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

Claim 3

Method according to claim 1, wherein the step of preparing comprises: setting up the three-party connection by a mobile telephone exchange (MSC) in the mobile system (GSM), and keeping the three-party connection in a waiting state until the at least one portable terminal (PP) has registered itself with the mobile telecommunication system (GSM) and received an acknowledgement that transfer can take place.

Claim 4

Method according to claim 1, wherein the step of transferring comprises initiating transfer by the at least one portable terminal (PP).

Claim 5

Method according to claim 1, wherein the step of transferring comprises initiating transfer by a fixed station (CFP) of the cordless telecommunication system (DECT).

Claim 6

The method according to claim 1, wherein the step of designating the transfer zone comprises designating the transfer zone in a time-dependent format.

Claim 7

Method according to claim 1, wherein the step of transferring comprises interrupting transferring and disconnecting any three-party connection already prepared when the at least one portable terminal (PP) carries out internal transfer to another call in the cordless telecommunication system (DECT) which does not belong to the transfer zone.

Claim 8

Method according to claim 1, wherein the step of transferring comprises interrupting transferring when the at least one portable terminal receives a negative acknowledgement from the mobile telecommunication system (GSM).

Claim 9

An arrangement for transfer between a cordless telecommunication system (DECT) which includes a number of cells within a relatively small first area and a cellular mobile telecommunication system (GSM) which includes 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, comprising: a central unit (CFP) in the cordless telecommunication system (DECT) including means for designating a transfer zone including cells in the cordless telecommunication system from which transfer is allowed, and means for monitoring the at least one portable terminal (PP) with regard to identity and position, the means for monitoring including means for determining a designated time-of-day at which the at least one portable terminal (PP) has previously transferred a call based on movement of the at least one portable terminal (PP): storage members in the at least one portable terminal (PP) for storing transfer parameters which are transmitted to the at least one portable terminal when the at least one portable terminal is located in the transfer zone; means, in the mobile telecommunication system (GSM), for setting up in advance a three-party connection, at approximately the designated time-of-day 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, and means, in the at least one portable terminal (PP), for disconnecting from the cordless telecommunication system (DECT) and transferring communication to the mobile telecommunication system (GSM).

Claim 10

An arrangement for transfer between a cordless telecommunication system (DECT) which includes a number of cells within a relatively small first area and a cellular mobile telecommunication system (GSM) which includes 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, comprising: a central unit (CFP) in the cordless telecommunication system (DECT) including means for designating a transfer zone including cells in the cordless telecommunication system from which transfer is allowed, and means for monitoring the at least one portable terminal (PP) with regard to identity and position, the means for monitoring including means for determining a designated time-of-day at which the at least one portable terminal (PP) has previously transferred a call based on movement of the at least one portable terminal (PP): storage members in the at least one portable terminal (PP) for storing transfer parameters which are transmitted to the at least one portable terminal when the at least one portable terminal is located in the transfer zone; means, in the mobile telecommunication system (GSM), for setting up in advance a three-party connection, at approximately the designated time-of-day 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, and means, in the at least one portable terminal (PP), for disconnecting from the cordless telecommunication system (DECT) and transferring communication to the mobile telecommunication system (GSM).

Claim 11

Arrangement according to claim 8, wherein the storage members comprise respective active cards (DAM).

Claim 12

Arrangement according to claim 8, wherein the means for setting up comprises a mobile telephone exchange (MSC) including a number which sets up the three-party connection.