Installation guide

TD 92408EN
9 December 2011 / Ver. G
System Planning
Ascom VoWiFi System
24
transmissions. Therefore if they transmit at the same time, collision is likely to occur at the
AP which will not be able to receive an error free frame from any of the two STAs.
Figure 7.
Figure 5. 2 STAs and an AP showing simultaneous transmission and collision
The hidden node problem is accentuated when adjacent cells use the same channel. One
common
solution to this problem is to use Request-To-Send/Clear-To-Send (RTS/CTS).
However, the use of RTS/CTS introduces overhead for all clients in the cell and is not
recommended.