METHOD AND APPARATUS FOR WAKING DEVICE FROM POWER SAVE MODE

• US 20110185200A1
• Filed: 01/25/2011
• Published: 07/28/2011
• Est. Priority Date: 01/25/2010
• Status: Active Grant

• Current Assignee: Huawei Technologies Co., Ltd. (Huawei Investment & Holding Co., Ltd.)
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: SIM, Dae-yong, YANG, Chil-youl, NA, Il-ju, LEE, Jae-min, VERMA, Lochan
• Granted Patent: US 9,075,603 B2
• Time in Patent Office: Days
• US Class Current: 713/310
• CPC Class Codes: G06F 1/3203 Power management, i.e. event-based initiation of a power-saving mode
• CPC Class Codes: G06F 1/3206 Monitoring of events, devices or parameters that trigger a change in power modality
• CPC Class Codes: G06F 1/3234 Power saving characterised by the action undertaken
• CPC Class Codes: G06F 1/325 Power saving in peripheral device
• CPC Class Codes: G06F 13/385 for adaptation of a particular data processing system to different peripheral devices
• CPC Class Codes: G06F 9/4418 Suspend and resume; Hibernate and awake
• CPC Class Codes: H04L 12/12 Arrangements for remote connection or disconnection of substations or of equipment thereof
• CPC Class Codes: Y02D 10/00 Energy efficient computing, e.g. low power processors, power management or thermal management
• CPC Class Codes: Y02D 30/50 in wire-line communication networks, e.g. low power modes or reduced link rate
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

A method for waking a device from a power save mode to an active mode includes: transmitting, by a first device, a magic packet through a predetermined channel to a second device, which operates in the power save mode by repeating a doze state and an awake state according to a predetermined period of time, for notifying the second device to switch to the active mode; and retransmitting the magic packet to the second device through the predetermined channel if a response to the magic packet has not been received from the second device and a predetermined time has not elapsed after transmitting the magic packet through the predetermined channel.

Claims

1. A method for switching a second device from a power save mode to an active mode by a first device, the method comprising:

transmitting, by the first device, a magic packet through a predetermined channel to the second 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, for notifying the second device to switch to the active mode; and

retransmitting the magic packet to the second device through the predetermined channel if a response to the magic packet has not been received from the second device and a predetermined time has not elapsed after transmitting the magic packet through the predetermined channel.

2. The method of claim 1, further comprising transmitting the magic packet through a different channel from the predetermined channel if a response to the magic packet has not been received from the second device and the predetermined time has elapsed after first transmitting the magic packet through the predetermined channel.

3. The method of claim 1, wherein the predetermined time is longer than a time for the second device to be in the doze state.

4. The method of claim 1, wherein the predetermined time is the same as the predetermined period of time.

5. The method of claim 1, wherein the predetermined period of time is a beacon interval.

6. The method of claim 1, wherein the predetermined channel comprises a channel which was last used by the first device to communicate with the second device.

7. The method of claim 1, wherein the predetermined channel comprises a social channel.

8. The method of claim 1, further comprising the first device forming a Peer to Peer (P2P) group with the second device if a response to the magic packet has been received from the second device.

9. The method of claim 8, wherein the forming of the P2P group comprises the first device forming the P2P group with the second device by using Credentials stored in the first device.

10. The method of claim 1, wherein the first device is a P2P client, and the second device is a P2P group owner.

11. The method of claim 1, wherein the magic packet is a probe request frame, wherein a value of a bit 6 or 7 of a device capability bitmap field of a P2P capability subelement of the probe request frame is 1.

12. The method of claim 1, wherein the magic packet is a P2P public action frame, a type value of which is one of 9 to 255.

13. The method of claim 1, wherein the magic packet is a P2P action frame, a type value of which is one of 4 to 255.

14. The method of claim 1, wherein the first device and the second device are wireless fidelity (Wi-Fi) P2P devices.

33. A computer-readable non-transitory recording medium storing a computer-readable program for executing the method of claim 1.

15. A method for switching a second device from a power save mode to an active mode by a first device, the method comprising:

performing synchronization by forming a Peer to Peer (P2P) group with the second device; and

transmitting, by the first device, a magic packet notifying the second device to switch to the active mode when the second device operating in the power save mode by repeating a doze state and an awake state is in the awake state, based on the synchronization.

16. The method of claim 15, wherein one of the first device and the second device is a P2P client, the other of the first device and the second device is a P2P group owner, and

when the second device is in the awake state, the P2P group owner transmits a beacon to the P2P client.

17. The method of claim 15, wherein the first device is a P2P client, and the second device is a P2P group owner.

18. The method of claim 17, wherein the transmitting of the magic packet comprises transmitting the magic packet to the second device after receiving a beacon from the second device when the second device is in the awake state.

19. The method of claim 17, wherein the transmitting of the magic packet comprises transmitting the magic packet to the second device within a Client Traffic Window (CTWindow).

34. A computer-readable non-transitory recording medium storing a computer-readable program for executing the method of claim 15.

20. A method for switching from a power save mode to an active mode by a second device communicating with a first device, the method comprising:

receiving, from the first device, a magic packet for notifying the second device to switch to the active mode when the second device operating in the power save mode by repeating a doze state and an awake state is in the awake state; and

switching to the active mode upon receiving the magic packet.

21. The method of claim 20, wherein the receiving the magic packet comprises the second device receiving the magic packet in a state of not being synchronized with the first device.

22. The method of claim 20, further comprising the second device forming a Peer to Peer (P2P) group with the first device after switching to the active mode.

23. The method of claim 22, wherein the forming of the P2P group comprises the second device forming the P2P group with the first device by using Credentials stored in the second device.

24. The method of claim 20, further comprising performing synchronization by the second device forming a P2P group with the first device,

wherein the receiving of the magic packet comprises receiving the magic packet from the first device when the second device is in the awake state, based on the synchronization.

25. The method of claim 20, wherein the first device is a P2P client, and the second device is a P2P group owner.

26. The method of claim 25, wherein the receiving of the magic packet by the second device comprises receiving the magic packet from the first device after transmitting a beacon to the first device when the second device is in the awake state.

35. A computer-readable non-transitory recording medium storing a computer-readable program for executing the method of claim 20.

27. 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; 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.

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

a synchronizer for performing synchronization by forming a Peer to Peer (P2P) group with the peer device; and

a transmitter for transmitting a magic packet notifying the peer device to switch to the active mode when the peer device operating in the power save mode by repeating a doze state and an awake state is in the awake state, based on the synchronization.

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

a receiver for receiving a magic packet for notifying the peer device to switch to the active mode when the peer device operating in the power save mode by repeating a doze state and an awake state is in the awake state; and

a switching unit for switching to the active mode upon receiving the magic packet.

30. A method of switching a wireless fidelity peer to peer (Wi-Fi P2P) device from a power save mode to an active mode, the method comprising:

setting a value of bit 6 or 7 of a device capability bitmap field of a P2P capability subelement of a probe request frame according to a Wi-Fi P2P standard to 1; and

transmitting the probe request frame notifying the Wi-Fi P2P device, which operates in a power save mode by repeating a doze state and an awake state, to switch to an active mode based on the value of bit 6 or 7 being set to 1.

31. A method of switching a wireless fidelity peer to peer (Wi-Fi) P2P device from a power save mode to an active mode, the method comprising:

setting a type value of a P2P public action frame to one of 9 to 255; and

transmitting the P2P public action frame notifying the Wi-Fi P2P device, which operates in a power save mode by repeating a doze state and an awake state to switch to an active mode based on the type value of the P2P public action frame being one of 9 to 255.

32. A method of switching a wireless fidelity peer to peer (Wi-Fi) P2P device from a power save mode to an active mode, the method comprising:

setting a type value of a P2P action frame to one of 4 to 255; and

transmitting the P2P action frame notifying the Wi-Fi P2P device, which operates in a power save mode by repeating a doze state and an awake state to switch to an active mode based on the type value of the P2P action frame being one of 4 to 255.