Transmit time offset in uplink multi-user multiple input-multiple output system
First Claim
Patent Images
1. An apparatus for an access point (AP) a processor and circuitry to:
- monitor respective transmit powers for a plurality of wireless stations,determine a transmit time offset for a station having a lowest respective transmit power of the plurality of wireless stations,transmit the transmit time offset to the station,receive uplink data from the station, along with uplink data from other stations of the plurality of wireless stations, at a time adjusted by the transmit time offset in accordance with an uplink multiuser multiple input multiple output (UL-MU-MIMO) technique,determine a station, of the plurality of wireless stations, having a highest transmit power, andassign a zero transmit time offset to stations, of the plurality of wireless stations having a respective transmit power within a predetermined power difference from the highest transmit power,wherein transmission of the transmit time offsets and reception of the uplink data occurs within a transmission opportunity (TXOP) obtained by the AP.
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Abstract
A method for transmit time offset in a UL-MU-MIMO system monitors respective transmit powers, over a wireless channel, for a plurality of stations in the system. A respective transmit time offset is determined for each station in response to the respective transmit power of each station. A poll exchange sequence is initiated in which the transmit time offsets are transmitted to each respective station. An access point can then receive data from the stations at times adjusted by the respective transmit time offsets.
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Citations
20 Claims
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1. An apparatus for an access point (AP) a processor and circuitry to:
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monitor respective transmit powers for a plurality of wireless stations, determine a transmit time offset for a station having a lowest respective transmit power of the plurality of wireless stations, transmit the transmit time offset to the station, receive uplink data from the station, along with uplink data from other stations of the plurality of wireless stations, at a time adjusted by the transmit time offset in accordance with an uplink multiuser multiple input multiple output (UL-MU-MIMO) technique, determine a station, of the plurality of wireless stations, having a highest transmit power, and assign a zero transmit time offset to stations, of the plurality of wireless stations having a respective transmit power within a predetermined power difference from the highest transmit power, wherein transmission of the transmit time offsets and reception of the uplink data occurs within a transmission opportunity (TXOP) obtained by the AP. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A non-transitory computer-readable storage medium that stores instructions for execution by processing circuitry of an access point (ALP) in controlling a transmit time of stations, the operations to perform the transmit time control:
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monitor respective transmit powers, over a wireless channel, for a plurality of stations; determine a respective transmit time offset for each station, of the plurality of stations, in response to the respective transmit power of each station wherein a non-zero transmit time offset is assigned to a station having a lowest transmit power of the plurality of stations; transmit a frame to the plurality of stations wherein the frame includes the respective transmit time offsets for each of the stations; receive respective uplink data from the plurality of stations at a time adjusted by the respective transmit time offset in accordance with an uplink multiuser multiple input multiple output (UL-MU-MIMO) technique; determine a station having a highest transmit power of the plurality of stations; and assign a zero transmit time offset to stations, of the plurality of stations, having a respective transmit power within a predetermined power difference from the highest transmit power; wherein transmission of the transmit time offset and reception of the uplink data occurs within a transmission opportunity (TXOP) obtained by the AP. - View Dependent Claims (8)
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9. A method for transmit time offset in a wireless system, the method comprising:
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monitoring respective transmit powers, over a wireless channel, for a plurality of stations; determining a transmit time offset for a station, of the plurality of stations, in response to the respective transmit power of the station, wherein the transmit time offset is a non-zero transmit time offset if the station has the lowest transmit power of the plurality of stations; transmitting the transmit time offset to the station; receiving uplink data from the station, along with uplink data from other stations of the plurality of stations, at a time adjusted by the transmit time offset in accordance with an uplink multiuser multiple input multiple output (UL-MU-MIMO) technique; determining a station having a highest transmit power of the plurality of stations, and assigning a zero transmit time offset to the station having a respective transmit power within a predetermined power difference from the highest transmit power; wherein transmission of the transmit time offsets and reception of the uplink data occurs within a transmission opportunity (TXOP) obtained by the AP. - View Dependent Claims (10, 11, 12, 13)
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14. A method for transmit time offset in a wireless system, the method comprising:
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monitoring respective transmit powers, over a wireless channel, for a plurality of stations; determining a transmit time offset for a station, of the plurality of stations, in response to the respective transmit power of the station by generating a non-zero transmit time offset for the station having a lower transmit power than other stations of the plurality of stations; transmitting the transmit time offset to the station; receiving data from the station at a time adjusted by the transmit time offset in accordance with an uplink multiuser multiple input multiple output (UL-MU-MIMO) technique; determining a station having a highest transmit power of the plurality of stations; and assigning a zero transmit time offset to stations, in the plurality of stations, having a respective transmit power within a predetermined power difference from the highest transmit power.
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15. A high-efficiency station (HE-STA) comprising:
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a memory for storing instructions; and a processor coupled to the memory and configured to receive a first frame, from an access point (AP), comprising a transmit time offset associated with a transmit power of the HE-STA wherein the transmit time offset is a non-zero transmit time offset if the transmit power of the HE-STA is a lowest transmit power of a plurality of HE-STAs and the transmit time offset is a zero transmit time offset if the transmit power of the HE-STA is within a predetermined power difference from a highest transmit power of the plurality of HE-STAs;
to determine a transmit time for transmitting uplink data in response to the frame, the transmit time equal to a nominal transmit time plus the transmit time offset; and
to transmit the uplink data at the transmit time, wherein the transmission of the transmit time offset and the uplink data occurs within a transmission opportunity (TXOP) obtained from the AP. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification