Method and apparatus for waking device from power save mode

An apparatus for switching a peer device from a power save mode to an active mode, the apparatus comprising:

• a transmitter for transmitting through a predetermined channel a magic packet for notifying the peer device, which operates in the power save mode by repeating a doze state and an awake state periodically according to a predetermined period of time to switch to the active mode, wherein the magic packet includes contents of a command for switching a value of a power management field which is a subfield of a frame control field of the peer device receiving the magic packet;
• and
• a receiver for receiving a response to the magic packet from the peer device,
• wherein the transmitter retransmits the magic packet to the peer device through the predetermined channel if a response to the magic packet has not been received from the peer device and a predetermined time has not elapsed after transmitting the magic packet through the predetermined channel.