1. A method, by a wireless local area network (WLAN) access point (AP), the method comprising:setting a first duration value in a first duration field of a first multi-user request to send (MU-RTS) frame, wherein the first duration value is based on a clear to send (CTS) timeout value;
setting a second duration value in a second duration field of the first MU-RTS frame, wherein the second duration value is based on a remaining transmission opportunity (TXOP) duration;
addressing the first MU-RTS frame, at least in part, to a first WLAN station (STA);
setting the first duration value in the first duration field of a second MU-RTS frame;
addressing the second MU-RTS frame, at least in part, to a second STA; and
transmitting the first and second MU-RTS frames at a first time.