Mobile Cellular Systems - Alak Roy

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Cellular Implementations (Gs) • 2.5G: Packet switching extensions , 14.4 – 144 kbps – Digital: GSM to GPRS (General Packet Radio Service) – Analog: AMPS to CDPD (Cellular Digital Packet Data) – CDMA2000 1X • 3G: – High speed (384 kbps to 2 Mbps), data and Internet services – IMT-2000 (International Mobile Telecommunications) – CDMA2000 1X EV-DO, EV-DV, 3X, W-CDMA etc. 4
Cellular Implementations(Gs) • 4G: – High speed (20 – 100 Mbps in mobile mode), Conversed data and voice over IP, Seamless and smooth handoff. – OFDM (Orthogonal FDM) and MC-CDMA (Multi Carrier CDMA) – Hybrid Architecture: integration of Wireless LAN (WiFi, Bluetooth) and wide area 5
Page 1 and 2: SLIDE #2.1 Mobile Cellular Systems
Page 3: Cellular Implementations (Gs) • 1
Page 7 and 8: Frequency Division Duplex (FDD) mob
Page 9 and 10: Number of User Channels in AMPS •
Page 11 and 12: Cellular Architecture MSC PSTN MS B
Page 13 and 14: Hexagonal Cells 13
Page 15: Example: K = 7 15
Page 18 and 19: Nyquist Bandwidth (for noiseless ch
Page 20 and 21: Signal-to-Noise Ratio • Ratio of
Page 22 and 23: Example of Nyquist and Shannon Form
Page 24 and 25: 24 HANDOFF IN CELLULAR SYSTEMS
Page 26 and 27: Handoff Decisions • Usually based
Page 28 and 29: Traditional Handoff Algorithms Choo
Page 30 and 31: Example Receiver Threshold 30
Page 32 and 33: Who and When • Who initiates hand
Page 34 and 35: Types of Handoff • Hard handoff -
Page 36 and 37: High priority for Handoff • In no
Page 38 and 39: Queuing Handoff Calls (QHC) • Que
Page 40 and 41: Queuing Handoff Calls • QHC can b
Page 42: Other practical problems with hando

Mobile Cellular Systems - Alak Roy

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