Method and device for processing uplink signal in WLAN system
First Claim
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1. A method for processing, by an access point (AP), uplink (UL) signals in a wireless local area network (WLAN) system, the method comprising:
- receiving a request to send (RTS) frame from a first station (STA) among a plurality of STAs;
transmitting an UL spacetime division multiple access (SDMA) control frame to the first STA,wherein the UL SDMA control frame includes a second group identifier (ID) of a second group to which a second STA that will be allowed to perform UL multi-user (MU) multiple-input multiple-output (MIMO) transmission belongs, among first group IDs of first groups to which the first STA belongs;
transmitting a group ID management frame to the first STA and the second STA, wherein the group ID management frame indicates locations of spatial streams to be used by the first STA and the second STA in the second group,wherein the group ID management frame includes a membership field for each of the first groups and a preamble sequence field for each of the first groups;
receiving a first UL signal from the first STA and a second UL signal from the second STA,wherein the first UL signal and the second UL signal are transmitted simultaneously by using a constant amplitude zero auto-correlation (CAZAC) sequence which is used as a training sequence, wherein different training sequences are used for the first UL signal and the second UL signal; and
processing the first UL signal and the second UL signal.
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Abstract
Provided are a method and device for processing an uplink (UL) signal in a WLAN system. An access point (AP) receives a request to send (RTS) frame from one station (STA) among a plurality of STAs, transmits a group identifier (ID) of a group to which STAs for performing UL multi user multiple-input multiple-output (MU-MIMO) transmission together with the one STA, among group IDs of a group to which the one STA belongs, and receives UL signals from the STAs which perform the UL MU-MIMO transmission such that the received UL signals are processed.
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11 Claims
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1. A method for processing, by an access point (AP), uplink (UL) signals in a wireless local area network (WLAN) system, the method comprising:
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receiving a request to send (RTS) frame from a first station (STA) among a plurality of STAs; transmitting an UL spacetime division multiple access (SDMA) control frame to the first STA, wherein the UL SDMA control frame includes a second group identifier (ID) of a second group to which a second STA that will be allowed to perform UL multi-user (MU) multiple-input multiple-output (MIMO) transmission belongs, among first group IDs of first groups to which the first STA belongs; transmitting a group ID management frame to the first STA and the second STA, wherein the group ID management frame indicates locations of spatial streams to be used by the first STA and the second STA in the second group, wherein the group ID management frame includes a membership field for each of the first groups and a preamble sequence field for each of the first groups; receiving a first UL signal from the first STA and a second UL signal from the second STA, wherein the first UL signal and the second UL signal are transmitted simultaneously by using a constant amplitude zero auto-correlation (CAZAC) sequence which is used as a training sequence, wherein different training sequences are used for the first UL signal and the second UL signal; and processing the first UL signal and the second UL signal. - View Dependent Claims (2, 3, 4, 5, 10)
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6. An access point (AP) for processing uplink (UL) signals in a wireless local area network (WLAN) system, the AP comprising:
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a radio frequency (RF) unit for transmitting or receiving a radio signal; and a processor connected to the RF unit, and configured to; receive a request to send (RTS) frame from a first station (STA) among a plurality of STAs; transmit an UL spacetime division multiple access (SDMA) control frame to the first STA, wherein the UL SDMA control frame includes a second group identifier (ID) of a second group to which a second STA that will be allowed to perform UL multi-user (MU) multiple-input multiple-output (MIMO) transmission belongs, among first group IDs of first groups to which the first STA belongs; transmit a group ID management frame to the first STA and the second STA, wherein the group ID management frame indicates locations of spatial streams to be used by the first STA and the second STA in the second group, wherein the group ID management frame includes a membership field for each of the first groups and a preamble sequence field for each of the first groups; receive a first UL signal from the first STA and a second UL signal from the second STA, wherein the first UL signal and the second UL signal are transmitted simultaneously by using a constant amplitude zero auto-correlation (CAZAC) sequence which is used as a training sequence, wherein different training sequences are used for the first UL signal and the second UL signal; and process the first UL signal and the second UL signal. - View Dependent Claims (7, 8, 9, 11)
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Specification