DOWNLOAD MY Ph.D Thesis - UNAM

Chapter 4Simulation and analytical modelling pThe finite state machine of the IU Manager process is depicted in Figure 4.10. Theoperation of this state machine is as follows. Upon simulation start the state variablesare initialised. The MAC Initialisation procedure makes sure that an NIU cansynchronise with the INA and that it can receive the basic network parameters. When allNIUs have established a connection with the INA, an initial frame containing signallinginformation is sent to the cable network.Figure 4.10 – INA Manager process – FSM.The state machine then switches from the idle state to one of the five other possiblestates (that were considered for this study), representing the following events: 1) datapacket arrival from the upstream channel, 2) resource request message arrival from theupstream channel, 3) reservation request message arrival from the upstream channel, 4)MCI timer expired, and, 5) data packet arrival from the traffic generator. For each ofthese events, the appropriate MAC message or data packet is created and passed to theIA TX Controller process for further transmission on the downstream channel.4-13