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Mobile stations switching between several access points (Bullet M2)

I have several mobile vehicles with M2 bullet radios moving around our facility sending data to a single PC in a large building.  Sometimes the mobile radios lose connection with a single M2 Access point due to blockage/ line of sight issues.

 

If I add a second Access point (as shown), will the mobile "stations" switch between access points as they move around the facility?  Should the access points both use the same SSID and channel?  Is there a better way to achieve my goal of having uninterrupted coverage as the vehicles move throughout the facility?

 

ubiquiti situation.png

 

 

 

SuperUser
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Re: Mobile stations switching between several access points (Bullet M2)

In general, wireless clients will scan for another access point

if they lose connection to the one they are on. This can take

a few seconds, depending on the client device. You can use

the same SSID, but a different channel to advoid interference.

Always use only channels 1, 6 and 11.

 

You don't show complete information or even dimensions of

the building, so it's difficult to advise. For example, this might

be better done with more than two radios, and WiFi radios

from the UniFi line instead of the lower-performing Bullet.   Dave


> HQ in Seacoast region New Hampshire U.S.A.
> Ubiquiti Certified Trainer [UCT] for:
     UBWA [AirMax] / UEWA [UniFi] / UBRSS [routers]
UBNT.NH@gmail.com
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Re: Mobile stations switching between several access points (Bullet M2)

Dave,

 

Thanks for the reply.  I was short on details because, well, things get complicated!

 

In reality, I'm doing this at our client's various sites (and I don't always know what they're going to be like).  Most of the time I've gotten away with a single Access Point, while other times we've had issues.  These are big industrial sites with large impenetrable structures that may or may not be in the most inconvenient spot!  Typically, we're set up for a week, then we're off to the next location.

 

We don't need huge amounts of bandwidth (1-mbps is usually my target), and maximizing range is usually a bigger consideration.    I've been using the 10MHz channel width for this reason.  Direction antennas are probably out of the question as we're going for 360-degree coverage.  I'm using 15db and 9db gain stick-antennas.  I'm not familiar with the UniFi line.  Can you suggest some radio models that I should consider?  I appreciate your help.

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Re: Mobile stations switching between several access points (Bullet M2)

UniFi is intended for WiFi service; Bullet--and the other AirMax

radios--were designed using 'WiFi' chipsets, but optimized for

links between AirMax radios--not for WiFi. Current AirMax

radios do not operate as WiFi devices at all.

 

It's difficult to advise you on radio models, for the same reasons

you describe: things change. I assume you are a 'crash team'

for inventories; if these were permanent solutions I would advise

you find a consultant, because each warehouse needs a design.

 

There are UniFi radios designed to use Ubiquiti MIMO omni antennas;

they are special versions of the AirMax Rocket. But unfortunately,

they are old models and have been deprecated--although still available.

 

At least consider the UniFi UAP-AC-M radio; it uses 'rubber-ducky'

antennas, and is dual-band MIMO. If you lock it into 5GHz band only,

it will operate on the Ubiquiti MIMO omni antennas. For more focused

coverage, you can add the UMA-D -- a broad directional antenna.   Dave


> HQ in Seacoast region New Hampshire U.S.A.
> Ubiquiti Certified Trainer [UCT] for:
     UBWA [AirMax] / UEWA [UniFi] / UBRSS [routers]
UBNT.NH@gmail.com
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Registered: 3 weeks ago

Re: Mobile stations switching between several access points (Bullet M2)

Thanks, Dave

 

My environment is actually around deepwater offshore structures.  It's a tricky environment, but one in which we can connect over 2+ km to communicate with vessels in the vicinity.  I wasn't trying to be cagey about that, but I didn't want to bore everyone with a situation that's not helpful to most people.

 

I've got some reading to do on the 5Ghz UniFi UAP-AC-M radios combined with the MIMO omni antenna.  Do you think the range I can expect is comparable to the Bullet M2s ? I used the handy-dandy AirOS Gain Matrix PDF to select the M2s with my omni antennas a while back, but I can't find an equivalent resource for the UniFi equipment.

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Re: Mobile stations switching between several access points (Bullet M2)

[ Edited ]

That 'boring' detail actually matters.

 

I don't advise you to use UniFi at all for what seem to

be radio links under somewhat difficult conditions. I

would definitely use MIMO radios though, due to the

high variability of the link path.

 

For Ubiquiti this means AirMax, such as Rocket 5AC.

There's no WiFi 'roaming' but the radios can use more

than one channel and scan to a second one if the first

one fails.  Dave


> HQ in Seacoast region New Hampshire U.S.A.
> Ubiquiti Certified Trainer [UCT] for:
     UBWA [AirMax] / UEWA [UniFi] / UBRSS [routers]
UBNT.NH@gmail.com