![]() ![]() For instance, it can create a new event that says 'A message from Node A has been delivered to Node B by channel C at time 6', thus creating a simulation in which it takes messages 1 simulation time units to propagate across the channel (from time 5 to time 6 in my example). When informed of the event, channel C can, in turn, create events in response. The events are placed into a time-sorted queue, and the timing loop de-queues the events one at a time.Whenever an event is de-queued, it's handled by notifying all relevant entities of the event.įor instance, if the de-queued event is 'Node A sent a packet to Node B through channel C at time 5', the event is handled by informing channel C of the sent packet. In such a simulation each simulation element (a node, a message,the shared channel etc) generates timed events (say 'i need to send a packet at time XXX', or 'a message has arrived at time XXX'). Time doesn't advance contentiously, but from one even to the next. In this model, to create a good approximation of actual time, the time increments have to be pretty small.2.Īn event driven simulationIn an event driven simulation things happen because it's time for them to happen. For instance, a node might decide to send a packet at simulation times A, B and C.After completing each iteration, the timing loop advances the simulation time by a fixed small amount and starts over. Nodes, channels, etc), asking each one whether it currently wants to do something.The simulation components make their decisions based on the current simulation time (passed by the timing loop), and their predefined behavior. The timing loop increments the simulation clock and iterates over each of the components of the simulation (e.g. The way in which time advances determines the way in which the simulation operates:1.Ī time-driven simulationIn a time driven simulation, time runs continuously and is incremented by small, discrete values in a timing loop. The difference between the two being the way in which the simulation time (or simulation clock) advances. #Download pure aloha program in c how to#How to simulate aloha protocol using a programming language? But, if I split the time into intervals won't this be a slotted aloha and not a pure aloha? – jonathan Nov 28 '11 at.Īssuming you want to create a single threaded simulation, you have two choices - a time driven simulation, or an event driven one. ![]() ![]() #Download pure aloha program in c simulator#I'm new to networking in general and I read about this protocol called Aloha, and I would like to make a simple simulator for the Pure version of it. ![]()
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