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Author Topic: VMM profile and mesh roaming in rough environments (Outdoor)  (Read 2666 times)

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Offline rodrigo.olivares

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VMM profile and mesh roaming in rough environments (Outdoor)
« on: February 07, 2014, 08:49:13 AM »
Hi, I hope you are all fine!

I'm working on a laboratory with 1 RFS4010 and 3 APs 7161 (WING 5.5.1 firmware all of them). Two APs configured as root and the other one as a VMM.

Following differents manuals and guides, I created the VMM profile considering this:

Disable layer 2 stateful packet inspection from the firewall policy.
Set the RTS threshold value to 1 on all mesh devices.
Use Opportunistic as the rate selection settings
Radio placement = Outdoor
Disable Dynamic Chain Selection (radio setting).
Disable A-MPDU Aggregation for vehicular speed greater than 30 mph
Misconfiguration recovery time = 0
Path method = mobile-snr-leaf on the meshpoint settings
Smart RF policies disabled (to simplify testing)

Is there another setting that I have missed to get the VMM profile ?

The tests

The idea is to simulate the behavior of a VMM moving in rough outdoor conditions, I mean, losing signal suddenly from its root path but still being covered from another neighbors with good SNR to roam to them.

Currently I have had succes reducing the root radio power at which the VMM is connected to, and increasing the radio power of its neighborg. The roaming was seamless (0 packets loss) in every test.

Then I tried to simulate a sudden signal loss taking out the antenna from the root AP at wich the VMM is connected to force the roam to its neighborg, but in every test the results were variable, I had packet loss from 2 to 8 seconds until recovered connectivity. (I'm working in 1x1 antenna configuration to simplify tests)

Then in every "antenna re-installation" the roam was perfect (0 packet loss).

Is there a way to optimize roaming time in the case of a sudden signal loss? The manuals mention several parameters of Path Method Hysteresis that I don't understand well, do you have any experience on similar cases ?

Thank you so much for your help!

PS: Sorry the extensive topic and my english
« Last Edit: February 07, 2014, 02:44:13 PM by rodrigo.olivares »