Halo Network

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Text of Halo Network

  • 1.

2. Contents

  • What is HALO ?
  • The System Architecture
  • HALO Network concepts
  • Advantages over satellite and terrestrial networks
  • Power system and system requirements
  • Desirable Features
  • Application

3. What is HALO ?

  • The High Altitude Long Operation Network TMis a broadband wireless metropolitan area network, with a star topology.
  • High Altitude Aeronautical Platform Station (HAAPS) is the technology used here.
  • The HALO network will be located in the atmosphere, at an altitude miles above terrestrial wireless, but hundreds to thousands of miles below satellite networks.
  • HAAPS means a solar powered unmanned airship capable of long endurance-may be of several years.

4. System architecture

  • HALO Aircrafts contains network elements including an ATM switch, spot beam antennas, and multibeam antennas, as well as transmitting and receiving electronics.
  • The antenna array provides cellular-like coverage of a large metropolitan area.
  • The HALO network can be connected to non-HALO networks, such as ATM networks, Internet, and frame relay via an HG/interworking unit (IWU).

5. 6. Types of HAAPS

  • Lighter than air HAAPS are kept stationary. They are probably air balloons floating in air.
  • Other type is Airplane based HAAPS which are flown in a tight circle.
  • For broadcast application a simple antenna beams signals to terminals on the ground.

7. 8. HALO Network concepts

  • HALO Aircraft present a new layer in the hierarchy of wireless communication - a 10 mile tall tower in stratosphere.
  • It is in a level above rain shower and below meteor shower.
  • HALO Network plane is the central node of the broad band communication.
  • The capacity is in the range of 10-100 Gb/s.

9. 10. Elements of HALO Network

  • A MMW antenna array and its related components will be located in a pod suspended below air craft fuselage.
  • Antenna array will produce many beams typically more than 100.
  • Each beams will be separated by a fixed frequency.

11. Advantages

  • Over satellite network
  • Satellite network have expensive high power user terminal and long propagation delay.
  • system capacity is practically fixed.
  • Establishinga new satellite is very expensive.

12. Advantages

  • Over Terrestrial network
  • Terrestrial networks have low look angles and complex infrastructure.
  • They require many base stations that must be interlinked with cables.

13. Power system and system requirements

  • Aircrafts power system consist of photovoltaic cell and a regenerative fuel cell.
  • Advantage of using this is that it eliminates the need of and compress air at high altitude.
  • Aircraft size increases with increasing altitude.

14. Aero plane properties

  • The HALO aircraftswill be operated in shifts from regional airport.
  • HALO aero plane is specially designed forcarry the hub devices and they are having long lifetime.
  • Look angle will be greater than 20 degree.
  • So the network will available in a super metropolitan area(includingurban, suburban and surrounding rural area).

15. Other properties

  • HALO network can interface with the local LAN connections.
  • It can Interface between broadband protocols like ATM and SONET.
  • The HALO network will provide access to the PSTN and become the backbone for internet services like world wide web.

16. Subscribers Network relation 17. Desirable Features

  • Seamless multimedia services.
  • Adaptation to end user environment.
  • Rapidly deployable to sites of opportunity.
  • Bandwidth on demand for efficient use of available spectrum .

18. Applications

  • Widely separated customers can receive same communication asi n entertainment broadcasting.
  • We can accessinteractive TV and internet.
  • Costumers can have large coverage area in telecommunicationcompared to terrestrial network.
  • Can use as a communication techniques for remote areas.
  • Can use in marine communication system.

19. HALO Network coverage 20. References

  • J. Martin and N. Colella, "Broadband Wireless Services from High Altitude Long Operation (HALO) Aircraft,"Proc. of the SPIE International Symposium on Voice, Video, and Data Communications: Broadband Engineering for Multimedia Markets , 2000 .
  • G. Djuknic, J. Freidenfelds, et al., "Establishing Wireless Communications Services via High-Altitude Aeronautical Platforms: A Concept Whose Time Has Come?"IEEE Communications Magazine , September 2000.
  • www.angeltechnologies.com /techpapers