Wireless Ad Hoc and Sensor Networks

192 Wireless Ad Hoc and Sensor Networks454035SSCDOptimalBambosCSOPCPlot of outage probability vs. number of usersOutage probability30252015BambosCSOPCOptimalSSCD10502040 60 80 100 120 140 160 180Number of usersFIGURE 5.5Outage probability with number of users.with a varying number of nodes to evaluate the performance of DPCschemes. The plots of outage probability in Figure 5.5 and total power inFigure 5.6 demonstrate that the outage probability and total power consumed,using the SSCD and optimal DPC schemes, respectively, continueto be lower than when compared to Bambos and CSOPC schemes. Whenthe number of users varies, the lower outage probability observed inFigure 5.3 is the result of low power consumption by our DPC schemesin comparison with others while the time to reach the target is longer thanothers, as seen in Figure 5.4. This is the trade-off.Example 5.2.2: Transmitter Power Control of CellularNetworks with Mobile UsersTo illustrate the performance of the DPC in cellular networks with mobileusers, consider the scenario from Example 5.2.1. The requirements of thetarget SIR and design parameters were selected from Example 5.2.1.Mobility in the cellular environment has been simulated as follows: Auser can move a maximum of 0.01 km per time unit in any one of theeight predefined directions chosen at random at the beginning of the