Marghanita da Cruz marghanita at ramin.com.au
Tue Apr 7 14:39:27 AEST 2009

Michael Skeggs mike at bystander.net wrote:
> 2009/4/7 Marghanita da Cruz <marghanita at ramin.com.au>:
>> Model the cost of 3G wireless vs FTTH coverage for the 250,000
>> people in Canberra.
>> Marghanita
> I believe the constraint on such a deployment would be having enough
> free channels to allow simultaneous access to enough of those people.
> As there is only a set amount of spectrum for 3G, it can only
> accommodate so many concurrent users per base station. You cannot
> build another base station next door as there is too much overlap
> between the channels. I understand even with a code division protocol
> there are pretty low ceilings on how many concurrent users can operate
> in a given geographic area.
> I'd love one of the more radio savvy LINKers to fill this in with
> examples or figures.
> Regards,
> Michael Skeggs
I do not claim Radio Savvyness but would speculate the simultaneous access problem
has occurred and been addressed temporarily at pop concerts and football matches.
As well as daily in New York, London, Beijing and Sydney.

Curiously, I recall a similar speculation about the limitation of Ethernet many 
years ago.

The problem with Canberra (and a lot of Australian Cities) is the low density -
making deployment of cable uneconomical. Whereas in India and China you would
not be able to lay cable fast enough.

Marghanita da Cruz
Phone: (+61)0414 869202

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