Re: [gaia] Heterogeneity in network capacity: growing?

Henning Schulzrinne <hgs@cs.columbia.edu> Mon, 29 February 2016 18:32 UTC

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From: Henning Schulzrinne <hgs@cs.columbia.edu>
Date: Mon, 29 Feb 2016 13:31:40 -0500
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To: Michael Welzl <michawe@ifi.uio.no>
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Cc: "gaia@irtf.org" <gaia@irtf.org>, Manner Jukka <jukka.manner@aalto.fi>
Subject: Re: [gaia] Heterogeneity in network capacity: growing?
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I'm not sure this is a well-defined question. For example, if you are
running a video service, the prevalence of modem connections (still about
1% in the US - https://www.census.gov/history/pdf/2013comp-internet.pdf) is
of somewhat limited interest except to the extent that they'd cut into your
addressable market. Thus, the question might be better phrased as "how many
people are you willing NOT to reach for a given application" in a
particular market. Also, in many cases, high-speed wireless data (e.g.,
LTE) may be available, but data charges are sufficiently high that many
people will be reluctant to use them for more than a few MB/month.

In many rural areas in the US (and elsewhere), a big problem is diurnal
variation of Internet speed - you might get 3 Mb/s at 2 am, but get 20%
packet loss at 5 pm.

Thus, theoretically, the dynamic range keeps increasing since the lowest
speeds never go away, but the top available speeds keep increasing, but
that may be no more interesting than noting that the range of memory
capacities now ranges from a few kB in a light switch to PB in a data
warehouse.

Henning

On Mon, Feb 29, 2016 at 11:26 AM, Michael Welzl <michawe@ifi.uio.no> wrote:

>
> > On 29. feb. 2016, at 10.11, Manner Jukka <jukka.manner@aalto.fi> wrote:
> >
> > Hi,
> >
> > I don’t have a published analysis to cite, have done similar comparisons
> many times in various presentations. I could run that distribution from the
> Netradar database for 2014 and 2015, just need to give me the X buckets
> where to allocate the samples.
>
> NetRadar data would definitely be nice as a data point!  About buckets,
> not sure I get it: I mean e.g. a CDF of bandwidth values that were seen
> overall in 2014 and 2015; that would show if there is a shift not only
> towards higher bandwidths but if the diversity als increases, I guess.
>
> If you need to have buckets to query, I guess it can be any reasonable low
> / high bandwidth values… the question is, do the low bandwidths disappear
> as quickly as the higher ones pop up?
>
>
> > Market analysis is a bit trickier, since measurements need to be mapped
> to a region somehow. IP address is one option if it can be trusted enough.
>
> *I* don’t actually care about markets much. I just wonder what range of
> bandwidths network protocols need to be able to operate over… is it always
> the same range or is the range growing (as I suspect)?
>
> Cheers,
> Michael
>
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