Patent ID: 8498240

Claim:
A wireless communications device connected to a service network with a synchronized timing pattern therebetween, comprising: a wireless modem configured to enable wireless signal transceiving from and to the service network in a non-sleep mode and disable wireless signal transceiving from and to the service network in a sleep mode; and a synchronization module configured to initialize a first counter with a current time in the synchronized timing pattern in response to a first signal triggering the wireless modem to enter the sleep mode from the non-sleep mode, enable counting of the first counter in a low-rate clock for the sleep mode, and provide the counted value of the first counter to the wireless modem to resynchronize with the service network in response to a second signal triggering the wireless modem to recover from the sleep mode to the non-sleep mode, wherein the current time in the synchronized timing pattern is maintained by a second counter counting in a high-rate clock for the non-sleep mode, and the second counter is reinitialized with the counted value of the first counter when the wireless modem recovers from the sleep mode to the non-sleep mode.