When performing an RF site survey for a WLAN system deployment that will include VoWiFi handsets,
what special technique should be considered?

A.
AP output power should be maximized for maximum coverage

B.
The number of directional antennas should be maximized to reduce the noise floor and co-channel interference.

C.
All cell edges should be at least 15 dB above the noise floor

D.
AP antennas should be down-tilted between 5 and 15 degrees

E.
AP spacing should yield at least 50% cell overlap