IAB Distributed Unit Multi-CU Connection for Inter-Donor Migration
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Solution Overview
Problem
Existing technologies do not clearly outline how IAB-nodes should manage context and establish connections, particularly F1 connections, during inter-donor migration in integrated access and backhaul (IAB) scenarios.
Innovation Solution
A distributed unit (DU) of an IAB-node establishes connections with multiple centralized units (CUs) by creating a first connection with a first CU and a second connection with a second CU via the first CU, enabling seamless inter-donor migration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If an IAB-node establishes F1 connections to multiple CUs during inter-donor migration, then migration capability and adaptability are improved, but connection management complexity increases
Solution Approach 1:
The patent applies preliminary action by establishing the first F1 connection to a first CU before migrating to a second CU. The IAB-node proactively sets up the initial connection, maintains it during migration, and only then establishes the second connection to the target CU. This sequential approach prevents the complexity of managing multiple simultaneous connections while enabling smooth inter-donor migration.
2Reliability
If F1 connections are established during inter-donor migration, then migration seamlessness is improved, but signaling overhead increases
Solution Approach 1:
The patent implements continuity of useful action by maintaining the first F1 connection active throughout the migration process. Rather than tearing down the existing connection and establishing a new one, the system keeps the original connection operational while adding the second connection. This continuous connection approach ensures seamless migration with minimized signaling interruptions and reduced overall signaling overhead.
Data Source
Figure 1A
Figure 1B~2A
Figure 2B
AI summary
A distributed unit (DU) operating in a radio access network (RAN) for establishing a connection with a centralized unit (CU) operating in the RAN, (i) transmits (1802), to a first CU, a first interface message to establish a first connection between the DU and the first CU, and (ii) transmits (1804), to a second CU via the first CU, a second interface message to establish a second connection between the DU and the second CU via the first CU, to maintain the first connection and the second connection concurrently.