Mobile IAB Node Uplink Mapping for Multi-DU Handover
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Solution Overview
Problem
In multi-hop IAB networks, existing technologies do not effectively support IAB-nodes with two or more DUs during migration and handover, affecting packet data convergence protocols and RRC connections for mobile IABs.
Innovation Solution
Configuring a first and second distributed unit (IAB-DU) in an IAB-node with uplink backhaul mapping information from different donor central units, enabling simultaneous support for multiple DUs and using common or separate default BAP configurations for signal transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If an IAB-node supports two or more DUs during migration and handover, then the adaptability and versatility of the IAB-node is improved, but the device complexity increases due to the need to manage multiple uplink backhaul mapping information and BAP configurations from different donor central units
Solution Approach 1:
The patent segments the BAP configuration management by introducing separate default BAP configuration sets for each DU (first default BAP configuration for first DU, second default BAP configuration for second DU). This segmentation allows each DU to have its own dedicated configuration parameters, simplifying the overall management complexity while enabling multi-DU support during migration and handover operations.
Solution Approach 2:
The patent applies preliminary action by pre-configuring multiple uplink backhaul mapping information and default BAP configurations in the IAB-node before migration and handover operations begin. The IAB-node stores multiple sets of configuration parameters (first and second default BAP configurations) in advance, allowing seamless switching between DUs during migration without requiring complex real-time configuration management.
2Reliability
If separate default BAP configurations are used for each DU, then the reliability of communication during migration is improved, but the device complexity increases due to maintaining separate configuration sets
Solution Approach 1:
The patent segments BAP configuration into DU-specific default configurations (first default BAP configuration for first DU, second default BAP configuration for second DU). This segmentation ensures that each DU has dedicated configuration parameters, improving communication reliability during migration by preventing configuration conflicts while maintaining manageable complexity through structured organization.
Solution Approach 2:
The patent applies local quality by assigning different default BAP configuration parameters specifically tailored to each DU's requirements. The first DU uses first default BAP configuration with its own uplink backhaul mapping information, while the second DU uses second default BAP configuration with its own mapping information, optimizing each DU's performance independently while maintaining overall system reliability.
3Device complexity
If common default BAP configuration is used for multiple DUs, then the device complexity is reduced, but the adaptability to different donor central units deteriorates
Solution Approach 1:
The patent implements dynamics by making the BAP configuration system adaptable and switchable. The IAB-node can dynamically select between first and second default BAP configurations based on which DU is currently active. This dynamic switching capability provides adaptability to different donor central units while maintaining configuration management simplicity through a unified switching mechanism rather than permanently maintaining multiple independent configuration sets.
Data Source
AI summary
An apparatus for transmitting and receiving signals, applicable to a mobile integrated access and backhaul (IAB) node, includes: first processor circuitry controlling the IAB node so that the IAB node executes the following: configuring a first logical mobile IAB distributed unit (IAB-DU) and a second logical mobile IAB distributed unit (LAB-DU) in the node respectively with uplink backhaul mapping configuration by different IAB-donor central units; and transmitting signals by a mobile termination of the node (IAB-MT) according to the uplink backhaul mapping configuration.