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(12) United States Patent
(io) Patent No.: (45) Date of Patent:
US 7,536,209 B2 *May 19, 2009
A system and method is provided that provides a mobile communication device with the ability to quickly reestablish a communication session with another after the communication device is awaken from a sleep or idle mode. The mobile communication device is provided with a first power system for powering a central operating system and a second power system for powering a communication system. A mobile communication device establishes a communication session with another communication device by establishing a connection and establishing a communication session. During an idle period, the communication session in a stack will be stored in memory. The first power system and the central operating system will then enter a low power or sleep mode, while second power system and the communication system can maintain a communication connection with the other device. Upon reestablishing communications, the mobile communication device will wake up the first power supply and the central operating system. The central operating system will then copy the previous communication session from the memory into the stack and reestablish the communication session with the other device.
19 Claims, 7 Drawing Sheets