Power save with data fetch time, with end of data indication, and with more data acknowledgement

1. A method comprising:

transmitting a fetch trigger frame from a station to an access point;

entering a power save mode at the station until a determination at the station that a fetch time associated with the station has elapsed, wherein the access point is configured to communicate with one or more other stations during the fetch time; and

in response to the determination, exiting the power save mode and receiving one or more data frames from the access point at the station after exiting the power save mode;

wherein, in response to the fetch trigger frame, the station receives from the access point a particular frame that includes a beacon version number.

2. The method of claim 1 , wherein the fetch time is indicated in the fetch trigger frame.

3. The method of claim 2 , wherein the fetch time is indicated in an acknowledgement frame received in response to the fetch trigger frame or in a beacon frame.

4. The method of claim 1 , wherein the fetch trigger frame comprises a power save poll (PS-Poll) frame or an unscheduled asynchronous power save delivery (U-APSD) frame.

5. The method of claim 1 , further comprising, in response to the determination that the fetch time has elapsed, transmitting a delivery trigger frame to the access point and refraining from re-entering the power save mode until one or more data frames are received from the access point responsive to the delivery trigger frame.

6. The method of claim 1 , wherein the access point is configured to transmit the one or more data frames responsive to the fetch trigger frame.

7. The method of claim 1 , wherein at least one of the one or more data frames is an end of data frame.

8. The method of claim 1 , wherein at least one of the one or more data frames indicates an end of service period.

9. The method of claim 1 , wherein the one or more data frames includes the beacon version number.

10. An apparatus comprising:

a processor; and

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

transmitting a fetch trigger frame from a station to an access point;

entering a power save mode at the station until a determination at the station that a fetch time associated with the station has elapsed, wherein the access point is configured to communicate with one or more other stations during the fetch time; and

in response to the determination, exiting the power save mode and receiving one or more data frames from the access point at the station after exiting the power save mode;

wherein the operations comprise receiving from the access point, in response to the fetch trigger frame, a particular frame that includes a beacon version number.

11. The apparatus of claim 10 , wherein the fetch time is indicated in the fetch trigger frame.

12. The apparatus of claim 10 , wherein the fetch time is indicated in an acknowledgement frame received in response to the fetch trigger frame or in a beacon frame.

13. The apparatus of claim 10 , wherein the fetch trigger frame comprises a power save poll (PS-Poll) frame or an unscheduled asynchronous power save delivery (U-APSD) frame.

14. The apparatus of claim 10 , wherein the instructions are further executable by the processor to, in response to the determination that the fetch time has elapsed, transmit a delivery trigger frame to the access point and refrain from re-entering the power save mode until one or more data frames are received from the access point responsive to the delivery trigger frame.

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

transmitting a fetch trigger frame from a station to an access point;

entering a power save mode at the station until a determination at the station that a fetch time associated with the station has elapsed, wherein the access point is configured to communicate with one or more other stations during the fetch time; and

in response to the determination, exiting the power save mode and receiving one or more data frames from the access point at the station after exiting the power save mode;

wherein the operations comprise receiving from the access point, in response to the fetch trigger frame, a particular frame that includes a beacon version number.

16. The non-transitory computer-readable medium of claim 15 , wherein the fetch trigger frame comprises a power save poll (PS-Poll) frame or an unscheduled asynchronous power save delivery (U-APSD) frame.

17. The non-transitory computer-readable medium of claim 15 , wherein the instructions, when executed by the computer, further cause the computer to, in response to the determination that the fetch time has elapsed, transmit a delivery trigger frame to the access point and refrain from re-entering the power save mode until one or more data frames are received from the access point responsive to the delivery trigger frame.

18. An apparatus comprising:

means for transmitting a fetch trigger frame from a station to an access point;

means for entering a power save mode at the station until a determination at the station that a fetch time associated with the station has elapsed and for exiting the power save mode in response to the determination, wherein the access point is configured to communicate with one or more other stations during the fetch time; and

means for receiving one or more data frames from the access point at the station after exiting the power save mode;

wherein the means for receiving is configured to receive from the access point, in response to the fetch trigger frame, a particular frame that includes a beacon version number.

19. The apparatus of claim 18 , wherein the fetch time is indicated in the fetch trigger frame.

20. The apparatus of claim 18 , wherein the fetch time is indicated in an acknowledgement frame received in response to the fetch trigger frame or in a beacon frame.