Wireless Backhaul Relay RLF Detection and Recovery
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Solution Overview
Problem
Wireless backhaul networks face challenges in managing radio link failures (RLFs) due to sudden link unavailability, leading to communication losses and delays, as central functions lack timely warning or advanced warning to manage interconnectivity between nodes effectively.
Innovation Solution
A relay device in the backhaul network monitors link quality and listens for alert messages, detecting RLFs by initiating recovery procedures through forward handover or activating redundant links, and sends alert messages to child nodes to suspend physical channels, allowing them to recover by establishing new wireless links with alternative parent relays or upstream backhaul devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a central function manages wireless links in the wireless backhaul network, then network control and coordination are improved, but response time to sudden radio link failures increases due to lack of advanced warning
Solution Approach 1:
The patent implements preliminary action by having relay devices proactively detect RLF conditions through monitoring wireless link quality and receiving alert messages from upstream backhaul devices before the failure fully impacts the network. This early detection enables the central function to prepare recovery measures in advance, reducing the actual response time when failures occur.
Solution Approach 2:
The patent implements feedback mechanisms where relay devices continuously monitor link quality and send alert messages to both the central function and child nodes about upstream RLF conditions. This feedback loop enables the central function to maintain awareness of network status and respond more effectively to failures, improving both reliability and response time.
2Loss of time
If relay devices monitor link quality and implement recovery procedures, then detection speed of RLF is improved, but device complexity increases
Solution Approach 1:
The patent implements self-service by enabling relay devices to autonomously detect RLF conditions through link quality monitoring and automatically execute recovery procedures such as forward handover or activating redundant links without requiring constant central function intervention. This self-service capability improves detection speed while the modular nature of the functions keeps complexity manageable.
Solution Approach 2:
The patent implements segmentation by dividing the RLF management functionality into distinct modular components: link quality monitoring, alert message processing, recovery procedure execution, and child node notification. This segmentation allows each function to be optimized independently, improving detection speed while maintaining manageable device complexity through organized, separable functional blocks.
3Reliability
If alert messages are sent to child nodes to suspend physical channels, then communication disruption is minimized, but information transmission is interrupted
Solution Approach 1:
The patent implements preliminary anti-action by having relay devices send alert messages to child nodes before fully suspending physical channels, allowing child nodes to prepare for the upcoming interruption. This early warning enables graceful handling of the suspension, minimizing communication disruption while managing information loss through proactive notification and coordination.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. A relay device may detect an upstream radio link failure (RLF) associated with an upstream link of a wireless backhaul, where the wireless backhaul includes a first wireless link between the relay device and a first upstream backhaul device. The relay device may provide a first indication of the upstream radio link failure over a second wireless link between the relay device and a first downstream device. The relay device may establish a third wireless link with a second upstream backhaul device based on the detected upstream radio link failure. The relay device may provide multiple-access services to one or more downstream devices, where providing the multiple-access services is based on backhaul communications between the relay device and the second upstream backhaul device over the third wireless link.