Dynamic Inter-Cell Interference Coordination for LTE Networks
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Solution Overview
Problem
Current long term evolution (LTE) radio access networks face significant challenges in efficiently coordinating inter-cell interference, leading to reduced network throughput and quality of service, particularly at cell edges, due to the limitations of existing interference mitigation techniques which often result in inefficient resource allocation and vendor-specific proprietary information requirements.
Innovation Solution
The implementation of an enhanced inter-cell interference coordination system that dynamically adjusts the number of almost blank subframes and cell range expansion based on real-time traffic load information, using a self-organizing network function to optimize resource allocation across macro and micro cells, thereby improving user throughput and network efficiency without requiring vendor-specific information sharing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional inter-cell interference coordination is used in LTE networks, then network coverage is maintained, but network throughput and quality of service deteriorate due to inefficient resource allocation and interference
Solution Approach 1:
The patent implements dynamic adjustment of ABS (Almost Blank Subframe) patterns based on real-time traffic load conditions. The system transitions from static ICIC configurations to dynamic eICIC (enhanced ICIC) where the macro cell adapts ABS patterns according to varying traffic demands, allowing flexible resource allocation that optimizes throughput while managing interference in heterogeneous networks
Solution Approach 2:
The system changes key parameters including ABS duty cycle, cell range expansion (CRE) offset, and subframe allocation patterns based on traffic load measurements. By dynamically adjusting these parameters, the network optimizes resource allocation between macro and small cells, improving overall throughput while controlling inter-cell interference through parameter optimization
2Area of stationary object
If cell range expansion is increased to improve coverage, then network coverage is enhanced, but inter-cell interference increases and degrades quality of service
Solution Approach 1:
The patent applies different ICIC strategies to different geographical locations and traffic conditions. Cell range expansion is selectively applied in specific areas where coverage enhancement is needed, while ABS patterns are configured locally to manage interference in those specific regions. This localized approach allows coverage expansion without uniformly increasing interference across the entire network
Solution Approach 2:
The system implements feedback mechanisms where traffic load information and interference measurements are continuously monitored and used to adjust CRE offset and ABS patterns. This closed-loop control ensures that coverage expansion is dynamically managed, preventing excessive interference while maintaining improved coverage where needed based on real-time network conditions
3Productivity
If vendor-specific proprietary information is used for interference coordination, then optimization performance is improved, but system complexity and information sharing requirements increase
Solution Approach 1:
The patent develops a universal ICIC framework that works across different vendor equipment and network configurations. The standardized interface and common algorithms enable multi-vendor interoperability, allowing the system to achieve network optimization without requiring vendor-specific proprietary information exchange, thus reducing system complexity while maintaining efficiency
Data Source
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AI summary
A system, a method, and a computer program product for providing an enhanced inter-cell interference coordination. Information indicating at least one almost blanking subframe (ABS) being allocated is being exchanged by at least two cells in a wireless network. Based on the allocated ABS, the devices further exchange information indicating a wireless signal throughput.