Subscriber identity module verification during power management

Details Subscriber identity module verification during power management Subscriber identity module verification during power management

2006-11-14

2006-11-14

Barron, Jr., Gilberto (Department: 2131)

Electrical computers and digital processing systems: support

Multiple computer communication using cryptography

Particular communication authentication technique

C713S320000, C726S019000, C726S036000, C455S410000

Reexamination Certificate

active

07137003

ABSTRACT:
Power management techniques for a Subscriber Identity Module (SIM) of a wireless communication device (WCD) are described tat make use of a unique identifier for the SIM. In particu1ar a processor within the WCD reads a first unique identifier from the SIM when power is initially supplied to the WCD, and stores the first unique identifier within a computer-readable medium within the WCD. During a power management cycle, where power is terminated and then re-supplied to the SIM, the processor again receives a unique identifier from the SIM and compares the second unique identifier with the stored unique identifier. These tecbniques are useful in detecting whether the attached SIM has been exchanged for a different SIM while powered down during a power management cycle.

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