Re: [ns] proper values for 11Mbps wireless simulation

[Marceau Coupechoux <marceau.coupechoux@ms.alcatel.fr>]

Hi,

Does someone know what is the bandwidth used in 802.11b to transmit
RTS/CTS and ACK packets? I think that it is 1Mps in order that all cards
are able to ear them,
bye,
Marceau

Joe Macker wrote:
> 
> At 10:12 AM 6/28/2001 +0200, Felix Ko wrote:
> >Hi!
> >
> > > What I have done is only to change bandwidth_ of Phy/WirelessPhy to 11e+6.
> >
> >Are you sure that the "bandwidth_"-parameter of "Phy/WirelessPhy" really
> >effects the time/speed of your packet-transmissions?
> >
> >In my opinion, it's only used to calculate the energy consumed during
> >the transmission.
> >
> >If you want to toggle the transmission speed, you should
> >use the "bandwidth_" parameter of "Mac/802_11"...
> 
> Just a cautionary note to those that may try this.
> 
> If one does do this, to say simulate lower data rate "802.11-like" links,
> it would be wise to also reevaluate the other MAC timer settings at the
> lower layer (e.g., RTS/CTS, ack response,etc).  Many of these settings are
> customized for the specific transmission rates and max delay assumptions
> and anomalous behavior could result at other tweaked link rates.  In other
> words, one should check if the additional MAC layer framing and protocol
> timers under the hood are scaled when transmission speed or max delay
> (could also relate to transmit power and range) is modified in an ad hoc
> manner.
> 
> >Bye
> >
> >Felix

-- 
Marceau Coupechoux
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