IAB Radio Link Failure Reporting Through Dual Connectivity
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Solution Overview
Problem
In integrated access and backhaul networks, radio link failure (RLF) leads to unstable connections, preventing the integrated access and backhaul donor node from effectively scheduling and configuring network resources due to failed reconnection attempts between IAB-nodes.
Innovation Solution
A method for handling RLF by implementing dual connectivity, where nodes transmit failure reports through secondary links to donor nodes, allowing for network resource scheduling and reconfiguration based on these reports.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If IAB-node uses single link connectivity to donor node, then device complexity is reduced, but reliability deteriorates due to unstable wireless links
Solution Approach 1:
The patent introduces dual connectivity by establishing two independent links (first link and second link) between IAB-node and donor node, transitioning from single-link to multi-link architecture. This dimensional expansion provides alternative transmission paths, improving connection stability when one link experiences radio link failure.
2Reliability
If failure report transmission is implemented through secondary link, then reliability of resource scheduling is improved, but device complexity increases due to additional reporting mechanisms
Solution Approach 1:
The patent uses the second link as an intermediary channel for transmitting failure reports from IAB-node to donor node. This mediator approach ensures that failure information can be conveyed even when the primary first link is compromised, enabling reliable resource scheduling without requiring complex direct feedback mechanisms.
3Reliability
If dual connectivity is implemented, then network resilience is improved, but ease of operation deteriorates due to additional configuration requirements
Solution Approach 1:
The patent configures dual connectivity and establishes both first link and second link before any failure occurs. This preliminary setup ensures that when radio link failure happens, the alternative path is already in place and can be activated immediately, improving network resilience without requiring complex real-time configuration changes.
Data Source
AI summary
A method for handling radio link failure and a device are disclosed. The method includes: obtaining a first failure report, where the first failure report indicates that a first node has received a notification of backhaul recovery failure from a parent node of the first node, or the first failure report indicates that link failure has occurred in a first link, where the parent node of the first node is in the first link; and transmitting the first failure report to a donor node through a second link. In the embodiments of the present invention, when RLF occurs in a radio link, a failure report can be reported to a donor node through a node configured with dual connectivity, so that the donor node can schedule and configure network resources based on the failure report.