Method and apparatus for wireless communications
Embodiments of a method and an apparatus for wireless communications are disclosed. In an embodiment, a method for wireless communications involves, at a first station (STA), transmitting a first Physical Layer Protocol Data Unit (PPDU) that includes a first frame to a second STA, wherein the first frame indicates a first duration of a second PPDU that is transmitted subsequent to the first PPDU by a single STA, wherein a non-Trigger-Based (non-TB) PPDU format is used for the second PPDU, and wherein the first frame solicits a response frame included as part of the second PPDU, and at the first STA, receiving from the second STA, the second PPDU that includes the response frame.
1. A first station (STA) for wireless communications comprising: a processor configured to,
transmit a first Physical Layer Protocol Data Unit (PPDU) that includes a first frame to a second STA,
wherein the first frame indicates a first duration of a second PPDU that is transmitted subsequent to the first PPDU by the second STA,
wherein a non-Trigger-Based (non-TB) PPDU format is used for the second PPDU,
wherein the first frame solicits a response frame included as part of the second PPDU; and
receive from the second STA, the second PPDU that includes the response frame;
wherein the first STA and a third STA are affiliated with a first MLD (multi-link device) and the second STA and a fourth STA are affiliated with a second MLD;
wherein the third STA transmits another PPDU which solicits another response frame on another link to the fourth STA;
wherein a difference between a transmission end time of the first PPDU and a transmission end time of the other PPDU is within a first predetermined margin; and
wherein a difference between a transmission end time of the response frame to the first PPDU and a transmission end time of the other response frame to the other PPDU is within a second predetermined margin.
2. The first STA of claim 1 ,
wherein the first frame explicitly indicates the first duration of the second PPDU.
3. The first STA of claim 1 ,
wherein the first frame implicitly indicates the first duration of the second PPDU.
4. The first STA of claim 1 ,
wherein an A-Control subfield of a Media Access Control (MAC) header portion of the first frame indicates the first duration of the second PPDU that is transmitted subsequent to the first PPDU by the second STA, and
wherein the non-TB PPDU format is used for the second PPDU.
5. The first STA of claim 1 ,
wherein the first duration of the second PPDU is a maximum allowable duration indicated by a Single Response Scheduling (SRS) control subfield of an A-Control subfield in a MAC header portion of the first frame.
6. The first STA of claim 1 ,
wherein the second STA transmits the second PPDU in response to the reception of the first PPDU, and
wherein a difference between the first duration of the second PPDU indicated by the first PPDU and an actual duration of the second PPDU is less than a threshold value.
7. The first STA of claim 1 ,
wherein the second STA determines a PPDU format for the second PPDU.
8. The first STA of claim 7 ,
wherein the PPDU format for the second PPDU is at least one of a High-Efficiency (HE) PPDU and an Extremely High Throughput (EHT) PPDU.
9. The first STA of claim 1 ,
wherein the second STA determines a Modulation and Coding Scheme (MCS) for the second PPDU that is no greater than the MCS of the first PPDU.
10. The first STA of claim 1 ,
wherein the second STA determines a data rate for the second PPDU that is no greater than the data rate of the first PPDU.
11. The first STA of claim 1 ,
wherein the first STA indicates that the first STA is capable of aligning transmission end times of down-link (DL) PPDUs that are transmitted simultaneously on multiple links to the second STA and up-link (UL) PPDUs that are subsequently scheduled simultaneously on multiple links from the second STA.
12. The first STA of claim 11 ,
wherein at least one of the DL PPDUs transmitted by the first STA includes trigger information.
13. The first STA of claim 11 ,
wherein the DL PPDUs indicate that the first STA intends to continue DL transmissions after receiving the UL PPDUs from the second STA.
14. The first STA of claim 13 ,
wherein the DL PPDUs transmitted after receiving the UL PPDUs from the second STA avoid overlap with subsequent UL PPDUs from the second STA.
15. The first STA of claim 1 ,
wherein the first PPDU includes a Trigger frame and a MAC Protocol Data Unit (MPDU) which solicit a response included in a Trigger-Based (TB) PPDU from the second STA, and
wherein an Acknowledgement (Ack) Policy is set to at least one of a Normal Ack and an Implicit Block Ack Request (BAR) in the first MPDU included in the first PPDU.
16. The first STA of claim 1 ,
wherein the first STA and the third STA are affiliated with the first MLD (multi-link device) and the second STA and the fourth STA are affiliated with the second MLD;
wherein the third STA transmits another PPDU which solicits another response frame on another link to the fourth STA;
wherein the difference between the transmission end time of the first PPDU and the transmission end time of the other PPDU is within the first predetermined margin; and
wherein a difference between a duration of the response frame to the first PPDU and a duration of the other response frame to the other PPDU is within the second predetermined margin.
17. The first STA of claim 1 ,
wherein the first STA and the second STA are compatible with an Institute of Electrical and Electronics Engineers (IEEE) 802.11 protocol.
18. A method for wireless communications, the method comprising:
at a first station (STA), transmitting a first Physical Layer Protocol Data Unit (PPDU) that includes a first frame to a second STA,
wherein the first frame indicates a first duration of a second PPDU that is transmitted subsequent to the first PPDU by a single STA,
wherein a non-Trigger-Based (non-TB) PPDU format is used for the second PPDU, and
wherein the first frame solicits a response frame included as part of the second PPDU; and
at the first STA, receiving from the second STA, the second PPDU that includes the response frame;
wherein the first STA and a third STA are affiliated with a first MLD (multi-link device) and the second STA and a fourth STA are affiliated with a second MLD;
wherein the third STA transmits another PPDU which solicits another response frame on another link to the fourth STA;
wherein a difference between a transmission end time of the first PPDU and a transmission end time of the other PPDU is within a first predetermined margin; and
wherein a difference between a transmission end time of the response frame to the first PPDU and a transmission end time of the other response frame to the other PPDU is within a second predetermined margin.
19. A method for wireless communications, the method comprising:
at a first station (STA), transmitting a first Physical Layer Protocol Data Unit (PPDU) that includes a first frame to a second STA,
wherein the first frame indicates a first duration of a second PPDU that is transmitted subsequent to the first PPDU by a single STA,
wherein a non-Trigger-Based (non-TB) PPDU format is used for the second PPDU, and
wherein the first frame solicits a response frame included as part of the second PPDU; and
at the first STA, receiving from the second STA, the second PPDU that includes the response frame;
wherein the first STA and a third STA are affiliated with a first MLD (multi-link device) and the second STA and a fourth STA are affiliated with a second MLD;
wherein the third STA transmits another PPDU which solicits another response frame on another link to the fourth STA;
wherein a difference between a transmission end time of the first PPDU and a transmission end time of the other PPDU is within a first predetermined margin; and
wherein a difference between a duration of the response frame to the first PPDU and a duration of the other response frame to the other PPDU is within a second predetermined margin.