The different currents available in the Sensor Battery model are (i) Transmit-Current (ii) Receive-Current (iii) IdleMode-Current, and (iv) SleepMode-Current


The energy consumed in each of these activities would is computed as:

  • Transmit-Energy-Consumed = Transmit-Current * Voltage * Time-for-which-node-transmits-packets
  • Receive-Energy-Consumed = Receive-Current  * Voltage * Time -for-which-node-receives-packets
  • IdleMode-Energy-Consumed = IdleMode-Current  * Voltage * Time-in-Idle-Mode
  • SleepMode-Energy-Consumed = SleepMode-Current  * Voltage * Time-in-sleep-mode


Total-Energy-Consumed = Transmit-Energy-Consumed + Receiver-Energy-Consumed+IdleMode-Energy-Consumed + SleepMode-Energy-Consumed


Here Time-for-which-node-transmits-packets is calculated with the formula


Time-for-which-node-transmits-packets = PHY_OUT - CARRIER_SENSE_END 

of each packet. The PHY_OUR and CARRIER_SENSE_END timestamps can be got from then Event Trace. (Note that the Event trace feature is not available in the Academic version of NetSim. It is only available with the standard version.)


Energy harvesting


NetSim also has an Energy-Harvesting Model and 


Energy-Harvested = Recharging-Current * Voltage * Time

 

Hence, 


Battery-Energy (at any time) = Initial-Energy - Total-Energy-Consumed + Energy-Harvested


The units in NetSim for current is mA, for Voltage is V and for Total-Energy-Consumed is mJ.  The Unit for Initial-Energy is mAH and this is converted to mJ for calculations since the output metrics are in mJ. The Initial energy in mAH is converted to mJ using the formula:


Initial Energy (mJ)= Initial Energy (mAH) * Voltage (V) * 3600


For example, if we set Initial energy=0.5mAH, and if the voltage in 1V then Initial Energy (mJ) = 1800 (i.e. =0.5*3600)


The default settings in the energy model in NetSim IoT/ WSN library is based on Table 1 in the following paper:

Accurate Prediction of Power Consumption in Sensor Networks

Related articles:


where-is-energy-consumption-battery-model-in-netsim-wsn-iot-set-calculated-

how-to-get-energy-harvesting-metrics-in-the-results-window-


Webpage


NetSim IoT: https://tetcos.com/iot-wsn.html

NetSim Documentation: https://tetcos.com/netsim-documentation.html