08-31-2015 10:38 PM - edited 07-05-2021 03:51 AM
Dear all
I need to execute Passive Site Surveys in order to get the wireless network design for different "only-wireless" offices. I have these requirements:
5GHz as primary frequency band. 2.4GHz available for legacy devices.
802.11ac Wave 1
20MHz (40MHz channels are possible in low density AP areas)
-65 dBm minimum signal strength
25 dB minimum SNR
25% RF Coverage Overlap
What do you think about the 25% RF Coverage Overlap? Are you using this cell overlap in your new deployments or still with 20%?
Thanks in advance.
Best regards,
Carolina
09-01-2015 02:41 AM
Check the site survey to determine whether the channel overlap is adequate for devices to roam to the next AP before the signal is lost from the previous AP. For example, based on the RF guidelines specified, you must use non-overlapping channels and allow at least 20 percent overlap with adjacent channels when phones are deployed in the 802.11b/g environment. For voice deployments, it is recommended that the cell edge should be at -67 dBm with 20 percent overlap.
09-01-2015 05:10 PM
which site survey tool you use ?
09-01-2015 10:10 PM
Ekahau or AirMagnet, not decided yet.
09-01-2015 11:44 PM
If you use Ekahau, I would check the 2nd strongest signal and see the given area is covered close to -67dBm.
I do not think you can accurately measure % of overlapping in practice.
HTH
Rasika
09-02-2015 01:02 AM
Thanks Rasika!
10-06-2015 02:44 PM
09-20-2015 07:00 AM
10, 15 or 20% or cell areas is not easy to calculate (although there is an equation for that; if you want your overlap to be 10%, walk to the point where the AP signal is at what you want for your cell edge, i.e. the point where you want your client to be able to discover the next AP, measure the distance to the first AP; the next AP should be about 1.6 times this distance,; for 15% overlap, next AP is at 1.5 the first AP cell useful radius, 20%, next AP is at 1.4 times the cell radius, etc.). This paper explains how this is calculated:
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