Low-Power Positioning Reference Signals for 5G Receiver Accuracy
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Solution Overview
Problem
Existing wireless communication systems, particularly 5G NR, face challenges in optimizing power consumption and positioning accuracy for low-power receivers (LPRs) while maintaining efficient resource utilization.
Innovation Solution
Implementing a low-power positioning reference signal (LP-PRS) system with a low-power wake-up signal (LP-WUS) to reduce power consumption and enhance positioning accuracy, utilizing a low-power receiver (LP-WUR) for efficient measurement of LP-PRSs, and a configuration mechanism involving network nodes like TRPs and LMFs for coordinated signal transmission and measurement reporting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a low-power receiver (LPR) is used to reduce power consumption, then energy efficiency is improved, but positioning measurement capability is degraded
Solution Approach 1:
The patent divides the receiver into two separate radios: a first radio (HPR) with full measurement capability and a second radio (LPR) with limited capability. The HPR handles complex positioning measurements while the LPR performs simplified measurements, allowing the device to use the low-power receiver for positioning without completely sacrificing measurement capability. This segmentation resolves the contradiction by distributing measurement tasks across different receiver types.
Solution Approach 2:
The patent modifies the positioning reference signal parameters by introducing a simplified reference signal specifically designed for the LPR's limited measurement capability. The signal parameters are adjusted to match the LPR's processing constraints, enabling the low-power receiver to perform positioning measurements effectively. This parameter adaptation allows the LPR to maintain positioning functionality while consuming less power.
2Measurement precision
If a high-power receiver (HPR) is used to maintain measurement capability, then positioning accuracy is improved, but power consumption increases
Solution Approach 1:
The patent segments the measurement tasks between two radios, allowing the HPR to be used selectively rather than continuously. The LPR handles routine positioning measurements, while the HPR is activated only when enhanced measurement capability is needed. This segmentation allows the system to maintain positioning accuracy when necessary while reducing overall power consumption by relying on the LPR for standard operations.
Solution Approach 2:
The patent introduces a measurement coordination mechanism that acts as an intermediary between the two radios and the positioning system. This coordinator determines which radio should perform measurements based on current positioning requirements and power management considerations. The intermediary optimizes the use of both radios, ensuring positioning accuracy is maintained while minimizing power consumption by appropriately selecting which receiver is active.
Data Source
AI summary
A first or a second network node may transmit, to a first radio at a user equipment (UE), assistance data that may include a configuration of a set of low-power (LP) positioning reference signals (LP-PRSs). The UE may receive, via the first radio, the assistance data. The first network node may transmit, to a second radio at the UE, the set of LP-PRSs. The UE may receive, via the second radio, the set of LP-PRSs. The second radio may have a lower power consumption than the first radio. The first network node may transmit an LP wake-up signal (LP-WUS) including an indication to measure the set of LP-PRSs. The UE may receive, via the second radio, the LP-WUS. The UE may measure the set of LP-PRSs based on the configuration of the set of LP-PRSs and in response to receiving the LP-WUS.