Smart Radio LTE Failover: Testing

Smart Radio LTE Failover: Testing

Testing

As a first test, we performed a hard disconnect on the Mesh Rider signal while pinging one radio from the other. The ping was performed at a 1 second interval with a 1 second timeout. From the results, only one sequence number was missing (sequence #9) indicating that the failover time is about 1 to 2 seconds. The latency on the LTE link was more than 100ms while the Mesh Rider’s latency was around 2ms. The results are shown below.





Fig. 3 Mesh Rider LTE hard failover ping test

We also ran a test to check the failover and recovery  of the network when the nodes are moving away from each other and the Mesh Rider signal strength is gradually descreasing. The RSSI and IFACE is plotted on the primary axis of Fig 4. When the IFACE value is high, it means that the Mesh Rider interface was being used, and when the IFACE value is low, it means the LTE interface was being used. In the experiment, 10 dB attenuators were added to each radio to reduce the scale of the test. As can be seen, at lower RSSI values, the network fails over to LTE and then recovers again to use the Mesh Rider. This illustrates the added resiliency in the network by using the best of the interface available at any time. 




Fig. 4 – Failover Results

 

References

[1]   M2MOne, https://www.m2mone.co.nz/, 14 June 2021

[2]   Gl-inet Mudi, https://www.gl-inet.com/products/gl-e750/, 14 June 2021

[3]   Installing Wireguard on Routers Running Openwrt and Luci, https://www.azirevpn.com/support/guides/router/openwrt/wireguard, 14 June 2021

[4]   OpenVPN, https://openvpn.net/, 14 June 2021

[5]   WireGuard, https://www.wireguard.com/, 14 June 2021

[6]   Linux L2TP ethernet pseudowires, https://remote-lab.net/linux-l2tp-ethernet-pseudowires, 14 June 2021

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