Dynamic Spectrum Sharing for Radar Protection
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Solution Overview
Problem
The existing spectrum allocation in the 3100-3650 MHz frequency band is inefficient due to interference between radar systems and mobile/fixed wireless devices, necessitating a system that can dynamically share spectrum while protecting radar operations from interference.
Innovation Solution
A Spectrum Sharing System (SSS) that utilizes spectrum sensing and GPS data to identify potential interferers, create dynamic protection zones, and switch CBSD units on/off to prevent interference, allowing mobile/fixed wireless devices to use the spectrum only when radar emissions are not detected.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the 3100-3650 MHz frequency band is allocated for radar operations, then radar operations can function reliably, but mobile and fixed wireless devices cannot utilize this spectrum
Solution Approach 1:
The patent implements dynamic spectrum sharing where the frequency band allocation changes based on radar detection. The system dynamically switches between radar-only mode and shared mode, allowing the same spectrum to serve different purposes at different times. This resolves the contradiction by making the allocation flexible rather than static, enabling both reliable radar operation when needed and spectrum utilization when radar is absent.
Solution Approach 2:
The system changes the operational parameter of spectrum availability based on radar presence. When radar emissions are detected, the spectrum is allocated to radar; when not detected, it is allocated to wireless devices. This parameter change approach allows the same physical spectrum to support different services under different conditions, resolving the fundamental allocation conflict.
2Productivity
If mobile and fixed wireless devices are allowed to operate in the 3100-3650 MHz frequency band, then spectrum utilization efficiency improves, but radar operations may suffer from interference
Solution Approach 1:
The system performs preliminary radar detection before allowing wireless devices to transmit. By checking for radar presence in advance and establishing protection zones beforehand, the system prevents interference before it can occur. This preliminary action ensures that wireless devices only operate in frequencies and areas where radar is not present, eliminating the harmful interference effect.
Solution Approach 2:
The patent introduces an intermediary spectrum sensing and coordination system that mediates between radar operations and wireless device transmissions. This intermediary detects radar signals, determines protection zones, and controls wireless device access accordingly. The intermediary acts as a buffer that prevents direct interference while enabling spectrum sharing, resolving the contradiction between utilization and protection.
3Reliability
If spectrum sensing and dynamic protection zones are implemented, then radar protection is improved, but system complexity increases
Solution Approach 1:
The system segments the frequency band into multiple channels and divides the geographical area into protection zones. By segmenting the spectrum and space, the system can independently control access in different regions and frequencies, making the complex protection task more manageable. Each segment can be controlled separately, reducing the overall system complexity while maintaining comprehensive radar protection.
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
Enables efficient spectrum sharing between radar systems and mobile/fixed wireless devices, ensuring radar protection and maximizing spectrum utilization by dynamically managing CBSD operations based on radar presence.
Implementation Method 1
The spectrum sharing action is only possible when radar emissions are not detected within the licensed service in the 3100-3650 MHz spectrum
Implementation Method 2
Via an internal process, the SSS would determine geographical areas in which CBSD units could cause interference to the incumbent radar systems
Data Source
AI summary
A Spectrum Sharing System (SSS) is a system and method which allows Radio Frequency (RF) wireless mobile and fixed devices to operate in the 3100-3650 MHz frequency band while simultaneously protecting radar operations from interference. The SSS includes equipment which utilizes spectrum sensing, GPS data, and database technology to provide a solution by which mobile and fixed wireless devices can be allowed use of the 3100-3650 MHz frequency band and share same spectrum with radar systems. The spectrum sharing action is only possible when radar emissions are not detected within the licensed service in the 3100-3650 MHz spectrum, and SSS has determined that geographical area of interest is not occupied by radar systems.