Uplink Interference Management via Contiguous Frequency Allocation
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Solution Overview
Problem
Current wireless networks face challenges in managing uplink interference between cells, particularly at cell edges, which affects the quality of service and network performance due to high inter-cell interference and limited battery life of mobile devices.
Innovation Solution
The implementation of Uplink Interference Management (ULIM) techniques, which involve collecting downlink signal quality measurements, identifying and ranking neighboring cells, and allocating contiguous frequency resources to reduce inter-cell interference by selecting appropriate frequency reuse patterns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If traditional frequency reuse patterns are used in heterogeneous wireless networks, then spectrum utilization is maximized, but uplink inter-cell interference increases significantly at cell edges
Solution Approach 1:
The patent applies local quality by implementing cell-specific frequency allocation where each cell is assigned a contiguous frequency resource tailored to its local interference environment. The network determines downlink-to-uplink interference relationships for each cell and allocates frequencies locally rather than using uniform global patterns, thereby reducing uplink interference at cell edges while maintaining overall network performance.
Solution Approach 2:
The patent implements dynamic frequency allocation based on real-time interference measurements and cell conditions. The network continuously monitors downlink signal quality measurements from user equipment, identifies interfering cells, and adjusts frequency resource allocations dynamically to adapt to changing interference patterns and traffic conditions.
2Reliability
If contiguous frequency resources are allocated to reduce uplink interference, then uplink signal quality improves, but frequency resource utilization efficiency may decrease
Solution Approach 1:
The patent segments the frequency spectrum into multiple contiguous frequency resources, each assigned to specific cells based on their interference characteristics. This segmentation allows the system to manage interference on a per-cell basis while maintaining efficient resource utilization through structured allocation patterns.
Solution Approach 2:
The patent employs feedback mechanisms where user equipment reports downlink signal quality measurements to the network. The network uses this feedback to identify interfering cells and adjust frequency allocations accordingly, creating a closed-loop system that optimizes uplink signal quality while managing resource allocation complexity.
3Ease of operation
If frequency reuse patterns are optimized for uplink interference reduction, then cell edge user performance improves, but overall spectrum efficiency may be compromised
Solution Approach 1:
The patent changes the frequency allocation parameters from traditional reuse patterns to contiguous frequency resources assigned based on downlink-to-uplink interference relationships. This parameter change enables the system to optimize for cell edge user performance by allocating frequencies that minimize uplink interference while maintaining adequate spectrum utilization through efficient resource management.
Data Source
AI summary
Techniques for uplink interference management for wireless networks are disclosed. In some embodiments, a system, a process, and/or a computer program product for inter-cell interference management for wireless networks (e.g., heterogeneous cellular networks) includes determining a plurality of strongest neighbor cells of a cell on a wireless network based on a plurality of measurement reports; and allocating a distinct frequency reuse pattern selected from a plurality of predetermined frequency reuse patterns to each cell for uplink cellular communication to facilitate inter-cell interference management.