IAB Node Migration Cell Identifier Allocation for Seamless Handover
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In Integrated Access and Backhaul (IAB) networks, there is no existing solution for updating the topology when the IAB donor connected to an IAB node changes, specifically in allocating and transmitting candidate cell identifiers to sub-nodes and terminals during IAB node migration.
Innovation Solution
A method and device for transmitting candidate cell identifiers from a source IAB donor-CU to a target IAB donor-CU, enabling the source IAB donor-CU to send these identifiers to sub-nodes and terminals, facilitating cell measurement and handover after migration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the IAB node migrates to a target IAB donor-CU, then the network topology is updated and service continuity is maintained, but there is no existing solution for allocating and transmitting candidate cell identifiers to sub-nodes and terminals
Solution Approach 1:
The source IAB donor-CU acts as an intermediary to receive the candidate cell identifier from the target IAB donor-CU and forward it to sub-nodes and terminals. This mediator approach enables information transmission across the migration boundary without requiring direct communication between target donor-CU and all downstream entities, thus resolving the information loss problem during topology updates.
Solution Approach 2:
The candidate cell identifier is allocated and prepared in advance by the target IAB donor-CU before the actual migration occurs. The source IAB donor-CU receives this identifier beforehand and can then distribute it to sub-nodes and terminals in preparation for the handover, ensuring that all necessary information is available when migration is executed.
2Reliability
If the source IAB donor-CU transmits candidate cell identifiers to all sub-nodes and terminals, then seamless handover is enabled, but the signaling overhead and complexity increase
Solution Approach 1:
The candidate cell identifier is segmented into different parts or levels for distribution. The source IAB donor-CU receives the identifier and selectively transmits relevant portions to sub-nodes and terminals based on their specific needs and positions in the network hierarchy, reducing unnecessary signaling while ensuring handover capability.
Solution Approach 2:
The candidate cell identifier mechanism is designed to serve multiple functions simultaneously: it enables handover for terminals, provides topology update information for sub-nodes, and maintains compatibility with existing network structures. This multi-functionality reduces the need for separate mechanisms for different purposes, thereby managing complexity.
Data Source
AI summary
The present application relates to the field of wireless communications and provides an information transmission method and a device thereof. In the present application, a source IAB donor centralized unit (CU) of an IAB node receives first candidate cell identifiers from the IAB node or first candidate cell identifiers from a target IAB donor CU of the IAB node, the first candidate cell identifiers being allocated for the IAB node migrating to the target IAB donor CU, and the first candidate cell identifiers including candidate cell identifiers of a sub node of the JAB node and/or a terminal connected to the IAB node; and the source IAB donor CU sends a second candidate cell identifier to the sub node of the IAB node and/or the terminal connected to the IAB node, the second candidate cell identifier including at least one of the first candidate cell identifiers.