Abstract
This paper presents a methodology for the modelling and optimization of multi-service radio access for universal mobile telecommunications system (UMTS) networks. The paper provides a description of the basis for modelling of a tandem pair: a wideband code division multiple access (WCDMA) interface and a Iub interface. The models involved in the study take into consideration a possibility of setting priorities to a number of selected traffic classes. Particular attention is given to the development of simple computational algorithms that would make it possible to determine the blocking probability for call streams with different priorities. The results of the analytical calculations are then compared with the results of simulation experiments, which confirms the high accuracy of the proposed analytical solutions.
Highlights
Modern mobile networks service mixtures of different traffic streams with different quality requirements
Among different types of the non-full-availability group, particular attention should be given to Erlang’s ideal grading, the structure of which and the first single-service analytical model was presented by Erlang [30]
Let us consider the sequence of calculations in a telecommunication system composed of the wideband code division multiple access (WCDMA) interface and the Iub interface in tandem, assuming that in each interface, a mechanism has been introduced for the prioritization of M classes of calls
Summary
Modern mobile networks service mixtures of different traffic streams with different quality requirements. Among different types of the non-full-availability group, particular attention should be given to Erlang’s ideal grading, the structure of which and the first single-service analytical model was presented by Erlang [30]. It is adopted in this paper that a packet stream of a given call of class i that is offered to the Iub interface will be represented by a constant bit rate [ci]Ma (that corresponds to the equivalent bandwidth) Such an approach makes it possible to perform the so-called discretization of the system [38, 39], i.e., the expression of the capacity of the system, as well as the demands of individual traffic classes, in the same units, called allocation units (AU). Where [λi]M is the intensity of a Poisson call stream of class i (1 ≤ i ≤ M) and [μi]M is the average service intensity for call of class i
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