Size-based Differentiation to Enhance System and User
Perceived Performance for Networks Supporting Best
Effort Traffic
Mr. S. Jay Yang
Dept. of Electrical and Computer Engineering
The University of Texas at Austin
Friday, September 28th, 1:30 PM, ACES 3.408
scyang@ece.utexas.edu
Abstract
A fundamental, yet usually ignored, challenge to evolving
data networks is enabling better Quality of Service (QoS)
for best effort traffic. While over-provisioning network
resources was considered to be a simple, possibly less
expensive solution, the lack of fairly predictable
Internet traffic and growth model makes it almost
impossible to ensure an "efficiently" dimensioned network.
Even if a single carrier could overcome this problem and
appropriately provision his network, the heterogeneity
of the inter-networking infrastructure would make
coordinating inter-carrier agreements to avoid mismatches
exceedingly difficult. Recognizing that over-provisioning
is at most a partial solution, we approach the problem by
"intelligently" share resources that extends the "dynamic
range" of traffic loads where networks can ensure adequate
system and user perceived performance.
Best effort service involves for the most part transfers
of files for which the transmitter has a-priori knowledge
of the file's size. Two plausible QoS measures for such
transfers are delay and bit transmission delay (BTD),
i.e., delay/file size, among which the latter captures
more "savvy" users who recognize that big files take
longer to transfer. In this talk I will discuss how one
might design size-based transport mechanisms and routing
algorithms to enhance the overall network and user
performance in a cooperative environment. Our view is
that by simply introducing such size information, one
may produce a "robust" best effort network that achieves
better performance for all transfers for a range of
traffic loads, even with the existence of impatient users.
Biography
Shanchieh Jay Yang received his B.S. degree in Electronics
Engineering at the National Chiao-Tung University (Taiwan)
in 1995. After working as a research assistant for Professor
C. Bernard Shung in Taiwan, he then entered the Department
of Electrical and Computer Engineering at the University of
Texas at Austin, and received his M.S. degree in 1998. He
is a recipient of 1999 TxTEC Graduate Fellowship. He is
currently working on his PhD research with Dr. Gustavo de
Veciana. His research interest focuses on dynamic resource
allocation on next generation multi-service data networks.
A list of Telecommunications and Signal Processing Seminars is available at
from the ECE department Web pages under "Seminars".
The Web address for the Telecommunications and Signal Processing Seminars is
http://signal.ece.utexas.edu/seminars