Wifi roaming even client is not moving

[Ha Dao]

Recently some user at a area in my office complain me their phones disconnect and reconnect many times. They just only stay in a room. We have APs both front and back of that room. And i found that client is roaming between 2 AP (1 front and 1 back the room). It happen every 1 - 2 minutes.

From coreswitch i ping client IP with 5000 packets, and client roaming 4 times:

I am using WLC 5520, Software 8.7.106.0 and AP AIR-AP1815M-B-K9

Can you give me some advice, your best practices in roaming optimization

Tks

[Leo Laohoo]

@Ha Dao wrote:

Software 8.7.106.0

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I would strongly recommend avoiding this particular firmware version. 

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@Ha Dao wrote:

Recently some user at a area in my office complain me their phones disconnect and reconnect many times. They just only stay in a room. We have APs both front and back of that room. And i found that client is roaming between 2 AP (1 front and 1 back the room). It happen every 1 - 2 minutes.

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Is this happening to only one phone/user?

[Ha Dao]

Tks Leo
What OS version you recommend to me ?
That issue happens to every phones in 2 rooms side by side

[Leo Laohoo]

Is there any reason why you need 8.7.X.X?
Otherwise, 8.5 MR5 or MR6 are good and so is the latest 8.8.X.X and 8.10.X.X.
Avoid 8.6.X.X, 8.7.X.X and 8.9.X.X.

[Ha Dao]

OK, I am going to update to 8.10.121.0 ED . Hope it s working well. Tks

[Haydn Andrews]

Cisco best practices for VoWIFI are here:

https://www.cisco.com/c/en/us/td/docs/wireless/controller/8-1/Enterprise-Mobility-8-1-Design-Guide/Enterprise_Mobility_8-1_Deployment_Guide/Chapter-9.html