IAB Node Backhaul Link Failure Recovery Coordination
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Solution Overview
Problem
Current wireless communication networks face challenges in efficiently managing and recovering from backhaul link failures, leading to potential service interruptions and inefficient network reorganization.
Innovation Solution
The implementation of a mechanism where a first radio network node performs an initial recovery procedure for a backhaul link failure and, upon determining its failure or prolonged duration, triggers a second recovery procedure for connected radio network nodes and wireless devices, allowing them to initiate their own recovery processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a centralized recovery procedure is performed by a single radio network node, then coordination and control are simplified, but service interruption time increases and network recovery efficiency decreases
Solution Approach 1:
The centralized recovery procedure is segmented into distributed recovery procedures executed by multiple radio network nodes independently. Each node performs recovery for its connected wireless devices simultaneously, dividing the single long recovery process into multiple parallel shorter processes, thereby reducing total service interruption time while maintaining coordination through standardized procedures.
Solution Approach 2:
Radio network nodes perform preliminary actions by preparing recovery configurations and maintaining backup connection parameters before failure occurs. When backhaul link failure happens, nodes can immediately initiate recovery using pre-prepared configurations, reducing the time needed for service restoration without increasing operational complexity.
2Loss of information
If a radio network node waits for recovery procedure completion before notifying connected nodes, then information accuracy is improved, but notification delay increases
Solution Approach 1:
A feedback mechanism is implemented where the first radio network node continuously monitors recovery procedure status and provides real-time notifications to second radio network nodes. This allows connected nodes to be informed of recovery status without waiting for complete confirmation, reducing notification delay while maintaining information accuracy through continuous status updates.
Solution Approach 2:
The first radio network node performs preliminary notification actions by informing second radio network nodes about ongoing recovery procedures before completion is confirmed. This preliminary notification allows connected nodes to prepare for potential service restoration without waiting for full recovery confirmation, reducing delays while maintaining accurate status information through subsequent updates.
Data Source
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AI summary
A method performed by a first radio network node, such as a relay node also denoted as IAB node, for handling communication in a wireless communications network is provided. The wireless communications network comprises the first radio network node relaying data packets between a network node and a wireless device. The first radio network node decides (1702) upon a failure of a first recovery procedure of a connection or upon loss of the connection at the first radio network node, to trigger an initiation of a second recovery procedure of a second connection at a second radio network node and/or the wireless device. The first radio network node then transmits (1703) to the second radio network node and/or the wireless device, an indication for triggering the initiation of the second recovery procedure of the second connection.