Home Base Station Power Control via Path Gain Statistics
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Solution Overview
Problem
In wireless cellular telecommunication networks, inter-cell interference between home base stations and traditional base stations leads to reduced spectral efficiency and increased complexity, causing coverage holes and excessive burden on the core network, especially due to the limited coverage area of home base stations and the inability to establish efficient links between them.
Innovation Solution
A method and system that control interference by obtaining path gains between mobile terminals and home/base stations, determining coefficients for a power control function, and applying common power control to all home base stations to reduce signaling and optimize performance, using either analytical or look-up table-based approaches to manage transmission power and noise levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If home base stations are deployed to provide coverage in buildings and extend base station coverage, then network coverage is improved, but inter-cell interference increases and spectral efficiency decreases
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting transmission power levels based on path gain measurements. Mobile terminals report path gains to base stations, which then determine appropriate transmission powers using functions of these path gains. This allows the system to adapt power parameters to minimize interference while maintaining coverage, directly resolving the contradiction between extended coverage and spectral efficiency.
2Reliability
If individual power control is applied to each home base station to minimize interference, then interference coordination is improved, but signaling complexity and burden on the core network increase
Solution Approach 1:
The patent merges power control functions by having a single base station determine transmission powers for multiple mobile terminals served by different home base stations. Instead of each home base station independently controlling power, the system consolidates this function, reducing signaling overhead while maintaining effective interference coordination through centralized path gain information collection and power determination.
3Reliability
If links are established between all base stations and home base stations for ICIC messages, then interference coordination capability is improved, but network complexity and core network burden increase
Solution Approach 1:
The patent extracts the essential function of interference coordination from complex base station-to-base station messaging and implements it through mobile terminal-reported path gain measurements. Instead of establishing numerous inter-base-station links for ICIC messages, the system extracts only the necessary path gain information from mobile terminals and uses this to determine transmission powers, significantly reducing network complexity while maintaining coordination capability.
Data Source
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AI summary
The present invention concerns a method for adjusting the transmission power, in a wireless cellular telecommunication network, of signals transferred by plural mobile terminals through a wireless interface, the mobile terminals being served by at least one base station or by home base stations, the home base stations being located in the cell of the at least one base station. The method comprises the steps of: - obtaining at least the path gains between the mobile terminals and the at least one base station and at least one home base station, - determining statistics from the obtained path gains, - obtaining at least one coefficient of a function according to at least a part of the statistics, - transferring an information representative of the at least one obtained coefficient to the mobile terminals.