Power save with data fetch time period

• US 9,591,573 B2
• Filed: 08/13/2015
• Issued: 03/07/2017
• Est. Priority Date: 08/31/2011
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Wentink, Maarten Menzo, Sampath, Hemanth
• Primary Examiner(s): Han, Clemence
• Application Number:
  US14/825,915
• Publication Number:
  US 20150351031A1
• Time in Patent Office: 572 Days
• US Class Current: 1/1
• CPC Class Codes: H04L 1/1685 the supervisory signal being transmitted in response to a specific request, e.g. to a polling signal
• CPC Class Codes: H04W 28/0278 using buffer status reports dynamic wireless traffic scheduling definition H04W72/12
• CPC Class Codes: H04W 52/0216 using a pre-established activity schedule, e.g. traffic indication frame
• CPC Class Codes: H04W 52/0219 where the power saving management affects multiple terminals
• CPC Class Codes: H04W 52/0225 using monitoring of external events, e.g. the presence of a signal
• CPC Class Codes: H04W 52/0235 where the received signal is a power saving command
• CPC Class Codes: H04W 74/006 in the downlink, i.e. towards the terminal
• CPC Class Codes: H04W 74/06 using polling
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

A particular method includes receiving a power save polling frame from a station at an access point. The method also includes, in response to receiving the power save polling frame, transmitting a frame from the access point to the station indicating whether traffic associated with the station is buffered at the access point. Another particular method includes transmitting a frame from the station to the access point indicating that the station is to enter the power save mode and refraining from entering the power save mode until receipt of an end of data frame. Yet another particular method includes receiving a fetch trigger frame at an access point and refraining from transmitting one or more fetched data frames from the access point until a fetch time has elapsed or a delivery trigger frame is received. The access point is configured to communicate with other stations during the fetch time.

Claims

1. A method comprising:

receiving a frame from a station at an access point, the frame indicating that the station is to exit a power save mode; and

in response to receiving the frame, sending from the access point to the station;

an indicator of whether traffic associated with the station can be provided by the access point to the station, the indicator sent after a first short interframe space (SIFS) after the frame, and

information indicating a data fetch time period, an end of the data fetch time period indicating a start time of a service period of the access point.

2. The method of claim 1, wherein the frame includes a fetch trigger frame, and wherein the indicator includes a bit value in an acknowledgement short frame sent by the access point to the station in response to the frame.

3. The method of claim 1, wherein the frame includes a Power Save Poll (PS-Poll) frame.

4. The method of claim 1, wherein the information indicating the data fetch time period is included in an acknowledgement sent from the access point to the station.

5. The method of claim 1, further comprising fetching data corresponding to one or more data frames during the data fetch time period.

6. The method of claim 5, further comprising sending the one or more data frames from the access point to the station during the service period.

7. The method of claim 6, wherein at least one of the one or more data frames indicates an end of the service period.

8. The method of claim 1, further comprising after expiration of the data fetch time period, receiving a second frame from the station at the access point and sending one or more data frames from the access point to the station based on receiving the second frame.

9. The method of claim 8, further comprising fetching data corresponding to the one or more data frames after receiving the frame and prior to expiration of the data fetch time period.

10. The method of claim 9, wherein at least one of the one or more data frames indicates an end of the service period.

11. An apparatus comprising:

a processor; and

a memory storing instructions executable by the processor to perform operations comprising;

receiving a frame from a station at an access point, the frame indicating that the station is to exit a power save mode; and

in response to receiving the frame, sending from the access point to the station;

an indicator of whether traffic associated with the station can be provided by the access point to the station, the indicator sent after a first short interframe space (SIFS) after the frame, and

information indicating a data fetch time period, an end of the data fetch time period indicating a start time of a service period of the access point.

12. The apparatus of claim 11, wherein the frame includes a fetch trigger frame.

13. The apparatus of claim 11, wherein the frame includes a Power Save Poll (PS-Poll) frame.

14. The apparatus of claim 11, wherein the information indicating the data fetch time period is included in an acknowledgement sent from the access point to the station.

15. The apparatus of claim 11, wherein the operations further comprise fetching data corresponding to one or more data frames during the data fetch time period.

16. The apparatus of claim 15, wherein the operations further comprise sending the one or more data frames from the access point to the station during the service period.

17. The apparatus of claim 16, wherein at least one of the one or more data frames indicates an end of the service period.

18. The apparatus of claim 11, wherein the operations further comprise, after expiration of the data fetch time period, receiving a second frame from the station at the access point and sending one or more data frames from the access point to the station based on receiving the second frame.

19. The apparatus of claim 18, wherein the operations further comprise fetching data corresponding to the one or more data frames after receiving the frame and prior to expiration of the data fetch time period.

20. The apparatus of claim 19, wherein at least one of the one or more data frames indicates an end of the service period.

21. A non-transitory computer-readable medium comprising instructions that, when executed by a computer, cause the computer to perform operations comprising:

receiving a frame from a station at an access point, the frame indicating that the station is to exit a power save mode; and

in response to receiving the frame, sending from the access point to the station;

an indicator of whether traffic associated with the station can be provided by the access point to the station, the indicator sent after a first short interframe space (SIFS) after the frame, and

information indicating a data fetch time period, an end of the data fetch time period indicating a start time of a service period of the access point.

22. An apparatus comprising:

means for receiving a frame from a station at an access point, the frame indicating that the station is to exit a power save mode; and

means for sending from the access point to the station, in response to receiving the frame;

an indicator of whether traffic associated with the station can be provided by the access point to the station, the indicator sent after a first short interframe space (SIFS) after the frame, and

information indicating a data fetch time period, an end of the data fetch time period indicating a start time of a service period of the access point.

23. A method comprising:

transmitting a frame from a station to an access point, the frame indicating that the station is to exit a power save mode; and

in response to transmitting the frame, receiving at the station from the access point;

an indicator of whether traffic associated with the station can be provided by the access point to the station, the indicator sent by the access point after a first short interframe space (SIFS) after the frame, and

information indicating a data fetch time period, an end of the data fetch time period indicating a start time of a service period of the access point.

24. The method of claim 23, wherein the frame includes a fetch trigger frame.

25. The method of claim 23, wherein the frame includes a Power Save Poll (PS-Poll) frame.

26. The method of claim 23, wherein the information indicating the data fetch time period is included in an acknowledgement received at the station from the access point.

27. The method of claim 23, further comprising receiving one or more data frames from the access point during the service period.

28. The method of claim 27, wherein at least one of the one or more data frames indicates an end of the service period.

29. The method of claim 23, further comprising after expiration of the data fetch time period, sending a second frame from the station to the access point and receiving one or more data frames from the access point after sending the second frame.

30. The method of claim 23, further comprising, after transmitting the frame, remaining in the power save mode until the start time of the service period.

31. An apparatus comprising:

a processor; and

a memory storing instructions executable by the processor to perform operations comprising;

initiating transmission of a frame from a station to an access point, the frame indicating that the station is to exit a power save mode; and

in response to transmitting the frame, receiving at the station from the access point;

an indicator of whether traffic associated with the station can be provided by the access point to the station, the indicator sent by the access point after a first short interframe space (SIFS) after the frame, and

information indicating a data fetch time period, an end of the data fetch time period indicating a start time of a service period of the access point.

32. The apparatus of claim 31, wherein the frame includes a fetch trigger frame.

33. The apparatus of claim 31, wherein the frame includes a Power Save Poll (PS-Poll) frame.

34. The apparatus of claim 31, wherein the information indicating the data fetch time period is included in an acknowledgement received at the station from the access point.

35. The apparatus of claim 31, further comprising a receiver to receive one or more data frames from the access point during the service period.

36. The apparatus of claim 35, wherein at least one of the one or more data frames indicates an end of the service period.

37. The apparatus of claim 31, further comprising a transmitter to send a second frame from the station to the access point after expiration of the data fetch time period and a receiver to receive one or more data frames from the access point after the second frame is transmitted.

38. The apparatus of claim 31, wherein the operations further comprise, after transmitting the frame, remaining in the power save mode until the start time of the service period.

39. A non-transitory computer-readable medium comprising instructions that, when executed by a computer, cause the computer to perform operations comprising:

initiating transmission of a frame from a station to an access point, the frame indicating that the station is to exit a power save mode; and

in response to transmitting the frame, receiving at the station from the access point;

an indicator of whether traffic associated with the station can be provided by the access point to the station, the indicator sent by the access point after a first short interframe space (SIFS) after the frame, and

information indicating a data fetch time period, an end of the data fetch time period indicating a start time of a service period of the access point.

40. An apparatus comprising:

means for transmitting a frame from a station to an access point, the frame indicating that the station is to exit a power save mode; and

means for receiving at the station from the access point, in response to transmitting the frame;

an indicator of whether traffic associated with the station can be provided by the access point to the station, the indicator sent by the access point after a first short interframe space (SIFS) after the frame, and

information indicating a data fetch time period, an end of the data fetch time period indicating a start time of a service period of the access point.