The energy model in this section is as follows: For a transmitting node, the total energy consumption (Pont) is calculated as two parts: The transmission energy for signal transmission and the circuitry power as shown in Equation (2), where Pct is the circuitry power consumption of the transmitter. The signal transmission power consumption (Pt) (in dB) is calculated as the sum of path-loss (PL) and the receiver sensitivity shown in Equation (3). The power consumption in receive mode (Ponr) is mainly composed of receive circuitry power consumption (Pcr) as in Equation (4):