ACS-2009-05 - Lecture Topics Introduction Architecture...

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1 Lecture Topics: Introduction Architecture & Interfaces OSI of GSM Radio Link Features Logical Channels & Frame Structure Speech Coding Privacy & Security Specification Summary
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2 What is GSM? GSM: Global System for Mobile communications, A mobile radio communication system employing cellular architecture, A communication protocol over radio channel, An interface specification between mobile and base stations (air interface) An interface specification between various network components (base stations, controllers, switches, etc.)
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3 GSM standard: A standard developed by the European Telecommunication Standards Institute (ETSI) ETSI originally defined GSM as a European digital cellular telephony standard The set of GSM interfaces defined by ETSI lay the ground- work for a multivendor network approach to digital mobile communication. GSM offers mobile users good voice quality, call privacy, and network security.
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4 GSM Objectives: To provide the subscribers with a wide range of voice and non-voice services and facilities compatible with those offered by PSTN and ISDN over mobile radio To provide certain services and facilities exclusive to mobile radio situations To give compatibility of access to the GSM network for a mobile subscriber in a country that operates the GSM system (global standard)
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5 GSM Objectives - cont. To provide facilities for automatic roaming, locating, and updating of mobile subscribers To provide services to a wide range of mobile stations, including vehicle mounted stations, portable stations, and handheld stations To provide for the efficient use of the radio frequency spectrum (a precious network resource) To allow for low-cost network infrastructure, mobile radio terminals, and service cost
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6 GSM PLMN Services A telecommunication service supported by the GSM PLMN is defined as a group of communication capabilities that the service provider offers to the subscribers GSM PLMN offers 3 basic telecommunication services: bearer services (up to layer 3 of OSI) Teleservices (voice, data, etc.), and supplementary services Please refer to Reference [1] for a list of services
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7 Bearer Services Support Data services x x Alternate speech/data x x Speech followed by data x x Clear 3.1 kHz audio x x Unrestricted digital information (UDI) x x Packet Assembler/Disassembler (PAD) x 3.1 kHz external to PLMN x Others x Service GSM ISDN
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8 Teleservices Support Circuit speech (telephony) x x Emergency call x x Short message point-to-point x x Short message cell broadcast x x Alternate speech/facsimile group 3 x x Automatic facsimile group 3 x Voice-band modem (3.1 kHz audio) x x Messaging teleservices x Service GSM ISDN Paging teleservices x Others x
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9 Access Techniques
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10 TDMA/FDMA F 1 F’ 1 F 0 Cell Rx Cell Tx F 2 F’ 2 45 MHz Amplitude Frequency Time Time
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11 GSM Multiple-Access Scheme A combination of FDMA and TDMA A total of 124 FDMA channels of 200 kHz bandwidth each.
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