Patent ID: 9729367
Date: 2017-08-08
CPC Classifications: H04B,H04L,H04W

Claim:
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.