Time-Domain DL-PRS Processing for Mobile Positioning
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Solution Overview
Problem
Current positioning techniques in wireless communications, specifically for User Equipment (UE), face high computational costs due to frequency-domain processing of Downlink Positioning Reference Signals (DL-PRS), which can drain battery life and hinder user experience.
Innovation Solution
Implementing time-domain processing of DL-PRS signals under specific conditions, such as reduced interference and a search time window that meets a threshold, to reduce computational complexity and improve battery life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If frequency-domain processing is used for DL-PRS signals, then positioning accuracy is maintained, but computational cost increases and battery life decreases
Solution Approach 1:
The patent dynamically selects between time-domain and frequency-domain processing based on real-time conditions including location uncertainty estimates and interference levels. When location uncertainty is low and interference is reduced, time-domain processing is used to save energy. When location uncertainty is high or interference is present, frequency-domain processing is used to maintain positioning accuracy, thus adaptively optimizing the trade-off between energy consumption and positioning precision
Solution Approach 2:
The patent changes the processing domain parameter from fixed frequency-domain to variable selection between time-domain and frequency-domain based on measured conditions. By monitoring location uncertainty estimates and interference levels, the system switches processing methods to optimize the balance between computational cost and positioning accuracy
2Measurement precision
If frequency-domain processing is used for DL-PRS signals, then positioning capability is ensured, but computational complexity increases
Solution Approach 1:
The patent implements dynamic method selection where the processing approach changes based on operational conditions. Time-domain processing with reduced search windows is used when conditions permit, reducing computational complexity. Frequency-domain processing is activated only when necessary to maintain positioning capability, thus reducing overall system complexity while ensuring capability when needed
3Productivity
If reduced search time window is used for time-domain processing, then computational cost decreases, but positioning accuracy may be compromised under high interference
Solution Approach 1:
The patent employs feedback mechanisms by continuously monitoring interference levels and location uncertainty estimates to determine the appropriate processing method. When interference is low and uncertainty is small, reduced search windows in time-domain processing provide sufficient accuracy with higher efficiency. When interference increases or uncertainty grows, the system switches to frequency-domain processing to maintain accuracy, thus using feedback to optimize the trade-off between efficiency and precision
Data Source
AI summary
Techniques are provided for time-domain processing of DL-PRS signals under certain conditions in which time-domain processing has a computational advantage over frequency-domain processing. Because of this, embodiments can provide positioning at a lower computational cost than positioning provided by traditional techniques utilizing only frequency-domain processing. This reduced computational cost can improve the battery life of mobile devices, ultimately resulting in a better user experience.