Chapter 6 Wireless and Mobile Networks - Network and Systems Lab
Chapter 6 Wireless and Mobile Networks - Network and Systems Lab
Chapter 6 Wireless and Mobile Networks - Network and Systems Lab
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IEEE 802.11 MAC Protocol: CSMA/CA<br />
802.11 sender<br />
if sense channel idle for DIFS then<br />
transmit entire frame (no CD)<br />
if sense channel busy then<br />
1. start r<strong>and</strong>om backoff time<br />
2. timer counts down while channel idle<br />
3. transmit when timer expires<br />
4. if no ACK, increase r<strong>and</strong>om backoff<br />
interval, repeat 2.<br />
802.11 receiver<br />
- if frame received OK<br />
return ACK after SIFS (ACK needed due<br />
to hidden terminal, fading problems)<br />
DIFS<br />
sender<br />
data<br />
ACK<br />
receiver<br />
SIFS<br />
6: <strong>Wireless</strong> <strong>and</strong> <strong>Mobile</strong> <strong><strong>Network</strong>s</strong> 6-23
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