Conditional Reconfiguration for IAB Node Migration
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Solution Overview
Problem
Integrated access and backhaul (IAB) nodes experience prolonged migration times, leading to potential radio link failure and service interruptions, especially when the radio link deteriorates rapidly, causing user experience issues.
Innovation Solution
A conditional reconfiguration mechanism is introduced to select and execute conditional reconfiguration on suitable cells, reducing service interruption time by dynamically adapting to link quality changes and optimizing migration processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If IAB-node migration is performed using traditional reconfiguration methods, then the network can adapt topology changes, but service interruption time is prolonged and radio link failure risk increases
Solution Approach 1:
The patent applies preliminary action by pre-configuring candidate target cells and their associated measurement configurations before migration is needed. The network device configures multiple candidate cells with their measurement settings in advance, so when migration becomes necessary, the IAB-node can immediately start evaluating and executing reconfiguration to a pre-prepared target cell, significantly reducing service interruption time and avoiding radio link failure.
Solution Approach 2:
The patent implements dynamics by enabling the IAB-node to dynamically select and switch between different candidate target cells based on real-time link quality measurements. The system transitions from a static single-target reconfiguration to a dynamic multi-target evaluation process, where the IAB-node can adaptively choose the optimal target cell that minimizes migration impact and maintains radio link stability during topology changes.
2Productivity
If traditional reconfiguration procedures are used for IAB-node migration, then migration can be executed, but service interruption increases and user experience deteriorates
Solution Approach 1:
The network device pre-configures multiple candidate target cells with their measurement settings and reconfiguration parameters before migration is needed. This preliminary configuration allows the IAB-node to immediately begin evaluation and execution without waiting for on-demand configuration, significantly accelerating migration efficiency and reducing service interruption time.
Solution Approach 2:
The patent ensures continuity of useful action by maintaining ongoing measurement and evaluation processes for multiple candidate cells simultaneously. The IAB-node continuously monitors link qualities of candidate cells and prepares reconfiguration commands in advance, so that when migration triggers, the transition can proceed continuously without idle waiting periods, thereby reducing overall service interruption time.
3Speed
If rapid link quality deterioration occurs during migration, then migration speed increases, but radio link failure risk increases
Solution Approach 1:
The system pre-configures multiple candidate target cells with their measurement settings before rapid deterioration occurs. When link quality deterioration is detected, the IAB-node can immediately evaluate pre-prepared candidate cells and execute rapid reconfiguration to a suitable target, achieving both fast migration speed and maintained reliability by having backup options ready in advance.
Solution Approach 2:
The patent applies beforehand cushioning by configuring multiple candidate target cells as backup options before radio link failure occurs. These pre-configured candidates act as a cushion or safety buffer, allowing the IAB-node to quickly switch to an alternative target cell if the primary target fails or if rapid deterioration is detected, thereby preventing radio link failure while maintaining migration speed.
Data Source
AI summary
An apparatus for conditional reconfiguration, applicable to at least one of a first IAB-node, a child IAB-node of the first IAB-node and a terminal equipment served by the first IAB-node or the child IAB-node, includes a memory, and a processor coupled to the memory and configured to select one of first cell(s) fulfilling conditional reconfiguration condition(s) from conditional reconfiguration candidate cells as a second cell, and initiate conditional reconfiguration execution on the second cell.