Backscatter Tag Positioning With PRS-Based RTT Separation
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Solution Overview
Problem
Existing wireless communication networks face interference and congestion due to the integration of RFID tag devices with 3GPP technologies, particularly in IoT implementations, leading to network overhead and limited utilization of network resources.
Innovation Solution
Implementing backscatter-based positioning techniques using positioning reference signals (PRS) to determine the round trip time (RTT) of RFID tag devices, configuring them with unique tag configurations and training sequences to differentiate and measure their positions, even with limited computational and power resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If RFID tag devices are integrated with 3GPP technologies for positioning, then positioning capability is improved, but network interference and congestion increase
Solution Approach 1:
The patent segments the positioning process by assigning unique tag configurations and training sequences to different RFID tag devices. This segmentation allows the network to differentiate between multiple tags, enabling accurate positioning while managing network interference through organized signal separation.
Solution Approach 2:
The patent changes signal parameters by using different training sequences and tag configurations for different RFID tags. These parameter variations enable the network to distinguish between multiple devices, improving positioning accuracy while controlling interference through parameter diversity.
2Measurement precision
If multiple RFID tag devices are configured with unique tag configurations for positioning, then positioning accuracy is improved, but network overhead increases
Solution Approach 1:
The patent implements a universal tag configuration framework where a single configuration message from the network can manage multiple RFID tag devices simultaneously. This multi-functional approach reduces network overhead by consolidating positioning management while maintaining unique configurations for each tag to ensure positioning accuracy.
3Use of energy by moving object
If backscatter signals are used for positioning measurement, then power consumption is reduced, but signal differentiation becomes more difficult
Solution Approach 1:
The patent applies preliminary action by pre-configuring unique training sequences and tag configurations in the backscatter signals before positioning measurement. This preliminary differentiation embedded in the signals makes it easier for the network to distinguish between multiple low-power backscatter signals from different RFID tags.
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
Facilitates accurate positioning of RFID tag devices with reduced interference and improved network resource utilization, enhancing network access and reducing congestion.
Implementation Method 1
receiving, from a first tag device, a first backscatter signal based on the PRS, and receiving, from a second tag device, a second backscatter signal based on the PRS
Data Source
AI summary
This disclosure provides systems, methods, and devices for wireless communication that support backscatter-based positioning. In a first aspect, a method of wireless communication includes transmitting a tag configuration message that indicates a first tag configuration and a second tag configuration. The method also includes transmitting a positioning reference signal (PRS). The method also includes receiving, from a first tag device, a first backscatter signal based on the PRS, and receiving, from a second tag device, a second backscatter signal based on the PRS. The method includes transmitting a measurement report that indicates a first round trip time (RTT) of the first tag device, and a second RTT of the second tag device. The first RTT is based on the first tag configuration and the first backscatter signal, and the second RTT is based on the second tag configuration and the second backscatter signal.