Patent ID: 8374170

Claim:
A power management system for use in an electronic device, comprising: a baseband processing unit used to connecting to a communication network; an application processing unit processing signals from the baseband processing unit, wherein the application processing unit comprises a normal mode and a sleep mode, and the power consumed by the application processing unit in the sleep state is less than that in the normal state; and a wireless communication module comprising a packet pattern, receiving a data packet, and determining whether the data packet conforms to the packet pattern, when the data packet conforms to the packet pattern, transmitting a wake-up signal to the application processing unit, wherein, in response to the wake-up signal, the application processing unit enters the normal state from the sleep state, and performs an application operation according to the data packet, wherein the wireless communication module determines whether the data packet conforms to the packet pattern by determining whether the data packet is a VoIP packet.