Here,
DIFS:
Distributed Inter-Frame Space
SIFS:
Short Inter-Frame Space
p { margin-bottom: 0.08in; }
802.11
CSMA (No Collision Detection):
Sender:
- If the channel is idle for DIFS seconds it transmit DATA packet.
- If the channel is busy then it Backs off
Receiver:
If
DATA packet received it sends back ACK after SIFS seconds.
Data
Transfer is as follows:
Here,
DIFS:
Distributed Inter-Frame Space
SIFS:
Short Inter-Frame Space
CSMA/CA
(Collision Avoidance) - RTS/CTS Implementation:
In
this CSMA/CA method a Sender transmits an RTS packet Receiver
responds with a CTS packet. RTS stands for ‘Request To Send’ and
CTS stands for ‘Clear To Send’.
Purpose
of CTS packet:
1.
It reserves channel for sender.
2.
Notify other stations.
Data
Transfer takes place is as follows:
