[ns] Suggestions in modifying 802.11 mac

[Zubair Ahmad]

You can check out the mac-timers.h and .cc files for code implemeting the backoff timer.But the handler function is in mac-802_11.cc file..the routine which is called when the backoff timer expires.Think you have to make some changes with resetting the timer and all..

Zubair


On Wed, 21 Sep 2005 Andy Quek wrote :
>
>Goodday everyone,
>  Finally, i have manged to get my simulation done.
>  What my simluation does is that i have setup 7 nodes, all 200 metres apart
>each and all connected wire wireless 802.11. Adhoc routing is DSR. There are
>2 tcp connections, tcp1 and tcp2. Source of tcp1 is at node 0, and tcpSink1
>is at node 4. Source of tcp2 is at node 5 and tcpSink2 is at node 6. 2 FTP
>sources are also created for each of the tcp connections respectively. The
>simulation time is set at 10. ftp1 will start at time 1 and end at time 10.
>ftp2 will start at time 5 and end at time 8. Simulation runs fine and i have
>got my trace files.
>  I plotted the throughput graphs with tracegraph (wonderful tool!) and my
>graph shows that when ftp2 starts to send at time 5, ftp1 will be "switched"
>off and when ftp2 has finished sending, ftp1 will resume and finish at time
>10. in other words, i have shown that 2 tcp connection cannot co-exist.
>  The next part of my experiment is to attempt to modify the mac of 802.11 to
>change the backoff time so as to allow both tcp connections to co-exist. Any
>suggestions on how to approach this?
>  Cheers, thanks everyone for all the help which made my simulation possible,
>Andy
>
>
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