Automatic location identification (ALI) emergency services pseudo key (ESPK)

• US 8,059,789 B2
• Filed: 12/01/2006
• Issued: 11/15/2011
• Est. Priority Date: 02/24/2006
• Status: Expired due to Fees

• Current Assignee: TeleCommunication Systems Inc (Comtech Telecommunications Corporation)
• Original Assignee: TeleCommunication Systems Inc (Comtech Telecommunications Corporation)
• Inventors: Marshall, Roger Stuart, Croy, Jonathan, Hines, John Gordon
• Primary Examiner(s): WOO, STELLA L
• Application Number:
  US11/607,036
• Publication Number:
  US 20070201623A1
• Time in Patent Office: 1,810 Days
• Field of Search: 379/45, 379/37, 455/404.1, 455/404.2
• US Class Current: 379/45
• CPC Class Codes: H04Q 2213/13091 CLI, identification of calling line
• CPC Class Codes: H04Q 2213/13097 Numbering, addressing
• CPC Class Codes: H04Q 2213/1337 Operator, emergency services
• CPC Class Codes: H04Q 2213/13374 Paging
• CPC Class Codes: H04Q 3/72 Finding out and indicating number of calling subscriber

Abstract

ESQK and/or ESRK (ESxK) number pool exhaustion and reuse errors are eliminated by replacing the ESxK identifier with an emergency services pseudo key (ESPK) identifier. A positioning center (MPC/VPC) replaces an ESxK received with a query with a ESPK in a return message. The ESPK is either a unique 10-digit number or unique alpha-numeric identifier that can be used to re-query the source of dynamic ALI data. The ESPK may be generated using, e.g., unique prefixing, suffixing, or randomizing. The ESPK is a non-constrained, unique identifier that preferably remains unique for the call instance over an extended period of time. The ESPK is used for any subsequent ALI request for the call. Each time a positioning center receives a query with ESPK, it is directly associated with, and returns, the updated location for the original emergency call, regardless of whether or not the original ESxK was reallocated to another emergency call.

Claims

1. An emergency services pseudo key replacement module, comprising:

an ESxK receiver to receive a time constrained emergency services key (ESxK);

an ESxK replacement module to replace said time constrained ESxK with an emergency services pseudo key (ESPK) eliminating a time constraint associated with said time constrained ESxK; and

a transmitter to transmit said non-time constrained ESPK to an automatic location identification (ALI) database.

2. The emergency services pseudo key replacement module according to claim 1, further comprising:

an ESPK generator.

3. The emergency services pseudo key replacement module according to claim 2, wherein:

said ESPK generator generates a plurality of ESPKs using unique prefixing.

4. The emergency services pseudo key replacement module according to claim 2, wherein:

said ESPK generator generates a plurality of ESPKs using unique suffixing.

5. The emergency services pseudo key replacement module according to claim 2, wherein:

said ESPK generator generates a plurality of ESPKs using randomizing.

6. The emergency services pseudo key replacement module according to claim 1, wherein:

said ESPK is a 10-digit number.

7. The emergency services pseudo key replacement module according to claim 1, wherein:

said ESPK is an alpha-numeric identifier.

8. The emergency services pseudo key replacement module according to claim 1, wherein:

said ESPK is one of an emergency services query key (ESQK) and emergency services routing key (ESRK).

9. A method of replacing a constrained emergency services key identifier received in a message with a non-constrained emergency services pseudo key identifier, comprising:

receiving a query message identified with a time constrained emergency services key (ESxK);

replacing said time constrained ESxK with an emergency services pseudo key (ESPK) eliminating a time constraint associated with said time constrained ESxK; and

transmitting said non-time constrained ESPK to an automatic location identification (ALI) database.

10. The method of replacing a constrained emergency services key identifier received in a message with a non-constrained emergency services pseudo key identifier according to claim 9, wherein:

said received message is received by a positioning center identified with one of an emergency services query key (ESQK) and an emergency services routing key (ESRK).

11. The method of replacing a constrained emergency services key identifier received in a message with a non-constrained emergency services pseudo key identifier according to claim 10, wherein:

said received message is received over an Internet.

12. The method of replacing a constrained emergency services key identifier received in a message with a non-constrained emergency services pseudo key identifier according to claim 10, wherein:

said positioning center is a mobile positioning center in a cellular network.

13. The method of replacing a constrained emergency services key identifier received in a message with a non-constrained emergency services pseudo key identifier according to claim 10, wherein:

said positioning center is a voice over Internet Protocol (VoIP) positioning center (VPC).

14. The method of replacing a constrained emergency services key identifier received in a message with a non-constrained emergency services pseudo key identifier according to claim 9, further comprising:

sending a message with said emergency services pseudo key identifier to a public safety access point (PSAP).

15. The method of replacing a constrained emergency services key identifier received in a message with a non-constrained emergency services pseudo key identifier according to claim 9, wherein:

said message is sent using an Internet Protocol message.

16. The method of replacing a constrained emergency services key identifier received in a message with a non-constrained emergency services pseudo key identifier according to claim 9, wherein:

said ESxK expires before use of said ESPK is completed.

17. The method of replacing a constrained emergency services key identifier received in a message with a non-constrained emergency services pseudo key identifier according to claim 9, further comprising:

generating a plurality of ESPKs each being a 10-digit identifier.

18. Apparatus for replacing a constrained emergency services key identifier received in a message with a non-constrained emergency services pseudo key identifier, comprising:

means for receiving a query message identified with a time constrained emergency services key (ESxK);

means for replacing said time constrained ESxK with an emergency services pseudo key (ESPK) eliminating a time constraint associated with said time constrained ESxK; and

means for transmitting said non-time constrained ESPK to an automatic location identification (ALI) database.

19. The apparatus for replacing a constrained emergency services key identifier received in a message with a non-constrained emergency services pseudo key identifier according to claim 18, wherein:

said received message is received by a positioning center identified with one of an emergency services query key (ESQK) and an emergency services routing key (ESRK).

20. The apparatus for replacing a constrained emergency services key identifier received in a message with a non-constrained emergency services pseudo key identifier according to claim 19, wherein:

said received message is received over an Internet.

21. The apparatus for replacing a constrained emergency services key identifier received in a message with a non-constrained emergency services pseudo key identifier according to claim 19, wherein:

said positioning center is a mobile positioning center in a cellular network.

22. The apparatus for replacing a constrained emergency services key identifier received in a message with a non-constrained emergency services pseudo key identifier according to claim 19, wherein:

said positioning center is a voice over Internet Protocol (VoIP) positioning center (VPC).

23. The apparatus for replacing a constrained emergency services key identifier received in a message with a non-constrained emergency services pseudo key identifier according to claim 18, further comprising:

means for sending a message with said emergency services pseudo key identifier to a public safety access point (PSAP).

24. The apparatus for replacing a constrained emergency services key identifier received in a message with a non-constrained emergency services pseudo key identifier according to claim 18, wherein:

said message is sent using an Internet Protocol message.

25. The apparatus for replacing a constrained emergency services key identifier received in a message with a non-constrained emergency services pseudo key identifier according to claim 18, wherein:

said ESxK expires before use of said ESPK is completed.

26. The method of replacing a constrained emergency services key identifier received in a message with a non-constrained emergency services pseudo key identifier according to claim 18, further comprising:

means for generating a plurality of ESPKs each being a 10-digit identifier.

27. The method of replacing a constrained emergency services key identifier received in a message with a non-constrained emergency services pseudo key identifier according to claim 26, wherein:

said plurality of ESPKs are each an alpha-numeric identifier.