The power level of a packet in NS is determined by the Pt_ variable which is amember of Phy/WirelessPhy defined in mac/wireless-phy.h. The power level can bechanged to x Watts for all nodes globally in tcl through the command,"Phy/WirelessPhy set Pt_ xW".
To set the power level of different nodes to different values one has to access the WirelessPhy class from a node's array of interfaces (netif_) and then set the corresponding Pt_ to the desired value.
For example, the following command sets the power level of node node_(0) to 0.5 W.
[[lindex [$node_(0) array get netif_] 1] set Pt_ 0.5]
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