Heterogeneous Wireless Network Mobility Control
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Solution Overview
Problem
In heterogeneous wireless networks, frequent cell handovers and reselections lead to unnecessary overhead signaling and resource wastage, particularly for high-mobility users, as existing technologies do not effectively consider cell size and user mobility when deciding on handover or reselection criteria.
Innovation Solution
The method involves determining the velocity of a user device and the size of a target cell, adjusting handover or cell reselection parameters to prevent or minimize handovers and reselections between cells, thereby reducing unnecessary switching and signaling overhead by considering the mobility state and cell size criteria.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If cell handover and reselection criteria are made more lenient to accommodate high-mobility users, then user service quality is improved, but unnecessary handovers and signaling overhead increase
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting handover and reselection criteria based on user mobility state and cell size. For high-mobility users in small cells, the system modifies measurement thresholds and handover parameters to prevent excessive switching, thereby reducing signaling overhead while maintaining service quality.
Solution Approach 2:
The system implements dynamics by making handover criteria adaptive rather than static. The patent introduces mobility state detection and dynamically adjusts reselection parameters based on user velocity and cell size characteristics, allowing the network to respond flexibly to changing conditions and avoid unnecessary handovers.
2Reliability
If frequent cell switching is allowed to maintain optimal signal quality, then communication reliability is improved, but network resources are wasted due to excessive handover signaling
Solution Approach 1:
The patent modifies handover parameters such as measurement thresholds and time-to-trigger based on mobility state and cell size. By changing these parameters dynamically, the system maintains communication reliability for mobile users while preventing excessive handovers that would degrade network efficiency.
Solution Approach 2:
The system applies different handover criteria locally based on cell size and user mobility characteristics. The patent implements mobility state detection and applies tailored reselection parameters for different scenarios (e.g., high-mobility users in small cells versus low-mobility users in macro cells), optimizing both reliability and efficiency for each local context.
3Device complexity
If cell size is not considered in handover decisions, then homogeneous network simplicity is maintained, but heterogeneous networks experience unnecessary handovers and resource wastage
Solution Approach 1:
The patent extends existing handover parameters to include cell size considerations. By modifying reselection criteria to account for cell size differences in heterogeneous networks, the system prevents unnecessary handovers between macro and small cells while maintaining manageable network complexity through standardized parameter adjustments.
Data Source
AI summary
In a wireless network including a first cell and a second cell, it is determined whether a measure of mobility of a user device meets a mobility criterion, and it is determined whether a size of the second cell meets a cell size criterion. When it is determined that (i) the measure of mobility of the user device meets the mobility criterion and (ii) the size of the second cell meets the cell size criterion, the user device is prevented from being switched from the first cell to the second cell, or at least one of (i) a handover parameter or (ii) a cell reselection parameter is adjusted in order to change a probability that the user device will switch from the first cell to the second cell.