Dynamic Spectrum Grants for Radar-Safe Shared Wireless Access
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Solution Overview
Problem
Conventional semi-static channel access modes in wireless networks are not suitable for coexistence with radar systems due to potential interference and failure of clear channel assessment, especially in shared spectrum environments.
Innovation Solution
A method and system for generating a propagation model of priority users, determining potential interference, and modifying spectrum grants for groups of wireless stations to avoid interference with incumbent radar systems, using incumbent informer provider data and environmental sensing capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If semi-static channel access mode is used in shared spectrum, then wireless stations can operate with fixed transmission schedules, but interference with radar systems occurs and clear channel assessment fails
Solution Approach 1:
The patent implements dynamic spectrum access by transitioning from fixed semi-static channel access to adaptive transmission scheduling. The system continuously monitors radar activity and dynamically adjusts transmission parameters including time slots, frequency channels, and power levels based on real-time environmental conditions, ensuring reliable operation in shared spectrum environments
Solution Approach 2:
The patent employs feedback mechanisms through Environmental Sensing Capabilities (ESCs) that continuously detect radar signals and provide information to the spectrum access controller. This feedback loop enables the system to identify incumbent radar operations and adjust wireless station transmissions accordingly, preventing interference while maintaining spectrum utilization
2Productivity
If continuous transmissions are used in shared spectrum, then wireless network throughput is maintained, but interference with radar operations increases
Solution Approach 1:
The patent implements periodic transmission patterns with structured idle periods that align with radar pulse repetition intervals. By organizing transmissions into periodic bursts separated by quiet periods, the system maintains high network throughput during active slots while ensuring radar operations during idle slots, effectively reducing harmful interference
Solution Approach 2:
The patent performs preliminary Clear Channel Assessment (CCA) before transmission bursts to detect incumbent radar operations in advance. By checking channel availability beforehand and adjusting transmission plans based on detected radar activity, the system prevents interference before it occurs while maintaining efficient spectrum utilization
3Reliability
If spectrum grants are suspended for radar protection, then radar interference is avoided, but wireless station operational time decreases
Solution Approach 1:
The patent applies partial spectrum access by allowing wireless stations to operate during specific time slots and frequency channels that do not conflict with radar operations. Instead of complete suspension, the system grants partial access to portions of the spectrum that are safe for wireless use, minimizing time loss while ensuring radar protection
Data Source
AI summary
Various embodiments comprise systems, methods, architectures, mechanisms and apparatus configured to enable wireless stations to use their shared spectrum grants proximate a priority/incumbent user of the shared spectrum by generating a propagation model of the priority/incumbent user, determining a potential interference therewith by each of at least one group of similarly located wireless stations proximate the priority user, determining a modification to a spectrum grant for each wireless station group that would avoid interference with the priority/incumbent user by the respective wireless stations of the group, and updating the spectrum grants of each wireless station in a wireless station group using the determined spectrum grant modification associated with the wireless station group.