net_review2 - Quick Review on Data Link Layer Part 2...

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1 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
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2 Selected wireless link standards 384 Kbps 384 Kbps 56 Kbps 56 Kbps 54 Mbps 54 Mbps 5-11 Mbps 5-11 Mbps 1 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
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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
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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
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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
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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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net_review2 - Quick Review on Data Link Layer Part 2...

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