Halo
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The document provides information about the HALO (High Altitude Long Operation) Network, which is a proposed wireless broadband network that would use high altitude platforms stationed (HAAPS) in the stratosphere to provide connectivity. Key points: - HALO Network would combine advantages of terrestrial and satellite networks by using airplanes stationed at high altitudes as central hubs. - The network would use multiple beam antennas on airplanes to provide coverage to ground cells over a large area of up to 3000 square miles. - The system is proposed to provide broadband services like internet, telephony, broadcasting to customers using low-cost user terminals with minimal power requirements. - Benefits listed are large coverage
Halo
- 3. Contents Introduction HALO Network System architecture HALO Aircraft Spectrum allocation Reference model User terminal HALO Network services Advantages Conclusion Reference
- 4. 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
- 5. 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
- 6. 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
- 7. 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.
- 10. 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
- 12. 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
- 14. 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)
- 17. 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
- 20. 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.
- 21. 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
- 23. 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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