Mobile IAB Node Migration Signaling for Service Continuity
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Solution Overview
Problem
Existing wireless communication systems face challenges in managing the migration of mobile IAB-nodes due to potential revocation of node/traffic migration and UE handover requests, particularly in mobile communications networks like 5G, leading to service interruptions.
Innovation Solution
Implement signaling mechanisms to prioritize resource requests for mobile IAB-nodes by identifying them as such, incorporating indications of mobility status, served user equipment, and quality-of-service levels, enabling efficient resource allocation and migration management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If mobile IAB-node migration is implemented to enhance network flexibility and coverage, then network adaptability and service continuity are improved, but the risk of migration revocation and service interruption increases
Solution Approach 1:
The patent applies preliminary action by establishing a preliminary indication mechanism that identifies mobile IAB-nodes before migration occurs. The source donor-CU marks the IAB-node as mobile in the handover request message before the actual migration, allowing the target donor-CU to prepare appropriate resource allocation and prevent revocation in advance, thus maintaining service continuity while enabling network flexibility.
2Device complexity
If standard handover procedures are used for IAB-nodes, then protocol simplicity is maintained, but mobile IAB-node specific resource allocation issues arise leading to migration revocation
Solution Approach 1:
The patent applies local quality by introducing a specific indication mechanism only for mobile IAB-nodes within the existing handover protocol, rather than redesigning the entire protocol. The mobile indication is added locally in the handover request message and processed specifically by the target donor-CU, allowing differentiated resource allocation for mobile nodes while maintaining overall protocol simplicity.
3Measurement precision
If mobile IAB-node identification is added to handover messages, then resource allocation accuracy is improved, but message complexity increases
Solution Approach 1:
The patent applies the taking out principle by extracting the mobile identification indication as a separate, dedicated field within the handover request message. This extracted indication element carries specific information about mobile IAB-node status, enabling accurate resource allocation decisions by the target donor-CU while maintaining clear message structure and minimizing overall message complexity.
Data Source
AI summary
There is provided a method for use in a process for requesting resources by a source Integrated Access and Backhaul (IAB) topology from a target IAB topology of a communication system, each of the source IAB topology and the target IAB topology comprising a set of IAB nodes and a donor Central Unit (CU), the method at the source donor-CU of the source IAB topology comprising: transmitting a message to the target donor-CU relating to the request of the resources associated with an IAB-node of the source IAB topology; wherein the message comprises an indication identifying the IAB-node of the source IAB topology as a mobile IAB-node. A corresponding method at the target donor, and devices are also disclosed.