Download Performance of Communication Systems: A Model-Based Approach by Alexander Ost PDF

By Alexander Ost

This publication presents an intensive method of help the making plans and optimization procedure for contemporary conversation networks. in line with an research of the main homes of recent community architectures, a suite of necessities for such ways is derived. A model-based functionality overview strategy is advised, the place highly-efficient matrix-geometric equipment are hired with a purpose to avoid the drawbacks of latest numerical and simulative techniques. The e-book encompasses a thorough survey and a close comparability of cutting-edge numerical algorithms within the matrix-geometric box. A high-level modeling method in line with stochastic Petri nets is built with a purpose to simplify the specification of advanced versions. to demonstrate the technique, numerous case experiences are awarded, overlaying program parts from ATM networks to world-wide-web site visitors and TCP/IP networking.

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Concerning the analytical approaches, computation times are rarely an issue. However, care must be taken that the modeling formalism does not neglect too many of the system properties, and that it is possible to incorporate as much information as available (as long as this is sensible to the modeler). Clearly, many of the analytical approaches mentioned above do not match this requirement. The most flexible approaches in this area are those suggested in [82] and [199]. Interestingly, both approaches are based on MIGI1 node models, and especially the first one is very closely related to our prototype approach.

This table thus corresponds directly to the transpose of matrix R. Physical Network Properties. For our experiments, we assume that two physical network nodes are available for realizing virtual service devices. These nodes are interconnected via Ethernet. In accordance with IN terminology, we refer to these two nodes as SCP (service control point, focusing on IN service provision) and SSP (service switching point, concentrating on switching aspects). 4, the SCP thus realizes SCF functionality, and the SSP implements the SSF.

Service Structure. We assume that there is a total number of S services {l, ... ,S} available in the system (like, for example, the freephone service). Each service is realized by combining service building blocks from a set of M available building blocks, denoted by {l,··· ,M}. Each such block accesses a number of virtual service devices, possibly several times. Thus, we describe the number of invocations of a virtual service device by each building block by a matrix R E N~XK (so rows in this matrix correspond to building blocks, and columns refer to service devices).

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