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The problem analyze of the High channel utilization of the A project

Publication Date:  2017-07-31 Views:  57 Downloads:  0
Issue Description

Problem Description:

The high 2.4G channel utilization of A project without
user, which can reach 70%~90%, will affect the business.

Alarm Information



Trouble shooting process:


1、
Disable the 2.4G radio of Ruckus, the channel
change from 70% to less than 50%;


2、
After disable the 2.4G radio, set the channel of
the AP manual.

After set
the channel manual, there are still a lot of interface in channel 6 and channel
11. Check by the spectrum-analysis tools and FLUKE, there are a lot of
interface from channel 6 to channel 13.





By the
wireless data capture, there are a lot of 802.11 null data, by the 1M rate and
more than 1Kpps.




 


By the
wireless data capture, there are a lot of 802.11 null data, by the 1M rate and
more than 1Kpps.






 



Handling Process

By trace the signal
strength, finally we find the source of the interference:



After turn
off the terminal, the channel utilization of the cabanilla AP be normal.





Before


after.



 

Root Cause




Problem reason:



1、
There is the Ruckus AP in the same environment,
which will increase the channel utilization;



There are some interference  sources, the PAD which
will send large number of 802.11 null data packets with 1M rate, which will
increase the channel utilization. The PDA connect to the Ruckus AP.

Solution

shutdown ther interference source .

Suggestions

we  designed some warehouse network plan and send to customer .

 

END