Femto Management System Dynamic Spectrum Allocation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Femto cell deployments in OFDMA networks face challenges in minimizing inter-cell interference due to the lack of scrambling codes for resource separation, and existing solutions fail to optimize resource allocation between femto and macro networks, leading to suboptimal communication pathways and throughput limitations.
Innovation Solution
A method is introduced that includes a femto management system interacting with a self-organizing network to allocate and manage resources dynamically, using geolocation and path loss data to determine optimal frequency reuse and resource allocation, shifting resources from macro to femto networks when constraints are exceeded, and employing signaling between femto cells to coordinate access and avoid interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If resource allocation is optimized between femto and macro networks, then aggregate network throughput is improved, but device complexity increases due to dynamic resource management systems
Solution Approach 1:
The system employs self-organizing network (SON) functionality that enables automatic resource allocation and interference coordination between femto and macro networks without requiring complex manual configuration. The SON system autonomously manages resource sharing, adjusts transmission parameters, and coordinates between different network types to optimize throughput while managing system complexity through automation.
Solution Approach 2:
The patent implements feedback mechanisms where the femto access point reports interference levels and resource usage to the macro network, which then adjusts resource allocation dynamically. This feedback loop enables continuous optimization of throughput by adapting to changing network conditions, allowing the system to achieve high productivity through automated iterative adjustment rather than static complex configuration.
2Productivity
If spectrum resources are shared between macro and femto cells, then spectrum usage efficiency is improved, but inter-cell interference increases
Solution Approach 1:
The system segments the available spectrum resources into different sets that can be allocated to either macro or femto cells based on local conditions. By dividing the spectrum into manageable portions and assigning them dynamically, the system achieves efficient spectrum usage while controlling interference levels through targeted resource allocation rather than uniform sharing.
Solution Approach 2:
The patent applies local quality principles by allowing different parts of the spectrum to have different allocation characteristics. The macro network and femto cells can selectively access specific frequency resources based on their local interference conditions and throughput requirements, enabling efficient spectrum utilization in each location while minimizing harmful interference through localized optimization.
3Adaptability or versatility
If dynamic resource allocation is implemented, then network adaptability is improved, but loss of time increases due to resource evaluation and reservation processes
Solution Approach 1:
The system performs preliminary actions by pre-establishing resource reservation mechanisms and evaluation criteria before actual data transmission occurs. The macro network pre-configures resource allocation frameworks and interference management protocols, allowing rapid adaptation to changing conditions without requiring time-consuming real-time evaluation and reservation processes during active communication.
Data Source
AI summary
An example method includes receiving data from a femto access point; evaluating resources being used by a macro network in which the femto access point resides; determining whether the femto access point is operating in a constrained bandwidth mode; and reserving particular resources for the femto access point to use for its communications, where the particular resource is allocated from available resources within the macro network. In a more particular embodiment, where those resources refer to spectrum resources, the method includes allocating spectrum resources between femto and macrocellular systems. In other embodiments, the method includes identifying a total throughput associated with the femto access point and one or more macro network cells, where a change in reserving particular frequencies is executed based on determining the total throughput being higher than a current throughput. The data from the femto access point can include path loss data and geolocation data.