Multi-DRX PRS Bundling Using Wake-Up Signals for 5G Positioning
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Solution Overview
Problem
The challenge in 5G wireless communication systems is to efficiently manage positioning reference signal (PRS) measurements across multiple discontinuous reception (DRX) groups while minimizing interruptions and optimizing resource utilization.
Innovation Solution
The implementation of positioning reference signal bundling across multiple DRX groups, utilizing wake-up signals (WUS) to coordinate the behavior of DRX cycles and align PRS measurements, thereby reducing interruptions and enhancing signaling efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If PRS bundling is applied within a single DRX group, then positioning measurement accuracy is improved, but positioning reliability deteriorates when UE moves between DRX groups due to missed PRS occasions
Solution Approach 1:
The patent segments the DRX operation into multiple independent DRX groups (first DRX group and second DRX group), each with its own PRS bundling configuration. This allows the UE to perform positioning measurements in one DRX group while another DRX group handles mobility tasks, thereby resolving the contradiction between measurement accuracy and reliability during mobility.
Solution Approach 2:
The patent dynamically configures different PRS bundling parameters (such as prs-BundlingPattern and prs-BundlingOffset) for different DRX groups based on UE mobility state. When UE is stationary, aggressive bundling is applied for high accuracy; when UE is mobile, the system switches to a different DRX group configuration that prioritizes reliability. This dynamic adaptation resolves the fixed trade-off between accuracy and reliability.
2Reliability
If PRS bundling pattern is configured to achieve frequent PRS occasions for mobile UE, then positioning reliability is improved, but positioning measurement accuracy deteriorates due to reduced bundling benefit
Solution Approach 1:
The patent divides the positioning function into two separate DRX groups: one optimized for accuracy with aggressive PRS bundling (fewer, more bundled PRS occasions), and another optimized for reliability with less bundling (more frequent PRS occasions). The UE can switch between groups or use both, thereby achieving both high reliability and high accuracy simultaneously through functional segmentation.
Solution Approach 2:
The patent makes the DRX system multi-functional by configuring different DRX groups with different PRS bundling characteristics. One DRX group serves the accuracy function while another serves the reliability function. This universal design allows the same UE to achieve both competing objectives by utilizing different parts of the segmented system for different purposes.
Data Source
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AI summary
Disclosed are techniques for wireless communication. In an aspect, a user equipment (UE) configured to operate in discontinuous reception (DRX) mode receives a configuration of a plurality of DRX groups, receives one or more positioning reference signal (PRS) configurations for the plurality of DRX groups, each of the one or more PRS configurations indicating one or more PRS resources for each of the plurality of DRX groups, receives one or more wakeup signals (WUS) for the plurality of DRX groups, the one or more WUS indicating whether or not the UE is expected to wake up for a next DRX cycle of each of the plurality of DRX groups, and measures/transmits the one or more PRS resources for each of the plurality of DRX groups during the next DRX cycle of each of the plurality of DRX groups based, at least in part, on the one or more WUS.