Hi, In the DCF media access, the node must sense the wireless channel to be idle for a DIFS period before it can attempt to transmit. If the medium is determined to be busy (either NAV or physical carrier sense) the terminal waits until the end of the current transmission before initiating a backoff procedure. THIS IS CALLED DEFERAL. After sensing the channel available at least DIFS period, then the station randomly selects a backoff counter and goes into BACKOFF stage.
On 2/27/06, Mohamed Youssef <[EMAIL PROTECTED]> wrote: > > > > Hello, > > > > I am trying to modify the code of the MAC layer in ns-2. I am getting > confused about the difference between "DeferTimer" and "BackoffTimer". I > have the impression that ns-2 is backing off twice before sending a packet. > Anyone can help?? > > > > > > Mohamed Youssef > > Université de Sherbrooke > > > > > -- > No virus found in this outgoing message. > Checked by AVG Free Edition. > Version: 7.1.375 / Virus Database: 268.1.0/269 - Release Date: 2/24/2006 > > > > -- > No virus found in this outgoing message. > Checked by AVG Free Edition. > Version: 7.1.375 / Virus Database: 268.1.0/269 - Release Date: 2/24/2006 > >
