Thomas Kunz
Systems and Computer Engineering
173
802.11 MAC: CSMA/CA
nSending unicast packets
–station has
to wait for DIFS before sending data
–receivers
acknowledge at once (after waiting for SIFS) if the packet was received correctly (CRC)
–automatic
retransmission of data packets in case of transmission errors
t
SIFS
DIFS
data
ACK
waiting time
other
stations
receiver
sender
data
DIFS
contention