Hello, Thanks for you reply but my question is : > > 1) How we know the value of "bandwidth_" is "Phy/WirelessPhy > set bandwidth_", I though that I should find something like > "Mac 802.11 set bandwidth_" in "ns-default.tcl"
and > > 2)How should I choose the value of "basicRate_", if I would > like to set it my self? I mean what are usually the values that we choose. Best regards. Behnaz > ----- Original Message ----- > Expéditeur: Saravanan Kandasamy <svana...@gmail.com> > à: "ns-users@ISI.EDU" <ns-users@ISI.EDU> > Sujet: Re: [ns] Default Channel bandwidth in 802.11? > Date: Sun, 2 Dec 2012 13:28:46 +0000 > > > Dear Behnaz, > > > > Looks like you don't quite understand how MAC 802.11 > > works. > > > > "Phy/WirelessPhy set bandwidth_ 2e6" will only be used if > > you have not set basicRate_ or dataRate_ in your MAC > > setup. > > > > Even so the transmission time does not do "packet > > size/channel bandwidth", suggest you to study how > > Mac802_11::txtime(double psz, double drt) function works > > in mac-802.11.cc > > > > Good Luck. > > > > rgds > > Saravanan K > > > > On Sun, Dec 2, 2012 at 1:02 PM, Behnaz Bostanipour > > <behnaz.bostanip...@unil.ch> wrote: > > > > > > Hello, > > > > > > I would like to calculate transmission time (tx_time) > > for packets sent by CMU MAC 802.11. > > > > Usually we have tx_time=packet size/channel bandwidth. > > > > > > I looked in the "ns-default.tcl" file and I have found > > this value: > > > > Phy/WirelessPhy set bandwidth_ 2e6 > > > > > > Is this the value used for calculation of tx_time by > > 802.11? > > > > Thanks, > > > Behnaz > > > > > > > >
