Backscatter Positioning with Frequency Shifting for Interference Control
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Solution Overview
Problem
Existing wireless communication networks face interference issues due to self-interference and interference from neighboring transmitters, which degrade performance and network congestion, particularly when incorporating RFID tag devices with 3GPP technologies for IoT applications.
Innovation Solution
Implement frequency shifting and phase scrambling techniques for backscatter signals transmitted by tag devices to mitigate interference and improve positioning accuracy, using a tag configuration based on frequency and phase capabilities of the tag devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If backscatter signals are transmitted by tag devices for positioning, then positioning capability is enabled, but interference from extraneous signals degrades measurement accuracy
Solution Approach 1:
The patent applies parameter changes by modifying the frequency and phase characteristics of backscatter signals. The network entity configures tag devices with specific frequency shifts and phase scrambling parameters to differentiate tagged signals from extraneous interference, thereby improving positioning measurement accuracy in noisy environments.
Solution Approach 2:
The network entity acts as an intermediary that coordinates between tag devices and receiving devices. It provides configuration information including frequency shifting parameters and phase scrambling parameters to tag devices, and corresponding reference signal configurations to receiving devices, enabling synchronized interference-mitigated positioning measurements.
2Measurement precision
If frequency shifting and phase scrambling techniques are applied to backscatter signals, then interference is reduced and positioning accuracy is improved, but device complexity increases
Solution Approach 1:
Tag devices with limited capabilities perform self-service by applying pre-configured frequency shifts and phase scrambling to their backscatter signals. The network entity provides the necessary configuration parameters, and tag devices autonomously apply these transformations without requiring complex real-time processing or additional hardware components.
3Use of energy by moving object
If tag devices with limited power and processing capabilities are used for positioning, then energy consumption is reduced, but positioning precision deteriorates
Solution Approach 1:
The patent enables precise positioning with low-power tag devices by changing the signal parameters at the network level rather than requiring complex processing at the tag level. Frequency shifting and phase scrambling are configured by the network entity, allowing simple tag devices to transmit distinguishable signals that maintain high positioning precision without increasing their power consumption or processing capabilities.
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 precision of RFID tag devices by reducing interference from extraneous signals, enabling effective location determination despite limited power and computational resources.
Implementation Method 1
a tag device transmitting a backscatter signal in response to a positioning reference signal
Implementation Method 2
The tag configuration includes a frequency shifting parameter based on a frequency shifting capability of a tag device
Implementation Method 3
The tag configuration includes a phase scrambling parameter based on a phase scrambling capability of the tag device
Data Source
AI summary
Systems, methods, and devices for wireless communication that support backscatter-based positioning. A method of wireless communication includes receiving a tag device indicator that indicates a tag capability of a tag device. The method also includes generating a tag configuration associated with transmission of a backscatter signal based on a positioning reference signal (PRS). The tag configuration indicates a frequency shifting parameter based on a frequency shifting capability of a tag device, a phase scrambling parameter based on a phase scrambling capability of the tag device, or a combination thereof. The method further includes transmitting the tag configuration.