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GSM Inter MSC Handover Call Flow

Handing over a GSM call is a complicated procedure. It is even more so when the source and target GSM cells are controlled by different MSCs. The following call flows analyze the different steps involved in a inter-MSC handover:

  • The source BSC analyzes the signal quality measurement reports and initiates a handover.
  • The source MSC finds that the call needs to be handed over to a cell controlled by a different MSC.
  • The source MSC and target MSC interact and then command the UT to move to the new cell.
  • The target MSC informs the source MSC when the call has been successfully handed over.
  • The source MSC releases the radio resources for the call. Note that the call is still routed via the source MSC.