SAS PAL Interference Mitigation via Dynamic Exclusion Zones
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Solution Overview
Problem
Current spectrum sharing schemes, such as Licensed Spectrum Access (LSA) and Spectrum Access System (SAS), face challenges in effectively protecting Priority Access License (PAL) users from interference by General Authorized Access (GAA) users without requiring complete knowledge of base station locations, which is impractical due to privacy concerns and stability issues.
Innovation Solution
Implementing exclusion/protection zones dynamically to protect PAL users from GAA transmissions, using a mathematical distribution of base stations' locations and number of simultaneous transmitters to manage interference, and optimizing exclusion zones to ensure aggregated interference remains below a threshold, while sharing minimal system information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If complete knowledge of base station locations is required to protect PAL users from GAA interference, then interference protection is improved, but system complexity and privacy requirements worsen
Solution Approach 1:
The patent extracts only the necessary information (number of transmitters and statistical distribution parameters) from the complete base station location knowledge, allowing interference protection to be achieved without requiring full location data sharing between networks
Solution Approach 2:
The patent introduces statistical distribution models as an intermediary between actual base station locations and interference calculation, enabling protection mechanisms to operate on aggregated statistical data rather than individual location coordinates
2Reliability
If detailed configuration information is shared between networks, then interference management is improved, but privacy concerns and stability issues worsen
Solution Approach 1:
The patent extracts only the essential statistical parameters (number of transmitters, location distribution characteristics) needed for interference management, eliminating the need to share sensitive detailed configuration information such as exact base station locations and private network settings
Solution Approach 2:
The patent transforms detailed configuration information into statistical distribution parameters, changing the form of data shared between networks from specific sensitive values to aggregated statistical characteristics that maintain privacy while enabling interference management
3Reliability
If exclusion zones are optimized to protect PAL users, then interference mitigation is improved, but system adaptability worsens
Solution Approach 1:
The patent makes exclusion zones dynamic by allowing them to be adjusted based on changing network conditions, statistical distribution parameters, and traffic patterns, enabling the system to adapt to different scenarios while maintaining optimized protection
Solution Approach 2:
The patent enables system adaptability by allowing exclusion zone parameters to be modified based on statistical distribution changes, transmitter number variations, and interference threshold adjustments, maintaining optimization while responding to dynamic network conditions
Data Source
AI summary
A shared spectrum network device in a higher-tier network may include one or more processors configured to receive information provided from a lower-tier network, estimate, based on the information, interference to the higher-tier network from one or more transmitters of the lower-tier network, compare the estimated interference to a threshold value, and identify a geographic zone in which transmission by one or more transmitters of the lower-tier network is limited based on the comparison.