Patent ID: 8311594

Claim:
A mobile device battery power saving system comprising: a channel processor to monitor a system channel and to provide a flag signal indicating a loss of the system channel; a deep sleep controller to determine a number of times the system channel is lost within a timeout period based on the flag signal and, to initiate, when the number of times the system channel is lost exceeds a preset number within the timeout period, a system lost exit by entering a deep sleep mode level of a deep sleep mode, the deep sleep mode having first, second, and third deep sleep mode levels, each of the deep sleep mode levels having associated therewith a respective system acquisition list and a respective sleep time interval; a variable setting controller to set the respective sleep time interval associated with the current deep sleep mode level; and a low power controller to iteratively sample, after an elapse of the respective sleep time interval, RF signal strength of systems in the respective system acquisition list associated with the current deep sleep mode level, and if the sampled RF signal strength of the systems in the respective system acquisition list associated with the current deep sleep mode level is less than a preset level, causes the mobile device to re-enter the deep sleep mode at a subsequent deep sleep mode level.