DOWNLOAD MY Ph.D Thesis - UNAM

Chapter 4SIMULATION AND ANALYTICALMODELLING OF DVB/DAVIC4.1 IntroductionAs reviewed earlier in Section 1.2.3.2, the DVB/DAVIC protocol requiresapproximations of both the exponential backoff algorithm and the splitting treealgorithm, which cannot be accurately modelled using existing analytical models due tothe variable bandwidth assigned to the contention and reservation access regions from(MCI) cycle to cycle. Therefore, the high degree of complexity and the need foraccurate results indicate the use of simulation techniques for the performance evaluationand optimisation of the DVB/DAVIC protocol. The use of a simulation model willallow us to examine a wide range of configurations needed for drawing generalconclusions, and to test new enhanced mechanisms that would increase the performanceof the DVB/DAVIC protocol in a relatively short amount of time.In this context, the aim of this chapter is to present both the simulation model developedfor the DVB/DAVIC protocol and the analytical model formulated for the validation ofthe simulation results.4.2 Simulation modelling toolsAccording to [70] there are three main simulation languages oriented to the modellingof communications networks. The first language is the Block Oriented NetworksSimulator (BONeS) DESIGNER, which is a graphically-oriented, general-purposesimulation language that contains many features for modelling communicationsnetworks.4-1