Adaptive Radar Detection in Shared Spectrum
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Solution Overview
Problem
Current DFS detection solutions for Wi-Fi are not optimized to recognize LTE signals, leading to false positives and challenges in detecting radar signals, especially for LTE and LAA systems that do not employ LBT, due to varying pulse width and pulse repetition intervals, which can result in missed radar signals.
Innovation Solution
A method and system for radar detection in shared spectrum bands, where a network node adjusts its transmission cycle pattern by extending the transmit off time based on detected radar pulses, allowing for more accurate detection and reducing false positives by adapting the transmit ON and OFF durations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If Wi-Fi DFS detection solutions are used for LTE/LAA radar detection, then detection can be implemented, but detection accuracy deteriorates due to false positives and missed radar signals caused by varying pulse width and pulse repetition intervals
Solution Approach 1:
The patent applies dynamics by making the transmission cycle pattern adjustable and adaptive. The network node dynamically modifies its transmit ON time and transmit OFF time based on detected radar signals. When radar pulses are detected during the transmit OFF time, the node extends the OFF time to allow for complete radar pulse reception and accurate detection, rather than using fixed detection parameters. This dynamic adaptation resolves the contradiction between measurement precision and reliability by enabling accurate detection of varying radar pulse characteristics.
Solution Approach 2:
The patent implements parameter changes by modifying the transmission cycle pattern parameters (transmit ON time and transmit OFF time) in response to detected radar signals. The network node changes these temporal parameters to match the detected radar pulse width and repetition interval, allowing for accurate radar signal detection. This parameter adaptation directly addresses the contradiction by adjusting detection parameters to match the specific radar signal characteristics being detected.
2Measurement precision
If the transmit OFF time is extended to improve radar detection, then detection accuracy improves, but network productivity deteriorates due to reduced transmission opportunities
Solution Approach 1:
The patent applies dynamics by making the transmission cycle pattern adjustable and adaptive. The network node dynamically modifies its transmit ON time and transmit OFF time based on detected radar signals. When radar pulses are detected during the transmit OFF time, the node extends the OFF time to allow for complete radar pulse reception and accurate detection, rather than using fixed detection parameters. This dynamic adaptation resolves the contradiction between measurement precision and reliability by enabling accurate detection of varying radar pulse characteristics.
Solution Approach 2:
The patent implements periodic action by using a structured transmission cycle pattern with alternating transmit ON periods and transmit OFF periods. This periodic structure allows the system to regularly switch between transmission and detection modes, ensuring that radar detection opportunities are systematically incorporated into the transmission schedule. The periodic nature of the cycle pattern balances productivity and detection accuracy by guaranteeing regular detection windows while maintaining overall transmission efficiency.
3Ease of operation
If fixed transmission cycle patterns are used for LTE-U, then implementation is simplified, but radar detection reliability deteriorates due to inability to adapt to varying radar pulse characteristics
Solution Approach 1:
The patent applies dynamics by making the transmission cycle pattern adjustable and adaptive. The network node dynamically modifies its transmit ON time and transmit OFF time based on detected radar signals. When radar pulses are detected during the transmit OFF time, the node extends the OFF time to allow for complete radar pulse reception and accurate detection, rather than using fixed detection parameters. This dynamic adaptation resolves the contradiction between measurement precision and reliability by enabling accurate detection of varying radar pulse characteristics.
Solution Approach 2:
The patent implements self-service by enabling the network node to automatically adjust its own transmission cycle pattern based on radar signal detection. The node monitors the spectrum, detects radar pulses, and autonomously modifies its transmission parameters without external intervention. This self-adjusting capability maintains implementation simplicity while improving detection reliability, as the system adapts itself to varying radar characteristics without requiring complex external control mechanisms.
Data Source
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AI summary
The present disclosure relates to a method and system in a wireless network for radar detection in certain bands e.g. bands normally used for unlicensed access. In one broad aspect, a method is provided for a network node configured to control wireless transmissions in a frequency band also used for radar transmissions. In that method, the network node controls the wireless transmissions using a transmission cycle pattern defined by a transmit on time and a transmit off time. The method includes after a wireless transmission during the transmit-on time of a first transmission cycle, detecting, during the transmit-off time of the first transmission cycle, at least one radar pulse in the frequency band and extending the transmit off time of a second transmission cycle based on the at least one radar pulse detected. Advantageously, in some implementations, extending the transmit off time when one or more radar pulses are detected provides more time to detect a larger number of pulses which as a result, may improve radar detection accuracy.