Last updated on August 29th, 2020 at 01:28 am
Carrier Sense Multiple Access with Collision Avoidance (CSMA/CA):
This is a wireless network multiple access method defined by IEEE 802.11 standard. CSMA/CA is a modification to CSMA/CD. Collision detection as in CSMA/CD is not applicable for several reason, one reason is Hidden Terminal Problem.
- The sending station after sensing the station idle sends a special small frame called Request to Send (RTS) in which the station defines the total time it needs the medium.
- The receiver after receiving the RTS sends a small packet Clear to Send (CTS) to all the stations meaning that it has received the RTS and the medium is clear.
- Then the sender sends the data frame.
- The receiver acknowledges the receipt of data.