Energy Model
n Assumption: only wireless interface consumes energy (i.e.,
internal processing of messages etc. is “free”)
n NS2 has (simplistic) energy model: “The energy model in
a node has a initial value which is the level of energy the
node has at the beginning of the simulation. This is known
as initialEnergy. It also has a given energy usage for every
packet it transmits and receives. These are called txPower
and rxPower”
n Default IDLE energy consumption is zero, send/receive
costs independent of packet size, unicast/broadcast, etc.