Utilizing 1,4,6,9,11 vs only 1,6,11 ; which better?

Hi experts,
We must deploy upto 8 ssid in the same area due to commercial reason. With only one big infrastructure wlc8500+500ap.
With 8 ssid simutanously, should separate into TWO group of 4+4 (AP group)?
Due to 4-5 ssid/ap limitation (too much beacon if a ap broadcast more that 4-5 ssid)
If so, is it better to let 1st group to use 1,6,11 and 2nd group for 4,9 (forcing by RF profile)
vs
1st & 2nd group for only 1,6,11
In term of interference, duty cylce etc. Which on is better?
Thank you & Br
Nipat CCIE#29422

Hi salma,
I got a clue (testing) classical rule of thump of minimisation of SSID# concept.
http://www.revolutionwifi.net/2010/10/limit-ssids-data-rates-to-maintain.html
Here is an example. Assuming 6 SSIDs per-AP, 100ms TBTT, and 3 co-channel APs in the same area (within signal range to induce CCA medium busy backoff amongst each other):
Note 2013-08-16: This assumes a 180 byte beacon frame, which is probably too low for modern WLANs which have added many features that result in more Information Elements. For example, I typically measure beacons at around 370-400 bytes today. 802.11u and Hotspot 2.0 capabilities will increase this further. So, these calculations on bandwidth utilization are probably about half of what they are today. Double these numbers :) I'll try to post another blog updating these numbers accordingly.
   Beacon Data Rate Resulting Channel Bandwidth Utilization
   1 Mbps 25.92%
   2 Mbps 12.96%
   5.5 Mbps 4.71%
   11 Mbps 2.36%
   6 Mbps (802.11a/g) 4.32%
   12 Mbps (802.11a/g) 2.16%
Same network example, now with only 3 SSIDs per-AP:
   Beacon Data Rate Resulting Channel Bandwidth Utilization
   1 Mbps 12.96%
   2 Mbps 6.48%
   5.5 Mbps 2.36%
   11 Mbps 1.18%
   6 Mbps (802.11a/g) 2.16%
   12 Mbps (802.11a/g) 1.08%
That's fine to let WLC calculate their channel DCA, I'm totally agree!!!
Then, should I go whether all AP with 8-SSID broadcast OR 2 AP group (4 SSID each)?
Thanks

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Utilizing 1,4,6,9,11 vs only 1,6,11 ; which better?

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