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Re: [6gip] 6G

Alexandre Petrescu <alexandre.petrescu@gmail.com> Thu, 14 January 2021 15:30 UTC

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To: Lars Eggert <lars@eggert.org>
Cc: "Flinck, Hannu (Nokia - FI/Espoo)" <hannu.flinck@nokia-bell-labs.com>, "6gip@ietf.org" <6gip@ietf.org>, Kaippallimalil John <john.kaippallimalil@futurewei.com>
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From: Alexandre Petrescu <alexandre.petrescu@gmail.com>
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Date: Thu, 14 Jan 2021 16:30:38 +0100
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Subject: Re: [6gip] 6G
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Le 14/01/2021 à 16:27, Lars Eggert a écrit :
> 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.

If I cant expect ping to report a micro-second RTT on 6G, then should I 
expect it to report a few hundred micro-seconds?

Alex

> 
> Lars
> 
> 
>> Or maybe hundreds of micro-seconds latency on 6G?
>>
>> Or maybe milli-seconds latency on 6G?
>>
>> Alex
>>
>> --
>> 6gip mailing list
>> 6gip@ietf.org
>> https://www.ietf.org/mailman/listinfo/6gip
>

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