The High Altitude Long Operation Network is a
broadband wireless metropolitan area network,
with a star topology, whose solitary hub is
located in the atmosphere above the service
area at an altitude higher than commercial
The initial capacity of the network will be on
the scale of 10 Gb/s, with growth beyond 100
The HALO/Proteus airplane is the central node
of this network.
It will fly at altitudes higher than 51,000 ft.
The HALO Network is capable of providing
high rate communications to users of
multimedia and broadband services.
The feasibility of this approach is reasonably
assured due to the convergence of technological
These technologies are individually available, to
a great extent, from commercial markets.
The HALO™ Network seeks to integrate these
various technologies into a service of high utility
to small and medium businesses and other
multimedia consumers at a reasonable cost.
"The demand for Internet services is exploding
and this creates a strong demand for
broadband, high data rate service. It is
expected that there will soon be a worldwide
demand for Internet service in the hundreds of
millions". (Lou Gerstner, IBM, April 1997) The
growth in use of the World Wide Web and
electronic commerce will stimulate demand for
There are various facts that show the strong
interest in wireless communications in India:
million subscribers to wireless
28 million dollars annual revenue for
38,000 cell sites with 37 billion dollars
cumulative capital investment
40% annual growth in customers
25 million personal computers sold each
50 million PC users with Internet access
7. High-Speed Data Links Transmitted Over Millimeter Wave Frequencies Provide
Broadband Data Services to Various End-Users
The key features of the HALO Network are
Seamless ubiquitous multimedia services
Adaptation to end user environments
Enhanced user connectivity globally
Rapidly deployable to sites of opportunity
Secure and reliable information transactions
Bandwidth on demand provides efficient use of
Most metropolitan areas will fit within a signal
"footprint" of 40-60 miles diameter.
The following figure shows the coverage of a 50mile HALO™ Network service-area footprint
for the New York City metropolitan area.
Notice that "double coverage" of certain areas
occurs due to overlapping adjacent footprints.
This provides higher reliability links and
reduces blocking factors on requests for service.
The footprint over Manhattan covers 4.8 million
households or 12.5 million people.
The HALO Network accommodates the following
Adaptation to end user environments
deployable to sites of
Bandwidth on demand for efficient use
of available spectrum
11. The HALO™ Network Architecture
The HALO network has several advantages over
terrestrial wireless networks. The latter have
complex geometries involving many base
stations interlinked by cabling or microwaves.
On the other hand, satellite networks require
more expensive terminals with high power to
achieve the same data rates possible through the
The capacity of a satellite network can be
increased, but at higher expense than the HALO
Network, typically only by adding more
The HALO network will provide wireless
broadband communication services. The feasibility
of this network is assured due to a convergence of
The HALO Network is predicated on the
successful integration of these technologies to offer
communications services of high quality and
utility to small and medium-sized businesses at
While a variety of broadband access modalities are
promising for the U.S. markets, the HALO
Network may be a winner for "green field"
deployment, especially in regions where the
existing infrastructure is not amenable to an
upgrade or retrofit.