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Date:26-3-15
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HALO
HIGH ALTITUDE LONG OPERATION
Contents Introduction
HALO Network
System architecture
HALO Aircraft
Spectrum allocation
Reference model
User terminal
HALO Network services
Advantages
Conclusion
Reference
INTRODUCTION• Demand for broadband wireless multimedia network
growing rapidly.
• HALO Network is a wireless MAN.
• High Altitude Aeronautical Platform Station (HAAPS) is
the technology used here.
• It combines the advantages of two well established
wireless communication networks,
Terrestrial networks
Satellite networks
SATELLITE COMMUNICATION NETWORK
Here the central node is satellite orbiting around the earth
in space. They have high look angles.
Disadvantages
• Expensive
• High power user terminals
• Long propagation delay
• Complex structure
• Cannot be maintained easily
• System capacity will be fixed
TERRESTRIAL COMMINICATION NETWORK
It is simple wireless communication networks
used in cellular and personal communication systems. It
have low look angles.
Advantages
• Less expensive
• Low power user terminals
• Short propagation delays
• Scalability of capacity
• Easy to maintain
HALO NETWORK Located at atmosphere above commercial airline traffic
and below satellite networks
Wireless MAN uses a star topology
HALO/proteous air plane is the central hub of the network
Provides many types of service
HALO aero plane is specially designed to
carry the hub devices and they are having long
lifetime.
HAAPS is the basic idea behind HALO.
SYSTEM ARCHITECTURE
HALO/Proteus airplane
• It is a specially designed aircraft which can carry weight
of approximately 900 Kg.
• The fuselage consists of ATM switches spot beam
antennas, multi beam antennas ,transmitters and receivers.
• A fleet of 3 aircrafts are cycled in shifts to achieve
communication above an isolated city
• Air plane maintains height in range 51,1000 to 60,000 ft.
• The cone of commerce have diameter of 100 km at the
Minimum Look Angles(MLA) of 20 degree.
• It can cover an area approximately 2000-3000 square
miles
SPECTRUM ALLOCATION Variety of spectrum can be utilized by HALO
# LMDS( Local Multimegabit Data Service at 28 GHz
# Micro wave point to point at 38Ghz
• HALO utilizes multiple beam on ground arranged in
cellular pattern with each cell cover more than several
square miles of area.
• Dwell time: time duration for given beam spot at a
particular cell
• Ratcheting action provide beam to beam hand over and
communication when aircraft is orbiting
REFERENCE MODEL
With in HALO network 4 types of elements are connected,
• Customer premises Equipment(low rate terminals)
• Business premises Equipment(high rate terminals)
• HALO Gate way( interfaces to non-HALO network)
• Network control stations(control and maintenance)
3 types of signaling interfaces are there
• UNI(User Network Interface)
• B-ICI
• NNI(Network Node Interface)
SUBSCRIBER UNITS
It consist of three major sub group RF unit,NIU(Network
interface unit),and application terminals such as PC,
PSTN, video terminals
The RF unit consists of tracking circuitary,MMW
transmiter and receiver.
The NIU consists of high speed modulators demodulators
multiplexers and demultiplexers.
The L band Frequency is used as IF for communication
The connection between RU and NIU provided by coaxial
pair cables
Minimal cost and easiness to maintain
HALO Network Services
Schools hospital,small,large,business… etc will get
benefit of HALO.
Widely separated customers can receive same
communication as in entertainment broadcasting
Mobile telephone services,paging one way broadcasting
and satelite concentrator.
HALO PSTN interface provides services such as e-
commerce web browsing …etc
LAN ethernet bridging
Service is based on “band width on demand”,providing
efficient use of available spectrum.
Seamless large range multimedia services
Can use in marine communication system.
ADVANTAGES
Capacity in range(10-100)Gb/sec
Low cost easy to maintain
Easy to implement
Low power unobstructed communication
Low propagation delay
Maximum use of bandwidth
Can be connected to non halo networks
It is stabilized
It uses broad band protocols ATM and SONET
HALO Network coverage
CONCLUSION
The HALO network can serve thosands of
subscribers within a metropolitan area,by offering
access throughout the networks signal.It has a lot
of advantages and can provide excellent service
over a wide range of area.Thus the HALO is really
a great invention in the world of wireless
communication networks.
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