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High Altitude Long Operation
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ContentsIntroductionHALO NetworkSystem architectureHALO
Aircraft
Spectrum allocationReference modelUser terminalHALO Network
servicesAdvantagesConclusionReference
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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 networksSatellite
networks
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SATELLITE COMMUNICATION NETWORKHere 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
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HALO NETWORKLocated at atmosphere above commercial airline
trafficand below satellite networks
Wireless MAN in star topologyHALO/proteous air plane is the
central hub of the networkProvides many types of service
HALO aero plane is specially designed for carry thehub devices
and they are having long lifetime.HAAPS is the basic idea behind
HALO .
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SYSTEM ARCHITECTURE
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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
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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 severalsquare
miles of area.
Dwell time: time duration for given beam spot at a particular
cell
Ratcheting action provide beam to beam hand over
andcommunication when aircraft is orbiting
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REFERENCE MODELWith 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)
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SUBSCRIBER UNITSIt 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 transmiterand
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
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HALO Network Services
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Schools hospital,small,large,business etc will get
benefit of HALO.Widely separated customers can receive
samecommunication as in entertainment broadcastingMobile telephone
services,paging one way broadcasting
and satelite concentrator.HALO PSTN interface provides services
such as e-commerce web browsing etc
LAN ethernet bridgingService is based on band width on
demand,providingefficient use of available spectrum.Seamless large
range multimedia services
Can use in marine communication system.
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ADVANTAGESCapacity in range(10-100)Gb/sec
Low cost easy to maintain
Easy to implementLow power unobstructed communicationLow
propagation delayMaximum use of bandwidth
Can be connected to non halo networksIt is stabilizedIt uses
broad band protocols ATM and SONET
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HALO Network coverage
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DEVELOPMENTS IN CONCEPT
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CONCLUSION
