Methods and apparatus for enhanced power save protocol

1. An apparatus for wireless communication comprising:

a processor configured to generate a trigger frame for transmission from the apparatus to a wireless device;

a transmitter configured to transmit, from the apparatus, to the wireless device, the trigger frame for triggering the wireless device to transmit a buffered unit (BU) request frame; and

a receiver configured to receive the BU request frame, from the wireless device in response to the trigger frame, the BU request frame including additional information from the wireless device.

2. The apparatus of claim 1 , wherein the additional information comprises at least one of: buffer status information, a request for a transmission opportunity (TXOP), or a request for the apparatus to provide updated management information.

3. The apparatus of claim 1 , wherein the trigger frame includes a schedule for the wireless device to transmit the BU request frame, and the processor is further configured to concurrently receive the BU request frame according to the schedule.

4. The apparatus of claim 1 , wherein the trigger frame indicates an access category for transmission of the BU request frame from the wireless device, and the receiver is further configured to receive the BU request frame having the indicated access category.

5. The apparatus of claim 1 , wherein the receiver is further configured to receive the BU request frame from the wireless device via at least one of a multi- user multiple-input multiple-output(MIMO) transmission or a multi-user orthogonal frequency division multiple access (OFDMA) transmission.

6. The apparatus of claim 1 , wherein the processor is further configured to:

generate at least one data message comprising single-user or multi-user data in response to the apparatus receiving the BU request frame; and

provide the at least one data message to the transmitter for transmission to the wireless device.

7. The apparatus of claim 1 , wherein the processor is further configured to:

output a clear-to-transmit frame; and

output a beacon frame comprising an information element (IE) indicating when the apparatus will transmit the clear-to-transmit frame to the wireless device.

8. The apparatus of claim 1 , wherein the processor is further configured to:

output a clear-to-transmit frame; and

output a beacon frame indicating a time M during which the apparatus will not transmit the clear-to-transmit frame to the wireless device.

9. The apparatus of claim 1 , wherein the processor is further configured to output a beacon frame indicating a first time M during which the apparatus will not transmit a clear-to-transmit frame to the wireless device and a second time C during which the wireless device may perform contention after the first time M.

10. A method for wireless communication, comprising:

generating a trigger frame for transmission from an apparatus to a wireless device;

transmitting, from the apparatus, to the wireless device, the trigger frame for triggering the wireless device to transmit a buffered unit (BU) request frame; and

receiving the BU request frame, at the apparatus, from the wireless device in response to the trigger frame, the BU request frame including additional information from the wireless device.

11. The method of claim 10 , wherein the additional information comprises at least one of: buffer status information, a request for a transmission opportunity (TXOP), or a request for the apparatus to provide updated management information.

12. The method of claim 10 , wherein the trigger frame includes a schedule for the wireless device to transmit the BU request frame, and the method further comprises concurrently receiving the BU request frame according to the schedule.

13. The method of claim 10 , wherein the trigger frame indicates an access category for transmission of the BU request frame from the wireless device, and the method further comprises receiving the BU request frame having the indicated access category.

14. The method of claim 10 , wherein the method further comprises receiving the BU request frame from the wireless device via at least one of a multi-user multiple-input multiple-output (MIMO) transmission or a multi-user orthogonal frequency division multiple access (OFDMA) transmission.

15. The method of claim 10 , wherein the method further comprises:

generating at least one data message comprising single-user or multi-user data in response to receiving the BU request frame; and

providing the at least one data message for transmission to the wireless device.

16. The method of claim 10 , wherein the method further comprises:

outputting a clear-to-transmit frame; and

outputting a beacon frame comprising an information element (IE) indicating when the apparatus will transmit the clear-to-transmit frame to the wireless device.

17. The method of claim 10 , wherein the method further comprises:

outputting a clear-to-transmit frame; and

outputting a beacon frame indicating a time M during which the apparatus will not transmit the clear-to-transmit frame to the wireless device.

18. The method of claim 10 , wherein the method further comprises outputting a beacon frame indicating a first time M during which the apparatus will not transmit a clear-to-transmit frame to the wireless device and a second time C during which the wireless device may perform contention after the first time M.

19. An apparatus for wireless communication comprising:

means for generating a trigger frame for transmission from the apparatus to a wireless device;

means for transmitting, from the apparatus, to the wireless device, the trigger frame for triggering the wireless device to transmit a buffered unit (BU) request frame; and

means for receiving the BU request frame, at the apparatus, from the wireless device in response to the trigger frame, the BU request frame including additional information from the wireless device.

20. The apparatus of claim 19 , wherein the additional information comprises at least one of: buffer status information, a request for a transmission opportunity (TXOP), or a request for the apparatus to provide updated management information.

21. The apparatus of claim 19 , wherein the trigger frame includes a schedule for the wireless device to transmit the BU request frame, and the apparatus further comprises means for concurrently receiving the BU request frame according to the schedule.

22. The apparatus of claim 19 , wherein the trigger frame indicates an access category for transmission of the BU request frame from the wireless device, and the apparatus further comprises means for receiving the BU request frame having the indicated access category.

23. The apparatus of claim 19 , wherein the apparatus further comprises means for receiving the BU request frame from the wireless device via at least one of a multi-user multiple-input multiple-output (MIMO) transmission or a multi-user orthogonal frequency division multiple access (OFDMA) transmission.

24. The apparatus of claim 19 , wherein the apparatus further comprises:

means for generating at least one data message comprising single-user or multi-user data in response to receiving the BU request frame; and

means for providing the at least one data message to the means for transmitting for transmission to the wireless device.

25. The apparatus of claim 19 , wherein the apparatus further comprises:

means for outputting a clear-to-transmit frame; and

means for outputting a beacon frame comprising an information element (IE) indicating when the apparatus will transmit the clear-to-transmit frame to the wireless device.

26. The apparatus of claim 19 , wherein the apparatus further comprises:

means for outputting a clear-to-transmit frame; and

means for outputting a beacon frame indicating a time M during which the apparatus will not transmit the clear-to-transmit frame to the wireless device.

27. The apparatus of claim 19 , wherein the apparatus further comprises means for outputting a beacon frame indicating a first time M during which the apparatus will not transmit a clear-to-transmit frame to the wireless device and a second time C during which the wireless device may perform contention after the first time M.

28. A non-transitory computer readable storage medium comprising instructions that when executed cause an apparatus to perform a method of wireless communication, the method comprising:

generating a trigger frame for transmission from the apparatus to a wireless device;

transmitting, from the apparatus, to the wireless device, the trigger frame for triggering the wireless device to transmit a buffered unit (BU) request frame; and

receiving the BU request frame, at the apparatus, from the wireless device in response to the trigger frame, the BU request frame including additional information from the wireless device.

29. The non-transitory computer readable storage medium of claim 28 , wherein the additional information comprises at least one of: buffer status information, a request for a transmission opportunity (TXOP), or a request for the apparatus to provide updated management information.