Dynamic Channel Selection in CBRS Base Stations
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Solution Overview
Problem
In wireless communication systems using the CBRS band, there is a lack of effective methods for channel selection and handover management in multi-cell environments, leading to interference issues and limited mobility due to the shared spectrum and varying access priorities.
Innovation Solution
A method and apparatus for selecting channels based on channel quality, involving an information providing server that allocates available frequency bands and a management server that generates neighbor cell lists, allowing base stations to determine optimal operation frequencies and perform handovers without multi-cell interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple channels are distributed and operated among base stations in CBRS band, then multi-cell interference is avoided and throughput is improved, but base station cannot easily perform neighbor cell detection and mobility is limited
Solution Approach 1:
The patent introduces a spectrum management system as an intermediary that coordinates frequency channel allocation among base stations. This mediator enables base stations to operate on different frequencies without direct interference while maintaining the ability to detect neighbor cells through the management system's coordination, thus resolving the contradiction between avoiding interference and enabling mobility.
2Productivity
If frequency channels are allocated dynamically among base stations, then interference is reduced and spectral efficiency is improved, but system complexity increases
Solution Approach 1:
The spectrum management system serves as a centralized intermediary that handles the complex task of dynamic frequency allocation. By offloading this complexity to a dedicated management entity rather than implementing it in each base station, the system achieves dynamic spectral efficiency improvement while keeping individual base station complexity manageable.
3Reliability
If base stations use different frequencies to avoid interference, then call quality is improved, but handover between cells becomes difficult
Solution Approach 1:
The patent implements dynamic frequency allocation where base stations can switch between different frequency channels based on operational needs and handover requirements. This dynamic approach allows the system to maintain call quality by using different frequencies for simultaneous operations while enabling handover by switching to common frequencies when cell transition is required, thus resolving the contradiction between interference avoidance and handover capability.
Data Source
AI summary
The present disclosure relates to a method of for operating a first base station in a wireless communication system, the method comprising receiving, from an information providing server, information related to an available frequency band, measuring a channel quality of each of a plurality of frequencies in the available frequency band, and determining an operation frequency based on the channel quality of each of the plurality of the frequencies.