Management Server Frequency Allocation for Femtocell Interference
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Solution Overview
Problem
Current base station configurations, especially femtocell base stations, face issues with frequency band management, leading to potential interference with public macrocells due to inaccurate measurement of receiving power or centralized control without location information, resulting in inefficient frequency allocation and unfairness based on the order of operation.
Innovation Solution
A management server system that creates and manages an available frequency list based on location information from base stations, ensuring that frequency bands are assigned appropriately to prevent interference and dynamically allocate resources, allowing femtocell base stations to set carrier frequencies according to the received list.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a base station autonomously sets carrier frequency based on receiving power measurement, then frequency allocation flexibility is improved, but reliability deteriorates due to measurement errors causing interference to public macrocells
Solution Approach 1:
The patent introduces a management server as an intermediary between base stations and frequency bands. The management server holds location/frequency lists and creates available frequency lists based on base station location information, acting as a mediator that ensures reliable frequency allocation while maintaining flexibility. This resolves the contradiction by replacing autonomous but unreliable base station measurements with a centralized management system that guarantees interference prevention.
2Device complexity
If centralized control assigns frequency bands without location information, then device complexity is reduced, but harmful factors increase due to interference with public macrocells
Solution Approach 1:
The patent applies preliminary action by pre-preparing location/frequency lists that associate location information with available frequency bands before actual frequency allocation. The management server creates available frequency lists in advance based on location data, so when base stations need frequency assignment, they can immediately obtain interference-free frequencies without complex real-time calculations, thus reducing control complexity while preventing interference.
3Productivity
If femtocell base stations are deployed to improve wireless environment, then productivity is improved, but harmful factors increase due to potential interference with public macrocells
Solution Approach 1:
The patent applies local quality by creating location-specific available frequency lists tailored to each base station's geographical position. Instead of uniform frequency allocation, the management server provides customized frequency recommendations based on local conditions (location information), allowing femtocell deployment to improve productivity while each location's specific interference characteristics are addressed through localized frequency selection.
Data Source
AI summary
There is provided a management server including a holding unit for holding a location/frequency list in which location information and frequency information are associated, a list creation unit for creating an available frequency list by extracting, from the location/frequency list, frequency information corresponding to location information received from a base station, and a list transmission unit for transmitting the available frequency list created by the list creation unit to the base station.