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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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Presentation Transcript
slide1

GSM

Global System For Mobile Communication

slide2

Group Members

MustanserIqbal (048)

Muhammad Noman (059)

FA10-BS(CS)

slide3

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.

slide5

GSM System Architecture

PSTN

ISDN

BSC

MS

BTS

MSC

GMSC

BTS

BSC

VLR

MS

EIR

BTS

AUC

MS

HLR

slide6

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)

slide13

GSM SPECIFICATIONS

Access Methods

Modulation

Transmission Rate

GSM

Specification

Frequency Band

Misc

Speech Coding

Duplex Distance

Channel Spacing

slide14

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)

slide15

GSM PROTOCOLS

MS Protocols

The MS to BTS Protocols

GSM Protocol

MSC Protocols

BSC Protocols

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