# Integrated Evaluation of Reliability and Power Consumption of Wireless Sensor Networks
## 6 Experimental Evaluation
### Sensitivity Analysis
#### 6.3.2 Results  
We analysed the impact of each factor (e.g., _Routing Protocol_) and the interaction between two factors (e.g., _Routing Protocol and Packet Size_) on the WSN power consumption and reliability as shown Table 3. We obtained these values when we used Equations (4) and (5) in the results. In this table, the values are sorted in descending order, i.e., it begins with the factor or interaction with the greatest impact and ends with the lowest one. Power ConsumptionThe four factors that affected more the WSN power consumption were _Routing Protocol_ (RP), _Packet Size_ (PaS), _Initial Energy Level_ (IEL) and _Sending Regular Rate_ (SRR). _Routing Protocol_ (RP) has the greater impact among the four factors because it decides how the sensor nodes will communicate with the sink node. For example, the protocol DIRECT has a better power \begin{table}
\begin{tabular}{l l c c} \hline \hline  & \multicolumn{2}{c}{**Power Consumption**} & \multicolumn{2}{c}{**Reliability**} \\ \hline  & **Factor** & **Impact** & **Factor** & **Impact** \\ \hline
1 & RP & 2169.39844 & RP & 0.40058532 \\
2 & RP and PaS & \(-\)2021.21875 & PIS and RP & \(-\)0.36882255 \\
3 & RP and IEL & \(-\)199.20071 & PIS & 0.33705977 \\
4 & RP and SRR & \(-\)1970.54688 & RP and PaS & \(-\)0.27112969 \\
5 & PA and RP & \(-\)1886.37500 & RP and IEL & \(-\)0.27058203 \\
6 & PaS & 1873.03906 & RP and SRR & \(-\)0.26114040 \\
7 & PaS and IEL & \(-\)1843.82813 & PIS and PaS & \(-\)0.23936691 \\
8 & PaS and SRR & \(-\)1822.36719 & PIS and IEL & \(-\)0.23881926 \\
9 & IEL & 1814.61719 & PIS and SRR & \(-\)0.22937762 \\
10 & IEL and SRR & \(-\)1793.15625 & IRR and RP & \(-\)0.20832578 \\
11 & SRR & 1771.69531 & PA and RP & \(-\)0.19865220 \\
12 & PA and PaS & \(-\)1738.19531 & NN and RP & \(-\)0.19406566 \\
13 & PA and IEL & \(-\)1708.98438 & IRR and PIS & \(-\)0.17656301 \\
14 & PA and SRR & \(-\)1687.52344 & PA and PIS & \(-\)0.16688943 \\
15 & PA & 1603.35156 & PIS and NN & \(-\)0.16230288 \\
16 & PIS and RP & \(-\)1459.57813 & PaS & 0.14167405 \\
17 & PIS and PaS & \(-\)1311.39844 & PaS and IEL & \(-\)0.14112640 \\
18 & PIS and IEL & \(-\)1282.18750 & IEL & 0.14057874 \\
19 & PIS and SRR & \(-\)1260.72656 & PaS and SRR & \(-\)0.13168476 \\
20 & IRR and RP & \(-\)1241.35156 & IEL and SRR & \(-\)0.13113711 \\
21 & NN and RP & \(-\)1210.56250 & SRR & \(-\)0.12169547 \\
22 & PA and PIS & \(-\)1176.55469 & IRR and PaS & \(-\)0.07887015 \\
23 & IRR and PaS & \(-\)1093.17188 & IRR and IEL & \(-\)0.07832249 \\
24 & IRR and IEL & \(-\)1063.96094 & PA and PaS & \(-\)0.06919657 \\
25 & NN and PaS & \(-\)1062.38281 & IRR and SRR & \(-\)0.0688086 \\
26 & IRR and SRR & \(-\)1042.50000 & PA and IEL & \(-\)0.06864891 \\
27 & NN and IEL & \(-\)1033.17188 & NN and PaS & \(-\)0.06461003 \\
28 & NN and SRR & \(-\)1011.71094 & NN and IEL & \(-\)0.06406237 \\
29 & PA and IRR & \(-\)958.32813 & PA and SRR & \(-\)0.05920728 \\
30 & PA and NN & \(-\)927.53906 & NN and SRR & \(-\)0.05462074 \\
31 & PIS & 749.75781 & IRR & 0.01606624 \\
32 & IRR and PIS & \(-\)531.53125 & NN & \(-\)0.01245400 \\
33 & PIS and NN & \(-\)500.74219 & PA and NN & 0.00786746 \\
34 & IRR & 313.30469 & PA and IRR & \(-\)0.00639266 \\
35 & IRR and NN & \(-\)282.51563 & PA & \(-\)0.00328091 \\
36 & NN & 251.72656 & IRR and NN & \(-\)0.00180612 \\ \hline \hline \end{tabular}
\end{table} 
Table 3: Impact of factors on the power consumption and reliability of the WSN. consumption than protocol GOSSIPING because sensor nodes send data directly to the sink node. It is worth observing that sensor nodes closer to the sink node are more active than sensor nodes far from it. To understand the impact of _Packet Size_ (PaS) and _Sending Regular Rate_ (SRR), it is necessary to remember the use of the mentioned First Order Radio Model. It only considers the power consumption of sending and receiving packets; which is directly influenced by two factors: _Packet Size_ (PS) and the _Initial Radio Range_ (IRR).