In CSMA/CD the sender senses the medium(eg wire) if the medium is free it starts sending the data if in between any other sender sends data at same time collision occurs and this collision can be detected by all the devices in that network hence the sending device stops sending the data and waits untill the medium becomes free.
This works well for wired network but in case of wireless network this fails since the collision occurs at receiver side and this collision can't be detected by sender and sender feels that the sent packets are received by sender without collision and continues sending. In this case we use CSMA/CA.
For more details refer Mobile communication by Joehen schiller .
This works well for wired network but in case of wireless network this fails since the collision occurs at receiver side and this collision can't be detected by sender and sender feels that the sent packets are received by sender without collision and continues sending. In this case we use CSMA/CA.
For more details refer Mobile communication by Joehen schiller .
