JOURNAL OF COMMUNICATIONS (JCM)
ISSN : 1796-2021
Volume : 2    Issue : 1    Date : January 2007

On the Tradeoff Between Blocking and Dropping Probabilities in Multi-cell CDMA Networks
Gábor Fodor and Miklós Telek
Page(s): 22-33
Full Text:
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Abstract
This paper is a sequel of previous work, in which we proposed a model and computational
technique to calculate the Erlang capacity of a single CDMA cell that supports elastic services. The
present paper extends that base model by taking into account two important aspects of CDMA. First,
we describe a simple and a refined multicell CDMA model that are able to capture the impact of the
neighbor cells on important performance measures of the cell under study. These performance
measures include the class-wise blocking probabilities and the mean time that elastic sessions
spend in the system. Secondly, we model the impact of the outage by taking into account that in
progress sessions can be dropped with a probability that depends on the current load in the serving
and neighbor cells. We then consider a system with elastic and rigid service classes and analyze
the trade-off between the total (soft and hard) blocking probabilities on the one hand and the
throughput and the session drop probabilities on the other.

Index Terms
code division multiple access (CDMA), traffic capacity, queueing theory, Markov chains