Small Cell Dynamic Power Regulation for Handover Stability
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Solution Overview
Problem
In wireless communication systems, small cells experience frequent handovers due to their small coverage area, leading to packet losses, voice artifacts, and increased signaling load, which can result in poor user experience and mobility issues, especially in unplanned deployments where interference is high.
Innovation Solution
A system with a mobility metric determiner, evaluator, and power regulator component that dynamically adjusts the transmit power of small cells to maintain acceptable mobility metrics, such as reducing ping-pong handovers and interference, by increasing or decreasing power based on thresholds to optimize offload from macrocells and minimize pilot pollution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If small cells are deployed to provide robust wireless coverage and incremental capacity growth, then network capacity and coverage are improved, but frequent handovers and pilot pollution occur due to small coverage area and unplanned deployment
Solution Approach 1:
The patent implements dynamic transmit power adjustment for small cells based on real-time mobility metrics. The system continuously monitors handover frequency and mobility patterns, then adaptively modifies small cell transmit power levels to optimize network performance while reducing excessive handovers and pilot pollution effects.
Solution Approach 2:
The system establishes a feedback loop where mobility metrics (such as handover frequency, cell reselection patterns, and user equipment mobility states) are continuously measured and fed back to the network controller. This feedback enables the controller to make informed decisions about small cell power adjustment, thereby resolving the contradiction between maintaining network capacity and ensuring handover stability.
2Illumination intensity
If small cells operate at high transmit power to expand coverage, then signal strength is improved, but interference to neighboring cells increases and pilot pollution regions expand
Solution Approach 1:
The patent dynamically changes the transmit power parameter of small cells based on mobility metrics and network conditions. By adjusting this critical parameter, the system optimizes signal strength within the small cell coverage area while simultaneously controlling interference levels to neighboring cells and reducing pilot pollution in high-mobility regions.
Solution Approach 2:
The system applies different transmit power levels to different small cells based on their local mobility characteristics and network environment. Rather than uniform power adjustment, each small cell's power is optimized according to its specific location, traffic patterns, and mobility metrics, thereby improving signal strength locally while minimizing interference to surrounding areas.
3Ease of manufacture
If small cells are unplanned deployed in homes and offices, then deployment flexibility and ease of installation are improved, but mobility problems such as connection failures and handover failures occur
Solution Approach 1:
The patent enables small cells to self-optimize their transmit power based on locally measured mobility metrics. The system automatically monitors handover patterns, cell reselection events, and user equipment mobility states, then autonomously adjusts power levels to prevent connection failures and handover failures, eliminating the need for manual planning and configuration while maintaining high reliability.
Solution Approach 2:
The system performs preliminary power adjustment based on predicted mobility patterns and historical performance data. By proactively modifying transmit power before mobility problems occur, the system prevents connection failures and handover failures rather than reacting to them after they happen, thereby maintaining deployment flexibility while ensuring connection stability.
Data Source
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AI summary
Disclosed are systems and methods for dynamic power regulation in small cells. In one aspect, a system is configured to determining at least one mobility metric indicative of at least one access terminal mobility at the cell. The system then configured to determine whether the value of mobility metric is acceptable. When the value of mobility metric is unacceptable, the system is configured to increase the transmit power of the cell until the value of mobility metric becomes acceptable. If the value of mobility metric does not become acceptable after increasing the transmit power of the cell above a threshold, the system is configured to decrease the transmit power of the cell.