Locating the user

If only mobile users originate calls, then it does not matter where the user is!

However, if we want to reach a mobile user, then:

• we can track the user continuously, or

• we can start looking for the user where we last saw them and then expand our search, or

• we can guess where the user might be based on their patterns of movement (past behavior)

• the user tells us where they are

  • based on a schedule the user can tell us where they are(e.g., every one minute tell the system where you are now) or
  • the user can listen for something which causes them to check in (for example we a page)

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