Specifications

AP Placement for Optimal Performance 25
The AP distance to avoid co-channel interference is described in Section , “Clear Channel Assess-
ment, CCA”, on page -23. The CCA will not introduce any transmission interrupts if the APs or
STAs are separated to -76 dBm. However, if two APs on the same channel are transmitting at the
same time, the handset will require the interfering signal to be attenuated at least 15 dB compared
to their “own” signal.
Different systems have different RF characteristics in terms of co-channel interference suppres-
sion, adjacent channel rejection and clear channel assessment. This might have some effect and
different systems behave differently with the same set-up.
It is important not only to think of coverage but also on people´s moving patterns, and place the
APs so it gives coverage around corners, along walking paths and through thick doors. For optimal
coverage around corners, it is recommended to place an AP in the crossroad, see
<Blue>Figure
6 below.
Figure 7.
Figure 6 Recommended placement of AP to receive coverage around corners.
In a building with thick walls APs may be needed to be placed inside the rooms for optimal cover-
age. Then a placement of an AP in the walking path outside these rooms is recommended to min-
imize the amount of roamings, see <Blue>Figure 7 below. Note that if too many APs are placed in
the corridor, the roaming problem is just moved to the corridor APs.