Dynamic Spectrum Sharing Near Radar Through Adaptive Grant Control
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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, identifying groups of wireless stations, determining spectrum grant modifications to avoid interference, and updating grants to enable shared spectrum use without affecting incumbent radar systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional semi-static channel access modes are used in shared spectrum environments, then wireless stations can access spectrum resources, but interference with radar systems occurs and clear channel assessment fails
Solution Approach 1:
The patent implements dynamic spectrum access by continuously monitoring radar presence and adjusting channel access decisions in real-time. The system transitions from static semi-static channel access to dynamic access control that adapts to changing radar conditions, allowing wireless stations to access spectrum when radar is absent while avoiding interference when radar is detected.
Solution Approach 2:
The system employs feedback mechanisms where environmental sensing capability (ESC) sensors continuously monitor the spectrum environment for radar signals. This feedback information is used to update channel access control decisions, creating a closed-loop system that responds to real-time radar presence and adjusts wireless station access accordingly to prevent interference.
2Object-affected harmful factors
If dynamic protection areas are activated to protect radar operations, then radar interference protection is improved, but aggregate in-band and out-of-band interference limits are imposed on CBSDs
Solution Approach 1:
The system performs preliminary detection of radar presence through environmental sensing capability (ESC) sensors before allowing CBSD operations. By detecting radar signals in advance and creating protection areas proactively, the system prevents harmful interference before it occurs, rather than reacting after interference has been caused. This allows the system to pre-establish constraints on CBSD transmissions based on detected radar conditions.
Solution Approach 2:
The system dynamically adjusts transmission parameters of CBSDs based on detected radar conditions and protection area status. When radar is detected, the system modifies parameters such as transmission power, timing, and spatial distribution of CBSD operations to remain within interference limits. This parameter adaptation allows CBSDs to operate within protected areas while maintaining acceptable interference levels.
3Object-affected harmful factors
If CBSDs with large interference contribution to activated DPA have spectrum grants suspended, then radar protection is maintained, but spectrum access availability is reduced
Solution Approach 1:
The system segments the spectrum access control by identifying and categorizing different CBSDs based on their interference characteristics and locations relative to protection areas. Rather than uniformly suspending all CBSDs, the system selectively applies restrictions only to those with large interference contributions to activated DPAs, while allowing others to maintain spectrum access. This differentiated approach preserves radar protection while maximizing overall spectrum availability.
Solution Approach 2:
The system applies partial spectrum access restrictions rather than complete bans. By suspending spectrum grants only for CBSDs exceeding interference thresholds while allowing others to operate, the system implements a graduated response that maintains radar protection through partial action rather than total prohibition, thereby preserving more spectrum access availability.
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.