Fluid-flow modelling of internet traffic in GSM/GPRS networks
Authors: Irnich, Tim and Stuckmann, Peter
Department of Communication Networks (ComNets), Faculty 6, RWTH Aachen University
: Tim Irnich
In Computer Communications Journal, Vol. 26, p.p. 1756-1763,Elsevier Science, 2003.
Publication Date: , 2003
On page(s):1756-1763
ISBN:
Abstract
In order to find an analytical solution for performance evaluation
of Internet access over the General Packet Radio Service
(GPRS), the packet-switched extension of the GSM mobile radio
network, we evaluate the well-known Fluid-flow modelling (FFM)
approach. Mobile Internet users are modelled by an ON/OFF source
with exponentially distributed sojourn times in the ON and OFF
state.
We choose the IP datagram delay at the radio interface as quantity
of interest. As Fluid-flow analysis only delivers the mean
equilibrium buffer content, we present some additional methodology
to calculate the sojourn time in the Fluid-flow model, taking
specific characteristics of the GPRS into account. ON/OFF source
parameters are determined representing the mean offered traffic in
typical GPRS load scenarios by stochastic simulation, using the GPRS
emulation system GPRSim. The GPRSim comprises load generators
representing typical GPRS usage and a prototypical implementation of
the GPRS protocols.
Comparison of simulation results and analysis is performed using the
same traffic source model for both simulation and analysis,
eliminating approximation of WWW traffic characteristics as a reason
for deviations between simulation results and analysis.
Additionally analytical results are compared with results of the
GPRSim using a detailed WWW model for traffic generation. The
results illustrate the influence of accurate source modelling and
the limitations of the FFM to model the GPRS system with elastic
traffic. It is shown that the FFM is not able to depict the elastic
property of TCP-based Internet traffic, but is capable of modelling
the multiplexing of inelastic traffic like generated by streaming or
real-time applications over the GPRS radio link in sufficient
detail for performance estimations.
Author Keywords
Download Bibtex
@ARTICLE{Irnich_Stuckmann_CCJ_2003,
AUTHOR = {Irnich, T. and Stuckmann, P.},
TITLE = {Fluid-flow modelling of internet traffic in GSM/GPRS networks},
JOURNAL = {Computer Communications Journal},
YEAR = {2003},
VOLUME = {26},
PAGES = {1756-1763},
PUBLISHER = {Elsevier Science},
AFFILIATION = {Department of Communication Networks (ComNets), Faculty 6, RWTH Aachen University},
URL = {https://www.comnets.rwth-aachen.de}
}