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Re: [ns] About wireless bandwidth
Dear Sir,
I f I want to set the MAC bandwidth of wired link , how can I do?
Thanks.
Wings
----- Original Message -----
From: "Jun Zhao" <[email protected]>
To: "Wings" <[email protected]>; "Ya Xu" <[email protected]>
Cc: <[email protected]>
Sent: Tuesday, October 16, 2001 2:39 PM
Subject: Re: [ns] About wireless bandwidth
> I think bandwidth at link is not the same as in MAC or PHY. If one set MAC
> bandwidth_ as 10mb, the equivalent bandwidth_ seen from higher layers may
be
> 8mb or less.
> ----- Original Message -----
> From: "Wings" <[email protected]>
> To: "Ya Xu" <[email protected]>
> Cc: <[email protected]>
> Sent: Monday, October 15, 2001 12:49 PM
> Subject: Re: [ns] About wireless bandwidth
>
>
> >
> > 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" <[email protected]>
> > To: "Wings" <[email protected]>
> > Cc: <[email protected]>
> > 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
> > > >
> > > >
> > >
> >
> >
>