Dynamic Fractional Frequency Reuse for Uneven Load Distribution
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Solution Overview
Problem
Fractional frequency reuse methods face challenges in efficiently allocating frequency resources across wireless networks, particularly in mitigating interference between neighboring cells while adapting to uneven user and traffic distributions, leading to suboptimal system efficiency and increased interference.
Innovation Solution
The proposed solution involves configuring base stations to dynamically allocate physical resource units based on user-distribution and throughput patterns, ensuring partial alignment of partition boundaries to minimize interference, and allowing different frequency partition configurations between neighboring sectors, with mechanisms for adjusting partition sizes and boundaries to optimize resource utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If arbitrary frequency partition assignment is used in FFR schemes, then flexibility in resource allocation is improved, but interference between neighboring sectors increases and system efficiency deteriorates
Solution Approach 1:
The patent applies local quality by allowing different frequency partition configurations for different cells based on their specific traffic patterns and user distributions. Each cell can independently select partition configurations that optimize its local performance while coordinating with neighbors to minimize interference, rather than enforcing a uniform partitioning scheme across the entire network.
Solution Approach 2:
The patent implements dynamics by enabling base stations to dynamically select and adjust frequency partition configurations based on changing traffic conditions. The system allows flexible reconfiguration of frequency partitions in response to varying user distributions and traffic patterns, moving away from static arbitrary assignments to adaptive dynamic allocation.
2Productivity
If dynamic power adjustment on each frequency partition is permitted, then throughput optimization is improved, but system complexity increases due to complicated derivative computation
Solution Approach 1:
The patent applies parameter changes by adjusting frequency partition configurations and power levels based on observable traffic parameters and user distributions. Instead of requiring complex derivative computations, the system uses practical measurements of traffic patterns to dynamically modify allocation parameters, achieving throughput optimization through empirically-driven parameter adjustment rather than theoretical optimization.
Data Source
AI summary
A fractional frequency reuse method for assigning physical resource units of a contiguous frequency band to sectors of cells is disclosed. Each cell includes at least one base station, for transmission of data to users in the sectors The method comprises, for each cell, segmenting the frequency band such that each separate segment includes a first contiguous portion of physical resource units dedicated to all sectors of the cell in vicinities of the center of the cell and a second contiguous portion of physical resource units dedicated for use in only one of the sectors in the cell in an outer area of the cell, assigning each cell with a physical resource unit configuration such that the second contiguous portion of physical resource units of a sector of a given cell partially overlaps with the first contiguous portion of physical resource units in a segment including the second contiguous portion dedicated to the same sector of a cell neighboring the given cell, and transmitting the data to the users in the sectors in accordance with the assigned physical resource unit configurations. Other methods, apparatuses, and systems also are disclosed.