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GSM Air Interface (1 days or 6 hours)

Following on from the Engineering the Mobile Network course, this course focuses on the 2G radio interface and in so doing discusses in detail the physical layer, frame formats, protocols etc prior to explaining the mechanisms which are employed as a mobile enters the network and makes and receives calls and text messages. Finally, the course explains the cell selection and re-selection procedures in addition to describing the various types of handovers and interworking with UMTS.

Who Should Attend

This course is designed for network engineers and radio planners requiring a detailed understanding of the GSM air interface or technical managers involved in the development and operation of the GSM radio network.

Course Outline

Divided into 6 sections, the topics covered will include:

Section 1: Introducing the GSM Air Interface (1 hour)

  • Frequency Allocations around the World - GSM, E-GSM, GSM-R.
  • Frequency Reuse and Cell Planning Issues.
  • Modulation Techniques - GMSK and 8PSK.
  • TDMA - Frames, Multiframes and Superframes.
  • Burst Formats - Frequency Correction, Synchronization, Access, Normal (GMSK / 8PSK) and Dummy.

Section 2: The Air Interface Protocols (1 hour)

  • Air Interface Signalling - Dedicated and Common Channel.
  • Layer 2 Protocols - LAPDm, Type A, B, Bbis and C.
  • Link Layer Procedures - Frame Formats, SAPIs and SMS support.
  • Layer 3 Protocols - RR and DTAP.
  • RR and DTAP - Operation and Messages.
  • Analysis of real network traces using mpirical’s drive test tool.

Section 3: The Mobile Station (1 hour)

  • Multimode Handsets and Service Support.
  • Handset Capabilities - Radio Access, Power Class, Multislot Class and HSCSD.
  • Codecs - ACELP, VSELP and M-ACELP (AMR).
  • Coding and Interleaving.

Section 4: Network Entry Procedures (1 hour)

  • Power On - Frequency and Time Synchronization.
  • GSM System Information Message Analysis.
  • Cell Selection - C1 Parameters.
  • IMSI Attach.
  • Analysis of real network traces using mpirical’s drive test tool.

Section 5: Dedicated Mode Procedures (1 hour)

  • Mobile Originated and Terminated Call Setup - detailed analysis of signalling over the air interface.
  • Measurement Reports, Power Control and Timing Advance.
  • Channel Optimization - Frequency Hopping and DTX.
  • Supplementary Services - Procedures for Call Related and Call Independent.
  • SMS Transfer and SMS Protocols - SM-CP, SM-RP and SM-TP.

Section 6: Mobility (1 hour)

  • Mobility in Idle Mode - Cell Re-selection and C2 parameters and Location Updates.
  • Mobility in Dedicated Mode - Handovers, Handover Triggers and Thresholds.
  • Handover Types - Non-synchronized, Pseudo-synchronized, Finely-synchronized and Pre-synchronized.
  • GSM Handover Procedures.
  • Interworking with UMTS - Handovers and Relocations.

For more information: tel +44 (0) 1344 724666 or email enquiries@mpirical.com

 
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