CBSD Antenna Beamforming for Cell Edge Interference Mitigation
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Solution Overview
Problem
In shared spectrum systems like Citizens Broadband Radio Service (CBRS), interference management is challenging due to dynamic spectrum availability and the need to prevent service interruptions or loss of coverage, especially at the cell edge where higher interference levels can lead to CBSDs being deallocated by the Spectrum Access System (SAS).
Innovation Solution
A method where a CBRS device (CBSD) determines the number of mobile devices in different regions and assigns a greater number of antennas to the cell edge region, using at least 8 antennas per mobile device to form non-overlapping, directive beams, thereby mitigating interference and reducing the likelihood of being deallocated by the SAS.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If more antennas are assigned to cell edge region, then interference is reduced and coverage is improved, but device complexity and resource allocation difficulty increase
Solution Approach 1:
The patent applies local quality by assigning different numbers of antennas to different regions within the cell. Specifically, the cell edge region receives a greater number of antennas (at least 8 per mobile device) compared to other regions, creating non-uniform resource allocation that targets interference-prone areas while preserving coverage continuity without uniformly increasing complexity across the entire system.
2Object-affected harmful factors
If at least 8 antennas are assigned per mobile device in cell edge region, then interference is mitigated through non-overlapping directive beams, but spectrum resources are consumed more rapidly
Solution Approach 1:
The patent segments the spectrum resources by allocating different numbers of antennas to different mobile devices based on their location. Mobile devices in the cell edge region receive at least 8 antennas to form non-overlapping directive beams that mitigate interference, while mobile devices in other regions receive fewer antennas, thereby reducing overall spectrum resource consumption while still protecting against harmful interference at critical cell edge locations.
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
This approach improves user experience by reducing interference, preventing CBSD deallocation, and maintaining network performance by creating narrower beams that are less noticeable to the SAS, thus ensuring continuous coverage and connectivity.
Implementation Method 1
assigning, by the CBSD, at least 8 antennas to each mobile device of a defined number of mobile devices of the number of mobile devices in the cell edge region to transmit non-overlapping and directive beams to mitigate interference at the cell edge region
Data Source
AI summary
Methods and systems for citizens broadband radio service (CBRS) device (CBSD) interference management is described. A method for managing shared spectrum network interference includes determining, by a Citizens Broadband Radio Service (CBRS) device (CBSD) granted shared spectrum by a spectrum access system (SAS), a number of mobile devices in a defined number of regions in a cell covered by the CBSD, assigning, by the CBSD, a greater number of antennas to a cell edge region from the defined number of regions than a remaining regions in the defined number of regions, and assigning, by the CBSD, at least 8 antennas to each mobile device of a defined number of mobile devices of the number of mobile devices in the cell edge region to transmit non-overlapping and directive beams to mitigate interference at the cell edge region.