Re: [ns] About wireless bandwidth

["Wings" <wings@cis.nctu.edu.tw>]

Dear Sir,

I calculate the TCP packet seq. numbers as the rate.
For example,set TCP PacketSize=1000bytes , time=Ts
                             1000*8*seq. num
                    rate=--------------------- = x bps
                                        T
The calculate rate with such method is the rate of application ?

Besides, I run the simulation in wired network and set link bandwidth 2Mbps.
Its rate can achieve 2Mbps. Why? The overhead doesn't exist in wired ?

    Thanks.

Wings

----- Original Message -----
From: "Ya Xu" <yaxu@ISI.EDU>
To: "Wings" <wings@cis.nctu.edu.tw>
Cc: <ns-users@ISI.EDU>
Sent: Sunday, October 14, 2001 2:12 AM
Subject: Re: [ns] About wireless bandwidth


>
> If you are talking about the rate of your application,
> it can not reach 2M because of the protocol overhead in
> transport and mac etc.
>
> -ya
>
> On Fri, 12 Oct 2001, Wings wrote:
>
> > Dear ns-users,
> >
> >     The default value of wireless bandwidth is 2Mbps.
> > Because wireless channel is broadcast environment.
> > if only one TCP flow is start up,it can use all the channel.
> > But its rate can't achieve 2Mbps. Why?
> >
> >     Thanks.
> >
> > Best regard,
> > Wings
> >
> >
>