Handover Control Unit Weighting Cell Parameters
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Solution Overview
Problem
Advanced mobile communication systems in multiple cell environments experience frequent handovers due to smaller cell radii and faster mobile terminal speeds, leading to unnecessary handovers and increased network load, which results in performance degradation and overhead in signaling.
Innovation Solution
An apparatus and method for handover in advanced mobile communication systems that select an optimal cell based on comprehensive consideration of traffic characteristics, mobile terminal speed, and adjacent cell state by using a handover control unit, determination unit, cell selection control unit, and execution unit to assign weights and prioritize cell selection parameters for efficient handover processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If cell radius is reduced to increase frequency efficiency, then frequency utilization is improved, but handover frequency increases causing unnecessary handovers and signaling overhead
Solution Approach 1:
The patent changes the parameters for handover decision by introducing a velocity threshold parameter and weighted scoring parameters for multiple cell determination criteria. By adjusting these parameters dynamically based on terminal velocity and service type, the system reduces unnecessary handovers while maintaining frequency efficiency benefits of small cells.
Solution Approach 2:
The patent implements dynamic handover decision-making where the system adapts its behavior based on real-time terminal velocity measurements and network conditions. The handover control unit dynamically adjusts handover thresholds and priorities, transitioning from static handover policies to dynamic ones that reduce signaling overhead during high-velocity scenarios.
2Speed
If handover processing speed is increased to handle frequent handovers, then system responsiveness is improved, but network load increases
Solution Approach 1:
The patent extracts and eliminates unnecessary handovers by implementing a velocity threshold mechanism that identifies and excludes high-velocity terminal movements from handover processing. This extraction reduces the quantity of handover processing required while maintaining necessary handovers for optimal service, thereby reducing network load.
Solution Approach 2:
The patent applies partial action by selectively processing handovers based on prioritization criteria. Instead of processing all potential handovers equally, the system processes only those that meet certain conditions (e.g., low velocity, high priority services), reducing the total network load while maintaining essential handover functionality.
3Reliability
If comprehensive cell selection criteria are applied to optimize handover, then Quality of Service is improved, but handover decision complexity increases
Solution Approach 1:
The patent segments the complex handover decision process into distinct functional modules: a handover control unit for overall coordination, a cell determination unit for evaluating multiple criteria, and a handover execution unit for implementing decisions. This segmentation reduces decision complexity by dividing the comprehensive evaluation process into manageable, organized components.
Data Source
AI summary
An apparatus for performing handover in an advanced mobile communication system which provides traffic service to a mobile terminal in a multiple cell environment, the apparatus includes: a handover control unit for recognizing cell determination parameters based on terminal status information collected from the mobile terminal and/or information on traffic provided to the mobile terminal; a handover determination unit for assigning predetermined weights to each of the cell determination parameters when handover is required; a cell selection control unit for determining importance of each of the cell determination parameters based on the assigned weights and generating cell selection information for selecting a candidate cell for handover, which is the most optimal for the cell determination parameters in the order of the importance, among cells adjacent to a serving cell to which the mobile terminal belongs; and a handover execution unit for executing the handover based on the cell selection information.