Gradual IAB Node Migration via Context Transfer
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Solution Overview
Problem
Current wireless communication systems, particularly in Integrated Access and Backhaul (IAB) networks, face challenges in efficiently managing handover processes between base stations, leading to potential packet loss and resource allocation inefficiencies during the migration of child nodes.
Innovation Solution
The implementation of a method that involves determining the migration of a child node from a source logical IAB-DU to a target logical IAB-DU, where context information and traffic mapping configurations are shared between base stations to facilitate a gradual and efficient handover, reducing packet loss and optimizing resource allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a child node is migrated from a source logical IAB-DU to a target logical IAB-DU in an IAB network, then resource allocation efficiency is improved, but packet loss occurs during the handover process
Solution Approach 1:
The source base station sends context information and traffic mapping configuration to the target base station before the child node actually switches from the source logical IAB-DU to the target logical IAB-DU. This preliminary setup ensures that the target base station is ready to immediately continue traffic forwarding without interruption, preventing packet loss during handover while enabling efficient resource reallocation.
2Reliability
If context information and traffic mapping configuration are shared between base stations during handover, then handover seamlessness is improved, but system complexity increases
Solution Approach 1:
The patent extracts and separates the context information and traffic mapping configuration from the detailed handover execution process. By pulling out these essential elements and transferring them independently to the target base station beforehand, the system achieves seamless handover while keeping the actual handover mechanism relatively simple and manageable.
3Productivity
If gradual migration is implemented in IAB networks, then resource management efficiency is improved, but handover process time increases
Solution Approach 1:
The source base station performs preliminary actions by sending context information and traffic mapping configuration to the target base station before the actual handover execution. This allows the target base station to be pre-configured and ready, enabling the child node to switch quickly between logical IAB-DUs without prolonged handover delays, thus achieving both gradual resource migration and fast handover execution.
Data Source
AI summary
Aspects of the present disclosure provide techniques for handover in an Integrated Access and Backhaul (IAB) network or other type of network. One example method which may be performed by a source base station (BS) includes: determining to migrate a child node from a first logical IAB-distributed unit (DU) of an IAB-node to a second logical IAB-DU of the IAB-node, wherein the first logical IAB-DU is associated with the source BS, and wherein the second logical IAB-DU is associated with a target BS; sending, to the target BS, context information of the child node served by the first logical IAB-DU in response to the determination; and indicating, to the target BS, a traffic mapping configuration at the IAB-node associated with the context information and a backhaul connection of the IAB-node.