Izvorni znanstveni članak
https://doi.org/10.2498/cit.1001384
The Uplink Capacity Evaluation of Wireless Networks: Spectral Analysis Approach
Kobbane Abdellatif
Elazouzi Rachid
Ibrahimi Khalil
Bouyakhf El-Houssine
Sujit Kumar Samanta
Sažetak
In this paper we study the capacity of wireless cellular network, in
particular the uplink of WCDMA system by using the two dimensional continuous-time Markov chain (CTMC) technique. Considering two types of calls: real-time (RT) calls that characterized by a quasi
fixed transmission rate, and best-effort (BE) calls which do not
require strict demand but need some reliability conditions. We
develop an approach based on the spectral analysis for evaluating
the cell capacity. We explicitly obtain the simultaneous
distribution of the number of RT connections and the number of BE
connections in the steady-state. This analysis allows us to simplify
the computation of the performance measures including expected delay
and throughput of BE traffic. These performances are obtained
explicitly in both cases (finite and infinite) of BE calls as
function of system parameters like arrival rate of BE and RT calls,
service rate of BE and RT calls. These results allow the operator to
evaluate the cell capacity by varying these parameters independently
of the number of BE calls according to its policy to manage the
network. Note that this analysis can be applied to various systems
such as WiMAX/HSPA, and for both uplink and downlink scenarios, so
our spectral analysis approach is not only applicable to the uplink
of WCDMA system. We further propose some CAC (Call admission
control) policies for BE traffic. We finally conclude this work by
some numerical and simulation results. The simulation results
obtained by the network simulator (NS2) are closely to the numerical
results of our analytical results which validate our theoretical
model.
Ključne riječi
Hrčak ID:
59510
URI
Datum izdavanja:
30.3.2010.
Posjeta: 1.541 *