Thomas Kunz
Systems and Computer Engineering
374
TCP and Mobile Computing
–TCP is (most?) popular transport layer
protocol
–designed for wired networks
nlow error
rate
nrequirement to
share bottlenecks
–key assumptions in TCP are:
npacket loss is
indication of congestion, not transmission error
nrather aggressive
response to congestion is needed to ensure fairness and efficiency
–wireless links and mobile computing violate
these assumptions:
npackets lost due
to unreliable physical media
npackets can get
lost due to handover