IAB Node Resource Coordination for Multi-Hop Donor Handover
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently handling multi-hop relays and resource management in integrated access and backhaul (IAB) networks, particularly in high-frequency radio communication systems with limited signal coverage, necessitating improved resource configuration and traffic management.
Innovation Solution
The method involves transmitting and receiving resource configurations and traffic information between IAB nodes and donors using various interface signaling, including F1, Xn, and NG interfaces, to facilitate efficient resource allocation and migration of distributed units (DUs) in IAB networks, ensuring reliable and flexible communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If multi-hop backhauling is used to extend coverage in high-frequency bands, then coverage area is improved, but network complexity and resource configuration difficulty increase
Solution Approach 1:
The patent segments the IAB node functionality into MT (Mobile Terminal) and DU (Distributed Unit) components. The MT handles access link resource configuration while the DU handles backhaul link resource configuration. This segmentation allows independent optimization of each function and simplifies the overall resource management in multi-hop networks by dividing the complex configuration task into manageable parts.
Solution Approach 2:
The patent introduces an intermediary mechanism where the MT's resource configuration serves as a reference for determining the DU's resource configuration. The first IAB donor uses the first resource configuration (received from the second IAB donor for the MT) as input to determine the second resource configuration for the DU. This intermediary approach ensures coordinated resource allocation across access and backhaul links without requiring direct complex interaction between all network elements.
2Reliability
If resource configurations are coordinated between MT and DU in IAB nodes, then communication reliability is improved, but configuration complexity and signaling overhead increase
Solution Approach 1:
The patent applies preliminary action by having the MT resource configuration established first (through handover command from second IAB donor) before determining the DU resource configuration. The first IAB donor receives the first resource configuration for the MT, then uses it as a basis to determine the second resource configuration for the DU. This sequential approach ensures that resource coordination is built upon a already-established reference configuration, reducing the complexity of simultaneous multi-parameter optimization.
Solution Approach 2:
The patent implements feedback mechanisms where resource configuration information flows bidirectionally between network elements. The first resource configuration for the MT is fed back to the first IAB donor, which then uses this feedback to determine the appropriate second resource configuration for the DU. This feedback loop ensures that resource allocations are coordinated and consistent across different links while maintaining manageable complexity through iterative refinement.
Data Source
AI summary
Embodiments of the present disclose a wireless communication in an IAB network. The method performed by an IAB node may include: transmitting, to a first LAB donor, a first resource configuration for a mobile terminal (MT) of the IAB node, wherein a distributed unit (DU) of the IAB node is connected to the first IAB donor and the MT of the IAB node is connected to or is for handing over to the second IAB donor; and receiving, from the first IAB donor, a second resource configuration for the DU of the IAB node, wherein the second resource configuration is determined based on the first resource configuration.