IAB Node BAP Header Rewriting for Inter-Donor Link Failure
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Solution Overview
Problem
In integrated access and backhaul (IAB) systems with inter-donor dual connections, there is a challenge in handling link failures effectively, particularly when radio link failures (RLFs) occur in one of the dual connections, leading to potential routing failures.
Innovation Solution
The proposed solution involves a method for an IAB node to manage link failures by obtaining configuration information that includes backhaul adaptation protocol (BAP) header rewriting information. Upon detecting an RLF in one link, the node identifies an alternative link from the configuration information and routes packets over the available link, thereby preventing routing failures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If dual connectivity is established with multiple donor CUs for load balancing and redundancy, then system reliability and service continuity are improved, but device complexity and link failure handling difficulty increase
Solution Approach 1:
The patent applies preliminary action by pre-configuring alternative path information and BAP header rewriting rules in the IAB node before link failure occurs. The configuration includes multiple donor CU identities, routing identifiers, and rewriting rules that enable immediate switch to alternative paths without complex real-time decision-making when failure occurs.
Solution Approach 2:
The patent introduces BAP header rewriting as an intermediary mechanism that automatically redirects packets when link failure is detected. The rewriting rule acts as a mediator that transforms packet headers to route through alternative donor CUs, simplifying the failure handling process without requiring complex control plane signaling.
2Adaptability or versatility
If BAP header rewriting is performed for packet routing in inter-donor dual connection, then packet forwarding flexibility is improved, but processing complexity and error risk increase
Solution Approach 1:
The patent applies local quality by implementing BAP header rewriting only at the boundary IAB node where inter-donor dual connection is established, rather than throughout the entire network. This localized approach provides the necessary routing flexibility at the critical point while keeping processing complexity confined to a single node.
Solution Approach 2:
The patent changes BAP header parameters (routing identifiers, donor CU identities) dynamically based on link availability. When primary link fails, the IAB node modifies packet header parameters to redirect through secondary donor CU, providing routing flexibility through parameter transformation rather than complex protocol changes.
3Loss of time
If alternative path configuration is maintained for rapid failover, then link failure recovery time is reduced, but configuration complexity and memory requirements increase
Solution Approach 1:
The patent maintains alternative path configuration in advance with pre-defined routing identifiers and BAP rewriting rules for multiple donor CUs. This preliminary configuration enables immediate failover by simply activating pre-prepared routing rules rather than computing alternative paths in real-time, reducing recovery time while keeping configuration manageable.
Data Source
AI summary
The present disclosure relates to: a communication technique for combining IoT technology with a 5G communication system for supporting a higher data transmission rate than 4G systems; and a system therefor. The present disclosure can be applied to intelligent services (for example, smart home, smart building, smart city, smart car or connected car, healthcare, digital education, retail, security- and safety-related services, etc.) on the basis of 5G communication technology and IoT-related technology. Disclosed in the present disclosure are a method and device which can prevent a packet routing failure in a backhaul and access haul combination system.