Imad Abdeljaouad wrote: > Hi, > I know it's in 802.11 MAC, but where exactly. And how do I know which > packets are colliding and the "period of time" they collide? > Thanks! > Firstly, I recommend you ns manual. It is the document which you can find many fundamantal things inside.
the file is ns_dir/mac/mac-802_11.cc and you have to read it in detail to find the way CSMA/CA is simulated. There are also some comments in the code that will help you. Cheers, > On Wed, Nov 12, 2008 at 7:21 PM, Nguyen Lan <[EMAIL PROTECTED]> wrote: > > >> Imad Abdeljaouad wrote: >> >> >>> Hi Helber, >>> Thanks for the prompt response. Actually, I am looking for the code in ns2 >>> (source code) where we can detect collisions. I want to simulate >>> interference, so I need to get the packets that were received at the same >>> time on some node. I know interference happens on the physical layer, but >>> I >>> think it would be much more easier to implement it on the MAC in ns2. So I >>> am actually looking the source code part that says here is another packet >>> being transmitted while receiving another packet ( which is collision if >>> both packets are meant for the same receiver, and interference if both >>> packets belong to the same (or an adjacent) channel. >>> >>> >>> >> I think the implementation of 802.11 MAC is exactly the place you should >> look into. >> >> Cheers, >> Nguyen. >> >> Can you help with that ? >> >>> cheers, >>> >>> On Tue, Nov 11, 2008 at 8:35 PM, Helber Wagner <[EMAIL PROTECTED] >>> >>>> wrote: >>>> >>> >>> >>>> Hi, Imad. >>>> >>>> As far as I understood your question, you should analyze the trace file >>>> generated >>>> by your simulations. >>>> >>>> If the MAC trace is enabled in your .tcl file, it will be a row like "D >>>> ... COL ..." >>>> indicating the time, the node, the packet and other information about a >>>> collision >>>> that has been happened. >>>> >>>> Finally, a simple perl/awk script can retrieve this information from the >>>> trace file. >>>> >>>> You can find more about mac trace in NS2 over the Internet. >>>> >>>> Good luck. >>>> >>>> --- >>>> Helber Wagner da Silva >>>> Federal University of Cear��� - Brazil >>>> URL: www.great.ufc.br/~helberhws <http://www.great.ufc.br/%7Ehelberhws>< >>>> http://www.great.ufc.br/%7Ehelberhws> >>>> >>>> >>>> >>>> ------------------------------ >>>> *De:* Imad Abdeljaouad <[EMAIL PROTECTED]> >>>> *Para:* "ns-users@isi.edu" <ns-users@ISI.EDU> >>>> *Enviadas:* Ter���a-feira, 11 de Novembro de 2008 23:17:46 >>>> *Assunto:* [ns] collisions in 802.11 or interference >>>> >>>> >>>> Hello there, >>>> I am looking for the code where collisions in 802.11 occur so that I know >>>> which packet(s) collided and for how long they collided? this is a step >>>> in >>>> trying to implement interference! >>>> thank you! >>>> >>>> -- >>>> best regards, >>>> ________________________ >>>> Imad Abdeljaouad >>>> >>>> ------------------------------ >>>> Novos endere���os, o Yahoo! que voc��� conhece. Crie um email novo< >>>> http://br.rd.yahoo.com/mail/taglines/mail/*http://br.new.mail.yahoo.com/addresses>com >>>> a sua cara @ >>>> ymail.com ou @rocketmail.com. >>>> >>>> >>>> >>>> >>> >>> >>> >>> >> > > >
