Hybrid Active-Backscatter PRS Positioning for Communication Devices
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Solution Overview
Problem
Existing communication systems face challenges in accurately positioning devices using ambient power (AMP) devices, particularly when combining active and backscatter transmission modes, which can lead to positioning inaccuracies due to non-co-located transmitters and receivers and complex RF link requirements.
Innovation Solution
A method involving a first-type device transmitting a first-type PRS using active transmission and a second-type device transmitting a second-type PRS using backscatter mode, allowing the first terminal to determine its position using both signals, with timing and frequency adjustments to align and orthogonalize the signals for improved accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If both active transmission mode and backscatter mode are used for PRS transmission, then positioning accuracy is improved, but device complexity increases
Solution Approach 1:
The system segments the PRS transmission function into two distinct modes: active transmission mode (first-type device) and backscatter mode (second-type device). This segmentation allows each device type to be optimized for its specific transmission method, improving overall positioning accuracy while managing device complexity through functional division.
Solution Approach 2:
The positioning system is designed to universally support both active transmission and backscatter modes within the same network infrastructure. The first terminal can receive and process PRS from both types of devices, making the system multi-functional and adaptable to different device capabilities without requiring separate positioning systems.
2Measurement precision
If timing and frequency adjustments are applied to align PRS signals, then positioning accuracy is improved, but signal processing complexity increases
Solution Approach 1:
The system performs preliminary timing and frequency adjustments on the PRS signals before they reach the positioning calculation stage. By pre-aligning the signals from active and backscatter devices, the system reduces the computational burden during positioning and improves accuracy without requiring complex real-time processing.
Solution Approach 2:
The system dynamically adjusts timing and frequency parameters of the PRS signals to optimize alignment between active and backscatter transmissions. By changing these parameters in advance and maintaining them during transmission, the system achieves high positioning accuracy while keeping processing complexity manageable through parameter optimization rather than complex algorithms.
3Use of energy by moving object
If backscatter mode is used for PRS transmission, then power consumption is reduced, but positioning accuracy may deteriorate
Solution Approach 1:
The system merges the PRS transmissions from both active mode devices (first-type) and backscatter mode devices (second-type) into a unified positioning framework. By combining the signals and measurements from both transmission modes, the system achieves accurate positioning while allowing energy-constrained devices to use the lower-power backscatter mode without sacrificing overall system accuracy.
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
Enhances positioning accuracy and reduces power consumption by coordinating active and backscatter PRS transmissions, suitable for low-cost and high-accuracy applications in various communication systems.
Implementation Method 1
the first-type PRS is transmitted by a first-type device using an active transmission mode
Implementation Method 2
the second-type PRS is transmitted by a second-type device using a backscatter mode
Data Source
AI summary
Provided is a method for wireless communication. The method is performed by a first terminal, and includes: receiving a first-type positioning reference signal (PRS) and a second-type PRS, wherein the first-type PRS is transmitted by a first-type device using an active transmission mode, the second-type PRS is transmitted by a second-type device using a backscatter mode, and the first-type PRS and the second-type PRS are used to determine position information of the first terminal.