4a_Cell_

4a_Cell_ - 4 a The Mobile Telephone System Cell Networks 1...

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1 4 a. The Mobile Telephone System, Cell Networks 1. Introduction 2. First-Generation: Analog Voice a. Advanced System b. Channels c. Call management 3. Second-Generation: Digital; Voice a. D-AMPS 4. GSM-Mobile Communications a. System architecture b. Radio system c. Network and switching subsystem d. Operational subsystem e. Radio interface 5. CDMA 6. Third-Generation : Digital Voice/Data T. (pg 153-169) 7. CDMA2000
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2 Wireless varieties Cordless Mobile phones (cell phones). Mobile phones three generations : 1. Analog voice. 2. Digital voice. 3. Digital voice and data.
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3 FDMA AMPS NMT TDMA IS-136 TDMA GSM PDC GPRS EDGE IMT-SC IS-136HS UWC-136 IMT-DS UTRA FDD/W-CDMA IMT-TC UTRA TDD/TD-CDMA IMT-TC TD-SCDMA IMT-MC cdma2000 1XEV-DO 1XEV-DV IS-95 cdmaOne Cdma2000 1x CDMA 1G 2G 2.5G 3G Development of different generations of mobile systems GSM – 70% (Europe) AMPS – 3% PDC – 5% (Japanese) CDMA – 12% TDMA – 10%
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4 Cellular Wireless Network Evolution First Generation: Analog Voice (1946) AMPS : Advance Mobile Phone Systems (1982) Residential cordless phones Second Generation : Digital Voice (1990) IS-54; IS-136 : North American Standard - TDMA (1996) IS-95 : CDMA (Qualcomm) (1993) GSM: Pan-European Digital Cellular (1991) Iridium , 2002: Mobile Communication Satellite (1998) Third Generation: Digital Voice and Data (2000) IMT-2000 (cdma2000, W-CDMA/UMTS- Combines the functions of: cellular, cordless,
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5 1981 NMT 450 1986 NMT 900 1992 GSM 1994 DCS 1800 2000 GPRS analog digital 1983 AMPS 1991 D AMPS 1991 CDMA 1993 PDC 2001 IMT d-2000 Cellular phones Satellites 1982 InmarsatA 1988 InmarsatC 1992 InmarsatM 1998 Iridium Crdl.phone 1980 CTO 1984 CT1 1987 CTO 1989 CT2 1991 DECT Wireless LAN 199x proprietary 1997 IEEE 802.11 1999 IEEE 802.11b, 802.15 Bluetooth 2000 IEEE 802.11a 200? Fourth Generation (Internet based)
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6 1G; Advanced Mobile Phone System (AMPS) Frequencies are not reused in in a group of 7 adjacent cells To add more users, smaller cells can be used. In each cell, 57 channels (duplex: uplink and downlink) about 800 channels total (across the entire AMPS system 10-20 km 100 cells (1982) AMPS is an analog system using FDMA.
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7 Cellular Concepts Geographical separation Capacity (frequency) reuse Backbone connectivity BS BS BS BS BS BS Publ. Swit. Tel. Net. MTSO (Mobile Telephone Switching office)- MSC (Mobile Switching Center). Hand-held telephone 0.6 watts ; Car transmitters are 3 watts, Maximum. by the FCC. The base station consists of a computers and transmitter/receiver connected to an antenna.
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8 Cellular system MSO, the nerve center of the system
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9 Packet Switching Telephone Network (PSTN) ; Concepts If MS leave a cell, its BS asks the surrounding BS how much power they are getting from it. The BS then transfers ownership to the cell getting the strongest BS MS Nerve center of the system
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10 Handoff (Cellular Concepts) Handoff : Transfer of a MS from one cell to another (300 msec.) Each BS constantly monitors the received power from each MS .
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4a_Cell_ - 4 a The Mobile Telephone System Cell Networks 1...

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