Base Station Antenna Beam Pattern Control for Public Safety Interference
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Solution Overview
Problem
Current cellular wireless systems face interference issues with public safety radio communications, particularly in the 800 MHz band, due to imperfect filter roll-off and out-of-band emissions, which can impact first responder devices located near cellular base stations, especially in urban areas where small-cell deployments are common.
Innovation Solution
A method and system where a cellular base station automatically changes its antenna beam pattern to a predefined safe direction upon detecting public safety communication, minimizing interference by directing the beam away from areas where first responders are likely to be, without requiring advanced knowledge of the responder's location or direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If small-cell base stations are deployed close to streets and first responder areas to improve wireless coverage, then coverage is improved, but harmful interference to public safety communications increases
Solution Approach 1:
The base station's antenna beam pattern is made dynamically adjustable rather than fixed. The system automatically changes the beam pattern in response to detecting public safety communications, allowing the coverage area to be optimized when needed and the interference to be minimized when public safety devices are present.
Solution Approach 2:
The system changes the antenna radiation parameters (beam pattern characteristics) based on detected conditions. When public safety communications are detected, the beam pattern parameters are adjusted to direct energy away from areas where first responder devices are likely to be located, thereby reducing harmful interference while maintaining coverage elsewhere.
2Object-affected harmful factors
If base station transmission power is reduced to avoid interference with public safety communications, then interference is reduced, but wireless coverage and service quality deteriorate
Solution Approach 1:
Instead of uniformly reducing transmission power across all directions, the system applies directional control to the antenna beam pattern. This allows the base station to maintain high transmission power and reliable service in directions away from public safety areas while directing lower energy towards areas where first responder devices are likely to be located.
Solution Approach 2:
The transmission characteristics are made dynamic rather than static. The system automatically adjusts the beam pattern based on real-time detection of public safety communications, allowing full power transmission when no public safety devices are present and selective power reduction only when and where needed.
3Object-affected harmful factors
If automated beam pattern adjustment is implemented to reduce interference, then interference control is improved, but system complexity increases
Solution Approach 1:
The system is pre-configured with beam pattern settings that correspond to safe directions away from areas where public safety devices are likely to be located. When interference is detected, the system simply switches to the pre-configured safe beam pattern rather than performing complex real-time calculations, thereby reducing the computational complexity while maintaining effective interference control.
Solution Approach 2:
The system uses feedback from monitoring public safety frequency channels to automatically trigger beam pattern adjustments. This closed-loop approach allows the system to respond to actual interference conditions rather than requiring constant manual configuration, simplifying operation while maintaining effectiveness.
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
Effectively reduces the likelihood of harmful interference to public safety communications by dynamically adjusting the base station's antenna beam pattern, thereby maintaining effective wireless coverage while avoiding interference with first responder devices.
Implementation Method 1
a base station each radiating to provide coverage... configured to provide an antenna beam pattern for downlink cellular wireless communication service
Implementation Method 2
automatically changing the antenna beam pattern of the base station to be directed to a predefined safe direction... minimizing interference by directing the beam away from areas
Data Source
AI summary
A cellular base station and/or associated equipment will detect the presence of nearby public safety communication and, in response, will automatically change the base station's antenna beam pattern to be directed to a predefined safe direction, so as to quickly minimize the likelihood of the base station producing harmful interference to the public safety communication. Further, after thus quickly working to minimize the likelihood of such interference, the base station and/or associated equipment could then more specifically determine a direction from which the public safety communication is arriving and could further adjust the base station's antenna beam pattern to be directed away from the determined direction.