Thomas Kunz
Systems and Computer Engineering
375
TCP and Mobile Computing
–packet
losses over wireless link often in bursts
nwill trigger slow start rather than fast
retransmit
–packet
loss no indication of congestion
nreduction of congestion window will reduce
throughput
ngetting back to previous window size may take long
–problem
caused by mismatch of wireless link properties with assumptions
underlying TCP design
–multiple
suggestions to improve TCP performance:
nlink-level retransmissions: improve reliability of
wireless link
nnetwork layer solutions: SNOOP
ntransport layer solutions: I-TCP (indirect TCP),
Mowgli
nsession layer solutions: establish end-to-end session
layer connection, manages two separate TCP connections