Remote Storage for IoT Network Reformation
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Solution Overview
Problem
Low Power and Lossy Networks (LLNs) face challenges such as lossy links, low bandwidth, limited memory and processing capabilities, and instability due to environmental changes, making network reformation after power outages time-intensive and suboptimal.
Innovation Solution
Implementing remote storage on devices protected against power outages to store and provide network metrics, allowing for quicker and more optimal network reformation by selecting stable routing links and reducing the need for costly link quality estimates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If network devices perform link quality estimates and store metrics locally, then routing decisions can be made, but devices with limited memory and processing capability cannot maintain network state during power outages
Solution Approach 1:
A remote storage device acts as an intermediary between network devices and power outage conditions. The remote device stores network metrics and device states, allowing network devices to retrieve this information after power outages without requiring local storage capacity. This mediator resolves the contradiction by externalizing the storage burden from constrained devices.
Solution Approach 2:
The solution moves storage capacity from the constrained dimension (device memory) to an external dimension (remote storage system). By transitioning from local device storage to remote network storage, the system overcomes the memory limitation of individual devices while maintaining network reformation reliability.
2Measurement precision
If network devices perform complete link quality estimates after power outages, then accurate routing can be established, but the process becomes time-intensive and consumes excessive resources
Solution Approach 1:
Network metrics and link quality information are pre-calculated and stored in remote storage before power outages occur. When devices resume operation, they can directly retrieve this pre-computed information without performing time-consuming link quality estimates, thus maintaining measurement accuracy while dramatically reducing network reformation time.
Solution Approach 2:
Instead of performing complete link quality estimates after power outages, devices copy previously stored metric information from remote storage. This copying approach maintains measurement precision by using accurate historical data while avoiding the time and resource expenditure of重新 performing measurements.
3Adaptability or versatility
If devices store comprehensive network metrics locally, then optimal routing decisions can be made, but the device complexity and resource requirements increase
Solution Approach 1:
The remote storage device serves as an intermediary that handles the complexity of storing and managing comprehensive network metrics. Individual network devices can make optimal routing decisions by querying this external storage system without bearing the burden of maintaining complex local storage and processing infrastructure.
Solution Approach 2:
The remote storage device provides universal access to network metrics for multiple network devices simultaneously. This multi-functional approach allows any device in the network to retrieve comprehensive routing information without each device needing its own complete local copy, reducing individual device complexity while maintaining routing decision quality.
Data Source
AI summary
In one embodiment, a device that is protected against a power outage event in a network receives metrics used by a first node in the network to select a routing link to a second node in the network. The device stores the metrics used by the first node to select the routing link to the second node. The device selects a set of one or more of the metrics to provide to the first node during network formation after a power outage event in the network. The device provides the selected set of one or more of the metrics to the first node, wherein the first node uses the provided set to reestablish connectivity to the network.