sriram balakrishnan wrote: > ---------- Forwarded message ---------- > From: sriram balakrishnan <[EMAIL PROTECTED]> > Date: Tue, 30 Sep 2008 17:44:04 +0530 > Subject: range of mobile nodes > To: ns-users@isi.edu > > hi > > i would like to know where is the range of the node/mobile node set, for > example if i want that i should set the range of my node as 200 meters and > anything beyond that is to be sent in multi hops. > > You have to play with Carrier Sensing Threshold and Receiver Threshold as follows. Phy/WirelessPhy set CSThresh_ <value_1> ;#Foe carrier sensing range Phy/WirelessPhy set RXThresh_ <value_2> ;# For Receiver Threshold
whehre, the value_1/value_2 is the received power level below which the packet will not be sensed/understood respectively. To know which value to use for a particular distance use the <ns2dir>/indep-utils/propagation/threshold.cc utility. Just compile it and run it to know its usage. It takes "distance (mtrs)" as input and gives "ThresholdPower" as the output, which you can use for above values... By the way, the default values are set in <ns2dir>/tcl/lib/ns-defaults.tcl such that the cs range and rx range are 550 mtrs and 250 mtrs resp. regards, Mayur
