Signaling and Protocol Analysis in GSM

Course Duration: 2 days (appr. 16 hours)

Content Description:


First Day

 

The Basics

  • Introduction to GSM / The Cellular Network Approach / Architecture of BSS and NSS / The GSM Family
  • The GSM Air-Interface / Logical Channels ó Physical Channels / Frame Structure
  • The GSM Terrestrial Interfaces / Abis-, A- / Ater-, B-, C-, D-, E-, F-, G-Interfaces
  • The OSI Reference Model / General Concept / The 7 Layers / Protocol Stacks / Primitives / Peer-to-Peer Communication / Embedding / HDLC
  • Outband ó Inband Signaling / The Concept of Dedicated Signaling Links

 

2 hours

 

The Abis-Interface

  • The Protocol Stack on the Abis-Interface
  • Layer 2 è The LAPD-Protocol / Frame Structure / Adaptations from ISDN / Parameters / Q.930 + Q.931
  • Layer 3 è GSM 08.58 / GSM 08.59 / OML ó RSL ó TCH / transparent vs. Non-transparent / Signaling on the RSL
  • TRAU-Frame / Inband Signaling
  • Typical Error Indications / Error Messages

 

2.5 hours

 

The SS7-Protocol Stack

  • MTP 1 - 3 / FISU / LSSU / MSU / Message Structure and Format / Addressing (OPC + DPC) Automatic Network Management / Error Recognition and Correction
  • SCCP / Message Structure and Format / connection-oriented ó connection-less / SLR + DLR / Global Title
  • TCAP + MAP / Message Structure and Format / GSM Specifics / ASN.1 / PDU communication
  • The ITU-T Specifications (Q.700 – Q.704 / Q.711 – Q.714 / Q.771 – Q.773) / Where can I find …? / How to … ?

 

3.5 hours


Second Day

 

The Air-Interface

  • The Protocol Stack on the Air-Interface
  • Layer 2 è The LAPDm-Protocol / Message Formats / LAPD ó LAPDm / A, B and Bbis-Format / Channel Types (e.g. SACCH / FACCH)
  • Layer 3 è GSM 04.08 / PD / TI / SI / SSN / Message Formats / Messages for RR, MM and CC / Manual Decoding Exercises (Sample Messages and Parameters)
  • Typical Error Indications / Error Messages

 

2.5 hours

 

The A-Interface

  • The Protocol Stack on the A-Interface
  • BSSMAP and DTAP / Message Structure and Format
  • Layer 3 è GSM 08.08 / Is it Layer 3 or 4 ? / Message Formats / Manual Decoding Exercises (Sample Messages and Parameters)
  • Typical Error Indications / Error Messages

 

2 hours

 

Selected Scenarios (Theory)

  • The Mobile Terminating Call Scenario (within the BSS / within the NSS)
  • The Inter-MSC-Handover Scenario (within the BSS / within the NSS)

 

1 hour

 

Selected Scenarios (Real Life Traces)

  • Changing Tracefiles

 

2 hours


Comprehension Test

0.5 hours