Power save method and station device

1. A power save method comprising:

receiving, by a station (STA), a null data packet announcement (NDPA) frame in a current transmission opportunity (TXOP) from an access point (AP), wherein the NDPA frame carries a PARTIAL_AID and a transmission opportunity_power save_not_allowed (TXOP_PS_NOT_ALLOWED), the PARTIAL_AID is zero, the TXOP_PS NOT_ALLOWED is zero;

obtaining an STA association identifier (AID) from an STA information field of the NDPA frame;

comparing, by the STA, an STA AID corresponding to the STA with the obtained STA AID from the STA information field of the NDPA frame;

determining whether the STA AID corresponding to the STA is the same as the obtained STA AID;

when the STA AID corresponding to the STA is determined to be different from the obtained STA AID, allowing the STA to enter a doze state until an end of the current TXOP; and

when the STA AID corresponding to the STA is determined to be the same as the obtained STA AID, returning, by the STA, channel state information (CSI) to the AP.

2. The power save method according to claim 1 , wherein before the obtaining, the method comprises:

performing, by the STA, physical layer parsing on the NDPA frame, and obtaining an instruction for allowing TXOP power save.

3. The power save method according to claim 2 , wherein the NDPA frame is not a first frame of a very high throughput (VHT) format of the current TXOP, and wherein, before the obtaining, the method comprises:

performing, by the STA, physical layer parsing on a previous frame, and obtaining an instruction for not allowing TXOP power save.

4. The power save method according to claim 1 , further comprising:

receiving, by the STA, a beacon frame sent by the AP, and

obtaining an instruction from the beacon frame for allowing a basic service set where the STA is located to perform TXOP power save.

5. The power save method according to claim 4 , wherein obtaining the instruction from the beacon frame for allowing a basic service set where the STA is located to perform TXOP power save comprises:

obtaining, by the STA, a value of a bit for identifying very high throughput transmission opportunity power save (VHT TXOP PS) in the beacon frame, wherein the value of the bit is 1.

6. A station device, comprising:

a receiver, configured to (a) receive a null data packet announcement (NDPA) frame in a current transmission opportunity (TXOP) from an access point (AP), wherein the NDPA frame carries a PARTIAL_AID and a transmission opportunity_power save_not_allowed (TXOP_PS_NOT_ALLOWED) and the PARTIAL_AID and the TXOP_PS_NOT_ALLOWED are zero and (b) obtain a station (STA) association identifier (AID) from an STA information field of the NDPA frame;

a processor, configured to compare an STA AID of the station device with the obtained STA AID from the STA information field of the NDPA frame, and determine whether the STA AID of the station device is the same as the obtained STA AID; and

a transmitter, configured to (a) allow the station device to enter a doze state until an end of the current TXOP when the processor determines that the STA AID of the station device is not the same as the obtained STA AID and (b) return channel state information (CSI) to the AP when the STA AID of the station device is the same as the obtained STA AID.

7. The station device according to claim 6 , further comprising:

the receiver is further configured to perform physical layer parsing on the NDPA frame, and obtain an instruction for allowing TXOP power save.

8. The station device according to claim 7 , further comprising:

the receiver is further configured to perform, when the NDPA frame is not a first frame of a very high throughput (VHT) format of the current TXOP, physical layer parsing on a previous frame of the VHT format of the NDPA frame, and obtain an instruction for not allowing TXOP power save.

9. The station device according to claim 6 , further comprising:

the receiver is further configured to receive a beacon frame sent by the AP, and obtain an instruction from the beacon frame for allowing a basic service set where the station device is located to perform TXOP power save.

10. The station device according to claim 9 , wherein the receiver is further configured to obtain a value of a bit for identifying very high throughput transmission opportunity power save (VHT TXOP PS) in the beacon frame, wherein the value of the bit is 1.

11. A non-transitory computer-readable medium having processor-executable instructions stored thereon for saving power for a station (STA), the processor-executable instructions comprising instructions for:

receiving a null data packet announcement (NDPA) frame in a current transmission opportunity (TXOP) from an access point (AP), wherein the NDPA frame carries a PARTIAL_AID and a transmission opportunity_power save_not_allowed (TXOP_PS_NOT_ALLOWED), the PARTIAL_AID is zero, the TXOP_PS_NOT_ALLOWED is zero;

obtaining an STA association identifier (AID) from an STA information field of the NDPA frame;

comparing an STA AID corresponding to the STA with the obtained STA AID from the STA information field of the NDPA frame;

determining whether the STA AID corresponding to the STA is the same as the obtained STA AID; and

when the STA AID corresponding to the STA is different from the obtained STA AID, allowing the STA to enter a doze state until an end of the current TXOP and when the STA AID corresponding to the STA is the same as the obtained STA AID, returning channel state information (CSI) to the AP.

12. The non-transitory computer-readable medium of claim 11 , having processor-executable instructions stored thereon for saving power for a station (STA) further comprising:

performing physical layer parsing on the NDPA frame, and obtaining an instruction for allowing TXOP power save.

13. The non-transitory computer-readable medium of claim 11 , having processor-executable instructions stored thereon for saving power for a station (STA) further comprising:

receiving a beacon frame sent by the AP, and

obtaining an instruction from the beacon frame for allowing a basic service set where the STA is located to perform TXOP power save.