Method and apparatus for transmission management in a wireless communication system
A method and apparatus may be used in wireless communications. The apparatus may be an access point (AP), and may transmit a power save frame. The power save frame may include one or more Uplink (UL) Transmission Times (ULT)s. The apparatus may determine that a station (STA) did not transmit during its respective ULT. The AP may transmit another power save frame. The other power save frame may include a modified ULT. The modified ULT may be for a STA that did not transmit during its respective ULT. The other power save frame may include an unmodified ULT. The unmodified ULT may be for a STA that did not transmit.
1. A method for use in an access point (AP), the method comprising:
sending a first power save frame that includes a first uplink transmission time (ULT) associated with a first station (STA) and a second uplink transmission time (ULT) associated with a second station (STA);
monitoring a medium during the first ULT;
determining whether the medium is idle for a time duration during the first ULT; and
on a condition that the medium is idle for the time duration during the first ULT, send a second power save frame that repeats the second ULT associated with the second STA and resets the first ULT associated with the first station.
2. The method of claim 1 , wherein
the first power save frame and the second power save frame are Multiple Receiver Aggregate Multi-Poll/Power Save Aggregation Descriptor (MMP/PSAD) frames.
3. The method of claim 1 , wherein the time duration is a point control function inter-frame spacing (PIFS) period.
4. The method of claim 1 , wherein the indication by the second power save frame for the first STA to ignore previous ULT information comprises providing a rescheduled ULT for the first STA.
5. The method of claim 1 , further comprising
sending the second power save frame before the second ULT.
6. The method of claim 1 , further comprising sending the second power save frame during the first ULT.
7. The method of claim 1 , wherein the resetting of the first ULT comprises changing a value of the first ULT.
8. The method of claim 1 , wherein the time duration is less than a duration of the first ULT.
9. A station (STA) comprising:
a transmitter;
a receiver configured to receive a first power save frame that includes a plurality of Uplink (UL) Transmission Times (ULT)s, wherein one of the plurality of ULTs is a scheduled ULT for the STA;
wherein, on a condition that the transmitter does not transmit during the scheduled ULT for the STA, the receiver is further configured to receive a second power save frame that includes a modified ULT for the STA and an unmodified ULT for a STA with a ULT scheduled after the STA; and
wherein the transmitter is configured to transmit packet data based on the modified ULT.
10. The STA of claim 9 , wherein the first power save frame is a Multiple Receiver Aggregate Multi-Poll/Power Save Aggregation Descriptor (MMP/PSAD) frame.
11. The STA of claim 9 , wherein the second power save frame is a Multiple Receiver Aggregate Multi-Poll/Power Save Aggregation Descriptor (MMP/PSAD) frame.
12. An access point (AP) comprising:
a processor configured to:
send a first power save frame that includes a first uplink transmission time (ULT) associated with a first station (STA) and a second uplink transmission time (ULT) associated with a second station (STA);
monitor a medium during the first ULT;
determine whether the medium is idle for a time duration during the first ULT; and
on a condition that the medium is idle for the time duration during the first ULT, send a second power save frame that repeats the second ULT associated with the second STA and resets the first ULT associated with the first station.
13. The AP of claim 12 , wherein the indication by the second power save frame for the first STA to ignore previous ULT information comprises providing a rescheduled ULT for the first STA.
14. The AP of claim 12 , wherein the processor is further configured to send the second power save frame before the second ULT.
15. The AP of claim 12 , wherein the processor is further configured to send the second PSF during the first ULT.
16. The AP of claim 12 , wherein the first power save frame and the second power save frame are Multiple Receiver Aggregate Multi-Poll/Power Save Aggregation Descriptor (MMP/PSAD) frames.
17. The AP of claim 12 , wherein the time duration is a point control function inter-frame spacing (PIFS) period.
18. The AP of claim 12 , wherein the processor being configured to reset the first ULT comprises changing a value of the first ULT.
19. The AP of claim 12 , wherein the time duration is less than a duration of the first ULT.
20. A method for use in a station (STA), the method comprising:
receiving a first power save frame that includes a plurality of scheduled Uplink (UL) Transmission Times (ULT)s, wherein one of the plurality of ULTs is a scheduled ULT for the STA;
receiving, on a condition that the STA does not transmit during the scheduled ULT for the STA, a second power save frame that includes a modified ULT for the STA and an unmodified ULT for a STA with a ULT scheduled after the STA; and
transmitting packet data based on the modified ULT.
21. The method of claim 20 , wherein the first power save frame is a Multiple Receiver Aggregate Multi-Poll/Power Save Aggregation Descriptor (MMP/PSAD) frame.
22. The method of claim 20 , wherein the second power save frame is a Multiple Receiver Aggregate Multi-Poll/Power Save Aggregation Descriptor (MMP/PSAD) frame.