Interference Coordination in Heterogeneous Networks
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Solution Overview
Problem
In heterogeneous networks, co-channel interference between micro cells and macro cells at the same frequency leads to reduced uplink capacity of macro cells due to terminal device interference, which existing methods have not adequately addressed.
Innovation Solution
Implementing an interference coordination method where the Radio Network Controller (RNC) determines and assigns an uplink interference level to each micro cell based on the macro cell's uplink capacity target, controlling the uplink power of terminal devices to minimize interference and ensure macro cell system capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If micro cells are deployed at the same frequency as macro cells to increase system capacity, then the number of cells and system capacity increase exponentially, but co-channel interference occurs between micro cells and macro cells
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the uplink interference level parameter assigned to each micro cell. The RNC monitors the uplink capacity target of macro cells and modifies the interference level parameters of neighboring micro cells accordingly, allowing the system to maintain high capacity while managing interference through parameter optimization
Solution Approach 2:
The patent implements feedback mechanisms where the RNC continuously receives information about macro cell uplink capacity targets and adjusts micro cell interference levels based on this feedback. The system creates a closed-loop control where interference management decisions are based on real-time system performance information
2Reliability
If terminal devices access micro cells to improve service quality, then user demand on quality of service is met, but uplink interference is caused to macro cell base stations and uplink capacity is reduced
Solution Approach 1:
The patent applies local quality by assigning different uplink interference level parameters to different micro cells based on their specific locations and impact on neighboring macro cells. Each micro cell receives a customized interference level parameter that reflects its local interference characteristics, allowing differentiated management of uplink interference across the network
Solution Approach 2:
The patent dynamically adjusts the uplink interference level parameters assigned to micro cells based on real-time system conditions. When macro cell uplink capacity targets are approached, the RNC modifies the interference level parameters of affected micro cells to reduce uplink interference from terminal devices
Data Source
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AI summary
The present application discloses an interference coordination method and apparatus and relates to the communications field, which are used to solve a problem in the prior art that a terminal device accessing to a micro cell may cause uplink interference to a macro cell base station and lead to a reduction in an uplink capacity of a macro cell. The method provided in the present application includes: determining an uplink capacity target of a macro cell and assigning an uplink interference level to a micro cell according to the uplink capacity target; sending a control message to a micro cell gateway, a micro cell base station controller, or a micro cell base station, where the control message is used to control uplink interference of the micro cell. The present application is applicable to the communications field and is used to control co-channel interference generated by a micro cell.