PRS Reception in DRX Cycles for Low-Power NR Positioning
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently supporting positioning procedures for reduced capacity devices, such as wearable devices and unmanned aerial vehicles, due to limitations in power consumption and network connectivity.
Innovation Solution
Implementing group-based positioning techniques, where a delegate UE performs positioning procedures with network entities, and configuring UEs to switch between different DRX cycles and PRS configurations based on timers and network configurations to optimize power consumption and connectivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If reduced capacity devices perform individual positioning procedures with network entities, then positioning accuracy is improved, but power consumption increases
Solution Approach 1:
Multiple UEs are grouped together and share a common positioning reference signal configuration. The network entity performs positioning measurements for the group collectively, combining the positioning procedures of multiple devices into a single operation that reduces overall power consumption while maintaining positioning accuracy for each UE in the group.
2Measurement precision
If reduced capacity devices continuously monitor positioning reference signals, then positioning accuracy is improved, but battery life decreases
Solution Approach 1:
The positioning reference signal monitoring is performed periodically rather than continuously. The network configures periodic positioning occasions where UEs wake up to receive positioning reference signals and then return to sleep mode, achieving a balance between maintaining positioning accuracy and conserving battery life through intermittent monitoring cycles.
Solution Approach 2:
A single positioning reference signal configuration serves multiple UEs simultaneously within a group. The network entity uses the same positioning reference signal resources for measuring positions of multiple devices, allowing each UE to achieve positioning functionality while sharing the measurement burden, thereby extending battery life.
3Measurement precision
If the network configures individual positioning procedures for each UE, then positioning precision is improved, but network complexity increases
Solution Approach 1:
The network consolidates positioning configuration and measurement operations by grouping multiple UEs together. Instead of managing individual positioning procedures for each device, the network entity handles group-based positioning with shared reference signal configurations, reducing network complexity while maintaining positioning precision through coordinated group measurements.
Data Source
AI summary
Apparatuses, systems, and methods for positioning procedures for reduced capacity devices, e.g., in 5G NR systems and beyond. A UE, operating in an RRC connected mode, may enter, upon expiration of a timer, a DRX cycle. The UE may switch to a first positioning reference signal (PRS) configuration corresponding to a first periodic wakeup cycle of the DRX cycle. The UE may enter, upon expiration of a timer associated with a first portion of the DRX cycle corresponding to the first periodic wakeup cycle, a second portion of the DRX cycle corresponding to the second periodic wakeup cycle. The UE may switch from the first PRS configuration to a second PRS configuration, e.g., upon the expiration of the timer and/or upon entering the second portion of the DRX cycle. The second PRS configuration may correspond to a second periodic wakeup cycle of the DRX cycle.