| Jung-Shyr
Wu, NCU Peir-Yuan Wang , NCU
and Chunghwa Telecom Co.,Ltd.
This paper
presents the performance modeling, analysis, and simulation of SIP-T
(Session Initiation Protocol for Telephones) signaling system in
carrier class VoIP (Voice over IP) network. The SIP-T signaling system
defined in IETF (Internet Engineering Task Force) draft is a mechanism
that uses SIP (Session Initiation Protocol) to facilitate the
interconnection of PSTN with carrier class VoIP network. Based on IETF,
the SIP-T signaling system not only promises scalability, flexibility,
and interoperability with PSTN but also provides call control function
of MGC (Media Gateway Controller) to set up, tear down, and manage VoIP
calls in carrier class VoIP network. In this paper, we analyze the
queueing size (i.e. buffer size), the mean of queueing delay, and the
variance of queueing delay of SIP-T signaling system that are the major
performance evaluation parameters for improving QoS (Quality of
Service) and system performance of MGC in carrier class VoIP network
focused on toll by-pass or tandem by-pass of PSTN. First, we assume a
mathematical model of the M/G/1 queue with non-preemptive priority
assignment to represent SIP-T signaling system. Second, we present the
formulas of queueing size, queueing delay, and delay variation for the
non-preemptive priority queue by queueing theory respectively. Besides,
some numerical examples of queueing size, queueing delay, and delay
variation are presented as well. Finally, the theoretical estimates are
shown to be in excellent consistence with simulation results.
Index Terms- SIP-T Signaling System, Carrier Class VoIP
Network, Media Gateway Controller, Quality of Service, Performance
Copyright
(c) 2003 Institute of Electrical and
Electronics Engineers, Inc. All rights reserved. | |
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