Telecommunications – Radiotelephone system – Security or fraud prevention
Patent
1995-06-07
1998-10-27
Hudspeth, David R.
Telecommunications
Radiotelephone system
Security or fraud prevention
455418, H04M 1100
Patent
active
058289569
ABSTRACT:
A module (P-code module) provides parameter information to a Number Assignment Module (NAM) in a cellular phone unit by processing a simple programming code (P-code) entered by the user through a telephone keypad. The P-code employs a flexible length telephone keypad coding that can be translated into programmable parameters of cellular phone products. Field identification numbers and look-up tables are used to shorten the P-code length for more frequently used information. To activate a cellular phone, the user provides product and serial number information to a dial-up access center which then generates a scrambled P-code for entry by the user. The P-code module within the processor unit of the cellular phone likewise descrambles, decompresses, and performs an integrity check on the sequence of digits being entered by the user. This P-code module reduces the technical requirements for programming a cellular phone purchased at the retail level such that a user can perform the necessary programming for activating the cellular telephone on a local telephone network. A security arrangement randomly generates two passwords when the cellular telephone is activated to prevent unauthorized reprogramming of the phones for use on other cellular telephone networks.
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CM-H333, Sony, "Portable Cellular Telephone with Accessories, Operating Instructions".
CM-H333, Sony, "Portable Cellular Telephone, Instruction for Programming NAM Data".
Hudspeth David R.
Kananen Ronald P.
Richardson Scott
Sony Electronics Inc.
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