Patent ID: 7529957

Claim:
A power management system in a mobile device having at least one processer and a network interface module, the at least one processor adapted to implement components comprising: a packet analyzer outputting a roundtrip time for a packet to be transmitted through the network interface module; a power management module for controlling a power state of the network interface module to operate in one of a constant awake mode, a maximum power saving mode, and a fast power saving mode, the power management module comprising: a delay sleep timer; a power management backend module to set the delay sleep timer based upon the roundtrip time and to determine when the network interface module is to be set to one of an on state and a doze state based on expiration of the delay sleep timer; a system state module in communication with the power management backend module to provide system state information to the power management backend module; and an interface list module in communication with the power management backend module to provide interface state information of the network interface module to the power management backend modules, wherein the maximum power saving mode comprises: a1) setting the network interface module to the doze state between listening intervals, each listening interval comprising a plurality of beacon intervals; and b1) setting the network interface module to the on state to receive a beacon for each listening interval; the fast power saving mode comprising: a2) setting the network interface module to the doze state between beacon intervals; and b2) setting the network interface module to the on state to receive a beacon for each beacon interval.