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What to do if I see a lot of co channel 5GHz interference

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  • 1.  What to do if I see a lot of co channel 5GHz interference

    Posted Apr 05, 2022 02:53 PM
    Just did a walkaround with an Ekahau Sidekick. 
    Its reporting significant co-channel interference.

    Unless I override ARM, what are my options?
    a) remove some of the floorplan's APs
    or 
    b) lower their transmit power
    or 
    c) enable DFS channels? (not an option)


    This is a 13 year old building, 15 feet between floors. Metal studs, drywall.
    We steer to 5GHz.



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    Russell Fabry
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  • 2.  RE: What to do if I see a lot of co channel 5GHz interference

    EMPLOYEE
    Posted Apr 05, 2022 03:48 PM
    D>  Use 20mhz wide channels

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    Any opinions expressed here are solely my own and not necessarily that of Hewlett Packard Enterprise or Aruba Networks.
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  • 3.  RE: What to do if I see a lot of co channel 5GHz interference

    Posted Apr 06, 2022 09:53 AM
    Thanks C,

    When I suggest this to my higher ups, what should I concede going from 40 mhz width to 20 will cost us, aside from lower potential throughput speeds? Anything else?


    will let you know

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    Russell Fabry
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  • 4.  RE: What to do if I see a lot of co channel 5GHz interference

    Posted Apr 07, 2022 02:18 AM

    Hi!

    I wouldn't lower transmit power that will have impact on coverage. You want to to go 20mhz wide channels as CJoseph says. It better to have clean air than a lot of CCI or OBSS. What kind of requirements do you have? I have yet to see a project where 20mhz is not enough to run the payload.

    Regards Fredrik



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    Fredrik Lehmann
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  • 5.  RE: What to do if I see a lot of co channel 5GHz interference

    Posted Apr 07, 2022 10:51 AM
    Nothing special, requirement-wise. 
    Thanks Fredrik

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    Russell Fabry
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  • 6.  RE: What to do if I see a lot of co channel 5GHz interference

    MVP EXPERT
    Posted Apr 07, 2022 03:29 PM
    To avoid co-channel interference:

    1. Make design first ;)
    2. Lower tx-power
    2. use smaller channels
    3. use more channels (why don't use DFS channels?)
    4. correct ap placement (horizontal)
    5. remove ap's
    6. disable dual 5ghz if AP support it (like a AP-340)

    If you have secondair AP coverage the negative impact of DFS/RADAR events should be minimal because a client can easily roam to another channel when a event occur. Off course keep an eye on the arm/airmatch event logging for RADAR events, but i cant believe all channels are effected continue.

    Also make sure your coverage requirements in Ekahau, what do you set as "co-channel interference at minimum signalstrenght" (should be arround -85dBm).

    How many co-channel interference do you have? When your channel utilization stays low it doesn't have much impact.


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    Marcel Koedijk | MVP Expert 2022 | ACEP | ACMP | ACCP | ACDP | Ekahau ECSE | Not an HPE Employee | Opinions are my own
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  • 7.  RE: What to do if I see a lot of co channel 5GHz interference

    Posted Apr 19, 2022 12:29 PM
    Marcel,

    4. correct ap placement (horizontal)
    5. remove ap's

    -- good advice,
    I do see a few spots where I'd like to try that-- how long before ARM will "recalibrate" to the changes I make in access point arrangement? Is there a way to trigger ARM to let it know it needs to update the radio values for the environment I'm physically reconfiguring?  




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    Russell Fabry
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