Anchor-Based Mobility Management for Heterogeneous Networks
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Solution Overview
Problem
In LTE networks with small cell deployment, frequent handovers lead to increased signaling overhead and data interruptions, compromising network capacity and user experience due to the need for full-scale handover procedures in legacy mobility mechanisms.
Innovation Solution
The introduction of an anchor-based architecture in heterogeneous networks allows for enhanced handover and reestablishment procedures within a local area network, where the UE is served by an anchor eNB and one or more drift eNBs, reducing signaling and data interruptions by performing cell changes and reestablishments without full-scale handover signaling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If small cells are deployed to increase system capacity, then user throughput is improved, but handover frequency increases causing signaling overhead to worsen
Solution Approach 1:
The patent segments the handover procedure into two types: full handover for macro cell changes and simplified handover for small cell changes. This segmentation allows the system to apply different levels of signaling overhead based on the type of cell transition, reducing overall signaling burden while maintaining the capacity benefits of small cell deployment.
Solution Approach 2:
The patent applies local quality by implementing location-specific handover mechanisms. When a UE is determined to be in a small cell area, a simplified handover procedure is applied locally. When in macro cell area, the full handover procedure is used. This localized approach optimizes signaling overhead based on the specific deployment scenario.
2Reliability
If full-scale handover procedure is performed for every small cell change, then mobility management is ensured, but data interruption time increases
Solution Approach 1:
The patent applies partial action by implementing a simplified handover procedure for small cell changes that performs only the essential mobility management functions. Instead of executing the complete handover sequence, the system performs a reduced set of actions sufficient for small cell transitions, thereby minimizing data interruption while maintaining mobility management reliability.
3Productivity
If frequent handovers occur in small cell networks, then network capacity is utilized, but network signaling storm occurs
Solution Approach 1:
The patent segments the handover signaling into two distinct paths: full handover signaling for macro cell changes and simplified handover signaling for small cell changes. This segmentation prevents the accumulation of excessive signaling messages that would otherwise occur with frequent small cell handovers, thereby avoiding signaling storms while maintaining network capacity utilization.
4Adaptability or versatility
If legacy mobility mechanism is used in heterogeneous networks, then basic handover is supported, but overhead increases reducing network efficiency
Solution Approach 1:
The patent implements dynamic handover mechanisms that adapt the handover procedure based on real-time conditions. The system dynamically determines whether to apply full or simplified handover based on the current cell type, UE location, and network state. This dynamic approach maintains adaptability across different scenarios while reducing overall overhead compared to static legacy mechanisms.
Data Source
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AI summary
In a heterogeneous network, enhanced handover and reestablishment procedures are proposed within a local area network. The enhanced procedures are more efficient, e.g., with less signaling and less data interruption than the legacy mobility mechanism. In a local area network, a UE is served by an anchor eNB in macro cell layer and one or more drift eNBs in small cell layer. When the UE moves within the local area network, the UE anchor does not need to change. For cell change within the same anchor, the enhanced procedures reduces signaling overhead and data interruption time.