Remote Primary Spectrum Detector for Dynamic Frequency Selection
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Solution Overview
Problem
Existing wireless network systems face challenges in reliably detecting radar signals without conflicting with their primary purpose, especially under conditions of interference, and must comply with regulatory requirements for dynamic frequency selection.
Innovation Solution
A remote primary spectrum detection system is implemented, using a wireless receiver and spectrum detection logic to identify primary spectrum users, with a fail-safe mechanism and network interface to transmit 'clear' or 'primary spectrum user detected' messages, allowing dynamic frequency selection and offloading detection from access points to external radar detectors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a wireless device performs primary spectrum user detection (radar detection) to share radar frequencies, then spectrum sharing capability is improved, but the device's primary wireless communication function may be compromised or conflicted
Solution Approach 1:
The patent separates the radar detection function from the wireless communication function by introducing a remote primary spectrum user detector that communicates with the wireless device via a network interface. This segmentation allows the wireless device to perform spectrum sharing while the actual detection is performed by a specialized external component, preventing functional conflicts.
Solution Approach 2:
The patent introduces an intermediary remote detector system that acts as a mediator between the wireless device and the radar signals. The remote detector receives radar signals, processes them to detect primary spectrum users, and communicates results back to the wireless device, allowing spectrum sharing without compromising the device's primary communication function.
2Reliability
If radar detection is performed under all conditions to meet regulatory requirements, then compliance is improved, but false detection increases due to interference and spurious tones
Solution Approach 1:
The patent implements a feedback mechanism where the remote primary spectrum user detector continuously monitors the spectrum and provides updates to the wireless device. The system uses clear messages to indicate when frequencies are safe for use and primary spectrum user detected messages to indicate radar presence, allowing the wireless device to dynamically adjust its operation based on real-time spectral conditions while maintaining regulatory compliance.
Solution Approach 2:
The patent performs preliminary radar detection and spectrum analysis before the wireless device attempts to communicate on a frequency. By pre-clearing frequencies and providing advance notice of radar presence, the system ensures regulatory compliance while avoiding false detections during actual communication operations.
3Area of stationary object
If multiple wireless devices perform simultaneous radar detection, then detection coverage is improved, but coordination complexity and potential conflicts increase
Solution Approach 1:
The patent creates a universal remote detector system that can serve multiple wireless devices simultaneously through a shared network interface. This multi-functional approach allows one or more remote detectors to provide spectrum monitoring services to multiple wireless devices, expanding detection coverage while avoiding the complexity of each device performing independent detection.
Data Source
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AI summary
An external primary spectrum user detector (ESUD) is used to take over the role of integral radar detectors, and relieve user devices of the constraints associated with Primary Spectrum User detection. The ESUD can establish a relationship with the user devices by means of a cryptographic signature. The ESUD installation includes assigning it a frequency band to scan for primary spectrum user signals and the type of signals to be detected. Once activated, the ESUD will scan its assigned frequencies and emit to types of messages, "All Clear" and "Primary Spectrum User detected." User devices on the network listen for the ESUD messages. In the absence of messages from the ESUD, the user devices activate their internal primary spectrum user detectors until ESUD messages are received.