Patent ID: 9642144
Date: 2017-05-02
CPC Classifications: H04B,H04L,H04W

Claim:
1. A method of receiving a data unit in a Wireless LAN (WLAN) system, comprising: receiving, by an Access Point (AP), control information from each of a plurality of stations (STAs) indicating whether a corresponding station (STA) supports uplink multi-user transmission; receiving, by the AP, access category (AC) information from each of the plurality of STAs indicating an AC of uplink traffic for a corresponding STA; configuring, by the AP, a signal protection frame requesting uplink multi-user transmission, wherein recipients of the signal protection frame are determined by the AP based on the control information, wherein radio resources used for the uplink multi-user transmission are determined by the AP based on the access category (AC) information, and wherein the signal protection frame indicates the recipients of the signal protection frame, spatial streams allocated for the recipients of the signal protection frame, and a time duration used for the uplink multi-user transmission; transmitting, by the AP, a downlink physical layer protocol data unit (PPDU) comprising the signal protection frame to the recipients of the signal protection frame; and simultaneously receiving, by the AP, uplink PPDUs from the recipients of the signal protection frame using the radio resources, wherein each of the uplink PPDUs comprise a preamble field including a Short Training Field (STF) and a Long Training Field (LTF).