Small Cell Pilot Pollution Mitigation via Centralized Parameter Adjustment
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Solution Overview
Problem
In cellular wireless communication networks, pilot pollution from competing small cells leads to interference and signal quality degradation, particularly in areas with high building penetration loss, where traditional solutions struggle to maintain acceptable signal quality and efficiently manage limited radio resources.
Innovation Solution
A method and apparatus for mitigating pilot pollution in small cell networks by determining adjustments to transmission parameters, such as power, frequency, and time, based on signal measurements to minimize overlap, maximize signal-to-interference-and-noise ratio, and distribute traffic load, using a centralized approach to optimize resource allocation and reduce interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If small cells are deployed to provide indoor services and extend coverage, then network capacity and coverage are improved, but pilot pollution and interference increase
Solution Approach 1:
The patent changes transmission parameters (power, frequency, time) of small cells based on measured signal conditions. The network controller adjusts these parameters dynamically to optimize coverage and capacity while minimizing pilot pollution and interference, directly resolving the contradiction between improving network productivity and reducing harmful interference effects.
2Reliability
If small cells transmit at higher power to overcome building penetration loss, then signal quality is improved, but interference and pilot pollution worsen
Solution Approach 1:
The patent dynamically adjusts transmission power as one of the key parameters to be optimized. The network controller determines appropriate power levels based on signal measurements and interference conditions, allowing small cells to maintain adequate signal quality for overcoming building penetration loss while preventing excessive interference and pilot pollution in the network.
Solution Approach 2:
The patent applies different transmission parameters to different small cells based on their local environment and interference conditions. Each small cell's power, frequency, and time parameters are customized according to its specific coverage area and interference profile, enabling localized optimization that maintains signal quality where needed while minimizing interference in other areas.
3Area of stationary object
If multiple small cells operate on the same frequency resources, then network coverage is extended, but resource conflict and interference increase
Solution Approach 1:
The patent introduces additional dimensions for resource allocation beyond just frequency. By optimizing power (amplitude dimension) and time (temporal dimension) parameters in addition to frequency, the system can extend coverage area while managing interference more effectively. This multi-dimensional approach allows better utilization of radio resources and reduces conflicts between multiple small cells operating in the same geographic area.
Data Source
AI summary
A small cell (e.g., femtocell) in a wireless communication may determine a set of wireless signal measurements for a plurality of small cells causing pilot cell pollution within a coverage area. The small cell may determine an adjustment of a transmission parameter of the small cells for reducing the pilot cell pollution, and transmit the adjustment to the small cells. The adjustment may include, for example, minimizing an area of overlap between at least two small cells having signal power difference below a threshold, maximizing a signal to interference and noise ratio at a location associated with at least two small cells, minimizing an area associated with at least two pilot signals within a threshold signal level, distributing traffic load to at least two of the small cells based on the set of measurements, or by minimizing the number of small cells covering a path.