IAB DU Migration F1 Setup via Donor-CU Configuration Transfer
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Solution Overview
Problem
In 5G mobile communication systems, the integration of IAB technology faces challenges in establishing the F1 interface between a target donor-CU and a DU when the target donor-CU is different from the CU accessed by the MT, particularly in scenarios involving DU migration without MT migration.
Innovation Solution
A method and apparatus that facilitate the target donor-CU to obtain downlink configuration information for the F1 interface by generating and sending specific information to request the necessary configuration from a second CU, utilizing identification information and binding relationships between the MT and DU to establish the interface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If DU migration is performed without MT migration, then the F1 interface can be reconfigured to a target donor-CU, but the target donor-CU cannot obtain the downlink configuration information needed for transmission over the F1 interface
Solution Approach 1:
The source donor-CU acts as an intermediary to transfer the downlink configuration information from the second CU (MT's current serving CU) to the target donor-CU. This mediator approach enables the target donor-CU to obtain necessary configuration information without requiring MT migration, thus resolving the information loss problem while maintaining DU migration flexibility
Solution Approach 2:
The source donor-CU performs preliminary action by proactively obtaining the downlink configuration information from the second CU before the F1 interface is fully reconfigured to the target donor-CU. This preliminary transfer ensures that the target donor-CU has all necessary information ready for seamless F1 interface setup
2Reliability
If full IAB-node migration (both MT and DU) is performed, then all configuration information can be transferred, but the migration complexity and signaling overhead increase
Solution Approach 1:
The invention extracts only the essential downlink configuration information needed for F1 interface transmission from the complete IAB-node configuration. By taking out only the necessary information (downlink configuration) rather than migrating the entire node configuration, the solution reduces migration complexity and signaling overhead while maintaining configuration completeness for the F1 interface
Solution Approach 2:
The migration process is segmented into two independent parts: MT migration (which can be partial or full) and DU migration with F1 interface reconfiguration. This segmentation allows the F1 interface configuration to be handled separately through the source donor-CU information transfer mechanism, reducing the coupling between MT and DU migration processes
Data Source
AI summary
This application provides a communication method. This application may be applied to DU migration in an IAB network. The method includes: generating first information, where the first information indicates a third CU to request, from a second CU, downlink configuration information used for transmission over an F1 interface, there is an RRC connection between the second CU and an MT of a relay node, and the third CU is a target donor-CU of a DU of the relay node; and sending the first information to the third CU.