poster3 - 1 Chapter 3-4 Quick Review on Data Link Layer –...

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Unformatted text preview: 1 Chapter 3-4 Quick Review on Data Link Layer – Part 2 Jonathan C.L. Liu, Ph.D. Department of Computer, Information Science and Engineering (CISE), University of Florida 2 Selected wireless link standards 384 Kbps 56 Kbps 54 Mbps 5-11 Mbps 1 Mbps 802.15 802.11b 802.11{a,g} IS-95 CDMA, GSM UMTS/WCDMA, CDMA2000 .11 p-to-p link 2G 3G Indoor 10 – 30m Outdoor 50 – 200m Mid range outdoor 200m – 4km Long range outdoor 5km – 20km 3 Mobile Switching Center Public telephone network, and Internet Mobile Switching Center Cellular network architecture connects cells to wide area net manages call setup (more later!) handles mobility (more later!) MSC covers geographical region base station (BS) analogous to 802.11 AP mobile users attach to network through BS air-interface: physical and link layer protocol between mobile and BS cell wired network 4 Cellular networks: the first hop Two techniques for sharing mobile-to-BS radio spectrum • combined FDMA/TDMA: divide spectrum in frequency channels, divide each channel into time slots • CDMA: code division multiple access frequency bands time slots 5 Cellular standards: brief survey 2G systems: mainly designed for the voice channels only • IS-136 TDMA: combined FDMA/TDMA (north america) • GSM (global system for mobile communications): combined FDMA/TDMA – most widely deployed • IS-95 CDMA: code division multiple access 6 Cellular standards: brief survey 2.5 G systems: voice and data channels • for those who can’t wait for 3G service • general packet radio service (GPRS) – evolved from GSM – data sent on multiple channels (if available) • enhanced data rates for global evolution...
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poster3 - 1 Chapter 3-4 Quick Review on Data Link Layer –...

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