Intelligent call routing in telecommunication network with dual mode terminals

• US 6,181,938 B1
• Filed: 12/09/1998
• Issued: 01/30/2001
• Est. Priority Date: 06/07/1996
• Status: Expired due to Fees

• Current Assignee: Nokia Telecommunications Oy (Nokia Corporation)
• Original Assignee: Kolster Oy Ab
• Inventors: Tuohino, Markku, Salmela, Seija
• Primary Examiner(s): LE, THANH C
• Application Number:
  US09/202,075
• Time in Patent Office: 783 Days
• Field of Search: 455/432, 455/433, 455/434, 455/435, 455/436, 455/445, 455/450, 455/452, 455/455, 455/458
• US Class Current: 455/433
• CPC Class Codes: H04W 8/12 between location registers or mobility servers

Abstract

A dual mode (GSM/DECT) terminal requires new qualities of a mobile telephone network. The dual mode (or multimode) DMT terminal has one primary subscriber number, either DDI number, a MSISDN number or a so called personal number especially served for this service. In calling the DMT subscriber, the primary number is used regardless of whether the subscriber is in an exchanged area or in the mobile telephone network. The intelligent network technology takes care of locating updating. The subscriber location is checked in the service control point of the intelligent network. The call terminal at the DMT subscriber is routed to the address given by the intelligent network.

Claims

1. A method for performing location updating of a dual or multi mode terminal (DMT) in the telecommunication network, which comprises:

a first type switched telephone network (PSTN), comprising at least one first switching system (LE);

a second type mobile telephone network (GSM PLMN) supporting extensive subscriber mobility, comprising at least one second switching system (MSC);

a third type telecommunication network (PISN) supporting limited subscriber mobility, comprising at least one third switching system (G-PABX); and

in which telecommunication network a service switching point (SSP) of the intelligent network is arranged in connection with the second switching system (MSC) or the subscriber location register (VLR/HLR) connected to that or in connection with the first and second switching systems (LE, MSC), from which service switching point (SSP) a connection is arranged to the service control point (SCP) of the intelligent network;

characterized in that the mobile terminal (DMT) in connection with location updating;

if the second switching system (MSC) receives a location update message from the mobile terminal (DMT) the second switching system (MSC), or the subscriber location register (VLR/HLR) connected to it, transmits a service request to the service switching point (SSP) of the intelligent network, from where it is transmitted further to the service control point (SCP), said service request including an identifier and/or a number of the mobile terminal (DMT);

if the third switching system (G-PABX) receives a location update message from the mobile terminal (DMT) it transmits the location update message to the first or second switching system (LE, MSC) which in its turn transmits a service request to the service switching point (SSP) of the intelligent network, from where it is transmitted further to the service control point (SCP), said service request including information about the location update;

the identifier and/or number of the mobile terminal (DMT) and the routing address to the third switching system (G-PABX);

in response to the service request the switching node (SCP) of the intelligent network stores the routing information concerning the location of the mobile terminal (DMT) indicated in the service request.

2. A method as claimed in claim 1, characterized in that in connection with a call terminating at a mobile terminal (DMT):

the first or second switching system (LE, MSC), which receives a call set-up request, transmits an inquiry concerning the location of the mobile terminal (DMT) to the switching node (SCP) of the intelligent network;

the switching node (SCP) of the intelligent network fetches from its memory the routing information corresponding to the primary number of the mobile terminal (DMT) and transmits it to the switching system (LE, MSC) that received the call set-up request,

if the routing information indicates that the mobile terminal (DMT) is in the area of a telephone network GSM PLMN) of the second type, the call is set up like a normal mobile-terminating call; and

if the routing information indicates that the mobile terminal (DMT) is in the area of a telecommunication network of the third type (PISN), the call is set up according to the normal protocol in a telecommunication network of the third type.

3. A method as claimed in claim 2, characterized in that a primary number has been assigned to the mobile terminal (DMT) that is valid both in the area of a telephone network of the second type (GSM PLMN) and in the area of a telecommunication network of the third type (PISN).

4. A method as claimed in claim 3, characterized in that the primary number either is a DDI number, a MSISDN number or a number especially reserved for this service, a so called personal number.

5. A method as claimed in claim 1, characterized in that the telephone network of the second type is a digital mobile telephone network like GSM/DCS.

6. A method as claimed in claim 1, characterized in that a cordless radio connection like the DECT system is used in the telecommunication network of the third type.

7. A method as claimed in claim 5 or 6, characterized in that the MSISDN number is used as routing information if the mobile terminal (DMT) is in the area of a telephone network of the second type (GSM PLMN).

8. A method as claimed in claim 5 or 6, characterized in that, while a mobile terminal (DMT) is located in the area of a telecommunication network of the third type (PISN), the routing information comprises the address of the third switching system (G-PABX), which is connected either to the first or second switching system (LE, MSC), and a DDI number which is used for locating the mobile terminal (DMT) in a telecommunication network of the third type (PISN).

9. A method as claimed in claim 5 or 6, characterized in that, while a mobile terminal (DMT) is in the area of a telecommunication network of the third type (PISN), the routing information comprises the address of the third switching system (G-PABX), which is connected either to the first or second switching system (LE, MSC), and a temporary number which is used for locating a mobile terminal (DMT) in a telecommunication network of the third type (PISN) and which number has been reserved for the mobile terminal by the telecommunication network of the third type.

10. A method as claimed in claim 5 or 6, characterized in that the ISDN number is used as routing information if the mobile terminal (DMT) is in the area of a telephone network of the first type (PSTN/ISDN).