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bts communications ii l.
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amanda-beasley
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BTS

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  1. BTS – Communications II Requirements and Technologies CSE 8394

  2. BTS Communication • Requirements • Redundant links for robustness • Terrain and distance dependent • Compatible/non-interfering with existing systems • Technologies • Satellite • RF, Microwave • Fiber-optic • Commercial phones (land lines and wireless • IP Links CSE 8394

  3. Satellite Orbits • Low Earth Orbit (LOE) • 200- 1000 Miles Above Ground Level • .03 Second Roundtrip Latency for Upload and Download • Used by military satellites • Middle Earth Orbits (MEO) • 6250 - 13000 Miles Above Ground Level • .06 to .14 Second Roundtrip Latency • Geo-synchronous Orbit • 22,300 Miles Above Ground Level • .24 Second Roundtrip Latency • Used by most commercial satellites CSE 8394

  4. Satellite Remote Sensing • Optical • Radar • Insensitive to weather • Sensitive to ground conditions CSE 8394

  5. Microwave Links • Benefits: • No need to dig • Only option over inhospitable terrain or congested areas • Despite low cost, broadcast level video quality • COFDM (Coded Orthogonal Frequency Division Multiplex) helps in the noisy urban areas • Excellent for ad hoc deployment • Specs • Single channel (To collecting points) • Multi-channel CSE 8394

  6. Typical Setup CSE 8394

  7. Microwave Repeaters CSE 8394

  8. COFDM Advantages CSE 8394

  9. Advanced Microwave Setup CSE 8394

  10. Advanced Microwave Setup (Relay) CSE 8394

  11. New Technologies Courtesy: ParcelCall CSE 8394

  12. Generations of Wireless Technologies • 1G: 1979-1992 analog wireless technology • 2G: current digital wireless technology • TDMA (GSM: Global Systems of Mobile Communication) • CDMA • 2.5G: interim technology accommodates graphics • 3G: non-IP based technology (2001-2005) supports rich media (video clips) • 4G: fully IP-based network (2006-2010) • GPRS: General Packet Radio Services • WCDMA: Wideband CDMA CSE 8394

  13. Wireless Technologies (Cont’d) • GPS: Satellite-based Global Positioning System • SMS: Short Message Service (e-mail, up to 160 characters) • EMS: Enhanced Messaging Service • Extension of SMS; simple animation, tiny picture, short melody • MMS: Multimedia Messaging Service • Rich media of next generation • UMTS: Universal Mobile Telecommunications System for 3G mobile standard • WAP: Wireless Application Protocol for Internet Browsing CSE 8394

  14. Automated Vehicle Location (AVL) • GPS to track vehicles • Already more than a million vehicles in the US with AVL • $3 billion business by 2007 • In line with the new vision for BTS CSE 8394

  15. New Interesting Proposals • Airships • Comparison with UAVs, Satellites CSE 8394