GSM Global System for Mobile communication

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Presentation transcript:

GSM Global System for Mobile communication

History GSM Global System for Mobile communication 1982 by ETSI analog => digital solve the compatibility problem released to market in 1991 TDMA、FDMA

Components Mobile Station - SIM、Mobile phone Base Station System - receiver Mobile-service Switching Center - the heart of the network

Features International Roaming Increase in capacity - frequency hopping Security - frequency hopping、TDMA - SIM (Subscriber Identity Module) Digital Service Communication - mobile data

Telecom & Datacom Circuit switch Packet switch MSC MS1 MS2 Internet PC 3

Basic concept GSM 900/1800 - bandwidth: 890~960MHz/1710~1880MHz - 0.2MHz per frequency carrier - what’s different? 。distance 。power 。number of BS

Basic concept EM spectrum - GSM: 900/1800 MHz - Bluetooth: 2.4 GHz UV Visible IR Fibre communication Satellite Radar UHF Mobile communication AM Radio FM telephony Wave length Frequency 0.47m 0.76m 1cm 10cm 1m 10m 100m 1km 10km 100km 1015Hz 100GHz 1014Hz 10GHz 1GHz 100MHz 10MHz 1MHz 100KHz 10KHz 1KHz GSM. Bluetooth EM spectrum - GSM: 900/1800 MHz - Bluetooth: 2.4 GHz

FDMA Frequency Division Multiple Access Uplink Frequency carrier 0.2MHz ．．．．．． 124 carriers 890MHz 915MHz 935MHz 960MHz Uplink Downlink Guard band Frequency carrier

TDMA Only 124 people can access concurrently?! Time Division Multiple Access - 8 time slots per frequency carrier f time ‧‧‧‧‧ 1 2 3 4

Cellular Telecommunications 124 * 8 = 992 connections are NOT enough! Cell structure 36～53 1～17 18～35

Public telecom network Communication system BS3 BS1 BS2 MSC LSC CSIE CC Mobil telecom network Public telecom network