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GSM

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

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  1. GSM Global System For Mobile Communication

  2. Group Members MustanserIqbal (048) Muhammad Noman (059) FA10-BS(CS)

  3. 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.

  4. GSM SERVICES

  5. GSM System Architecture PSTN ISDN BSC MS BTS MSC GMSC BTS BSC VLR MS EIR BTS AUC MS HLR

  6. 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)

  7. System ArchitectureMobile Station (MS) The Mobile Station is made up of two entities: • Mobile Equipment (ME) 2. Subscriber Identity Module (SIM)

  8. 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 –

  9. 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)

  10. 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

  11. 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.

  12. 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)

  13. GSM SPECIFICATIONS Access Methods Modulation Transmission Rate GSM Specification Frequency Band Misc Speech Coding Duplex Distance Channel Spacing

  14. 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)

  15. GSM PROTOCOLS MS Protocols The MS to BTS Protocols GSM Protocol MSC Protocols BSC Protocols

  16. GSM IDENTITIES

  17. Outgoing / Incoming Calls Outgoing Incoming

  18. Characteristics of GSM

  19. Advantages of GSM

  20. Future of GSM

  21. Any Question?

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