IMSI conversion method

• US 20020142752A1
• Filed: 04/03/2001
• Published: 10/03/2002
• Est. Priority Date: 04/03/2001
• Status: Active Grant

• Current Assignee: Alcatel-Lucent USA, Inc. (Nokia Corporation)
• Original Assignee: Lucent Technologies, Inc. (Nokia Corporation)
• Inventors: Chin, Terry D., Garvert, Anita R., Henrikson, Eric H.
• Granted Patent: US 6,819,918 B2
• Time in Patent Office: Days
• US Class Current: 455/411
• CPC Class Codes: H04Q 3/0025 Provisions for signalling
• CPC Class Codes: H04W 8/26 Network addressing or numbering for mobility support
• CPC Class Codes: H04W 88/14 Backbone network devices

Abstract

A method is disclosed for processing an International mobile Station Identifier (IMSI) which may be received in different formats into a common uniform binary format of two n-bit binary words for processing within a network element such as a Mobile Switch Center (MSC) or other switching system or device or other call processing apparatus.

Claims

1. A method of converting an international mobile station identifier into a uniform processing format comprising:

receiving international mobile station identifier information in an over-the-air format; and

converting said received information into a uniform binary format and using said uniform binary format for processing within a mobile switching center.

2. A method as in claim 1 wherein said over-the-air format is dictated by a standardization protocol.

3. A method as in claim 2 wherein said over-the-air format is a time division multiple access format.

4. A method as in claim 2 wherein said over-the-air format is a code division multiple access format.

5. A method as in claim 1 further comprising utilizing said uniform binary format for resource allocation in a mobile switching center.

6. A method as in claim 1 wherein said received international mobile station identifier information comprises a plurality of identification digits and said uniform format comprises a first and second n-bit binary number, said first n-bit binary number representing a first portion of said plurality of identification digits and said second n-bit binary number representing a second portion of said plurality of identification digits.

7. A method as in claim 6 wherein said plurality of identification digits includes fifteen digits, said first portion representing the first through ninth identification digits and the second portion representing the tenth through fifteenth digits.

8. A method as in claim 7 wherein said first binary number has said digits one through nine encoded as a first 10 bits for digits one, two and three, a second 10 bits for digits four, five and six, a third 10 bits for digits seven eight and nine.

9. A method as in claim 8 wherein said first binary number contains 32 bits, including the first, second and third 10 bits and two fill bits.

10. A method as in claim 7 wherein said second binary number has said digits ten through fifteen encoded as a first 10 bits for digits ten, eleven and twelve, and a second 10 bits for digits thirteen, fourteen and fifteen.

11. A method as in claim 10 wherein said second binary number contains 32 bits, including said first and second 10 bits and a predetermined number of bits indicating an international mobile station identification information length.

12. A method as in claim 11 wherein said length is encoded in said second binary number as four bits.

13. A method as in claim 12 wherein said second binary number includes eight fill bits.

15. A method as in claim 14 wherein n equals 32.

16. A method as in claim 14 wherein said first n-bit representation represents the digits d₁ through d₉ and the second n-bit representation represents the digits d₁₀ through d₁₅.

17. A method as in claim 14 wherein said first format is a format specified in the IS-136 standard.

18. A method as in claim 14 wherein said first format is a format specified in the IS-95 standard.

19. A method as in claim 16 wherein said second n-bit representation includes a representation of the length of said international mobile station identification.

14. A method of handling international mobile station identification within a network element comprising:

receiving an international mobile station identification containing up to fifteen digits in a first specified format; and

converting said received international mobile station identification to a pair of n-bit binary representations in which a first one of said n-bit binary representations represents a first set of predetermined digits of said identification and a second one of said n-bit binary representation represents a second set of different predetermined digits of said identification.