Uplink PPDU transmission

1. A method for a wireless local area network, the method performed by an access point (AP) comprising:

transmitting information about a first basic service set (BSS) color to a station, the first BSS color identifying a BSS managed by the AP;

transmitting a first physical layer protocol data unit (PPDU) to the station, the first PPDU including a second BSS color and a first duration field, wherein the second BSS color matches with the first BSS color and the first PPDU requests a transmission of a second PPDU; and

receiving the second PPDU from the station as a response to the first PPDU, the second PPDU including a second duration field,

wherein the first duration field of the first PPDU indicates an estimated time required to transmit the second PPDU,

wherein the second PPDU does not include any frame that solicits a control response frame to be sent by the AP when a value of the second duration field is set to zero, and

wherein the control response frame includes an acknowledgement frame for acknowledging the second PPDU.

2. The method of claim 1 , wherein the second PPDU includes at least one frame that solicits a control response frame to be sent by the AP when the value of the second duration field is not set to zero.

3. The method of claim 1 , wherein the first PPDU includes a trigger frame for requesting the transmission of the second PPDU when the first BSS color is equal to the second BSS color, the trigger frame including a resource unit allocation and the first duration field, the resource unit allocation indicating at least one resource unit used for the transmission of the second PPDU.

4. The method of claim 3 , wherein the trigger frame further includes information about a modulation and coding scheme for the second PPDU.

5. A device comprising:

a transceiver configured to receive and transmit radio signals; and

a processor coupled with the transceiver and configured to:

control the transceiver to transmit information about a first basic service set (BSS) color to a station, the first BSS color identifying a BSS managed by the device;

control the transceiver to transmit a first physical layer protocol data unit (PPDU) to the station, the first PPDU including a second BSS color and a first duration field, wherein the second BSS color matches with the first BSS color and the first PPDU requests a transmission of a second PPDU; and

control the transceiver to receive the second PPDU from the station as a response to the first PPDU, the second PPDU including a second duration field,

wherein the first duration field of the first PPDU indicates an estimated time required to transmit the second PPDU,

wherein the second PPDU does not include any frame that solicits a control response frame to be sent by the device when a value of the second duration field is set to zero, and

wherein the control response frame includes an acknowledgement frame for acknowledging the second PPDU.

6. The device of claim 5 , wherein the second PPDU includes at least one frame that solicits a control response frame to be sent by the device when the value of the second duration field is not set to zero.

7. The device of claim 5 , wherein the first PPDU includes a trigger frame for requesting a transmission of the second PPDU when the first BSS color is equal to the second BSS color, the trigger frame including a resource unit allocation and the first duration field, the resource unit allocation indicating at least one resource unit used for the transmission of the second PPDU.

8. The device of claim 7 , wherein the trigger frame further includes information about a modulation and coding scheme for the second PPDU.