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Re: [6gip] 6G

Lars Eggert <lars@eggert.org> Thu, 14 January 2021 12:12 UTC

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From: Lars Eggert <lars@eggert.org>
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Date: Thu, 14 Jan 2021 14:12:13 +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 13:33, Alexandre Petrescu <alexandre.petrescu@gmail.com> wrote:
> Le 14/01/2021 à 09:52, Lars Eggert a écrit :
>> The limits here are due to physical constraints - the speed of light in vacuum is about 300000 km/sec. An RTT of 1us means that the maximum distance to a base station needs to be below 150m. (Not including coding overheads, etc.)
> 
> The distance situation of base stations is not an impediment to achieve high bandwidths.

Of course it's not (quite the opposite).

But your "1 us" latency requirement means that your network will not be able to support longer distances, which makes it effectively a LAN.

> The presence of too many base stations was felt as a drawback also at the time prior to existence of mobile telephony.  But nowadays there are many base stations in densely populated areas, such as stadiums, markets and more.  Some times they might even be at a few hundred meters distance.

Yes, sometimes. But if you intend to prescribe a "1 us" radio RTT limit for "6G", *all* UEs must be closer than 150m to at least one base station at *all* times, due to speed-of-light.

This seems highly optimistic for a WAN. Or is your view of "6G" that of a network for urban areas only?

Lars

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