IAB Node DU Migration Through Dynamic F1 Interface Setup
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Solution Overview
Problem
The existing 5G mobile communication systems face challenges in providing flexible and economical backhaul solutions for densely deployed small cells, especially in remote areas where optical fiber deployment is difficult and costly, and there is a lack of specific solutions for DU migration in continuous partial migration processes in IAB networks.
Innovation Solution
A communication method and apparatus that provides a trigger condition for the first CU to determine whether to perform DU migration in IAB nodes, enabling the setup of an F1 interface with a third CU, and supports DU migration through logical DU generation and resource configuration for F1 interfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a large quantity of small cells are densely deployed to satisfy ultra-high capacity requirement, then network capacity is improved, but construction cost and difficulty increase due to costly fiber backhaul deployment
Solution Approach 1:
The patent replaces the mechanical fiber backhaul deployment system with a wireless backhaul system using IAB technology. The IAB node enables wireless transmission for both access links and backhaul links, substituting the need for physical fiber deployment in densely deployed small cell scenarios, thereby reducing construction cost and difficulty while maintaining high network capacity.
Solution Approach 2:
The IAB node acts as an intermediary between the core network and densely deployed small cells. It provides wireless backhaul connectivity to multiple small cells, enabling them to connect to the core network without individual fiber connections, thus reducing overall construction cost while supporting high network capacity.
2Area of stationary object
If optical fiber is deployed to provide network coverage in remote areas, then coverage is improved, but deployment cost and difficulty increase
Solution Approach 1:
The patent replaces the mechanical fiber deployment system with a wireless backhaul system in remote areas. The IAB node provides wireless connectivity to extend network coverage to remote areas without requiring costly and difficult optical fiber deployment, thereby improving coverage while reducing deployment cost and difficulty.
3Adaptability or versatility
If DU migration is performed in IAB nodes during cross-CU handover, then network flexibility is improved, but system complexity increases due to F1 connection management
Solution Approach 1:
The patent implements dynamic DU migration capabilities in IAB nodes, allowing the DU to be migrated between different CUs based on network conditions and handover requirements. This dynamic adjustment enables network flexibility for various scenarios (full migration, partial migration, continuous partial migration) while managing F1 connection complexity through standardized procedures.
Solution Approach 2:
The patent segments the base station functionality into separate CU and DU components in the IAB node, allowing independent migration of the DU while the CU remains stationary. This segmentation enables flexible DU migration across different CUs while maintaining clear F1 connection management boundaries, thus improving network flexibility without excessive system complexity.
Data Source
AI summary
This application provides multiple communication methods. In one example method, a distributed unit (DU) of an IAB node sends a first message, where the first message includes an ID that identifies an MT of the IAB node in a third CU, and an ID of the third CU; and optionally sends a fourth message to a first CU, where the fourth message comprises a base station identifier of the third CU, and the fourth message indicates that an F1 interface between the DU of the IAB node and the third CU has been set up.