Wireless Ad Hoc and Sensor Networks

Congestion Control in ATM Networks and the Internet 107TABLE 3.1Comparison of ResultsExample 4 NN ThresholdCell loss ratio 0 1.172%System power 7.475 7.0917The results are presented in Table 3.1. The transmission time for individualtraffic sources are shown in Table 3.2. From Table 3.1 and Table3.2, we can say that the threshold scheme cannot guarantee fair share toall the users and our proposed NN scheme can achieve fair share for theusers by adjusting the elastic traffic rates (because these traffic rates cantolerate wide-range changes in delay and throughput) while assuring theQoS for the inelastic traffic. The metric power is defined as:average throughputPower = (3.35)transmission delayExample 3.3.5: Extended Topology with Multiple BottlenecksWe use the same traffic sources: 3 VBR traffic sources and 3 CBR trafficsources introduced in Example 3.4. Source rates are adjusted using thefeedback uk ( ) separately. The buffer size is taken at 50 cells at each switch.For results in Figure 3.11, congestion was created by reducing the bandwidthof different links of the topology in Figure 3.19, as follows, at thespecified time interval and, held at that rate, till the completion of thetotal transmission:Bandwidth of Link0 = 23,584 cells/sec->5896 cells/sec, t =3 sec;Bandwidth of Link1 = 23,584 cells/sec->7862 cells/sec, t = 6 sec; (3.36)Bandwidth of Link2 = 23,584 cells/sec->11,793 cells/sec, t =24 sec;TABLE 3.2Transmission Times for Sources to Ensure FairnessSource NN (sec) Threshold (sec)Data1 31.58 30.05Data2 31.85 30.05VBR 30.07 30.05CBR1 30.04 31.95CBR2 30.05 30.04CBR3 30.04 30.04