Mobile IAB Connectivity Mode Switching for Backhaul Loss
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Solution Overview
Problem
Wireless backhaul connectivity issues in mobile integrated access and backhaul (IAB) nodes, such as vehicle-mounted IAB nodes, lead to communication disruptions and inefficiencies, particularly when moving through areas where connectivity is lost, impacting UE operations.
Innovation Solution
Mobile IAB nodes support multiple network connectivity modes, including IAB operations, non-IAB relay operations, and repeater operations, and transmit control messages to parent nodes to switch to alternative modes when backhaul connectivity is lost, ensuring continued communication with UEs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If mobile IAB nodes use traditional single-mode backhaul connectivity, then the network structure is simple, but connectivity reliability deteriorates when moving through areas with signal loss
Solution Approach 1:
The mobile IAB node is configured to support multiple network connectivity modes (first network connectivity mode, second network connectivity mode, third network connectivity mode) simultaneously or alternately. This multi-functionality allows the node to maintain communication with UEs even when traditional backhaul connectivity is lost, by switching to alternative modes such as direct UE-to-UE communication or relay operations, thereby resolving the contradiction between reliability and complexity.
2Reliability
If mobile IAB nodes switch to alternative network connectivity modes when backhaul connectivity is lost, then communication continuity is improved, but signaling overhead increases
Solution Approach 1:
The mobile IAB node transmits a control message to the parent IAB node in advance to indicate support for multiple network connectivity modes and to receive authorization before actual connectivity failure occurs. This preliminary action allows the system to pre-configure alternative communication paths and authorization parameters, so when backhaul connectivity is lost, the node can switch modes more quickly with reduced signaling overhead, as the framework and authorization are already in place.
3Adaptability or versatility
If mobile IAB nodes implement multiple network connectivity modes, then adaptability to different communication scenarios is improved, but power consumption increases
Solution Approach 1:
The mobile IAB node dynamically selects and switches between different network connectivity modes based on real-time communication conditions and requirements. The node operates in the most energy-efficient mode when possible and only switches to alternative modes when necessary (e.g., when backhaul connectivity is lost or when higher adaptability is required). This dynamic operation allows the system to maintain low power consumption during normal conditions while providing high adaptability when needed, resolving the contradiction between versatility and energy usage.
Data Source
AI summary
Methods, systems, and devices for wireless communication are described. A mobile wireless node (e.g., a mobile integrated access and backhaul (IAB) node) may transmit a control message to a parent wireless node indicating one or more supported network connectivity modes. A network connectivity mode may provide network connectivity to one or more user equipments (UEs) via the mobile wireless node when wireless backhaul connectivity is lost between the mobile wireless node and the parent wireless node. The parent wireless node may authorize the mobile wireless node to use a first network connectivity mode, and the mobile wireless node may communicate with a first UE in accordance with the first network connectivity mode. In this way, the mobile wireless node may use a network connectivity mode to extend coverage of a network to the first UE even if the first UE is outside of the coverage area of the network.