Multi-Connectivity Handover in 5G Wireless Systems
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Solution Overview
Problem
Current 5G communication systems face challenges in supporting continuous ultra-high data rate services and fast recovery from radio link failures, especially with the addition of new small cell base stations operating in high frequency bands, leading to data degradation and service disruptions.
Innovation Solution
A method and apparatus for handover with multi-connectivity in wireless communication systems, involving the transmission of measurement reports between macro and small cell base stations, and performing random access procedures to ensure seamless handover and continuous service, utilizing techniques like beamforming and massive MIMO to manage signal quality and resource availability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If new small cell base stations are added to support ultra-high data rate services, then data rate capability is improved, but service reliability deteriorates due to radio link failures in high frequency bands
Solution Approach 1:
The patent implements dual connectivity where the UE maintains separate connection paths: one through macro cell base station (reliable, wide coverage) and another through small cell base station (high capacity, localized). This allows each connection to have optimized quality for its specific function, with the macro cell providing reliability and the small cell providing high data rate capability.
Solution Approach 2:
The patent establishes redundant connection paths before failure occurs. By maintaining simultaneous connections to both macro and small cell base stations, the system prepares backup pathways in advance. When radio link failure occurs in the small cell connection, the UE can immediately switch to the macro cell connection without service interruption.
2Speed
If handover procedures are simplified for fast mobility, then mobility support is improved, but service continuity deteriorates during handover transitions
Solution Approach 1:
The patent performs preliminary actions by establishing the connection to the macro cell base station before releasing the small cell connection during handover. This ensures that the UE has a guaranteed fallback path ready before the primary connection is terminated, maintaining service continuity throughout the handover process.
Solution Approach 2:
The macro cell base station acts as an intermediary during handover transitions. When the UE experiences radio link failure or performs handover, the macro cell provides a stable intermediate connection that bridges the transition period, ensuring uninterrupted service while the UE reconnects to new small cell base stations.
Data Source
AI summary
The present disclosure relates to 5th generation (5G) or pre-5G communication systems for supporting higher data transfer rates, following the 4th generation (4G) communication systems, such as long term evolution (LTE). A method for supporting handover with multi-connectivity in a wireless communication system is provided. The method includes sending a measurement report message including information of at least one small base station (eNB) to a macro cell eNB, receiving information of a new small eNB in a target cell from the macro cell eNB based on the measurement report message, and performing a random access procedure with the new small eNB in the target cell based on handover.