IAB Inter-Donor Topology Discovery for Seamless Node Migration
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Solution Overview
Problem
In Integrated Access and Backhaul (IAB) networks, there is a challenge in inter-donor topology discovery during the migration of an IAB-node when the mobile termination (MT) and distributed unit (DU) components are not collocated, leading to a blind transfer of context between IAB-donors, which hinders effective communication.
Innovation Solution
Techniques for inter-donor topology discovery are implemented, allowing the IAB-node to inform or enable another IAB-donor about the context transfer, ensuring seamless communication by establishing signaling connections and transferring necessary information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the IAB-node establishes signaling connections with multiple IAB-donors during migration, then connectivity and communication continuity are improved, but the complexity of topology management and donor coordination increases
Solution Approach 1:
The patent introduces a topology discovery mechanism where the IAB-node acts as an intermediary to inform other IAB-donors about its signaling connections. When the IAB-node establishes a signaling connection with a first IAB-donor, it transmits an indication to other IAB-donors (e.g., second IAB-donor) about this connection. This intermediary approach enables coordinated multi-donor management without requiring complex direct communication between all donors, thus improving reliability while controlling complexity.
2Loss of information
If the IAB-node transmits indications to other IAB-donors about signaling connections, then topology discovery and context transfer accuracy are improved, but the signaling overhead and communication load increase
Solution Approach 1:
The patent extracts only the essential topology information needed for context transfer and transmits it as compact indications between IAB-donors. Instead of exchanging complete topology datasets, the system transmits specific indication messages about signaling connection status. This extraction approach minimizes signaling overhead while maintaining sufficient information accuracy for effective topology discovery and context transfer during IAB-node migration.
3Reliability
If the IAB-donor transfers context information during migration, then service continuity is improved, but the transfer time and migration duration increase
Solution Approach 1:
The patent implements preliminary topology discovery and indication transmission before the actual context transfer occurs. The IAB-node proactively informs other IAB-donors about its signaling connections in advance, allowing the target IAB-donor to prepare for context reception. This preliminary action enables the context transfer to proceed efficiently once initiated, reducing overall migration duration while maintaining service continuity through advance coordination.
Data Source
AI summary
Aspects of the present disclosure provide techniques for inter-donor topology discovery in an Integrated Access and Backhaul (IAB) network during migration of an IAB-node. A method that may be performed by a first IAB-donor includes establishing a first signaling connection with an IAB-node, receiving an indication that the IAB-node has a second signaling connection with a second IAB-donor, and in response to receiving the indication: transferring, to the second IAB-donor, information related to the IAB-node, re-establishing traffic between the first IAB-donor and the IAB-node via a topology of the second IAB-donor, or any combination thereof.