IAB Conditional Reconfiguration for Low-Interruption Handover
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Solution Overview
Problem
Existing wireless communication networks face challenges in efficiently managing handovers in integrated access and backhaul (IAB) scenarios, particularly in heterogeneous environments with diverse radio access technologies, leading to suboptimal performance and user experience.
Innovation Solution
Implementing conditional reconfiguration methods in IAB to dynamically adjust network configurations based on real-time conditions, ensuring seamless handovers and optimized resource allocation across different radio access technologies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional handover methods are used in IAB networks, then handover procedures can be completed, but handover performance is suboptimal and causes service interruptions
Solution Approach 1:
The patent implements conditional handover by pre-configuring multiple candidate target nodes and their corresponding handover conditions before handover is needed. When a handover event occurs, the IAB node can immediately execute the pre-prepared handover configuration that meets the current conditions, avoiding the time-consuming process of selecting and configuring target nodes during the handover event itself.
Solution Approach 2:
The patent introduces dynamic condition-based handover selection where the handover target is not predetermined but dynamically selected based on real-time network conditions. The IAB node continuously monitors conditions such as signal quality, load status, and topology changes, and dynamically determines the optimal target node from pre-configured candidates, making the handover process adaptive to changing network states.
2Speed
If handover configurations are pre-prepared for multiple candidate target nodes, then handover execution speed improves, but message signaling overhead increases
Solution Approach 1:
The patent applies local quality by preparing handover configurations with different levels of detail for different candidate target nodes. Instead of fully configuring all possible parameters for every candidate, the patent configures only the essential parameters locally at each candidate node, and reserves detailed configuration for the ultimately selected target. This reduces the overall signaling overhead while maintaining fast handover execution capability.
3Productivity
If IAB nodes release child nodes during handover, then resource allocation is optimized, but connectivity stability deteriorates
Solution Approach 1:
The patent implements preliminary child node release by releasing child nodes from the source IAB node before the actual handover completes. This allows the child nodes to be pre-associated with the target IAB node, so when the handover executes, the connectivity transition is smoother and resource allocation is more efficient. The child nodes are released in advance but remain in a suspended state until the handover is finalized.
Data Source
AI summary
The disclosure pertains to methods and apparatus for a mobility action in IAB in wireless communication networks. A method implemented in a Wireless Transmit/Receive Unit (WTRU) may comprises the steps of: determining traffic load information associated with a parent node; measuring received power of candidate parent nodes; selecting a candidate parent node based on the measured received power; performing a mobility action to the selected candidate parent node based on the determined traffic load information; and transmitting, to a child node, a message, the message comprising an information indicating the selected candidate.