IAB Node Uplink Backhaul Mapping for Multi-DU Handover
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Solution Overview
Problem
In multi-hop IAB networks, existing technologies fail to support IAB-nodes with two or more DUs during IAB-DU migration, affecting packet data convergence protocols and radio resource control connections for mobile IABs.
Innovation Solution
Configure a first and second distributed unit (IAB-DU) in an IAB-node with uplink backhaul mapping information from different donor central units, enabling simultaneous support for multiple DUs through dual active protocol stacks and BAP configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If an IAB-node supports only a single DU in existing technologies, then the device complexity is reduced and configuration is simpler, but the adaptability is limited and seamless handovers during long-distance movements cannot be supported
Solution Approach 1:
The IAB-node is segmented to support multiple independent DUs (first DU and second DU), each capable of independent operation and connection to different donor CUs. This segmentation allows the node to function as multiple entities simultaneously, enabling seamless handovers while maintaining manageable complexity through modular architecture.
Solution Approach 2:
The IAB-node is designed with multi-functionality to support both first DU and second DU operations within a single device. The node can universally handle multiple protocol stacks, BAP configurations, and donor CU connections, making it adaptable to various network scenarios including long-distance movements and handovers.
2Reliability
If dual active protocol stacks and BAP configurations are implemented to support multiple DUs, then seamless handovers are enabled, but the device complexity increases
Solution Approach 1:
The IAB-node implements dynamic configuration where dual active protocol stacks and BAP parameters can be flexibly activated or deactivated based on operational needs. The node dynamically switches between different DU configurations and donor CU connections, maintaining reliability during handovers while managing complexity through on-demand activation.
Solution Approach 2:
The system changes operational parameters dynamically by configuring different BAP parameters, routing identities, and protocol stack states depending on which DU is currently active. This parameter-based control allows the node to maintain multiple configurations without permanently committing to complex structures, reducing overall device complexity while ensuring connection stability.
Data Source
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AI summary
Embodiments of the present application provide a signal transceiving method and apparatus and a communication system. A configuration information apparatus is applied to an IAB node, the apparatus comprises a first processing unit, and the first processing unit controls the node, so that the node performs the following operations: a first distributed unit (IAB-DU) and a second distributed unit (IAB-DU) in the node are respectively configured with uplink backhaul mapping information by different donor central units; and a mobile terminal of the node transmits a signal according to the uplink backhaul mapping information.