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RE: [ns] problem ...



For wireless networks, they have their own ARQ algorithms such as stop-and-wait
in mac 802.11 module. Since ns-2 now provides some number of mac layers for wireless
networks, you may need to look at them to find what kind of ARQ's are available now.

For FEC, ns-2 didn't suppport any FEC algorithm since it requires some kind of bit-level
simulation, namely the number of damaged bits and their locations. The latest ns version
adds the bit unit at the error models so that ns can indicate how many bits are corrupted
in each packet delivered over wireless channels. For FEC algorithms, I am working now
and if I finish, I plan to release soon. Or you may begin to start using the FEC template (fec.cc)
provided in the latest version even though I think it is not good enough for your experiment.

Good luck.
-jahn
     


-----Original Message-----
From: owner-ns-users@ISI.EDU [mailto:owner-ns-users@ISI.EDU]On Behalf
Of vijay reddy
Sent: Monday, June 18, 2001 3:03 PM
To: ns-users@isi.edu
Subject: [ns] problem ...


hi all,
          i am trying to implement a wired-wireless
          protocol using ns-2.i have to make changes
          at the link layer and hence have to
          implement ARQ and FEC.
          i figure that snoop.tcl is a good place to
          start
  	  ...(is that right ?)
	   can someone tell me if ARQ and FEC are
          implemented in ns ..
          also does snoop work well ..i have seen in
          the old archives thta it is broken ..
          
thanx a lot
..vijay

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