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Title of Journal: Wireless Pers Commun

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Abbravation: Wireless Personal Communications

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Springer US

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10.1002/jctb.4048

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1572-834X

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Performance Analysis of Dedicated Signalling Chann

Authors: Salvador LunaRamírez Matías Toril Volker Wille
Publish Date: 2010/02/24
Volume: 60, Issue: 2, Pages: 215-235
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Abstract

GERAN GSMEDGE Radio Access Network operators have traditionally used the Erlang B formula to estimate the number of signalling channels on a percell basis Thus it is assumed that the network behaves as a loss system with Poisson arrivals However the presence of automatic retrial mechanisms and correlated arrivals in these channels suggests that these assumptions might not be valid This paper presents a performance analysis of the Standalone Dedicated Control CHannel in GERAN Preliminary analysis shows that the Erlang B formula underestimates congestion and blocking on this channel To address this issue a queueing model with retrials and correlated arrivals is proposed where correlation between arrivals is modelled by a simple MarkovModulated Poisson Process The proposed model can be tuned on a percell basis by statistics in the Network Management System Model assessment is based on performance statistics from a live GERAN system Results show that a simple retrial queueing model fails to explain blocking in cells with a large number of channels These limitations are overcome by adding correlated arrivals in the retrial model

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