Re: [6gip] 6G

[David Lake <[e-mail]>]

Alex

I'm sorry, but I do have to pick you up again on this comment:

" The choice of placing base stations is a matter of planning and agreements with the local Mayor or administrators of the real estate (oftentimes without involving the Citizen, but that's an Ethics issue)."

At least in the UK, mobile phone masts are a matter of great controversy and many (in fact the majority) of planning applications are denied.  As technologists, we do not live in a cultural or political vacuum and we need to be designing solutions that are acceptable to the people that are our customers, the public, and we must be aware of that. 

No-one wants to live surrounded by masts, pylons, cables, wires - they just don't look very nice!  We're all trying to improve our natural environment.  The outcry over the 5G mast which was planned for Brighton was huge and rightly so.  The residents decided that it was much better to have a view of the sea a view of a 6-bay antenna system. 

Now, if we as engineers can design invisible systems that provide decent services, we're on to a winner. 

One thing that is obvious from this pandemic is that people want to live in rural locations more where objections are much higher and people do not want to be surrounded by metal and plastic!

David


-----Original Message-----
From: 6gip <[e-mail]> On Behalf Of Alexandre Petrescu
Sent: 14 January 2021 11:33
To: Lars Eggert <[e-mail]>
Cc: Flinck, Hannu (Nokia - FI/Espoo) <[e-mail]>; [e-mail]; Kaippallimalil John <[e-mail]>
Subject: Re: [6gip] 6G



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.

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.

The choice of placing base stations is a matter of planning and agreements with the local Mayor or administrators of the real estate (oftentimes without involving the Citizen, but that's an Ethics issue).

The choice of placing base stations might also have to do with the technology used in that base station, and about the form of the landscape in the area.  It has to do with how waves propagates and reflects.

Active base stations vs intelligent reflecting surfaces, beam forming, and other wave propagation improvement tools will not prevent this efficient placement, and thus the obtention of higher bandwidths.

BEsides, there is also the parallelism principle: if 1microsecond cant be achieved by one light stream then it might be achieved by two 
simultaneous light streams, or 4, and so on.   If it can be achieved by 
n lighstreams then it can be achieved by m (larger than n) THz streams. 
  It seems light is in the range 400-700 THz.

Or maybe that's where 'fully optical' might join fiber to smartphones...

Alex

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