IAB Network Inter-Donor Switching for Coordinated Topology Adaptation
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently managing inter-donor topology adaptation in integrated access and backhaul networks, particularly in 5G and NR systems, which require flexible deployment of denser NR cell networks without increasing conventional transmission network elements.
Innovation Solution
Implementing methods and systems for inter-donor topology adaptation in IAB networks, including message exchanges between source and migrating IAB nodes, child nodes, and target donor CUs to manage inter-CU switching, ensuring seamless handover and configuration of IAB nodes and UEs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If inter-donor switching is implemented in IAB networks, then network flexibility and deployment efficiency are improved, but message exchange complexity and handover coordination overhead increase
Solution Approach 1:
The handover process is segmented into distinct phases: source donor initiates switching, migrating IAB node relays messages to child nodes, target donor receives feedback, and configuration is applied. This segmentation allows complex inter-donor switching to be managed through structured, modular message exchanges between specific node pairs, reducing overall system complexity while maintaining flexibility.
Solution Approach 2:
The source donor sends a preliminary indication message to the migrating IAB node before the actual handover occurs. This preliminary action allows the migrating node to prepare by forwarding the switching indication to its child nodes and coordinating with the target donor in advance, ensuring seamless handover while managing complexity through staged communication.
2Productivity
If inter-donor topology adaptation is implemented, then deployment efficiency of denser NR cell networks is improved, but handover coordination overhead and processing time increase
Solution Approach 1:
The handover process maintains continuous useful action by having the migrating IAB node immediately forward the switching indication to its child nodes upon receiving it from the source donor. This continuous action ensures that all affected nodes are notified and can prepare simultaneously, reducing overall handover coordination time while enabling efficient topology adaptation.
Solution Approach 2:
The migrating IAB node autonomously handles the forwarding of switching indications to its child nodes and the coordination of feedback collection without requiring direct intervention from the source or target donors for each individual node. This self-service approach reduces coordination overhead and accelerates the handover process by delegating local coordination to the migrating node itself.
3Reliability
If feedback information collection from downstream nodes is implemented, then handover reliability is improved, but message exchange overhead and network complexity increase
Solution Approach 1:
The system implements feedback by having downstream nodes (child nodes of the migrating IAB node) send feedback information to the target donor regarding their readiness and status for the inter-donor switching. This feedback mechanism ensures that the handover is reliable and coordinated, as the target donor can assess the state of all affected nodes before completing the topology adaptation, while maintaining manageable complexity through structured feedback collection.
Data Source
AI summary
Methods, systems, and devices for inter-donor topology adaptation in integrated access and backhaul (IAB) networks are described. An example method for wireless communication includes transmitting, by a source donor, a first message comprising an indication that a migrating IAB node is configured to perform an inter-donor switching operation, and receiving a second message comprising feedback information, wherein the source donor is communicatively coupled to the migrating IAB node and a plurality of nodes that are downstream from the migrating IAB node.