GSM and GPRS System Engineering

GSM and GPRS remain the foundation technologies for many mobile networks worldwide, offering voice and data services through globally standardized network infrastructures. This course explores the network architecture for both circuit and packet switched services, detailing the air interface and the initial procedures required for network access. Network usage is also explained, showing how calls, texts and data sessions are established and maintained as the subscriber moves around the network.
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Section 1 - GSM and GPRS Architecture
Section 2 - GSM and GPRS Air Interface
Section 3 - GSM and GPRS Initial Procedures
Section 4 - GSM and GPRS Security
Section 5 - GSM Circuit Switched Operation
Section 6 - GPRS Packet Switched Operation
Section 7 - GSM and GPRS Mobility

Topic areas covered include:

  • The 3GPP Network Architecture:
  • Terminal Equipment:
      • MS, ME, SIM.
    • The GSM EDGE Radio Access Network:
      • BTS, BSC, PCU.
    • The Core Network – Circuit Switched:
      • MSC, GMSC, VLR, Echo Cancellers, TRAU.
    • The Core Network – Packet Switched:
      • SGSN, GGSN.
    • Databases:
      • HLR, AuC, EIR.
    • Intelligent Networks and CAMEL:
      • gsmSCF, gsmSRF, gsmSSF, gprsSSF.
  • Protocols and Interfaces:
    • Circuit Switched Control Plane:
      • RR, DTAP, BSSAP, BSSMAP, SCCP, MAP, CAP, INAP.
    • Packet Switched Control Plane:
      • MAC, RLC, LLC, SNDCP, BSSGP, NS, GTP, MAP.

Topic areas covered include:

  • Frequency Allocation:
    • GSM900, GSM1800, GSM1900, GSM850.
  • Frequency Reuse:
    • Cell Sectorization.
  • Air Interface Physical Layer:
    • Modulation Techniques.
    • Time Division Multiple Access:
      • Radio, Physical and Logical Channels.
    • 26 Frame Multiframe:
      • TCH, SACCH, FACCH, Half Rate Channels.
    • 51 Frame Multiframe:
      • FCCH, SCH, BCCH, AGCH, PCH, RACH.
    • 102 Frame Multiframe:
      • SDCCH.
    • Base Site Configuration.

Topic areas covered include:

  • Mobility Management:
    • Location Areas and Routing Areas.
    • GSM Mobility Management States:
      • Off, Dedicated, Idle.
    • GPRS Mobility Management States:
      • Idle, Ready, Standby.
  • Initial Procedures:
    • Power On:
      • Frequency Synchronization, Time Synchronization, System Information.
    • Cell Selection:
      • C1 Calculation.
    • Circuit Switched Attach (IMSI Attach):
      • MSC Pooling.
    • Packet Switched Attach:
      • SGSN Pooling.
      • Combined Attach.
    • Cell Re-selection:
      • C2 Calculation.
    • Location Area and Routing Area Updates.
    • A Flex:
      • Pool Areas, NRI, Load Balancing, Load Redistribution.

Topic areas covered include:

  • Authentication:
    • GSM Authentication Procedure.
    • GPRS Authentication Procedure.
  • Encryption:
    • GSM Encryption Process.
    • GPRS Encryption Process.

Topic areas covered include:

  • Mobile Originated Call Setup Procedure:
    • Core Network Signalling – ISUP.
    • Core Network Signalling – BICC.
    • Disconnect.
  • Mobile Terminated Call Setup Procedure:
    • Roaming.
  • Codecs:
    • PCM, EFR, HR, AMR.
  • Text Messaging:
    • Mobile Originated Text Messaging
    • Mobile Terminated Text Messaging.
    • Text Messaging Failures.

Topic areas covered include:

  • Session Management:
  • PDP Context Activation Procedure:
    • BSS Packet Flow Context.
    • Secondary PDP Context Activation:
      • Traffic Flow Templates, Packet Filters.
  • 2G Data Transfer:
    • Medium Access:
      • Dynamic Allocation, Extended Dynamic Allocation, Exclusive Allocation.
    • Uplink Data Transfer.
    • Downlink Data Transfer.
  • 2G Modes of Operation:
    • Class A, Class B and Class C.
    • Dual Transfer Mode.
    • Suspend and Resume.

Topic areas covered include:

  • GSM Mobility:
    • GSM Measurement Reports.
    • Handover Triggers:
      • Thresholds and P/N Values.
      • Handover Margins.
    • Types of Handover:
      • Non Synchronized.
      • Pseudo Synchronized.
      • Finely Synchronized.
      • Pre Synchronized.
  • GPRS Mobility:
    • Network Control:
      • NC0, NC1, NC2.
    • Cell Update Procedure.
    • Routing Area Update Procedure.

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