Conditional Cell Handover in Dual Connectivity Networks
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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 handover triggering condition information from secondary access network devices and sends it to a terminal device, enabling proactive handovers to improve success rates and flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the network device sends a handover message to control terminal device handover, then handover control is achieved, but handover success rate is low due to fast channel attenuation and terminal movement
Solution Approach 1:
The patent applies preliminary action by pre-configuring conditional handover information including multiple candidate target cells and their corresponding execution conditions before handover is needed. The terminal device stores this information and automatically executes handover when conditions are met, eliminating the need for real-time network messaging during fast fading scenarios. This resolves the contradiction by preparing handover in advance when channel conditions are good, ensuring successful handover even when channel quality deteriorates rapidly.
2Adaptability or versatility
If the network device controls handover by sending handover messages, then centralized control is maintained, but flexibility and speed of cell changing are reduced
Solution Approach 1:
The patent implements self-service by enabling the terminal device to autonomously execute handover based on pre-configured conditions without requiring real-time network control messages. The terminal device monitors cell conditions, evaluates execution conditions against measured parameters, and automatically triggers handover to appropriate target cells. This resolves the contradiction by granting the terminal device decision-making autonomy, significantly improving flexibility and speed while reducing network device complexity in managing fast handovers.
3Reliability
If conventional handover mechanism is used in dual connectivity scenario, then basic handover functionality is provided, but handover success rate needs urgent improvement
Solution Approach 1:
In dual connectivity scenarios, the patent applies preliminary action by pre-configuring conditional handover information for both master node and secondary node cell groups. The terminal device stores multiple candidate target cells with execution conditions and automatically executes handover when conditions are met, ensuring successful handover in DC scenarios despite fast fading and movement. This resolves the contradiction by preparing handover in advance, significantly improving both success rate and efficiency in dual connectivity operations.
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.