Apparatus, method, and computer readable media for uplink transmission opportunity in a high-efficiency wireless local-area network

1. An apparatus of a high-efficiency (HE) station configured to operate in a wireless local-area network (WLAN), the HE station comprising: memory; and circuitry coupled to the memory, the circuitry configured to:

receive a trigger frame from a HE master station, wherein the trigger frame comprises a first duration and a resource map;

determine a second duration based on the first duration;

generate a packet including a field that indicates the second duration, wherein the second duration is indicated in a legacy portion of the packet;

configure the HE station to transmit the packet including the field that indicates the second duration on a channel indicated in the resource map in an uplink transmission opportunity to the master station in accordance with at least one from the following group:

orthogonal frequency division multiple-access (OFDMA) and multiple-user multiple-input multiple-output (MU-MIMO); and

configure the HE station to enter a power saving mode if the packet is a predetermined duration shorter than the second duration.

2. The apparatus of claim 1 , wherein the field that indicates the second duration is one of the following group:

a legacy signal field, media access control duration of a media access control (MAC) Protocol Data Unit (MPDU), and an aggregate MPDU (A-MPDU).

3. The apparatus of claim 1 , wherein the second duration is the first duration minus a duration for a preamble duration, a physical header duration, two short interframe spaces duration, and a multi-user block acknowledgement duration, and wherein the preamble duration is a duration of a preamble of the packet and the physical header duration is a duration of a physical header of the packet.

4. The apparatus of claim 1 , wherein the second duration is determined to extend to one short interframe space before the master station transmits an acknowledgement of the packet.

5. The apparatus of claim 1 , wherein the second duration is determined to extend to an end of a largest duration the packet is permitted to be for the transmission opportunity.

6. The apparatus of claim 1 , wherein the trigger frame is transmitted to a plurality of HEW stations by the master station.

7. The apparatus of claim 1 , wherein the circuitry is further configured to enter a power saving mode after the packet is transmitted and to awake from the power saving mode after the second duration if the packet is the predetermined duration shorter than the second duration.

8. The apparatus of claim 1 , wherein the packet includes a legacy short-training field (L-STF), a legacy long-training field (L-LTF), a legacy signal field (L-SIG), and a media access control duration of an aggregate media access control (MAC) Protocol Data Unit (MPDU).

9. The apparatus of claim 1 , wherein the master station does not know an amount of data the HEW station has to transmit in the packet.

10. The apparatus of claim 1 , wherein the circuitry is further configured to:

transmit with a 4× symbol duration compared with an Institute of Electronic and Electrical Engineers (IEEE) 802.11ac symbol duration.

11. The apparatus of claim 1 , further comprising memory coupled to the circuitry.

12. The apparatus of claim 11 , further comprising one or more antennas coupled to the circuitry.

13. A method performed by an apparatus of a high-efficiency (HE) station, the method comprising:

receiving a trigger frame from a HE master station, wherein the trigger frame comprises a first duration and a resource map;

determining a second duration based on the first duration, wherein the second duration is indicated in a legacy portion of the packet;

configuring the HE station to transmit the packet with the second duration on a channel indicated in the resource map in an uplink transmission opportunity to the master station in accordance with at least one from the following group:

orthogonal frequency division multiple-access (OFDMA) and multiple-user multiple-input multiple-output (MU-MIMO; and

configuring the HE station to enter a power saving mode if the packet is a predetermined duration shorter than the second duration.

14. The method of claim 13 , wherein the second duration is the first duration minus a duration for a preamble length, a physical header duration, two short interframe spaces duration, and a multi-user block acknowledgement duration, wherein the preamble duration is a duration of a preamble of the packet and the physical header duration is a duration a physical header of the packet.

15. The method of claim 13 , wherein the second duration is determined to extend to one short interframe space before the master station transmits an acknowledgement of the packet.

16. The method of claim 13 , wherein the second duration is determined to extend to an end of a largest duration the packet is permitted to be for the transmission opportunity.

17. A non-transitory, computer-readable storage medium that stores instructions for execution by one or more processors to perform operations for communication by an apparatus of a high-efficiency HE station, the instructions to configure the one or more processors to cause the apparatus to:

decode a trigger frame from a HE master station, wherein the trigger frame comprises a first duration and a resource map;

determine a second duration based on the first duration, wherein the second duration is indicated in a legacy portion of the packet;

configure the HE station to transmit the packet with the second duration on a channel indicated in the resource map in an uplink transmission opportunity to the master station in accordance with at least one from the following group:

orthogonal frequency division multiple-access (OFDMA) and multiple-user multiple-input multiple-output (MU-MIMO; and

configure the HE station to enter a power saving mode if the packet is a predetermined duration shorter than the second duration.

18. The non-transitory, computer readable storage medium of claim 17 , wherein the second duration is the first duration minus a duration for a preamble length, a physical header duration, minus two short interframe spaces duration, and a multi-user block acknowledgement duration, wherein the preamble duration is a duration of a preamble of the packet and the physical header duration is a duration a physical header of the packet.