IAB Wireless Link Recovery Failure Messaging for Parent Selection
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Solution Overview
Problem
In integrated access backhaul (IAB) systems, the existing methods for handling radio link failure (RLF) in wireless relay networks do not provide adequate guidance for selecting appropriate parent nodes during link recovery, leading to potential service interruptions and inefficient reestablishment of backhaul links.
Innovation Solution
The proposed solution involves the use of a radio link recovery failure message with a message type indicator and optional identification information, such as BAP address IDs, to guide IAB nodes in selecting suitable parent nodes for reestablishing backhaul links, thereby reducing service interruptions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If existing RLF handling methods are used without specific guidance for parent node selection, then the system maintains simplicity in operation, but the service interruption time increases and backhaul link reestablishment efficiency decreases
Solution Approach 1:
The patent applies preliminary action by including identification information of suitable parent nodes in advance within the RLF message. When RLF occurs, downstream IAB nodes can immediately use this pre-provided information to select parent nodes without needing to perform complex search procedures, thereby reducing service interruption time while maintaining manageable message structure
Solution Approach 2:
The patent uses an intermediary approach by introducing a structured RLF message that carries parent node identification information as a mediator between the detection of link failure and the reestablishment process. This message structure acts as an intermediary carrier that bridges the gap between failure detection and rapid recovery, providing guidance without requiring complex real-time decision-making
2Productivity
If detailed guidance information is included in the RLF message to guide parent node selection, then the backhaul link reestablishment efficiency improves, but the message structure and processing complexity increase
Solution Approach 1:
The patent applies segmentation by dividing the RLF message into structured fields including message type indicator, identification information of the IAB node triggering the message, and optionally identification information of suitable parent nodes. This segmentation allows receiving nodes to process only the relevant fields needed for their specific function, reducing overall processing complexity while maintaining high reestablishment efficiency
Solution Approach 2:
The patent implements local quality by making the parent node identification information optional and location-specific within the message structure. Different parts of the network can choose to include or exclude this information based on their specific needs and capabilities, allowing efficient processing at each local node while providing detailed guidance where required
3Reliability
If the IAB node sends RLF notification to downstream nodes, then the downstream nodes can find new parent nodes, but the service interruption time increases due to notification and reestablishment procedures
Solution Approach 1:
The patent resolves this contradiction by applying preliminary action - the RLF message is designed to include identification information of suitable parent nodes in advance. This allows downstream IAB nodes to immediately switch to alternative parent nodes upon receiving the message, eliminating the need for time-consuming search procedures while maintaining reliable recovery through pre-validated parent node selections
Data Source
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AI summary
Embodiments of the present invention disclose a recovery failure processing method and apparatus for an integrated access backhaul radio link, and a communications device, and belongs to the field of communications technologies. A recovery failure processing method for an integrated access backhaul radio link, applied to an integrated access backhaul (IAB) node in an integrated access backhaul link, includes: sending, in a case that the radio link fails to recover, a radio link recovery failure message to a child IAB node, where the radio link recovery failure message includes a message type indicator, and the message type indicator indicates a message type of the radio link recovery failure message.