GSM and GPRS Call Flows
The call flow diagrams were generated using EventStudio System Designer.
GSM Circuit Switched Call Flows
GSM Network Example
This example shows a few cells in a GSM network. We will be referring to this diagram in several sequence diagrams and call flows.
GSM Mobile Originated Call Flow - Explore More
GSM call setup is analyzed in detail. The role of each participant is documented with a separate call flow.
GSM Location Update - Explore More
GSM Location Update analyzed in detail. The role of each participant is documented with a separate sequence diagram.
GSM Mobile Terminated Call Flow
In this call flow we will look at how a terminating call is handled in GSM. Setting up a terminating call is a two step process. (1) Interrogation procedure to locate the subscriber (2) Actual call setup after the subscriber has been located.
GSM Mobile Originated SMS Session
This scenario describes the session setup for a GSM originating SMS. This sequence diagram describes the SMS signaling and data transfer between the mobile subscriber and the SMS service center.
GSM Handover Call Flows
GSM Handover Call Flow (Intra MSC)
This call flow covers a simple case of call handover in GSM. Here a user has an active call and is moving from the Rockville Cell to the Bethesda Cell.
GSM Inter-MSC Handover Call Flow
This call flow describes the handover between two cells handled by different MSCs.
GSM GPRS Sequence Diagrams
GPRS Combined Attach and PDP Context Activation
The combined attach and PDP context activation of a Class B GPRS terminal will be covered here.
New SGSN Interfaces Attach and Activation
Sequence diagram listing all the interactions involving the new SGSN.