Dual-Connectivity Node Handover for Uninterrupted Data Transfer
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Solution Overview
Problem
Existing wireless communication systems experience data transmission interruptions during node handover in dual connectivity mode, leading to increased communication delays and degraded user experience.
Innovation Solution
A method for uninterrupted node handover in dual connectivity mode, where a master node and secondary node coordinate to ensure continuous data transmission by processing and forwarding data via both nodes, using radio bearers and security keys to maintain seamless communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the terminal device disconnects from the source node and then accesses the target node during handover, then the handover process is simple and fast, but data transmission is interrupted and service delays increase
Solution Approach 1:
The terminal device performs random access to the target node before disconnecting from the source node. This preliminary action establishes the connection with the target node in advance, ensuring that data transmission can continue without interruption once the handover is complete, thus resolving the contradiction between fast handover and continuous data transmission
Solution Approach 2:
The terminal device maintains simultaneous connections with both the source node and target node during the handover transition period. By keeping both connections active and allowing data transmission through both nodes, the system ensures continuous data flow without interruption, resolving the contradiction between simple handover process and data transmission continuity
2Reliability
If the terminal device maintains simultaneous connection with source node and target node during handover, then data transmission continuity is ensured, but the handover process complexity increases
Solution Approach 1:
The network device (source node or target node) acts as an intermediary by selecting and forwarding specific data packets to the terminal device during handover. This intermediary function simplifies the terminal device's task by automatically managing which data comes from which node, reducing the complexity of simultaneous connection management while ensuring continuous data transmission
3Ease of manufacture
If conventional handover method is used in dual connectivity mode, then the implementation is simple, but data transmission interruption occurs and user experience deteriorates
Solution Approach 1:
The system dynamically adjusts the data transmission path during handover by enabling the terminal device to receive data from both source and target nodes simultaneously. This dynamic adaptation allows the system to maintain simple implementation procedures while ensuring continuous data transmission, resolving the contradiction between implementation simplicity and data transmission continuity in dual connectivity mode
Data Source
AI summary
Embodiments of this application provide a node handover method and an apparatus. A source secondary node receives first handover information and determines to perform an uninterrupted node handover. The source secondary node performs, in a process of the uninterrupted node handover, first processing on first data received by the source secondary node, to obtain second data, and sends the second data to a terminal device. The source secondary node performs second processing on the first data to obtain third data in the process of the uninterrupted node handover, and sends fourth data to the terminal device via a target secondary node. According to some embodiments provided in this application, a communication delay of the terminal device can be reduced, and user experience of the terminal device can be improved.