Ok I went through the audio archive - and Tom Phelan points out the
same problem - that some implementations average the loss intervals
over 8 samples even though there are less than 8..So I guess - the
correct thing would be to average them based on the no of samples
currently available..So the ns-2 code needs to reflect the change..My
few cents - do correct me if I am wrong :)
-A
On 4/20/06, Arjuna Sathiaseelan <arjuna.sathiaseelan@xxxxxxxxx> wrote:
> Dear Jeroen,
> I concur with your views - I guess this question was raised in the
> recent IETF
> meeting. Maybe someone can shed proper light on this :).
>
> Regds,
> Arjuna
>
> On 4/20/06, Jeroen Van Velthoven <jeroen.vanvelthoven@xxxxxxxx> wrote:
> > Dear all,
> >
> > I am performing some experiments with DCCP/TFRC. Therefore, I'm using the
> > DCCP implementation of Mattsson. My question relates to the calculation of
> > the average loss interval as it is done by this implementation. As
> > specified the TFRC RFC, the 8 most recent loss intervals are used to obtain
> > the average loss interval. However, also when the first loss event occurs
> > and in every situation where the number of initialized loss intervals is
> > strictly smaller than 8, this implementation takes the sum W_{tot} of all 8
> > weights and uses this result to determine the average loss interval.
> >
> > I would assume that when the loss history contains only two loss intervals,
> > it is sufficient to take only these weights into account when calculating
> > W_{tot}. This would not result in an overestimate of the loss event rate
> > you get by taking into account the total of the 8 weights.
> >
> > Can anyone confirm that the number of weights you need to use to obtain the
> > average loss interval equals the minimum of 8 and the number of the actually
> > created loss intervals?
> >
> > Best Regards,
> > Jeroen
> >
> > -------------------------------------------------------------------
> > Jeroen Van Velthoven
> >
> > Phone: +32 (0)3 265.38.53
> > Fax: +32 (0)3 265.37.77
> > Email: Jeroen.VanVelthoven@xxxxxxxx
> >
> > University of Antwerp (UA)
> > Dept. Mathematics and Computer Science
> > PATS Research Group
> > Campus Middelheim, building G
> > Middelheimlaan 1
> > B-2020 Antwerp
> > Belgium
> > -------------------------------------------------------------------
> >
> >
> >
> >
> >
>
>
> --
> Regards,
> Arjuna
>
> Postdoctoral Researcher
> Engineering Research Lab,
> Department of Engineering,
> University of Aberdeen
>
--
Regards,
Arjuna
Postdoctoral Researcher
Engineering Research Lab,
Department of Engineering,
University of Aberdeen
