Relay Node Link Failure Recovery in IAB Communication Control
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Solution Overview
Problem
Existing mobile communication systems face challenges in efficiently managing radio link failures between relay nodes, particularly in integrated access and backhaul (IAB) nodes, leading to disruptions in communication links.
Innovation Solution
A communication control method where a relay node detects a failure in the first radio link and sends a notification to the lower node, allowing the lower node to maintain a secondary radio link while attempting recovery, with predefined processing steps and a timer to manage resource usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the relay node immediately releases the second radio link upon detecting a failure in the first radio link, then the system responds quickly to the failure, but the lower node loses communication connectivity during the recovery period
Solution Approach 1:
The lower node performs preliminary actions by maintaining the second radio link in a suspended state and executing predetermined processing (such as measuring neighbor cells) while keeping the link intact. This allows the lower node to prepare for potential handover or reconnection without immediately breaking the connection, thus maintaining reliability while enabling quick response when needed.
2Reliability
If the lower node maintains the second radio link indefinitely after receiving the first notification, then communication connectivity is preserved, but system resources are wasted
Solution Approach 1:
The system implements feedback through the timer mechanism. The lower node continuously monitors the timer status and automatically releases the second radio link when the timer expires without successful recovery. This feedback loop ensures that resources are not indefinitely consumed while maintaining connectivity during the recovery period, balancing reliability with resource efficiency.
Solution Approach 2:
The timer introduces a periodic check mechanism where the lower node evaluates whether to maintain or release the second radio link at predetermined intervals. Instead of indefinite maintenance, the system periodically assesses the recovery status and makes decisions based on whether the predetermined time period has elapsed, thus preventing continuous resource consumption.
3Reliability
If the relay node attempts recovery procedures after detecting failure, then the radio link may be restored, but communication disruption occurs during the recovery process
Solution Approach 1:
The second radio link serves as an intermediary communication path during the recovery process. When the first radio link fails, the lower node can maintain communication through the second radio link while the relay node attempts recovery procedures. This intermediary link prevents complete communication disruption and reduces the effective loss of time during recovery.
Data Source
AI summary
A communication control method includes, by a relay node relaying communication between a lower node and an upper node, detecting a failure in a first radio link between the upper node and the relay node, by the relay node, in response to the detection of the failure, transmitting, to the lower node, a first notification indicating the detection of the failure and attempting recovery of the first radio link, and, by the lower node, executing predetermined processing in a state of maintaining a second radio link with the relay node until a predetermined time period elapses after reception of the first notification from the relay node.