Multi-Frequency PDOA Positioning for Indoor Wireless Devices
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Solution Overview
Problem
There is a demand for alternatives to satellite-based positioning in mobile devices due to the unavailability of GNSS coverage in indoor environments, power consumption requirements, and electronic complexity of GNSS receivers.
Innovation Solution
A method and system for a wireless transmit/receive unit (WTRU) configured to communicate through a zero energy (ZE) interface, which receives a first positioning reference signal (PRS) resource, determines its suitability, measures the phase difference of arrival (PDOA) for available frequency pairs, and generates a range estimate using multi-frequency (MF)-PDOA measurements. The WTRU evaluates the reliability and accuracy of the measurements and requests a second PRS resource if the first is not suitable or if the measurements are not reliable or accurate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If satellite-based GNSS positioning is used, then positioning accuracy is improved, but device power consumption increases and electronic complexity increases
Solution Approach 1:
The patent replaces the mechanical/electronic GNSS receiver system with a signal processing approach that uses existing cellular infrastructure (downlink reference signals) and simple phase difference measurements. Instead of requiring complex GNSS hardware, the system uses software-based PDOA measurement and multi-frequency processing to achieve positioning functionality with minimal electronic complexity and power consumption.
Solution Approach 2:
The patent introduces downlink reference signals as an intermediary between the cellular network and the positioning function. These reference signals serve as a mediator that enables positioning without requiring direct satellite visibility or complex receiver hardware. The network transmits reference signals that the device measures to derive positioning information, eliminating the need for expensive GNSS receivers.
2Measurement precision
If satellite-based GNSS positioning is used, then positioning accuracy is improved, but device electronic complexity increases
Solution Approach 1:
The patent replaces the mechanical/electronic GNSS receiver system with a signal processing approach that uses existing cellular infrastructure (downlink reference signals) and simple phase difference measurements. Instead of requiring complex GNSS hardware, the system uses software-based PDOA measurement and multi-frequency processing to achieve positioning functionality with minimal electronic complexity and power consumption.
Solution Approach 2:
The patent extracts the essential positioning function from the complex GNSS receiver by isolating the core measurement capability (phase difference of arrival) and implementing it using simple cellular signal processing. This extraction allows positioning functionality to be achieved without the bulky and complex GNSS receiver hardware, reducing device electronic complexity while maintaining positioning accuracy.
3Reliability
If GNSS coverage is used, then positioning availability is improved, but availability deteriorates in indoor environments
Solution Approach 1:
The patent introduces downlink reference signals as an intermediary between the cellular network and the positioning function. These reference signals serve as a mediator that enables positioning without requiring direct satellite visibility or complex receiver hardware. The network transmits reference signals that the device measures to derive positioning information, eliminating the need for expensive GNSS receivers.
Solution Approach 2:
The patent segments the positioning function into network-side reference signal transmission and device-side measurement processing. By separating these functions, the system can leverage existing cellular network infrastructure (which provides indoor coverage) to deliver positioning services, making positioning available in indoor environments where GNSS is unavailable.
4Measurement precision
If multiple frequency pairs are measured for MF-PDOA, then range estimation accuracy is improved, but measurement time increases
Solution Approach 1:
The patent performs preliminary actions by pre-configuring the device with multiple frequency pairs and pre-processing algorithms before actual positioning measurements are needed. The device maintains readiness to perform rapid MF-PDOA measurements by having the necessary computational resources and signal processing chains pre-established, enabling accurate range estimation without significant time delay when positioning is required.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution enables accurate and reliable range estimation in environments where traditional GNSS positioning is unavailable, while also considering power consumption and electronic complexity limitations.
Implementation Method 1
measuring the phase difference of arrival (PDOA) for at least one of available frequency pairs and generating a range estimate based on a multi-frequency (MF)-PDOA measurement
Data Source
AI summary
A method for use in a wireless transmit/receive unit (WTRU) configured to communicate through a zero energy (ZE) interface in accordance with an embodiment disclosed herein is provided. The method includes the WTRU receiving, a first positioning reference signal (PRS) resource with parameters characterizing the first PRS and determining the suitability of the first PRS resource for use by the WTRU. The method also includes measuring the phase difference of arrival (PDOA) for available frequency pairs and generating a range estimate based on the PDOA measurement. Further, the method includes the WTRU evaluating a reliability of the PDOA measurement and an accuracy of the range estimate and, on a condition that a sufficient accuracy has been achieved, reporting the range estimate