Dual-Connectivity Handover Triggering for Fast Cell Switching
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Solution Overview
Problem
Conventional mobile communication systems face low handover success rates due to fast channel attenuation, terminal device movement, and obstruction, particularly in dual connectivity scenarios, leading to handover failures.
Innovation Solution
A communication method where a master access network device obtains and sends handover triggering condition information to a terminal device, allowing it to actively perform handovers to secondary access network devices, enhancing success rates and flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the network device controls handover by sending handover messages to the terminal device, then the handover process is centralized and controlled, but the handover success rate is low due to fast channel attenuation, terminal movement, obstruction, and long measurement and handover preparation duration
Solution Approach 1:
The patent applies preliminary action by having the terminal device measure and evaluate candidate cells in advance while in the current cell, and by having the network device prepare handover parameters and triggering conditions beforehand. The terminal device stores measurement results and evaluates candidate cells based on pre-configured triggering conditions, so that when handover is needed, the decision can be made quickly without lengthy measurement and preparation processes, thus improving handover success rate while reducing time loss.
2Speed
If the terminal device waits for network control signals to perform handover, then the network maintains centralized control, but the terminal cannot respond quickly to fast channel attenuation and movement
Solution Approach 1:
The patent implements self-service by enabling the terminal device to autonomously measure, evaluate, and decide on handover based on pre-configured triggering conditions. The terminal device measures reference signals from candidate cells, evaluates them according to stored triggering conditions, and executes handover autonomously when conditions are met, without waiting for continuous network control signals. This significantly improves handover execution speed while maintaining network control through the pre-configuration of triggering conditions and parameters.
3Loss of information
If the network device sends detailed handover configuration information to the terminal device, then the terminal has sufficient information for handover decision, but the signaling overhead increases and the process becomes more complex
Solution Approach 1:
The patent applies segmentation by dividing the handover information into two parts: (1) essential triggering conditions and parameters sent by the network device, and (2) detailed measurement results and evaluation data collected and stored by the terminal device itself. The terminal device performs local measurements of candidate cells and stores relevant information, so that when handover is needed, only the triggering condition information needs to be transmitted from the network, reducing signaling overhead and message complexity while maintaining complete information for handover decision.
Data Source
AI summary
A communication method and apparatus, the method including obtaining, by a master access network device, handover triggering condition information of one or more cells corresponding to at least one candidate secondary access network device, sending a first message to a terminal device, where the first message comprises the handover triggering condition information, and receiving a first response message from the terminal device, where the first response message is used to indicate a cell identifier of a second cell corresponding to a second secondary access network device in the at least one candidate secondary access network device, and the second cell meets a handover triggering condition indicated by handover triggering condition information of the second cell.