Routing a data signal to a mobile station within a telecommunications network

• US 5,878,347 A
• Filed: 06/03/1996
• Issued: 03/02/1999
• Est. Priority Date: 03/26/1996
• Status: Expired due to Term

• Current Assignee: Ericsson, Inc. (Telefonaktiebolaget LM Ericsson)
• Original Assignee: Ericsson, Inc. (Telefonaktiebolaget LM Ericsson)
• Inventors: Joensuu, Erkki, Patel, Mahesh
• Primary Examiner(s): Urban, Edward F.
• Assistant Examiner(s): Gesesse, Tilahun
• Application Number:
  US08/655,088
• Time in Patent Office: 1,002 Days
• Field of Search: 455/433, 455/33.1, 455/432, 455/445, 455/466, 379/59, 379/58, 370/401
• US Class Current: 455/433
• CPC Class Codes: H04Q 2213/13097 Numbering, addressing
• CPC Class Codes: H04Q 2213/13098 Mobile subscriber
• CPC Class Codes: H04Q 2213/13102 Common translator
• CPC Class Codes: H04Q 2213/13103 Memory
• CPC Class Codes: H04Q 2213/13141 Hunting for free outlet, circuit or channel
• CPC Class Codes: H04Q 2213/13209 ISDN
• CPC Class Codes: H04Q 2213/13216 Code signals, frame structure
• CPC Class Codes: H04Q 2213/13336 Store & forward, messaging systems
• CPC Class Codes: H04Q 2213/13345 Intelligent networks, SCP
• CPC Class Codes: H04Q 2213/13353 Routing table, map memory
• CPC Class Codes: H04Q 2213/13532 mobile networks
• CPC Class Codes: H04Q 3/005 Personal communication services, e.g. provisions for portability of subscriber numbers
• CPC Class Codes: H04W 8/10 between location register and external networks
• CPC Class Codes: H04W 8/28 Number portability ; Network address portability

Abstract

Incoming calls or messages for a mobile station that has been ported from a first HLR to a second HLR are first received by a gateway node. The gateway node, in turn, transmits a signal requesting routing instruction to a centralized database connected to a gateway node. Utilizing the received Mobile Station Integrated Services Digital Network (MSISDN) number, the centralized database determines the network address of the new HLR currently serving the ported mobile station. The received signal requesting routing information is then routed to the new HLR. The new HLR retrieves the requested information and transmits it back to the gateway node. The gateway node, utilizing the received routing information received from the new HLR, accordingly routes the incoming calls or messages to the ported mobile station.

Claims

1. A method for retrieving subscriber information associated with a mobile station, said mobile station being ported from an original home location register (HLR) to a particular HLR, said particular HLR storing said subscriber information associated with said mobile station, said method comprising the steps of:

responsive to an incoming signal, transmitting a first signal identifying a mobile station identification number from a gateway node to a centralized database, said first signal requesting said subscriber information;

determining, by said centralized database, a network address representing said particular HLR by indexing on said mobile station identification number;

rerouting said first signal from said centralized database to said particular HLR using said determined network address;

retrieving said subscriber information in response to a reception of said first signal by said particular HLR; and

transmitting a second signal from said particular HLR to said gateway node, said second signal including said retrieved subscriber information, and said second signal being addressed to said gateway node.

2. The method of claim 1 wherein said mobile station identification number comprises a Mobile Station Integrated Services Digital Network (MSISDN) number.

3. The method of claim 1 wherein said incoming signal comprises a Short Message Service (SMS) data signal.

4. The method of claim 3 wherein said gateway node comprises a Short Message System--Gateway Mobile Switching Center (SMS-GMSC) node.

5. The method of claim 4 wherein said incoming signal includes a translation type (TT) value, and wherein said step of transmitting said first signal to said centralized database further comprises the steps of:

testing for whether said TT value equals ten; and

transmitting said first signal if said TT value equals ten (10).

6. The method of claim 1 wherein said subscriber information comprises a network address representing a Mobile Switching Center (MSC) currently serving said mobile station.

7. The method of claim 1 wherein said incoming signal comprises an incoming voice call.

8. The method of claim 7 wherein said gateway node comprises a Gateway Mobile Switching Center (GMSC) for routing said incoming voice call.

9. A system for routing an incoming signal to a mobile station, said mobile station being ported from an original home location register (HLR) to a particular HLR, said particular HLR storing subscriber information associated with said mobile station, said system comprising:

a mobile switching center (MSC) serving said mobile station, said particular HLR storing said subscriber information identifying said MSC;

a gateway node for receiving said incoming signal and transmitting a first signal requesting said subscriber information;

a centralized database for receiving said first signal and determining a network address of said particular HLR and rerouting said first signal using said network address from said centralized database to said particular HLR;

wherein said particular HLR retrieves said subscriber information and transmits a second signal including said subscriber information to said gateway node, said second signal being addressed to said gateway node; and

wherein said gateway node responds to said network information received in said second signal by routing said incoming signal to said MSC as indicated by said subscriber information.

10. The system of claim 9 wherein said gateway node comprises a Short Message Service--Gateway Mobile Switching Center (SMS-GMSC) node.

11. The system of claim 10 wherein said first signal to said centralized database is transmitted only if said incoming signal comprises a Title Translation (TT) value of ten (10).

12. The system of claim 9 wherein said first signal comprises a Mobile Application Part (MAP) signal communicated over a Signaling System No. 7 (SS7).

13. The system of claim 9 wherein said centralized database stores:

a first record containing an identification number for said mobile station;

a second record containing said network address representing said particular HLR; and

correlation data for correlating said first record with said second record.

14. The system of claim 13 wherein said network address comprises a Global Title (GT) translation address.

15. The system of claim 13 wherein said network address comprises a Destination Point Code (DPC) and a Subsystem Number (SSN).

16. The system of claim 9 wherein said first signal includes a Mobile Station Integrated Service Digital Network (MSISDN) number.

17. The system of claim 9 wherein said gateway node comprises a Gateway Mobile Switching Center (GMSC) node for handling incoming voice calls.

18. The system of claim 9 wherein said centralized database comprises a virtual home location register (VHLR).

19. A system for retrieving subscriber information associated with a mobile station, said mobile station being ported from an original home location register to a particular home location register (HLR), said particular HLR storing said subscriber information associated with said mobile station, said system comprising:

responsive to an incoming signal, means for transmitting a first signal identifying a mobile station identification number from a gateway node to a centralized database, said first signal requesting said subscriber information;

means for determining, by said centralized database, a network address representing said particular HLR using said mobile station identification number;

means for rerouting said first signal from said centralized database to said particular HLR using said determined network address;

means for retrieving said subscriber information in response to a reception of said first signal by said particular HLR; and

means for transmitting a second signal from said particular HLR to said gateway node, said second signal including said retrieved subscriber information, and said second signal being addressed to said gateway node.

20. The system of claim 19 wherein said mobile station identification number comprises a Mobile Station Integrated Services Digital Network (MSISDN) number.

21. The system of claim 19 wherein said gateway node comprises a Short Message System--Gateway Mobile Switching Center (SMS-GMSC) node.

22. The system of claim 19 wherein said gateway node comprises a Gateway Mobile Switching Center (GMSC) for routing said incoming signal.

23. A method for retrieving subscriber information associated with a mobile station, said mobile station being ported from an original home location register (HLR) to a particular HLR, said particular HLR storing said subscriber information associated with said mobile station, said method comprising the steps of:

responsive to an incoming signal, transmitting a first signal identifying a mobile station identification number from a gateway node to a centralized database, said first signal requesting said subscriber information, and said first signal having an originating address comprising an address for said gateway node and a destination address comprising an address for said centralized database;

determining, by said centralized database, a network address representing said particular HLR by indexing on said mobile station identification number;

forwarding said first signal from said centralized database to said particular HLR by replacing in said destination address of said first signal said network address of said particular HLR and maintaining said address for said gateway node as said originating address;

retrieving said subscriber information from said particular HLR; and

transmitting a second signal from said particular HLR to said gateway node, said second signal including said retrieved subscriber information, and said second signal having an originating address comprising said network address of said particular HLR and a destination address comprising said address of said gateway node as extracted from said originating address of said first signal.

24. The method of claim 23 wherein said mobile station identification number comprises a Mobile Station Integrated Services Digital Network (MSISDN) number.

25. The method of claim 23, wherein said incoming signal comprises a Short Message Service (SMS) data signal.

26. The method of claim 25 wherein said gateway node comprises a Short Message Service--Gateway Mobile Switching Center (SMS-GMSC) node.

27. The method of claim 26 wherein said incoming signal includes a translation type (TT) value, and wherein said step of transmitting said first signal to said centralized database further comprises the steps of:

testing for whether said TT value equals ten; and

transmitting said first signal if said TT value equals ten (10).

28. The method of claim 23 wherein said subscriber information comprises a network address representing a Mobile Switching Center (MSC) currently serving said mobile station.

29. The method of claim 23 wherein said incoming signal comprises an incoming voice call.

30. The method of claim 29 wherein said gateway node comprises a Gateway Mobile Switching Center (GMSC) for routing said incoming voice call.

31. A system for routing an incoming signal to a mobile station, said mobile station being ported from an original home location register (HLR) to a particular HLR, said particular HLR storing subscriber information associated with said mobile station, said system comprising:

a mobile switching center (MSC) serving said mobile station, said particular HLR storing said subscriber information identifying said MSC;

a gateway node for receiving said incoming signal and transmitting a first signal requesting said subscriber information;

a centralized database for receiving said first signal and determining a network address of said particular HLR and forwarding said first signal using said network address from said centralized database to said particular HLR;

wherein said first signal has an originating address comprising an address for said gateway node and a destination address comprising an address for said centralized database;

wherein said centralized database forwards said first signal to said particular HLR by replacing in said destination address of said first signal said network address of said particular HLR and maintaining said address for said gateway node as said originating address;

wherein said particular HLR retrieves said subscriber information and transmits a second signal including said subscriber information to said gateway node, said second signal having an originating address comprising said network address of said particular HLR and a destination address comprising said address of said gateway node as extracted from said originating address of said first signal; and

wherein said gateway node responds to said subscriber information received in said second signal by routing said incoming signal to said MSC as indicated by said subscriber information.

32. The system of claim 31 wherein said incoming signal comprises a Short Message Service (SMS) data signal.

33. The system of claim 32 wherein said gateway node comprises a Short Message Service--Gateway Mobile Switching Center (SMS-GMSC) node.

34. The system of claim 33 wherein said first signal to said centralized database is transmitted only if said incoming signal comprises a Title Translation (TT) value of ten (10).

35. The system of claim 31 wherein said first signal comprises a Mobile Application Part (MAP) signal communicated over a Signaling System No. 7 (SS7).

36. The system of claim 31 wherein said centralized database stores:

a first record containing an identification number for said mobile station;

a second record containing said network address representing said particular HLR; and

correlation data for correlating said first record with said second record.

37. The system of claim 31 wherein said first signal includes a Mobile Station Integrated Service Digital Network (MSISDN) number.

38. The system of claim 31 wherein said gateway node comprises a Gateway Mobile Switching Center (GMSC) for handling incoming voice calls.

39. The system of claim 31 wherein said centralized database comprises a virtual home location register (VHLR).