I am searching for this answer for quite some time now. Why there is CSMA/CD in LAN but CSMA/CA in WLAN?
The best explanation I could find is "due to extreme ratio in transmitting and receiving power, it is very impractical to transmit data on the same channel. Hence collision avoidance is used". Couldn't get the meaning. Even if you're using two separate channels for transmit and receive, CSMA is used to decide which node will use channel, so no point in dropping CD in place of CA. So this explanation somehow doesn't seem fit.
The only reason I could think of is that if number of nodes are low, hence chances of collision is low, we should use CD, if chances of collision are high, we should use CA. But there isn't a difference of number of users between LAN and WLAN.
If someone could please explain.