IAB Node Mobility Handover in Dual Connectivity Networks
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Solution Overview
Problem
The challenge in wireless communication systems is the efficient management of mobility for wireless base stations, particularly in dual connectivity scenarios, where integrated access and backhaul nodes require seamless handover and selection of appropriate target nodes during mobility events.
Innovation Solution
A method and apparatus for a master node in dual connectivity systems to manage mobility by receiving an integrated access and backhaul node indication, selecting a target secondary node supporting IAB functions, and initiating a SN change procedure through an SN addition request message.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a wireless base station performs mobility in dual connectivity scenario, then the base station can maintain service continuity and expand coverage, but it becomes difficult to select an appropriate target node that supports IAB functions
Solution Approach 1:
The source secondary node determines a suitable target secondary node before the mobility event occurs, and pre-configures the necessary IAB-related information. This preliminary determination ensures that when mobility is needed, the target node is already identified and capable of supporting IAB functions, thus resolving the contradiction between maintaining service continuity and selecting appropriate target nodes.
Solution Approach 2:
The master node acts as an intermediary that receives IAB node indications from the source secondary node and coordinates the selection and configuration of the target secondary node. This intermediary role ensures that the target node selection process properly accounts for IAB function requirements while maintaining the dual connectivity architecture, thus enabling both service continuity and appropriate target node selection.
2Productivity
If the system differentiates handling of migrating IAB nodes from normal UEs, then radio resource management is optimized for IAB nodes, but the system complexity increases
Solution Approach 1:
The system applies differentiated radio resource management policies specifically to IAB nodes based on the IAB node indication, while maintaining standard handling for normal UEs. This localized differentiation allows optimized resource management for IAB nodes without requiring complex system-wide changes, thus improving productivity while limiting the increase in system complexity.
Solution Approach 2:
The system uses parameter changes in the signaling messages (specifically the IAB node indication parameter) to trigger different handling procedures. When this parameter indicates an IAB node, the system activates specialized radio resource management procedures. This parameter-based approach enables differentiated treatment of IAB nodes without requiring fundamentally different system architecture, thus improving resource management efficiency while controlling system complexity.
Data Source
AI summary
The present disclosure relates to a mobility of a wireless base station in wireless communications. According to various embodiments, a method performed by a master node (MN) serving a wireless device with a source secondary node (SN) in a dual connectivity (DC) in a wireless communication system comprises: receiving, from the source SN, a message for initiating a SN change procedure, wherein the message comprises an integrated access and backhaul (IAB) node indication informing that the SN change procedure is related to a mobility of an TAB node; selecting a target SN supporting an TAB function based on the TAB node indication; transmitting, to the target SN, an SN addition request message comprising the TAB node indication; and receiving, from the target SN, an SN addition request acknowledge message.