Distributed Femtocell Handover Control for Core Network Load Reduction
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Solution Overview
Problem
The existing handover control systems for femtocells put a significant burden on the core network due to the need to process large amounts of data during user equipment handovers between femtocells, which can lead to network breakdowns.
Innovation Solution
A handover control system where the core network selects server femtocells from each region to process handover control, reducing the core network's data processing load by utilizing a distributed architecture with modules executed by both femtocell and core network processors, including location determining, bandwidth obtaining, and control modules to manage handovers efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the core network processes all handover control data centrally, then handover control is centralized and simple to manage, but the core network becomes overloaded and prone to breakdowns
Solution Approach 1:
The patent segments the handover control function by introducing a distributed handover control module in each femtocell that handles local handover decisions and data processing. This divides the centralized core network's workload into multiple distributed units at the femtocell level, reducing the core network's data processing burden while maintaining reliable handover control through localized intelligence
2Device complexity
If handover control is centralized in the core network, then system architecture is simple, but the core network experiences high data processing load and potential breakdowns
Solution Approach 1:
The patent applies local quality by equipping each femtocell with a handover control module that possesses local decision-making capabilities. Instead of uniform centralized control, each femtocell independently processes handover data and makes local handover decisions, distributing the computational load and improving core network stability while maintaining manageable system architecture through standardized module deployment
Data Source
AI summary
A handover control method includes the follow steps. First, determining a geographical location of each femtocell and determining a maximum bandwidth provided by each femtocell, and determining which femtocells are in a same region according to the geographical information of each femtocell. Secondly, selecting one or more femtocells from one region as server femtocells of the region by comparing the maximum bandwidth of the femtocells in the same region, and transmitting identification information of each server femtocell to non-server femtocells near the server femtocell. Thirdly. transmitting registration information of all other femtocells of all regions to each server femtocell. Fourthly, when receiving a handover report from user equipment to switch from an original femtocell to a target femtocell, obtaining the registration information of the target femtocell from one server femtocell. Finally, transmitting a control signal including the obtained registration information to the user equipment.