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Posts: 3
Registered: ‎04-12-2016

Unifi AP Zero Handoff Decision


Hello. I was just wondering what logic the APs use to make the roaming decision with ZH. My understanding is that ZH ignore the configurable minimum RSSI variable and thus must be using some other algorithim or logic. Just trying to find out what that is, also to help plan coverage/placement.

 

Thank you.

SuperUser
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Re: Unifi AP Zero Handoff Decision

First, the 'ZH' feature isn't not recommended in

the vast majority of deployments.

 

Second, the 'ZH' feature was intended to take the

burden of 'how it works' off your concerns. It

creates a 'synthetic access point' and handles

the details internally.

 

But you do need to be concerned about placement:

no system will handoff smoothly unless there is a

continuous coverage area between all access points.

So on the one hand, access points should be close

enough to each other for good field strength in all

locations. On the other hand, ZH requires that all

access points be on the same channel. That implies

that all access points not be so close to each other

that they cause excessive interference to each other.

 

This is a balancing game that is difficult to win. So

again: don't use 'ZH' unless there is a crucial reason.   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
New Member
Posts: 3
Registered: ‎04-12-2016

Re: Unifi AP Zero Handoff Decision

Its not a dense deployment. And there will be enough overlap in coverage so no dead spots that will lead to disconnection. I will also set the transmit power low enough to aid in roaming. Just trying to figure out if there is a certain RSSI value it looks for so I can aid in AP placement and use a site survey to help determine placement and proper transmit power. Also, I'm aware of the prereq that they operate on the same channel but that will not be an issue as its not a dense deployment and there will not be a heavy amount of clients connecting concurrently.

 

Thank you.

 

 

SuperUser
Posts: 41,330
Registered: ‎06-23-2009
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Re: Unifi AP Zero Handoff Decision

Set the positions and signal levels so the coverage

area is as even as reasonably possible; let the 'ZH'

internal functions handle the rest.   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
SuperUser
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Re: Unifi AP Zero Handoff Decision

Or skip ZHO, and let standard roaming do its thing. Man Happy
New Member
Posts: 3
Registered: ‎04-12-2016

Re: Unifi AP Zero Handoff Decision

Do the UAP AC Lite's support ZeroHandoff? I created a new WLAN group (left the default one intact) and set it for zero handoff and I created a new wireless network in it. However, it doesn't show in my list of WLAN groups I can assign an AP to. Am I missing something?

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Re: Unifi AP Zero Handoff Decision


jmder321 wrote:

Do the UAP AC Lite's support ZeroHandoff? I created a new WLAN group (left the default one intact) and set it for zero handoff and I created a new wireless network in it. However, it doesn't show in my list of WLAN groups I can assign an AP to. Am I missing something?


No.

 

 

Member
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Registered: ‎08-15-2011
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Re: Unifi AP Zero Handoff Decision

read this thread... which was going on about the same time....

 

http://community.ubnt.com/t5/UniFi-Wireless/Zero-Hand-off-wlan-group-nondefault/m-p/1537015#M155938

 

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