Specifications

26 Infrastructure Dependant Features
Figure 8.
Figure 7 It is recommended to place an AP in the middle of the walking path to reduce roaming
between APs in separate rooms.
Infrastructure Dependant Features
Automatic RF Adaptations in WLAN Systems
Many WLAN infrastructures make use of an internal tool that is changing the AP channels and/or
transmit power level in a dynamic way. The intention of the tool is to compensate for changes in
the RF environments due to layout changes of furnishings and/or AP failure.
However, these dynamic changes make the RF environment inconsistent and are not recom-
mended when real-time applications like VoWiFi are deployed. The effects of dynamic RF adap-
tations when APs switch channels are dropped speech frames and, at worst, the call can be
dropped.
If the power level is changed, the link budgets may be asymmetrical with co-channel interference
as a result, which will make the WLAN system perform poorly. The handset monitors the output
power of the APs and will automatically adapt itself to match in best way possible.
Load Balancing
Some WLAN infrastructures have an “automatic load balancing” feature. The purpose is to dynam-
ically “move” stations between APs in order to avoid overload and to spread the load. The “move”
of stations is done by forcing them to connect to another AP than the current one.