Power and Time Delay Profile Report for Mobile Device Positioning
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Solution Overview
Problem
Existing location determination methods using cellular networks, such as RTT measurements, suffer from inaccuracy due to multipath propagation, which affects the precision of mobile device positioning.
Innovation Solution
The method involves a mobile device sending a power and time delay profile report to a network entity, which selects a suitable reference signal for location estimation using RTT measurements, incorporating additional parameters like transmit beam and sensor information through a fusion algorithm.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If RTT measurements are used for device positioning, then location determination can be achieved, but measurement precision deteriorates due to multipath propagation
Solution Approach 1:
The patent extracts and removes multipath signals from the received signal by analyzing the power delay profile. The network entity identifies and excludes signal components that have undergone multipath propagation, using only the direct line-of-sight signal components for RTT measurement, thereby eliminating the harmful effect of multipath propagation on positioning accuracy
Solution Approach 2:
The patent performs preliminary analysis of the power delay profile before conducting RTT measurements. The network entity pre-processes the received signal to identify and characterize multipath components, preparing clean measurement data in advance to ensure accurate location determination free from multipath interference
2Measurement precision
If power and time delay profile reporting is implemented, then location determination accuracy improves, but device complexity increases
Solution Approach 1:
The patent makes the network entity perform multiple functions: it processes power delay profile reports, selects appropriate reference signals, performs RTT measurements, and determines device location. By consolidating these functions in the network entity rather than requiring complex processing at the device, the system achieves high accuracy while keeping device complexity manageable
Solution Approach 2:
The patent introduces a power delay profile report as an intermediary data structure that carries essential information from the device to the network entity. This intermediary enables accurate location determination by providing the network entity with detailed signal characteristics without requiring the device to perform complex processing
Data Source
AI summary
Techniques are provided for reporting, by a device, positioning-related information to a network entity. In an example, the device receives signaling information of the network entity. The signaling information indicates one or more parameters for a report on a reference signal that is transmitted by a base station. The device also receives multiple propagations of the reference signal upon a transmission of the reference signal by the base station. Based on the signaling information, the device generates the report, where the report comprises a power and a time delay per propagation of the reference signal. The device transmits the report to the network entity, where a position of the device is determined by the network entity based on the report.