Mobile IAB Handover Preparation for Low-Latency Backhaul Switching
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Solution Overview
Problem
The challenge of providing seamless and efficient handovers for mobile Integrated Access and Backhaul (IAB) nodes in mass transit scenarios, such as high-speed trains and buses, due to the need for fast, reliable wireless communication services amidst challenging propagation conditions and frequent changes in network connectivity.
Innovation Solution
Implementing a system where a source parent node prepares and configures a handover for a mobile IAB node by establishing a neighbor parent list, determining triggering conditions, and setting up communication tunnels with target parent nodes, ensuring minimal disruption and efficient resource use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If handover preparation is performed in real-time when M-IAB node approaches target parent node, then handover reliability is improved, but handover latency increases
Solution Approach 1:
The source parent node performs handover preparation actions in advance by generating a neighbor parent list and identifying potential target parent nodes before the M-IAB node actually needs to hand over. This preliminary configuration includes pre-establishing communication tunnels and preparing handover parameters, so that when handover is triggered, the execution is rapid and seamless, resolving the contradiction between reliability and latency.
2Reliability
If comprehensive neighbor parent list and triggering conditions are configured, then handover reliability is improved, but device complexity increases
Solution Approach 1:
The M-IAB node autonomously monitors its own trajectory and automatically detects when triggering conditions are met based on pre-configured parameters. The node independently initiates handover requests without requiring complex external control, simplifying the overall system complexity while maintaining reliable handover execution through self-monitoring and self-triggering mechanisms.
3Reliability
If multiple communication tunnels are established with target parent nodes, then network connectivity reliability is improved, but network resource consumption increases
Solution Approach 1:
Communication tunnels are selectively established only with specific target parent nodes that meet certain criteria (such as being in the neighbor parent list and satisfying triggering conditions). The source parent node configures tunnels locally and specifically where needed for upcoming handovers rather than establishing universal connectivity, optimizing resource usage while ensuring reliable connectivity paths are available when required.
Data Source
AI summary
A system may include a mobile integrated access and backhaul (M-IAB) base station configured to serve a set of user equipment (UE) devices; and a parent base station configured to establish a backhaul link for the M-IAB base station. The parent base station may be further configured to provide configuration data to the M-IAB base station that causes the M-IAB base station to report when a triggering condition for preparing a handover to a target parent node is satisfied; detect that the triggering condition is satisfied; and send, in response, a request to the target parent node to prepare the handover. The M-IAB base station may be further configured to detect that a handover condition is satisfied and send a handover request to the target parent node using the configuration data, in response to detecting that the handover condition is satisfied.