Cell Telephony.


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Propelled Mobile Phone System (AMPS) is North American standard ... Worldwide System for Mobile Communications. FDMA & TDMA. 124 channels. 200kHz recurrence ...
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Cell Telephony

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Agenda Wireless outline Basics of cell telephony Paper: connection mindful correspondence Thursday WPAN: Short-extend remote (IR, RF) Next week: Tuesday: WPAN applications Thursday: protection Mobile and Ubiquitous Computing

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Wireless Technologies Overview Wireless Wide Area Network (WWAN) Based on cell telephony GPRS, CDPD, UMTS, CDMA2000 Wireless Local Area Network (WLAN) 802.11b (2.4 GHz), 802.11b (5.8 GHz) Wireless Personal Area Network Bluetooth, IrDA, 802.15 Mobile and Ubiquitous Computing

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Cellular telephony Late 1970s - first simple frameworks First in Scandanavia and Japan Advanced Mobile Phone System (AMPS) is North American standard Base stations, handsets and the handoff Capacity of single cell and arrangement of cells See http://3g.cellular.phonecall.net/secrets.html#htop Operate in 800-900 MHz and 1800-2100 MHz Mobile and Ubiquitous Computing

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Analog versus Computerized Digital cell: Voice sign is digitized Compressed voice transmitted speedier than continuous, so frequencies can be shared, expanding limit Smaller handsets (less difficult hardware and lower power) Longer battery life since collectors/transmitters don\'t need to be continually on More administrations (SMS) Better voice quality generally Better confirmation to avoid misrepresentation Mobile and Ubiquitous Computing

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Signal transmission Mobile and Ubiquitous Computing

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Signal transmission Frequency adjustment (FDMA) Analog procedure Time Division Multiple Access (TDMA) Each recurrence channel isolated into time spaces Works on the grounds that digitized voice is compacted Code Division Multiple Access (CDMA) Spread range utilizing pseudo irregular piece streams to scramble base station to handset correspondence Mobile and Ubiquitous Computing

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GSM Global System for Mobile Communications FDMA & TDMA 124 channels 200kHz recurrence transfer speed for every channel 8 time openings of 500 milliseconds (7 for voice) European standard GSM-900, GSM-1800 N. America GSM-1900 incongruent with AMPS Mobile and Ubiquitous Computing

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Wide Area Data Circuit-exchanged information simple telephone with modem (9.6 - 14.4 Kbps) pay while associated must start association Cellular Digital Packet Data (CDPD) clear points of interest over circuit-exchanged Initial CDPD offered 19.2 Kbps Mobile and Ubiquitous Computing

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GSM and Data Regular GSM Circuit-exchanged One time-space can convey 9.6 Kbps High Speed Circuit Switched Data (HSCSD) Uses up to 4 time openings to acquire 38.4 Kbps General Packet Radio Service (GPRS) Packet-changed Uses up to 8 time spaces to get more than 100 Kbps Mobile and Ubiquitous Computing

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Generations of telephony http://www.iec.org/online/instructional exercises/umts/topic01.html 1G - Analog 2G - Digital e.g., GSM 2.5G – Digital with parcel exchanged information e.g., GPRS 3G – CDMA-based up to 2 Mbps e.g., W-CDMA and CDMA2000 Mobile and Ubiquitous Computing

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3G Various models overall W-CDM/UMTS (Europe and Japan) Successor to GSM CDMA2000 (U.S.) Attempt at overall institutionalization IMT 2000 Mobile and Ubiquitous Computing

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Specialized Mobile Radio introductory simple radio dispatch push to talk Motorola made advanced included for telephony, paging and bundle exchanged information Nextel is case Mobile and Ubiquitous Computing

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Other bundle exchanged Mobitex Originated in Europe In U.S. as BellSouth Mobile Data 8 Kbps What Palm VII use ARDIS Metricom Mobile and Ubiquitous Computing

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