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Method and arrangement for transfer between a cordless telecommunication system and a cellular mobile telecommunication system

  • US 5,873,033 A
  • Filed: 02/06/1996
  • Issued: 02/16/1999
  • Est. Priority Date: 02/06/1995
  • Status: Expired due to Term
First Claim
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1. A method of transfer between a cordless telecommunication system (DECT) including a number of cells within a relatively small first area and a cellular mobile telecommunication system (GSM) including a number of cells within a relatively larger second area which completely or partly overlaps the first area of the cordless telecommunication system (DECT), and including at least one portable terminal (PP) capable of communicating with the cordless and cellular communication systems, the method comprising the steps of:

  • designating a transfer zone for the cordless telecommunication system (DECT), monitoring the at least one portable terminal (PP) with regard to identity and position, determining a designated time-of-day at which the at least one portable terminal (PP) has previously transferred a call due to movement of the at least one portable terminal (PP);

    transmitting transfer parameters to the at least one portable terminal (PP), when the at least one portable terminal (PP) is located in the transfer zone, preparing a transfer in advance by setting up at approximately the designated time-of-day a three-party connection between the at least one portable terminal (PP) and the cordless telecommunication system (DECT) and between the at least one portable terminal (PP) and the mobile telecommunication system (GSM) based on the position of the at least one portable terminal (PP) when the at least one portable terminal (PP) previously transferred a call due to movement;

    disconnecting the at least one portable terminal (PP) from a connection to the cordless telecommunication system (DECT), andtransferring communication to between the at least one portable terminal (PP) and the mobile telecommunication system (GSM).

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