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
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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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