MATH
COLLOQUIUM,
SPEAKER: Dr. Enoch Lee, Assistant
Professor
Department of Mathematics,
TITLE: Voice over IP (VoIP)
over wireless
Abstract:
Intelligent
mobile terminals (or users) of next generation wireless networks are expected
to initiate voice over IP (VoIP) calls using session
set-up protocols like H.323 or SIP (session initiation protocol). To guarantee the service quality of such
applications, the call set-up protocol should be robust against network
impairments. In this presentation, we
analyze the performance of the H.323 call set-up procedure over wireless links
using a simple call model under two modes of operations, namely, Regular and
Fast Connect. The proposed model assumes
the presence of radio link protocol (RLP) and recommends that the VoIP packets be transferred without RLP retransmissions,
while H.323 control packets be transferred with RLP retransmissions.
The analytical models and details experiments show that the VoIP
call set-up performance
can undergo significant degradation if RLP is not used at all,
even for moderately high frame error rates (FERs) in
wireless links. On the other hand, a
robust radio link layer, such as RLP, can improve the call set-up delay
performance as compared to the existing wireless voice call-set-up delay.
REFRESHMENTS:
http://www.ferris.edu/htmls/colleges/artsands/Math/MATH_COLLOQUIUM/ColloquiumWeb/index.html