There's a lot we don't know about this scenario. What are the throughput capabilities of the clients? What kind of apps do they need to run in this space? Will each person run more than one device at a time - if so would you assume 250 users with two devices that need simultaneous access (500 devices max)? Are you keeping the existing AP's or replacing them with the 3702's? Without an active survey and just doing basic capacity planning I would estimate a requirement of 12 radios, meaning 6 dual-band AP's evenly spaced if the room is perfectly square. 60x60 is not a large space but we're planning for high density, not RF coverage. I would reduce power on your AP's to keep cell sizes smaller, increase the minimum data rate requirement for these AP's (something around 36Mpbs on both radios as a starting point). Put them in an AP Group on your WLC for ease of management. I would prefer the 3702i model simply because it's an indoor AP. Unless you need a directional antenna there seems to be no reason to do anything else. Be careful of those retractable walls - they will usually kill a wireless signal when extended so be sure to have enough AP's in each section assuming that all of the retractable walls are fully extended. Net result would be 4 spaces that need coverage, not one large space.
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