While the concept of HAPS is interesting, I am not sure that I agree with
the economic arguments. All of the early HAPS were not economical when one
include the life cycle costs.
Do you have any information on vendors and their projected life cycle cost
for HAPS.
Harry
> -----Original Message-----
> From: Sing Lin [SMTP:[email protected]]
> Sent: Thursday, October 12, 2000 6:28 AM
> To: Smith JR, Harry E; Sat TCP mail list
> Subject: RE: Moving Targets
>
> Shaun:
>
> With proper engineering, one may use the terrestrial 3G IMT-2000 wireless
> systems in the densely populated area to serve the moving train and use
> the
> HAPS in the rural, low population density areas to serve the moving train.
>
> In densely populated areas, there are enough subscribers to justify
> deployment of terrestrial 3G IMT-2000 systems, whereas in the rural, low
> population density areas, it is more economical to deploy HAPS. Since
> terrestrial 3G IMT-2000 systems will not be deployed in rural areas, there
> is less possibility of radio interference problems for HAPS to operate in
> the 2 GHz IMT-2000 frequency bands in the rural areas.
>
> Sing Lin
> ***********
>
> Abheek:
>
> In addition to the 70 GHz band allocation for HAPS, the proponent of HAPS
> also proposed HAPS for the 2GHz band allocated for the 3G IMT-2000
> wireless
> systems. Substantial work have been done on the frequency coordination
> criteria and coordination distance to make sure that HAPS and terrestrial
> and satellite based 3G IMT-2000 wireless systems will not interfer with
> each
> other. Therefore, under suitable conditions, HAPS may operate in the 2 GHz
> IMT-2000 bands.
>
> Sing Lin
> ***************
>
> Shaun:
>
> USA, Japan and Europe have been doing substantial R&D on High Altitude
> Platform Station (HAPS) in recent few years. The technical contributions
> from these R&D sources to ITU-R WP8F/TG8/1 in the last two years have
> resulted in a Preliminary Draft New Recommendation (PDNR) and a Draft
> Handbook on HAPS in ITU-R WP8F working on the Third Generation (3G)
> wireless
> technologies and beyond. Therefore, HAPS is a serious project and
> technology
> to consider. Each platform is at about 21 Km above the ground and can
> cover
> a very large area.
>
> Sing Lin
>
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