Automating radio enablement to facilitate power saving

• US 9,820,226 B2
• Filed: 05/29/2014
• Issued: 11/14/2017
• Est. Priority Date: 06/25/2010
• Status: Active Grant

• Current Assignee: Cisco Technology, Inc. (Cisco Systems, Inc.)
• Original Assignee: Cisco Technology, Inc. (Cisco Systems, Inc.)
• Inventors: Thomson, Allan, Torres, Esteban
• Primary Examiner(s): Divito, Walter
• Application Number:
  US14/289,779
• Publication Number:
  US 20140269481A1
• Time in Patent Office: 1,265 Days
• CPC Class Codes: H04B 1/005 adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges
• CPC Class Codes: H04L 12/12 Arrangements for remote connection or disconnection of substations or of equipment thereof
• CPC Class Codes: H04W 52/0216 using a pre-established activity schedule, e.g. traffic indication frame
• CPC Class Codes: H04W 52/0235 where the received signal is a power saving command
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

In an example embodiment, there is disclosed herein an apparatus comprising a wireless transceiver and a controller coupled to the wireless transceiver and configured to receive data via the wireless transceiver. The controller operates the wireless transceiver at a first power save state where the wireless transceiver can receive a frame but other circuits are de-energized. The controller is responsive to the wireless transceiver receiving a frame while the wireless transceiver is in a first power state to determine whether the frame is a predefined wakeup frame. The controller provides additional power to the wireless transceiver responsive to determining the frame is a predefined wakeup frame.

Claims

1. A method of communicating using a first wireless transceiver comprising a transmitter, a receiver, and a decryption circuit, the method comprising:

transitioning the first wireless transceiver, from a first power state in which the transmitter, the receiver, and the decryption circuit are each de-energized, into a second power state for a plurality of predetermined intervals, wherein during each predetermined interval in the second power state, the receiver is powered and the decryption circuit and the transmitter are each initially de-energized;

upon determining, based on an address included within a frame received by the receiver within the second power state, that the frame is a predefined wakeup frame, powering the decryption circuit;

upon determining, using the decryption circuit, that a signature included within the frame is valid, selectively powering the transmitter, the receiver, and the decryption circuit to enable operative communication of the first wireless transceiver with a first network; and

while the first wireless transceiver is in operative communication with the first network, selectively re-routing traffic, initially targeted to a second wireless transceiver for communication using a second network, to the first wireless transceiver.

2. The method of claim 1, wherein the address of included within the frame comprises a destination address, and

wherein determining that the frame is a predefined wakeup frame comprises determining whether the destination address is a predefined multicast destination address.

3. The method of claim 1, wherein during each predetermined interval in the second power state, the first wireless transceiver is operated on a selected wireless channel of a plurality of wireless channels to listen for the predefined wakeup frame.

4. The method of claim 1, further comprising:

switching on the transmitter responsive to determining that the frame is the predefined wakeup frame; and

attempting to associate with a network via the first wireless transceiver.

5. The method of claim 4, further comprising:

transitioning, when the first wireless transceiver is unable to successfully associate with the network within a predetermined time period, the first wireless transceiver to the first power state.

6. The method of claim 1, further comprising:

determining, from the predefined wakeup frame, access point and channel data corresponding to at least one access point.

7. The method of claim 6, further comprising:

switching the first wireless transceiver to a channel specified by the channel data.

8. The method of claim 1, further comprising:

receiving, within the second power state, a sequence of frames via the receiver,

wherein determining that the frame is a predefined wakeup frame comprises determining whether the sequence of frames is a predetermined sequence of wakeup frames.

9. The method of claim 8, further comprising:

determining, via the decryption circuit, whether each frame of the sequence of frames has a valid signature corresponding to the predetermined sequence of wakeup frames, the valid signature including an identifier of an access point sending the wakeup frame or an identifier of a network associated with the access point.

10. The method of claim 9, further comprising:

powering the transmitter responsive to determining that each frame of the sequence of frames has a valid signature corresponding to the predetermined sequence of wakeup frames.

11. The method of claim 10, further comprising:

providing additional power to the first wireless transceiver responsive to determining the predetermined sequence of wakeup frames was received.

12. The method of claim 1, further comprising:

communicating using the second wireless transceiver while the first wireless transceiver is in the first power state or the second power state.

13. A non-transitory tangible computer-readable medium comprising code which, when executed by one or more processors, performs an operation for communicating using a first wireless transceiver, the operation comprising:

transitioning a first wireless transceiver, from a first power state in which a transmitter, a receiver, and a decryption circuit of the first wireless transceiver are each de-energized, into a second power state for a plurality of predetermined intervals, wherein during each predetermined interval in the second power state, the receiver is powered and the decryption circuit and the transmitter are each initially de-energized;

upon determining, based on an address included within a frame received by the receiver within the second power state, that the frame is a predefined wakeup frame, powering the decryption circuit;

upon determining, using the decryption circuit, that a signature included within the frame is valid, selectively powering the transmitter, the receiver, and the decryption circuit to enable operative communication of the first wireless transceiver with a first network; and

while the first wireless transceiver is in operative communication with the first network, selectively re-routing traffic, initially targeted to a second wireless transceiver for communication using a second network, to the first wireless transceiver.

14. The computer-readable medium of claim 13, wherein the address included within the frame comprises a destination address, the operation further comprising:

determining whether the destination address is a predefined multicast destination address.

15. The computer-readable medium of claim 13, the operation further comprising:

operating, during each predetermined interval in the second power state, the first wireless transceiver on a selected wireless channel of a plurality of wireless channels to listen for the predefined wakeup frame.

16. The computer-readable medium of claim 13, the operation further comprising:

switching on the transmitter responsive to determining that the frame is that the predefined wakeup frame; and

attempting to associate with a network via the first wireless transceiver.

17. The computer-readable medium of claim 16, the operation further comprising:

transitioning, when the first wireless transceiver is unable to successfully associate with the network within a predetermined time period, the first wireless transceiver to the first power state.

18. The computer-readable medium of claim 13, the operation further comprising:

receiving, within the second power state, a sequence of frames via the receiver,

wherein determining that the frame is a predetermined wakeup frame comprises determining whether the sequence of frames is a predetermined sequence of wakeup frames.

19. The computer-readable medium of claim 18, the operation further comprising:

determining, via the decryption circuit, whether each frame of the sequence of frames has a valid signature corresponding to the predetermined sequence of wakeup frames, the valid signature including an identifier of an access point sending the wakeup frame or an identifier of a network associated with the access point.

20. A non-transitory tangible computer-readable medium comprising code which, when executed by one or more processors, performs an operation for communicating using first and second wireless transceivers, the operation comprising:

periodically transitioning the second wireless transceiver from a first power state into a second power state for a predetermined interval, wherein a receiver of the second wireless transceiver is de-energized in the first power state and unable to receive data, and wherein during the predetermined interval in the second power state, the receiver is powered and able to receive data and a decryption circuit and a transmitter of the second wireless transceiver are each initially de-energized;

upon determining that a frame received by the receiver within the second power state is a predefined wakeup frame, powering the decryption circuit and determining, via the decryption circuit, that the frame includes a valid signature;

selectively powering the transmitter, the receiver, and the decryption circuit, and

associating the second wireless transceiver with a wireless local area network for communication thereon; and

while the second wireless transceiver is associated with the wireless local area network, selectively re-routing traffic, initially targeted to the first wireless transceiver for communication via a cellular network, to the second wireless transceiver.