Femtocell Interference Management via Backhaul Power Control
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Solution Overview
Problem
Current femtocell designs face challenges in managing interference between nearby femtocells or between femtocells and macrocells, as power control algorithms alone are insufficient, and existing solutions require additional receivers, increasing cost and complexity.
Innovation Solution
A system and method that configures femtocell base station transmitting power based on initialization data received from a macrocell base station, validates user equipment identifiers, and adjusts power settings to minimize interference by using a backhaul connection to gather additional information and adjust subcarrier assignments or transmit power.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If power control algorithms are used to prevent interference between femtocells and macrocells, then interference levels are reduced, but additional receivers are required which increases cost and complexity
Solution Approach 1:
The patent introduces a backhaul connection as an intermediary between the femtocell base station and macrocell base station. This backhaul connection enables the femtocell to receive initialization data and user equipment information from the macrocell without requiring additional receivers at the femtocell, thus resolving the contradiction between interference reduction and device complexity
Solution Approach 2:
The patent implements a feedback mechanism where the femtocell base station receives user equipment information from the macrocell base station via the backhaul connection. This feedback loop enables the femtocell to adjust its transmitting power based on actual interference conditions and user equipment status, achieving interference reduction without additional hardware
2Reliability
If additional receivers are added to femtocell base stations to detect interference level and path loss information, then interference management capability is improved, but cost and complexity increase
Solution Approach 1:
The patent makes the backhaul connection serve multiple functions: it carries initialization data for power configuration, transmits user equipment identifiers for validation, and delivers user equipment information for interference management. This multi-functionality eliminates the need for dedicated additional receivers, maintaining reliability while reducing complexity
Solution Approach 2:
The femtocell base station uses the existing backhaul connection infrastructure to obtain all necessary interference management information (initialization data, user equipment identifiers, and user equipment information). The system serves itself by utilizing existing resources rather than requiring additional dedicated hardware components
Data Source
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AI summary
A system and method for minimizing interference for mobile devices in a communication network that includes a macrocell base station and a femtocell having a base station. The method receives initialization data on a backhaul connection between the femtocell base station and the macrocell base station, and uses that data to configure the femtocell base station transmitting power. The method receives a user equipment identifier from a macrocell user equipment in the communication network, and determines whether the macrocell user equipment is authorized. If authorized, the macrocell user equipment is granted access to the femtocell base station. If unauthorized, user equipment information for the macrocell user equipment received on the backhaul connection is used to adjust the femtocell base station transmitting power to minimize the interference for mobile devices.