40215 «GSM RAN signaling»

Course Code




The course describes the signaling protocols between nodes within GSM Radio Access Network (RAN). You learn about the overall function of signaling in the Base Station System part of GSM and basic additional information about signaling in the Switching System part of GSM. This includes how to understand the relationships about the terms Mobility Management (MM), Connection Management (CM), Radio Resource Management (RR), the protocols structure in GPRS and the protocols that are responsible for carrying information between the nodes in the GSM network.


Learning objectives

On completion of this course the participants will be able to:

  • List the nodes in the GSM system and the protocols used in GSM.
  • Explain Channel Concept, and analyze the contents of control channels.
  • Understand the mapping of the logical channels in the Multi-Frame structure.
  • Calculate the paging group of the mobile.
  • Define the Time Slot Power Savings feature
  • Differentiate signaling during different types of location updating and when location updating is performed in the system.
  • List nodes involved in setting up mobile originating calls
  • Define the nodes involved in setting up mobile terminating calls
  • Demonstrate signaling during handover
  • Identify nodes involved in the transfer of mobile originating short messages
  • Explain the nodes involved in the transfer of mobile terminating short messages
  • Explain System Information messages and how they are transmitted to the mobile
  • List the contents and the different system information messages
  • Identify the general format of layer 3 messages on the radio and the message format in the air interface.
  • Identify when messages of different groups: MM, RR and CM, are used
  • Define the format of the data link layer protocol (LAPDm) messages used on the Um interface
  • Explain how the layer 1 functions on the radio are implemented
  • Describe the contents of the control channels like SCH, RACH and FCCH
  • List the activities performed by MS:
  • In idle mode - cell selection and reselection
  • In active mode - providing measurement report
  • Show the contents of the measurement report
  • Discriminate how the information carried between the BSC and the BTS is mapped onto the time slots of the PCM lines between them
  • Explain the AMR and DTX functions
  • Describe the general format of the layer 2 protocol (LAPD) messages used on the A-bis interface
  • Identify the ABIS over IP Structure
  • Explain briefly about Signaling System No.7 - SS7
  • Recognize when the BSSAP protocol (MSC-BSC) is used on the A interface
  • Explain about the Call Set-up and Location Updating
  • Explain about IMSI attach and Location Update
  • Identify the GPRS Network structure
  • List the Protocols used in GPRS
  • Explain NACC


Target audience

This course is useful to operators or vendors staff with a background in the telecom or datacom area.

The target audience for this course is: Service Planning Engineers, Service Design Engineers, Network Design Engineers, Network Deployment Engineers, Service Deployment Engineers, System Technicians, Service Technicians



Successful completion of the following course:

GSM Basics

Alternatively the participants should be familiar with GSM network and wireless networks  


Duration and class size

The recommended length of the course is 5 days depending on the participants’ background. The maximum number of participants is 16


Learning situation

This course is based on theoretical instructor-led lessons given in a classroom environment.