On Monday 20 March 2006 08:27, Ashraf Bourawy wrote: > in addition, in ns-2, the transmission range is set to approximately 250 > m...and the distCST_ is 550 m.... > > my question is, why is this huge difference? as this will affect the > performance...and is it required by the standard? I just couldn't find > anything supporing this issu.....I would appreciate it, if anyone could > tell me where I can find any explanation about this issue..
It is a common missunderstanding that the transmission / carrier sense (interference) range is set to 250 / 550m. They are just the results of the choosen propagation model, transmission power, antenna gains, TX/CS thresholds. I have to emphasis it again: you CANNOT set the transmission range of a WLAN device (you can only set all named parameters to result in a desired range). The default values in ns2 are not very realistic. If you are developing new WLAN protocols you should at least use the Shadowing propagation model. Daniel. -- Dipl.-Inf. Daniel Mahrenholz, University of Magdeburg, Germany Homepage: http://ivs.cs.uni-magdeburg.de/~mahrenho
