Femto Base Station Interference Mitigation via Dynamic Power Control
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Solution Overview
Problem
Interference between macro cells and femto cells in wireless communication networks, particularly within structures made of high loss materials like concrete or metal, leads to weak signal reception and unreliable mobile communications.
Innovation Solution
A method and system that includes identifying preselected wireless signal carriers based on geographical area, measuring initial power levels, and adjusting the transmission power of femto transmitters to minimize interference, using a carrier selection module and fine tuning module to optimize signal strength and reduce interference between femto and macro cells.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If femto cells are deployed within structures made of high loss materials, then signal coverage inside structures is improved, but interference with macro cells increases
Solution Approach 1:
The system dynamically changes transmission power parameters of femto cells based on detected macro cell interference levels. The femto base station measures downlink power levels of macro cells, compares them against threshold values, and adjusts its own transmission power accordingly to maintain reliable indoor coverage while preventing harmful interference to macro cell operations.
2Use of energy by moving object
If transmission power of femto transmitters is increased, then signal strength inside structures is improved, but interference with macro cells worsens
Solution Approach 1:
The femto base station implements a feedback mechanism by continuously measuring the downlink power levels of macro cells and using this information to adjust its own transmission power. The system compares measured power levels against predefined thresholds and dynamically modifies its transmission parameters to achieve optimal signal strength indoors while maintaining acceptable interference levels for macro cell operations.
3Productivity
If multiple wireless signal carriers are used, then network capacity is improved, but complexity of carrier selection and interference management increases
Solution Approach 1:
The system manages multiple wireless signal carriers by dynamically changing carrier selection parameters based on detected interference conditions. The femto base station identifies available carriers, measures their respective interference levels from macro cells, and selects optimal carriers for operation. This automated parameter adjustment enables efficient utilization of multiple carriers while simplifying the complexity of carrier selection and interference management through systematic decision-making algorithms.
Data Source
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AI summary
A method and system provide a plurality of femto cells that are deployed within a macro cell of cellular network. The femto cells improve cellular service inside structures, such as residential and commercial structures. Femto base stations convert signals between an airlink-interface and core network to enable data communication between the mobile terminal and an access network to occur through the Internet and a public switched telephone network. The femto base stations are independent of each other and the macro cell. The method and system provide the femto base stations with interference awareness and mitigation techniques to minimize interference with the cellular network.