Throughput and Delay

The next graph shows the values of throughput, delay and the time of simulation. The threshold values vary from −1 (the support nodes activated all the time) until 100 (the support nodes activated when one of the supported nodes contains 100 or more packets). For every threshold value we have run five different simulations, since the results in each of them is different because the arrival rates of packets to users depends on a random value. The value that we show in the charts is the average of the five values. In all the simulations, we have limited the number of packets that enter the network and reach the server to 500.

There are many variations in the parameters between the thresholds -1 and 7, and then they mantain more stable themselves until the threshold is equal to 100. This is why the chart is divided in parts left and right. The throughput values are much smaller than those for delay and simulation time. This is why it is shown in a separate part.

Processed Packets

These graphs depict the number of packets processed by each node. The X-axis identifies the threshold values for which we have run the simulations of the system. The normal nodes have been named from n1 to n8, like when creating the intial model in the initial rule. The last two graphs show the processed packets by the support nodes.

The charts showing the packets processed by the support nodes are the most interesting. Support nodes 1 and 2 refer to nodes n9 and n10 respectively in the initial model. The first support node stops processing packets when the threshold value is 80. Nevertheless the second support node, which at the beginning processes more packets that the first support node, stops processing packets when the threshold value is 7.


The next figures show the activation and deactivation of the support nodes throughout time. There are only two possible values for these graphs: if the Y-axis value is equal to 1 means that the node is active, on the contrary the zero value means that the node is inactive.

We have used the next notation: "Ti-Sj":

  • Ti represents the threshold value in the current simulation.
  • S1 and S2 correspond to the support nodes n9 and n10 respectively.

We see how the activation of the node is carried out later in time as the threshold increases. This is because, as thresholds increase, the supported nodes spend more time in having as many packets as the threshold value. Support nodes are also deactivated earlier when the threshold is smaller.