Mobility-Adaptive Frame Formats for Spectrum-Efficient Wireless Sensing
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Solution Overview
Problem
Existing wireless sensing technologies face inefficiencies in spectrum and power usage due to periodic or continuous signal transmissions, leading to interference with communication networks and reduced spectral efficiency, especially in decentralized networks with multiple devices.
Innovation Solution
Adaptive frame design based on mobility scenarios, utilizing non-linear chirp signals like hyperbolic frequency modulated (HFM) chirps to decouple range and velocity estimation, allowing for efficient resource allocation and reduced interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If periodic or continuous signal transmissions are used for wireless sensing, then sensing coverage and detection capability are improved, but spectrum efficiency deteriorates and interference with communication networks increases
Solution Approach 1:
The patent applies periodic action by using pulsed radar signals instead of continuous transmissions. The sensing system transmits signals in periodic pulses with controlled duty cycles, allowing the target to be illuminated intermittently. This periodic transmission pattern maintains sensing detection capability while significantly improving spectrum efficiency and reducing interference with communication networks, as the spectrum is shared in time between sensing and communication operations.
2Adaptability or versatility
If multiple wireless devices perform sensing in decentralized networks, then sensing coverage and application versatility are improved, but mutual interference and resource contention increase
Solution Approach 1:
The patent implements feedback mechanisms where wireless devices exchange sensing parameters, channel state information, and interference levels. Based on this feedback, devices dynamically adjust their transmission power, pulse timing, and waveform characteristics to minimize mutual interference while maintaining sensing coverage. This feedback-driven coordination enables multiple devices to operate cooperatively in decentralized networks, resolving the contradiction between versatility and interference.
3Measurement precision
If high power transmissions are used for sensing, then sensing range and detection accuracy are improved, but power consumption increases and interference with communication increases
Solution Approach 1:
The patent applies dynamics by making transmission power adaptive rather than fixed. The sensing system dynamically adjusts transmission power levels based on target distance, detected signal strength, and interference conditions. This dynamic power control maintains sensing accuracy for distant targets while reducing power consumption and interference when targets are nearby or when communication operations are active, resolving the contradiction between sensing accuracy and power consumption.
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 spectral efficiency and power usage by minimizing redundant transmissions and interference, improving sensing accuracy and communication performance in decentralized networks.
Implementation Method 1
utilizing non-linear chirp signals likehyperbolic frequency modulated (HFM) chirps to decouple range and velocity estimation
Implementation Method 2
HFM chirps have inherent Doppler invariance which facilitates accurate range and velocity measurement
Data Source
AI summary
Some embodiments in the present disclosure relate to transmitting and/or receiving sensing signals. Based on an estimation of the mobility of a wireless device, a frame format is selected and transmitted. In a first mobility scenario (e.g., a high mobility scenario), a first frame is transmitted that includes a sensing signal having a first waveform. In a second mobility scenario (e.g., a low mobility scenario), a second frame is transmitted that includes a sensing signal having a second waveform.