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 an indication of a first uplink transmission time (ULT) associated with the STA during which the STA is assigned to transmit uplink data to the AP;
a processor, coupled to the transceiver, configured to receive a second frame during the first ULT that includes an indication of a modified ULT associated with the STA during which the STA is assigned 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 to 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 frame includes a second uplink transmission time (ULT) associated with a second STA during which the second STA is assigned to transmit uplink data to the AP.
4. The STA of claim 3 , wherein the second frame includes the second ULT associated with the second STA.
5. The STA of claim 4 , wherein the second ULT received in the second frame is unchanged as compared to the second ULT received in the first frame.
6. 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.
7. The STA of claim 1 , wherein the processor is configured to enter a sleep mode when there is no ULT assigned to the STA.
8. The STA of claim 1 , wherein the processor is configured to receive the second frame on a condition that the STA is unable to gain access to a wireless medium during the first ULT assigned to the STA.
9. 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 an indication of a first uplink transmission time (ULT) associated with the STA during which the STA is assigned to transmit uplink data to the AP;
receiving a second frame during the first ULT that includes an indication of a modified ULT associated with the STA during which the STA is assigned to transmit uplink data to the AP; and
transmitting uplink data to the AP during the modified ULT associated with the STA.
10. The method of claim 9 , wherein the first frame is a power save frame.
11. The method of claim 9 , wherein the first frame includes a second uplink transmission time (ULT) associated with a second STA during which the second STA is assigned to transmit uplink data to the AP.
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 9 , further comprising:
receiving the second frame after a point control function inter-frame spacing (PIFS) period after the start of the first ULT.
15. The method of claim 9 , further comprising:
entering a sleep mode when there is no ULT assigned to the STA.
16. The method of claim 9 , wherein receiving the second frame occurs on a condition that the STA is unable to gain access to a wireless medium during the first ULT assigned to the STA.