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GSM. Global System For Mobile Communication. Group Members. Mustanser Iqbal ( 048 ) Muhammad Noman (059). FA10-BS(CS). What is GSM ???.

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Gsm

GSM

Global System For Mobile Communication


Gsm

Group Members

MustanserIqbal (048)

Muhammad Noman (059)

FA10-BS(CS)


Gsm

What is GSM ???

Global System for Mobile (GSM) is a second generation cellular standard developed to cater voice services and data delivery using digital modulation.


Gsm

GSM SERVICES


Gsm

GSM System Architecture

PSTN

ISDN

BSC

MS

BTS

MSC

GMSC

BTS

BSC

VLR

MS

EIR

BTS

AUC

MS

HLR


Gsm

GSM System Architecture

  • Mobile Station (MS)

    Mobile Equipment (ME)

    Subscriber Identity Module (SIM)

  • Base Station Subsystem (BSS)

    Base Transceiver Station (BTS)

    Base Station Controller (BSC)

  • Network Switching Subsystem(NSS)

    Mobile Switching Center (MSC)

    Home Location Register (HLR)

    Visitor Location Register (VLR)

    Authentication Center (AUC)

    Equipment Identity Register (EIR)


System architecture mobile station ms

System ArchitectureMobile Station (MS)

The Mobile Station is made up of two entities:

  • Mobile Equipment (ME)

    2.Subscriber Identity Module (SIM)


System architecture mobile station ms1

System ArchitectureMobile Station (MS)

Mobile Equipment

  • Voice and data transmission

  • 160 character long SMS.

  • Uniquely identified by an IMEI (International Mobile Equipment Identity)

    Subscriber Identity Module (SIM)

  • Smart card contains the International Mobile Subscriber Identity (IMSI)

  • Allows user to send and receive calls and receive other subscribed services

  • Protected by a password or PIN

  • Can be moved from phone to phone –


System architecture base station subsystem bss

System ArchitectureBase Station Subsystem (BSS)

Base Station Subsystem is composed of two parts that communicate across the standardized Abis interface allowing operation between components made by different suppliers

  • Base Transceiver Station (BTS)

  • Base Station Controller (BSC)


System architecture base station subsystem bss1

System ArchitectureBase Station Subsystem (BSS)

Base Transceiver Station (BTS):

  • Encodes, encrypts, multiplexes, modulates and feeds the RF signals to the antenna.

  • Frequency hopping

  • Communicates with Mobile station and BSC

  • Consists of Transceivers (TRX) units

    Base Station Controller (BSC):

  • Manages Radio resources for BTS

  • Assigns Frequency and time slots for all MS’s in its area


System architecture network switching subsystem nss

System ArchitectureNetwork Switching Subsystem (NSS)

Mobile Switching Center (MSC)

  • Heart of the network

  • Manages communication between GSM and other networks

  • Call setup function and basic switching

  • Call routing

  • Billing information and collection

  • Mobility management

    - Registration

    - Location Updating

    - Inter BSS and inter MSC call handoff

  • MSC does gateway function while its customer roams to other network by using HLR/VLR.


System architecture network switching subsystem

System ArchitectureNetwork Switching Subsystem

  • Home Location Registers (HLR)

    - permanent database about mobile subscribers in a large service area(generally one per GSM network operator)

  • Visitor Location Registers (VLR)

    • Temporary database which updates whenever new MS enters its area, by HLR database

    • Controls those mobiles roaming in its area

  • Authentication Center (AUC)

    Maintains authentication keys and algorithms and provides security triplets.

  • Equipment Identity Register (EIR)

    - Database that is used to track handsets using the IMEI (International Mobile Equipment Identity)


  • Gsm

    GSM SPECIFICATIONS

    Access Methods

    Modulation

    Transmission Rate

    GSM

    Specification

    Frequency Band

    Misc

    Speech Coding

    Duplex Distance

    Channel Spacing


    Gsm

    Speech

    Speech

    Speech decoding

    Speech coding

    13 Kbps

    Channel Coding

    Channel decoding

    22.8 Kbps

    Interleaving

    De-interleaving

    22.8 Kbps

    Burst Formatting

    Burst Formatting

    33.6 Kbps

    Ciphering

    De-ciphering

    33.6 Kbps

    Radio Interface

    Modulation

    Demodulation

    270.83 Kbps

    GSM Operation

    LPC

    CRC

    min. effect of fades

    FCB

    SB

    DB

    AB

    Security(XOR)


    Gsm

    GSM PROTOCOLS

    MS Protocols

    The MS to BTS Protocols

    GSM Protocol

    MSC Protocols

    BSC Protocols


    Gsm identities

    GSM IDENTITIES


    Gsm

    Outgoing / Incoming Calls

    Outgoing

    Incoming


    Gsm

    Characteristics of GSM


    Gsm

    Advantages of GSM


    Future of gsm

    Future of GSM


    Gsm

    Any Question?


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