Dual-Connectivity Mobility Commands for Seamless Node Handover
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently managing mobility enhancements, particularly in scenarios involving dual connectivity, where user equipment (UE) needs to perform seamless handovers between multiple nodes while maintaining conditional mobility commands without reconfiguration.
Innovation Solution
A method and apparatus for a secondary node (SN) in a wireless communication system that stores and manages a list of conditional mobility commands, allowing for efficient handover decisions based on received configurations from a master node (MN), enabling the SN to acknowledge and execute mobility commands proactively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the UE performs inter-base station mobility with conditional mobility commands, then mobility efficiency is improved, but the complexity of managing and transmitting mobility commands increases
Solution Approach 1:
The patent segments the mobility management by separating MN mobility and SN mobility into independent conditional mobility commands. The MN mobility command handles master node handover while the SN mobility command handles secondary node changes, allowing each to be managed independently without interfering with the other, thus improving mobility efficiency while maintaining manageable complexity
Solution Approach 2:
The patent implements preliminary action by pre-configuring conditional mobility commands for both MN and SN mobility before actual handover occurs. The UE stores multiple conditional mobility commands with associated execution conditions, allowing rapid execution when conditions are met, thereby improving mobility efficiency without requiring complex real-time decision-making during handover
2Adaptability or versatility
If the SN stores multiple conditional mobility commands, then mobility flexibility is improved, but the memory and processing requirements increase
Solution Approach 1:
The SN pre-configures and stores multiple conditional mobility commands with associated execution conditions before handover events occur. This allows the UE to have mobility flexibility for both MN and SN changes while the SN maintains control over the commands, optimizing the balance between flexibility and resource requirements
Solution Approach 2:
The conditional mobility command structure is designed to be universal, serving multiple functions: it handles both MN mobility and SN mobility scenarios, works with different handover conditions, and can be applied across various dual connectivity configurations. This multi-functionality reduces the need for separate command structures for different scenarios, optimizing memory and processing requirements
Data Source
AI summary
The present disclosure relates to mobility enhancement. According to various embodiments, a method performed by a secondary node (SN) establishing dual connectivity (DC) with a master node (MN) for a user equipment (UE) in a wireless communication system comprises the steps of: storing a list of conditional mobility commands for SN mobility of the UE from the SN to a target SN; on the basis of the MN mobility of the UE being initiated from the MN to the target MN, receiving, from the target MN, an SN addition request message including settings for the target MN; on the basis of the settings for the target MN, determining one or more conditional mobility commands from the list of conditional mobility commands that remain available for the target MN even after the MN mobility; and in response to the SN addition request message, transmitting, to the target MN, an SN addition request acknowledge (ACK) message including the one or more conditional mobility commands.