Backhaul Radio Link Failure Notification Triggering in IAB Networks
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Solution Overview
Problem
Current mechanisms for generating backhaul link radio link failure notifications in Integrated Access and Backhaul (IAB) networks often lead to 'RLF indication storms,' consuming resources and posing security risks due to excessive transmissions and lack of security protection.
Innovation Solution
Implementing a method to selectively trigger backhaul link radio link failure notifications based on specific conditions and timer states, such as timer expirations, RRC connection reconfigurations, and integrity check failures, to prevent unnecessary notifications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If backhaul link radio link failure notifications are transmitted whenever RLF is detected, then network reliability is improved through timely failure notification, but resource overhead increases and indication storms occur
Solution Approach 1:
The patent applies dynamics by making the notification transmission behavior adaptive rather than static. The IAB-node dynamically adjusts whether to transmit BH RLF indications based on real-time conditions: whether it has a parent node, whether it has descendant nodes, and the current operational state. This dynamic behavior prevents unnecessary transmissions while ensuring critical notifications are sent, resolving the contradiction between reliability and resource overhead.
Solution Approach 2:
The patent changes the parameters governing notification transmission from a simple binary trigger to a multi-parameter decision process. Key parameters include: presence of parent node, presence of descendant nodes, operational state, and timer status. By evaluating multiple parameters before transmission, the system avoids indication storms while maintaining necessary reliability, thus reducing resource overhead without sacrificing network reliability.
2Reliability
If backhaul link radio link failure notifications are transmitted frequently to ensure network reliability, then failure detection speed is improved, but security risks increase due to excessive transmissions
Solution Approach 1:
The patent applies preliminary anti-action by implementing preventive measures before security issues can arise from excessive transmissions. The conditional transmission logic pre-empts unnecessary notifications by checking whether the IAB-node has parent nodes and descendant nodes before transmitting. This preliminary filtering prevents the generation of excessive indication messages that could lead to security vulnerabilities, while still ensuring timely failure detection when actually needed.
Solution Approach 2:
The patent introduces intermediary conditions as mediators between RLF detection and notification transmission. These intermediaries include: the existence of parent nodes, the existence of descendant nodes, operational state checks, and timer status. These intermediary conditions filter out spurious or unnecessary notifications, reducing security risks associated with excessive transmissions while maintaining reliable failure detection through appropriate notifications.
3Loss of information
If unconditional BH RLF indications are sent upon RLF detection, then notification completeness is improved, but device complexity increases due to multiple transmission conditions
Solution Approach 1:
The patent applies preliminary action by performing necessary checks before the actual notification transmission. The IAB-node preliminarily evaluates critical conditions: whether parent nodes and descendant nodes exist, and whether the operational state warrants notification. This preliminary evaluation ensures that only necessary notifications are transmitted, maintaining notification completeness for critical cases while avoiding unnecessary complexity from transmitting all possible scenarios.
4Speed
If BH RLF notifications are transmitted without timer-based control, then response speed is improved, but resource waste increases due to repeated notifications
Solution Approach 1:
The patent applies periodic action by introducing timer-based control into the notification transmission process. The T311 timer creates a periodic evaluation mechanism: the node checks whether notification conditions are met at specific time intervals rather than continuously or immediately upon every RLF event. This periodic action maintains fast response speed by using a reasonably configured timer value while preventing resource waste from repeated or redundant notifications during the timer period.
Data Source
AI summary
Embodiments of this disclosure provide a method and apparatus for triggering to generate a backhaul link radio link failure notification. The method is applicable to a first node and includes: when a radio link failure is detected and when a first condition is satisfied and/or based on a state of a timer, triggering or not triggering to generate a backhaul link radio link failure notification; or, triggering or not triggering to generate a backhaul link radio link failure notification based on a state of a timer; or, when a first condition is satisfied, triggering or not triggering to generate a backhaul link radio link failure notification based on a state of a timer.