Dual-Connectivity Handover for Zero-Interruption Cell Transition

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Solution Overview

Problem

In mobile communications systems, handovers between cells result in data transmission interruptions due to the inability to maintain connections with both the source and target network entities simultaneously, making it impossible to meet the 0 ms delay requirement during terminal movement.

Innovation Solution

Implementing dual connectivity (DC) handover by establishing connections with both the source and target nodes and then transitioning to single connectivity (SC) based on configuration information, ensuring uninterrupted data transmission.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If traditional single connectivity handover is used, then the terminal can maintain connection with one network entity at a time, but data transmission interruption occurs during handover and 0 ms delay requirement cannot be met

Engineering Contradiction:

Improveconnection stabilityVSAvoidhandover delay

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The terminal pre-establishes a connection with the target node before disconnecting from the source node during handover. The handover command includes both DC configuration information (for establishing connection with target node) and SC configuration information (for subsequent single connectivity). This preliminary action ensures that the data transmission path is ready before the old path is severed, eliminating handover interruption and meeting the 0 ms delay requirement.

Inventive Principle:

Principle #10Preliminary action

2Reliability

If dual connectivity is established during handover, then data transmission interruption is avoided, but the complexity of connection management increases

Engineering Contradiction:

Improvedata transmission continuityVSAvoidconnection management complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The system dynamically transitions from dual connectivity to single connectivity based on handover completion status. Initially, the terminal maintains dual connectivity with both source and target nodes to ensure continuous data transmission. After the handover is complete (when the target node becomes the serving node), the terminal switches to single connectivity with the target node. This dynamic adaptation reduces connection management complexity while maintaining data transmission continuity during the critical handover period.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The handover process is segmented into distinct phases: Phase 1 uses DC configuration information to establish dual connectivity for uninterrupted data transmission; Phase 2 uses SC configuration information to transition to single connectivity after handover completion. By segmenting the handover process and applying different connectivity modes to different phases, the system manages complexity while ensuring reliability.

Inventive Principle:

Principle #1Segmentation

Data Source

PatentUS12477592B2Method for dual connectivity handover, terminal, and network device

Publication Date: 2025.11.18 VIVO MOBILE COMM CO LTD

AI summary

This disclosure discloses a method for dual connectivity handover, a terminal, and a network device. The method includes: receiving a handover command sent from a source node, where the handover command carries dual connectivity DC configuration information for the source node and a target node, and single connectivity SC configuration information for the target node; when the DC configuration information is supported, establishing dual connectivity with the source node and the target node based on the DC configuration information; and based on the SC configuration information, disconnecting the connection with the source node in the dual connectivity and maintaining a single connection with the target node.