Dual Connectivity Handover Latency Reduction
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Solution Overview
Problem
Existing communication systems face challenges in maintaining data transmission during handovers between macro cells, particularly when a split bearer is maintained in dual connectivity, leading to latency issues in uplink data transmission.
Innovation Solution
A communication system that includes a user equipment device and multiple base station devices, where the system maintains a connection with a small-scale base station device during handovers between large-scale base station devices, allowing data transmission to continue through the small-scale base station device before the communication path is changed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a handover process is performed between large-scale base station devices, then the communication path is changed from the moving-source large-scale base station device to the moving-target large-scale base station device, but data transmission is interrupted and latency increases
Solution Approach 1:
The system establishes a preliminary connection with the target large-scale base station device (T-MeNB) before the handover is completed. The user equipment device starts transmitting data to the small-scale base station device (SeNB) before the communication path is changed, ensuring continuous data flow during the handover process. This preliminary action prevents data transmission interruption and reduces handover latency.
Solution Approach 2:
The small-scale base station device (SeNB) acts as an intermediary during the handover process. The user equipment device maintains connection with the SeNB throughout the handover, and data can be transmitted through the SeNB even while the connection between the user equipment device and large-scale base station devices is being reconfigured. This intermediary approach ensures continuous data transmission path.
2Reliability
If dual connectivity with split bearer is maintained, then data transmission can continue through multiple paths, but system complexity increases
Solution Approach 1:
The system segments the data transmission path into two independent components: a control plane connection between the user equipment device and the master base station device (MeNB), and a user plane data path through the small-scale base station device (SeNB). This segmentation allows the control connection to be managed separately from the data transmission path, simplifying the overall system management while maintaining dual connectivity benefits.
Data Source
AI summary
In a communication system according to the present invention, a UE and an Men perform both a direct communication and a communication through a SeNB. Along with moving of the UE, a handover process of switching the MeNB to which the UE is connected, from an S-MeNB to a T-MeNB is performed. The connection between the UE and the SeNB is maintained during the handover process. The UE starts transmitting data to the SeNB before a communication path between the UE and the MeNB is changed from a path formed by the S-MeNB and the UE to a path formed by the T-MeNB and the UE.