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Re: [6gip] 6G

Lars Eggert <lars@eggert.org> Thu, 14 January 2021 15:27 UTC

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From: Lars Eggert <lars@eggert.org>
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Date: Thu, 14 Jan 2021 17:27:36 +0200
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Cc: "Flinck, Hannu (Nokia - FI/Espoo)" <hannu.flinck@nokia-bell-labs.com>, "6gip@ietf.org" <6gip@ietf.org>, Kaippallimalil John <john.kaippallimalil@futurewei.com>
To: Alexandre Petrescu <alexandre.petrescu@gmail.com>
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Subject: Re: [6gip] 6G
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On 2021-1-14, at 16:07, Alexandre Petrescu <alexandre.petrescu@gmail.com> wrote:
> It might be that cables and fibers already (and always have) transmit
> each bit at almost the speed of light

Correct.

> , even though the bandwidths we
> experienced across generations has always increased.

That's because throughput increased.

>> Multiple flows do not decrease latency, they (only) increase throughput.
> 
> Hmm, but there has always been a tight relationship between bandwidth
> (throughput?) and latency on the same medium.  On Ethernet, higher
> bandwidth meant lower latency.  On 3G, 4G, 4G too.  On WiFi too.

The serialization component of latency goes down with increased throughput. Speed-of-light doesn't.

> Also, one parameter of throughput is the size of the data to be sent.
> Distributing that data on two channels halves that size, so throughput
> is increased.

Sure, but throughput is not latency.

I think you are confusing latency and transmission time (for a given amount of data.)

> With these two things I think I can reasoably assume that ping on 6G
> might display micro-second latencies (RTT, round trip time)?

No, you can't.

Lars


> Or maybe hundreds of micro-seconds latency on 6G?
> 
> Or maybe milli-seconds latency on 6G?
> 
> Alex
> 
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