IAB Node RLF Indication for Inter-CU Handover
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In integrated access and backhaul (IAB) communication systems, during inter-centralized unit (inter-CU) recovery or handover, IAB child nodes or terminal equipment may fail to update configuration information, leading to communication issues with the target CU, as they do not actively initiate reestablishment processes or update security keys when the serving IAB node does not change.
Innovation Solution
The IAB child node or terminal equipment receives indication information from a network device to initiate a radio link failure recovery or connection reestablishment process, and updates configuration information based on received configuration details of the target CU, ensuring proper communication with the target CU even if the serving IAB node remains unchanged.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the IAB child node or terminal equipment does not actively initiate reestablishment when the serving IAB node does not change, then the device complexity is reduced, but the reliability of communication with the target CU deteriorates
Solution Approach 1:
The patent applies preliminary action by having the IAB node proactively notify child nodes and terminal equipment about upcoming inter-CU recovery or handover before it occurs. This advance notification allows these devices to prepare and initiate reestablishment processes in advance, ensuring they can properly communicate with the target CU after the CU changes, thus resolving the contradiction between reduced complexity and maintained reliability.
2Loss of information
If the IAB child node or terminal equipment does not update configuration information such as security keys, then the loss of information is reduced, but the adaptability to the target CU deteriorates
Solution Approach 1:
The patent implements feedback by establishing a notification mechanism where the IAB node informs child nodes and terminal equipment about inter-CU recovery or handover events. This feedback loop ensures that devices receive timely information about CU changes and can accordingly update their configuration information including security keys, achieving both information retention and adaptability to the new CU.
3Productivity
If the IAB node performs inter-CU recovery or handover without notifying child nodes, then the productivity of the recovery process is improved, but the reliability of child node communication deteriorates
Solution Approach 1:
The patent applies preliminary action by having the IAB node send notifications to child nodes and terminal equipment before the inter-CU recovery or handover occurs. This allows receiving devices to prepare in advance, ensuring seamless communication after the CU change without delaying the recovery process, thus maintaining both productivity and reliability.
Data Source
AI summary
An integrated access and backhaul (IAB) communication method includes detecting, by an IAB node, that on a backhaul link between the IAB node and a parent node, a radio link failure (RLF) occurs or a radio link failure (RLF) recovery is successful, or a radio link failure (RLF) recovery is failure, and transmitting, by the IAB node, RLF indication information to an IAB child node or a terminal equipment by using a Backhaul Adaptation Protocol (BAP) control Protocol Data Unit (PDU), the RLF indication information being used for indicating one of at least two backhaul radio link failure (BH RLF) types.