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. An IEEE 802.11 station (STA) comprising:
a transceiver configured to receive, from an access point (AP), a first frame that includes a first uplink transmission time (ULT) associated with the STA during which the STA is permitted to transmit uplink data to the AP;
a processor, coupled to the transceiver, configured to determine whether a wireless medium is available, and to transmit, along with the transceiver, uplink data to the AP when it is determined that the wireless medium is available, wherein on a condition that the processor and transmitter do not transmit uplink data during the first ULT associated with the STA, the processor and transceiver are configured to receive a second frame during the first ULT that includes a modified ULT associated the STA during which the STA is permitted to transmit uplink data to the AP; and
the processor and the transceiver configured to transmit uplink data to the AP during the modified ULT associated with the STA.
2. The STA of claim 1 , wherein the first frame is a power save frame.
3. The STA of claim 1 , wherein the first and second power save frames are multiple receiver aggregate multi-poll/power save aggregation descriptor (MMP/PSAD) frames.
4. The STA of claim 1 , wherein the first frame includes a second uplink transmission time (ULT) associated with a second station (STA).
5. The STA of claim 4 , wherein the second frame includes the second ULT associated with the second STA.
6. The STA of claim 5 , wherein the second ULT received in the second frame is unchanged as compared to the second ULT received in the first frame.
7. The STA of claim 1 , wherein the processor and the transceiver are configured to receive the second frame after a point control function inter-frame spacing (PIFS) period after the start of the first ULT.
8. A method for use in an IEEE 802.11 station (STA), the method comprising:
receiving, from an access point (AP), a first frame that includes a first uplink transmission time (ULT) associated with the STA during which the STA is permitted to transmit uplink data to the AP;
determining whether a wireless medium is available;
transmitting uplink data to the AP when it is determined that the wireless medium is available;
on a condition that it is determined that the wireless medium is not available during the first ULT, not transmitting uplink data during the first ULT associated with the STA, and receiving a second frame during the first ULT that includes a modified ULT associated the STA during which the STA is permitted to transmit uplink data to the AP; and
transmitting uplink data to the AP during the modified ULT associated with the STA.
9. The method of claim 8 , wherein the first frame is a power save frame.
10. The method of claim 8 , wherein the first and second power save frames are multiple receiver aggregate multi-poll/power save aggregation descriptor (MMP/PSAD) frames.
11. The method of claim 8 , wherein the first frame includes a second uplink transmission time (ULT) associated with a second station (STA).
12. The method of claim 11 , wherein the second frame includes the second ULT associated with the second STA.
13. The method of claim 12 , wherein the second ULT received in the second frame is unchanged as compared to the second ULT received in the first frame.
14. The method of claim 8 , further comprising:
receiving the second frame after a point control function inter-frame spacing (PIFS) period after the start of the first ULT.