accuracy is improved, but processing complexity and resource requirements increase
Solution Approach 1:
The patent merges multiple PRS instances from different TRPs into a unified processing window. Instead of processing each PRS instance separately, the UE accumulates multiple instances in a buffer and processes them together, leveraging diversity from multiple TRPs to improve positioning accuracy. This combining approach reduces overall processing complexity compared to handling each instance independently while maintaining high measurement precision.
Data Source
AI summary
Disclosed are techniques for wireless positioning. In an aspect, a user equipment (UE) receives a positioning reference signal (PRS) configuration indicating at least one or more PRS resources of one or more PRS resource sets, buffers a plurality of PRS instances during a plurality of PRS measurement windows, and processes the plurality of PRS instances during one or more PRS processing windows to determine one or more positioning measurements for a positioning session based on the plurality of PRS instances, wherein the one or more PRS processing windows are scheduled after an end of a last PRS measurement window of the plurality of PRS measurement windows, and wherein the one or more PRS processing windows each comprise a period of time during which the UE at least prioritizes PRS processing over reception, processing, or both of other downlink or sidelink signals and channels.