Title:
POWER MANAGEMENT FOR SUBSCRIBER IDENTITY MODULE
Document Type and Number:
WIPO Patent Application WO2002069655
Kind Code:
A3
Abstract:
Power management techniques for a Subscriber Identity Module (SIM) of a wireless communication device (WCD) are described. On technique makes use of a unique identifier for the SIM. In particular, a processor within the WCD reads a first unique identifier from the SIM when power is initially supplied to the WCD. During a power management cycle, the processor again receives a unique identifier from the SIM and compares the second unique identifier with the first unique identifier. This technique is useful in detecting whether the attached SIM has been exchanged. A voting process is also described to determine when to power-up and power-down the SIM. In particular, the voting process determines whether software modules running on the WCD require current or imminent access to the SIM. A modified security authorization process can be added, in which the WCD caches a user access code for authenticating the user.
Inventors:
KRISHNAN CHIDAMBARAM
HUTCHISON JAMES A IV
SUMMERS TOM
HUTCHISON JAMES A IV
SUMMERS TOM
Application Number:
PCT/US2002/006029
Publication Date:
March 06, 2003
Filing Date:
February 26, 2002
Export Citation:
Assignee:
QUALCOMM INC (US)
International Classes:
H04B7/26; H04W52/02; H04B1/16; H04W88/02; (IPC1-7): H04Q7/32
Foreign References:
| EP0822730A2 | 1998-02-04 | |||
| US6138005A | 2000-10-24 | |||
| US6124799A | 2000-09-26 |
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