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 Institute of Electrical and Electronics Engineers (IEEE) 802.11 access point (AP), the method comprising:
transmitting a first power save frame that includes a first uplink transmission time (ULT), associated with a first station (STA) and a second ULT associated with a second STA;
monitoring a wireless medium during the first ULT;
determining whether the wireless medium is idle for a time duration during the first ULT; and
on a condition that the wireless medium is idle for the time duration during the first ULT, reclaiming the wireless medium, wherein reclaiming the wireless medium comprises transmitting a second power save frame during the first ULT that comprises an indication to the first STA to transmit during a remaining portion of the first ULT and an indication to the second STA to transmit during the second ULT.
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. 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 wireless medium during the first ULT;
determine whether the wireless medium is idle for a time duration during the first ULT; and
on a condition that the wireless medium is idle for the time duration during the first ULT, reclaim the wireless medium, wherein being configured to reclaim the wireless medium comprises being configured to send a second power save frame during the first ULT that comprises an indication to the first STA to transmit during a remaining portion of the first ULT and an indication to the second STA to transmit during the second ULT.
5. The AP of claim 4 , 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.
6. The AP of claim 4 , wherein the time duration is a point control function inter-frame spacing (PIFS) period.
7. A first station (STA) comprising:
a processor configured to:
receive a first power save frame that includes a first uplink transmission time (ULT) associated with the first station (STA) and a second uplink transmission time (ULT) associated with a second station (STA);
on a condition that the transmitter does not transmit during the first ULT associated with the first STA, receive a second power save frame during the first ULT that comprises an indication to the first STA to transmit during a remaining portion of the first ULT and an indication to the second STA to transmit during the second ULT; and
transmit during the remaining portion of the first ULT.
8. The STA of claim 7 , wherein the first and second power save frames are multiple receiver aggregate multi-poll/power save aggregation descriptor (MMP/PSAD) frames.