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1. (US20140126442) Systems and methods for low power wake-up signal implementation and operations for WLAN
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Claims

1. An apparatus for wireless communications, comprising:
a first receiver;
a processing system configured to activate the first receiver for a period of time exceeding or equaling at least a transmission period of a wake-up sequence, wherein the wake-up sequence comprises a wake-up message and the transmission period of the wake-up sequence comprises a wake-up message transmission period, and wherein the first receiver is configured to receive the wake-up message during the period of time and to provide, in response, a signal to operate a second receiver in the apparatus; and
a transmitter configured to transmit a message acknowledging receipt of the wake-up message.
2. The apparatus of claim 1, wherein the processing system further comprises an activation circuit, the activation circuit being configured to activate the first receiver at a defined time, the defined time being at a start of the period of time.
3. The apparatus of claim 2, wherein the first receiver is configured to cycle between an awake state and a sleep state according to a duty cycle prior to receiving the wake-up message, and wherein the defined time corresponds to a beginning of the awake state.
4. The apparatus of claim 1, wherein the processing system is further configured to decode at least the wake-up message using at least one of an on-off keying modulation or a frequency-shift keying modulation, the processing system being further configured to activate the second receiver based at least in part on the decoded wake-up message.
5. The apparatus of claim 1, wherein the wake-up message is a paging message configured in a null data packet (NDP) format.
6. The apparatus of claim 1, wherein the wake-up message comprises a device class identifier, and wherein the processing system is further configured to determine whether the device class identifier matches a stored identifier.
7. The apparatus of claim 1, wherein the wake-up message comprises a message type identifier, and wherein the processing system is further configured to determine whether the message type identifier matches a stored message type identifier.
8. The apparatus of claim 1, wherein the processing system receives the wake-up message from a device that is not synchronized with the apparatus.
9. The apparatus of claim 1, wherein the processing system receives the wake-up message from a device that is not associated with the apparatus.
10. The apparatus of claim 1, wherein the wake-up message comprises a station identifier, and wherein the processing system is further configured to determine whether the station identifier matches a stored identifier.
11. The apparatus of claim 10, wherein the station identifier comprises a plurality of bits, one of the plurality of bits identifying the apparatus.
12. The apparatus of claim 1, wherein the first receiver is configured to receive the wake-up sequence during the period of time, and wherein in response to receiving the wake-up sequence, the processing system is further configured to determine whether a confirmation identifier in the wake-up sequence matches both a station identifier in the wake-up message and an identifier stored in the apparatus.
13. The apparatus of claim 12, wherein each of the station identifier in the wake-up message and the confirmation identifier indicates that information is to be transmitted to the apparatus.
14. The apparatus of claim 12, wherein the confirmation identifier is received subsequent to the wake-up message in the wake-up sequence.
15. The apparatus of claim 1, wherein:
the wake-up message identifies a sequence number in a plurality of wake-up sequences, the plurality of wake-up sequences comprising the wake-up sequence,
the processing system is further configured to determine an end of a transmission of the plurality of wake-up sequences based on the identified sequence number, and
the transmitter is configured to transmit the message acknowledging receipt of the wake-up message at the end of the transmission.
16. The apparatus of claim 15, wherein the sequence number indicates a number of the plurality of wake-up sequences to be sent after the wake-up message.
17. The apparatus of claim 15, wherein the sequence number is a reverse-ordered number, the reverse-ordered number indicating a number of the plurality of wake-up sequences to be sent after the wake-up message.
18. The apparatus of claim 1, wherein the processing system is further configured to activate the second receiver based on the wake-up message.
19. The apparatus of claim 18, wherein the second receiver consumes more power when activated than the first receiver consumes when activated.
20. A method of wireless communication, comprising:
activating a first receiver in an apparatus for a period of time, the period of time exceeding or equaling at least a transmission period of a wake-up sequence that includes a wake-up message plus a wake-up message transmission period, wherein the first receiver is configured to receive the wake-up message during the period of time;
providing, in response to the receipt of the wake-up message, a signal to operate a second receiver in the apparatus using the first receiver; and
transmitting a message acknowledging receipt of the wake-up message.
21. The method of claim 20 further comprising activating the first receiver at a defined time, the defined time being at a start of the period of time.
22. The method of claim 21, further comprising cycling the first receiver between an awake state and a sleep state according to a duty cycle prior to receiving the wake-up message, and wherein the defined time corresponds to a beginning of the awake state.
23. The method of claim 20 further comprising:
decoding at least the wake-up message using at least one of an on-off keying modulation or a frequency-shift keying modulation; and
activating the second receiver based at least in part on the decoded wake-up message.
24. The method of claim 20, wherein the wake-up message is a paging message configured in a null data packet (NDP) format.
25. The method of claim 20, wherein the wake-up message comprises a station identifier, the method further comprising determining whether the station identifier matches a stored identifier.
26. The method of claim 25, wherein the station identifier comprises a plurality of bits, one of the plurality of bits identifying a station.
27. The method of claim 20, wherein the wake-up message comprises a device class identifier, the method further comprising determining whether the device class identifier matches a stored identifier.
28. The method of claim 20, wherein the wake-up message comprises a message type identifier, the method further comprising determining whether the message type identifier matches a stored message type identifier.
29. The method of claim 20, wherein the wake-up sequence comprises a confirmation identifier; and wherein the method further comprises receiving the wake-up sequence during the period of time; and determining whether the confirmation identifier in the wake-up sequence matches both a station identifier in the wake-up message and an identifier stored in a station.
30. The method of claim 29, wherein each of the station identifier in the wake-up message and the confirmation identifier indicates that information is to be transmitted to the apparatus.
31. The method of claim 29, wherein the confirmation identifier is received subsequent to the wake-up message in the wake-up sequence.
32. The method of claim 20, wherein the wake-up message identifies a sequence number in a plurality of wake-up sequences, the plurality of wake-up sequences comprising the wake-up sequence, the method further comprising:
determining an end of a transmission of the plurality of wake-up sequences based on the identified sequence number, and
transmitting the message acknowledging receipt of the wake-up message at the end of the transmission.
33. The method of claim 32, wherein the sequence number indicates a number of the plurality of wake-up sequences to be sent after the wake-up message.
34. The method of claim 32, wherein the sequence number is a reverse-ordered number, the reverse-ordered number indicating a number of the plurality of wake-up sequences to be sent after the wake-up message.
35. The method of claim 20 further comprising activating the second receiver based on the wake-up message.
36. The method of claim 35, wherein the second receiver consumes more power when activated than the first receiver consumes when activated.
37. The method of claim 20, further comprising receiving the wake-up message from a device that is not synchronized with the first receiver.
38. The method of claim 20, further comprising receiving the wake-up from a device that is not associated with the first receiver.
39. An apparatus for wireless communications, comprising:
means for activating a first receiver for a period of time, the period of time exceeding or equaling at least a transmission period of a wake-up sequence that includes a wake-up message plus a wake-up message transmission period, wherein the first receiver is configured to receive the wake-up message during the period of time;
means for providing, in response to the receipt of the wake-up message, a signal to operate a second receiver in the apparatus using the first receiver; and
means for transmitting a message acknowledging receipt of the wake-up message.
40. The apparatus of claim 39, wherein the means for activating the first receiver activates the first receiver at a defined time, the defined time being at a start of the period of time.
41. The apparatus of claim 40, wherein the means for activating is further configured to cycle the first receiver between an awake state and a sleep state according to a duty cycle prior to receiving the wake-up message, and wherein the defined time corresponds to a beginning of the awake state.
42. The apparatus of claim 39 further comprising means for decoding at least the wake-up message using at least one of an on-off keying modulation or a frequency-shift keying modulation, wherein the means for activating is further configured to activate a second receiver based at least in part on the decoded wake-up message.
43. The apparatus of claim 39, wherein the wake-up message is a paging message configured in a null data packet (NDP) format.
44. The apparatus of claim 39, wherein the wake-up message comprises a station identifier, the apparatus further comprising means for determining whether the station identifier matches a stored identifier.
45. The apparatus of claim 44, wherein the station identifier comprises a plurality of bits, one of the plurality of bits identifying a station.
46. The apparatus of claim 39, wherein the wake-up message comprises a device class identifier, the apparatus further comprising means for determining whether the device class identifier matches a stored identifier.
47. The apparatus of claim 39, wherein the wake-up message comprises a message type identifier, the apparatus further comprising means for determining whether the message type identifier matches a stored message type identifier.
48. The apparatus of claim 39, wherein the wake-up sequence comprises a confirmation identifier, and wherein the apparatus further comprises means for receiving the wake-up sequence during the period of time; and means for determining whether the confirmation identifier in the wake-up sequence matches both a station identifier in the wake-up message and an identifier stored in a station.
49. The apparatus of claim 48, wherein each of the station identifier in the wake-up message and the confirmation identifier indicates that information is to be transmitted to the apparatus.
50. The apparatus of claim 49 wherein the confirmation identifier is received subsequent to the wake-up message in the wake-up sequence.
51. The apparatus of claim 39, wherein the wake-up message identifies a sequence number in a plurality of wake-up sequences, the plurality of wake-up sequences comprising the wake-up sequence, the apparatus further comprising:
means for determining an end of a transmission of the plurality of wake-up sequences based on the identified sequence number, and
means for transmitting the message acknowledging receipt of the wake-up message at the end of the transmission.
52. The apparatus of claim 51, wherein the sequence number indicates a number of the plurality of wake-up sequences to be sent after the wake-up message.
53. The apparatus of claim 51, wherein the sequence number is a reverse-ordered number, the reverse-ordered number indicating a number of the plurality of wake-up sequences to be sent after the wake-up message.
54. The apparatus of claim 39 further comprising means for activating a second receiver based on the wake-up message.
55. The apparatus of claim 54, wherein the second receiver consumes more power when activated than the first receiver consumes when activated.
56. The apparatus of claim 39, further comprising means for receiving the wake-up message from a device that is not synchronized with the first receiver.
57. The apparatus of claim 39, further comprising means for receiving the wake-up from a device that is not associated with the first receiver.
58. A non-transitory computer readable storage medium with instructions encoded thereon that when executed cause an apparatus to perform a method comprising:
activating a first receiver for a period of time, the period of time exceeding or equaling at least a transmission period of a wake-up sequence that includes a wake-up message plus a wake-up message transmission period, wherein the first receiver is configured to receive the wake-up message during the period of time;
providing, in response to the receipt of the wake-up message, a signal to operate a second receiver in the apparatus using the first receiver; and
transmitting a message acknowledging receipt of the wake-up message.
59. A mobile station, comprising:
at least one antenna;
a first receiver;
a processing system configured to activate the first receiver for a period of time, the period of time exceeding or equaling at least a transmission period of a wake-up sequence that includes a wake-up message plus a wake-up message transmission period, wherein the first receiver is configured to receive, via the at least one antenna, the wake-up message during the period of time;
providing, in response to the receipt of the wake-up message, a signal to operate a second receiver in the apparatus; and
a transmitter configured to transmit, via the at least one antenna, a message acknowledging receipt of the wake-up message.