[Nets-seminars] Talk 4:00 Friday 4th December GS/302
Richard G. Clegg
richard at richardclegg.org
Fri Nov 27 13:54:39 GMT 2009
Wireless Network Performance Analysis by Fixed-point Approximations
Abstract:
With various types of wireless network becoming integral parts of the
network infrastructure, their performance analysis becomes important for
all aspects of network design and engineering. This talk revolves around
the fixed-point methods as a general framework for the performance analysis
of communication protocols over different types of wireless networks. Based
on formulations derived for wired networks in the literature, we expand
them to accommodate properties that are more frequently, though not
exclusively, met in wireless networks including error-prone, broadcast and
MAC-shared links, link asymmetry and transport protocol mechanisms such as
Transmission Control Protocol (TCP) proxies. We illustrate the application
of fixed-point approximations on different wireless scenarios. First, we
show the use of the method in the context of closed-loop TCP traffic over
bandwidth on demand satellite networks (e.g. DVB-RCS satellite networks).
Then, we apply the approach to address the problem of analytically
predicting the performance of flows such as TCP or TCP-friendly rate
controlled (TFRC) over wireless local area networks (WLAN) with IEEE 802.11
DCF scheduled links. In both cases, the analytical results are compared
against simulation results. We demonstrate the applicability of fixed-point
techniques to the study of interactions between protocols at different
layers of the protocol stack, giving pointers to related work in the
literature. Finally, the talk discusses the limitations of the method as
well as directions for future work.
--
Richard G. Clegg,
Dept of Elec. Eng.,
University College London
http://www.richardclegg.org/
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