Interference Coordination in LTE-A Heterogeneous Networks
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Solution Overview
Problem
In LTE-A heterogeneous networks, inter-cell interference between base stations reduces transmission resources and reliability due to improper power coordination on almost blank subframes, affecting both downlink and uplink channels.
Innovation Solution
An interference coordination method where interfering cell base stations adjust transmit power on specific channel resources based on power coordination information, allowing for reduced interference while maintaining service transmission, thereby increasing system capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the interfering cell base station sets transmit power on ABS subframe to be very low, then interference to affected cell is reduced, but available transmission resources for interfering cell are reduced
Solution Approach 1:
The patent dynamically adjusts the transmit power parameter on ABS subframes based on the service requirements of UEs in the interfering cell. Instead of setting power to a fixed low value, the system modifies the power parameter adaptively to balance interference reduction with maintaining sufficient transmission resources for the interfering cell's own UEs.
Solution Approach 2:
The patent introduces dynamic power coordination where the transmit power on ABS subframes is not static but adjusts according to real-time service conditions. The interfering cell base station modifies its ABS subframe power levels based on whether it has UEs requiring service transmission, creating a dynamic balance between helping the affected cell and maintaining its own productivity.
2Productivity
If the interfering cell base station increases transmit power on ABS subframe to increase transmission resources, then available transmission resources are improved, but interference to affected cell base station remains strong
Solution Approach 1:
The patent modifies the transmit power parameter on ABS subframes to an appropriate level that provides sufficient resources for the interfering cell's UEs while simultaneously reducing interference to the affected cell. This parameter adjustment is coordinated between cells to achieve both goals.
Solution Approach 2:
The patent implements a feedback mechanism where the affected cell base station provides information about interference levels to the interfering cell base station. Based on this feedback, the interfering cell adjusts its ABS subframe transmit power to achieve the right balance between its own transmission needs and interference reduction.
3Productivity
If full or partial frequency spectrum reuse is performed between LPN and MeNB, then frequency spectrum utilization efficiency is improved, but intra-channel interference occurs between LPN and MeNB
Solution Approach 1:
The patent applies different transmit power qualities to different subframe types. Specifically, ABS subframes use reduced transmit power to minimize interference, while non-ABS subframes use normal transmit power to maintain spectrum utilization efficiency. This local differentiation resolves the contradiction between spectrum reuse and interference.
Solution Approach 2:
The patent segments the spectrum usage into different subframe types (ABS and non-ABS) with different power characteristics. By dividing the transmission resources into segments with different interference profiles, the system can simultaneously achieve spectrum reuse efficiency and interference reduction.
Data Source
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AI summary
Embodiments of the present invention provide an interference coordination method and a base station. The method includes: determining interfering cell base stations and interference levels of the interfering cell base stations, and receiving power coordination information sent by the interfering cell base stations, where the power coordination information is used to indicate a power headroom of an interfering cell base station on a specific channel resource or indicate a minimum transmit power of an interfering cell base station on a specific channel resource; determining, according to the interference levels and power coordination information of the interfering cell base stations, a base station requiring interference coordination among the interfering cell base stations; and sending a power adjustment request to the base station requiring interference coordination so that the base station requiring interference coordination adjusts a transmit power on the specific channel resource. The embodiments of the present invention reduce interference to an affected cell base station on a specific channel resource; and meanwhile, the interfering cell base station can still use the specific channel resource for service transmission, which increases system capacity.