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Have you ever wondered how your
cellular provider is able to route calls to you virtually anywhere? How does
the cellular provider know where you are?
The short answer to these questions is that your cell phone
keeps the cellular operator informed about your location.
In this sequence diagram we will examine how a mobile phones
keep selecting the best cell to service your call and also keeps the
cellular provider informed about your location.
We will be tracing the journey of a mobile phone from Rockville, Maryland to
Vienna, Virginia. The path taken by the mobile phone is described in the
GSM Network
Example.
 The
following diagrams describe the GSM location update at different levels of
abstraction. Click on the images to open the PDF diagrams.
The diagrams were generated with
EventStudio System Designer 4.0. The source
FDLs for the diagrams can be downloaded by clicking the button on the
right.
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