Multi-Interface IoT Device Network Switching
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Solution Overview
Problem
IoT devices in Low-Power and Lossy Networks (LLNs) face challenges in switching back to a preferred wireless access standard after a loss of coverage, often remaining on a secondary standard even when the preferred standard becomes available again, due to the inability to determine when the preferred standard is restored, leading to prolonged use of inferior data rates.
Innovation Solution
A device with multiple network interfaces monitors for the availability of the preferred wireless access standard using a secondary interface and instructs the primary interface to switch back once the preferred standard is identified as available, minimizing downtime and ensuring optimal connectivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the device uses a secondary wireless access standard after preferred standard becomes unavailable, then connectivity is maintained, but data rate deteriorates
Solution Approach 1:
The second network interface continuously monitors for the availability of the preferred wireless access standard before the device needs to switch back. This preliminary detection allows the system to prepare for switchover in advance, ensuring seamless transition back to the higher-data-rate preferred standard without interrupting ongoing data transmissions on the secondary standard.
2Productivity
If the device switches back to preferred standard immediately when available, then data rate improves, but data transmission interruption occurs
Solution Approach 1:
The system performs preliminary monitoring of the preferred standard's availability using the second network interface before initiating any switchover. This advance detection ensures that the device can switch back to the preferred standard at the optimal moment without interrupting ongoing data transmissions, as the second interface has already confirmed the preferred standard is ready to accept traffic.
Solution Approach 2:
The second network interface acts as an intermediary monitoring device that detects the availability of the preferred standard and triggers the switchover. This intermediary role allows the first interface to maintain stable data transmission on the secondary standard while the second interface independently verifies readiness of the preferred standard, coordinating the transition without causing transmission interruptions.
3Loss of time
If the device continuously monitors for preferred standard availability, then switchover timing improves, but energy consumption increases
Solution Approach 1:
The monitoring function is segmented and assigned to a dedicated second network interface, separate from the first interface that handles primary data transmission. This segmentation allows the monitoring operation to run independently with optimized resource allocation, reducing the energy overhead on the main data path while maintaining continuous detection capability for preferred standard availability.
Data Source
AI summary
In one embodiment, a device, having a first and a second network interface, detects a switchover by the first network interface from using a preferred wireless access standard to access a carrier network to using a second wireless access standard to access the carrier network. The device identifies when the preferred wireless access standard is again available from the carrier network using the second network interface and causes the first network interface to switch to using the preferred wireless access standard, based on identification by the second network interface that the preferred wireless access standard is again available from the carrier network.