Improving the performance of reliable transport protocols in mobilecomputing environments
Caceres, R.; Iftode, L.
Selected Areas in Communications, IEEE Journal on
Volume 13, Issue 5, Jun 1995 Page(s):850 - 857
Digital Object Identifier 10.1109/49.391749
Summary:We explore the performance of reliable data communication in
mobile computing environments. Motion across wireless cell boundaries
causes increased delays and packet losses while the network learns how
to route data to a host's new location. Reliable transport protocols
like TCP interpret these delays and losses as signs of network
congestion. They consequently throttle their transmissions, further
degrading performance. We quantify this degradation through measurements
of protocol behavior in a wireless networking testbed. We show how
current TCP implementations introduce unacceptably long pauses in
communication during cellular handoffs (800 ms and longer), and propose
an end-to-end fast retransmission scheme that can reduce these pauses to
levels more suitable for human interaction (200 ms). Our work makes
clear the need for reliable transport protocols to differentiate between
motion-related and congestion-related packet losses and suggests how to
adapt these protocols to perform better in mobile computing environments
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