An access point, AP, for facilitating multi-user communication in a wireless network operating in compliance with Institute of Electrical and Electronics Engineers Standard 802.11ax, the access point, AP, comprising: one or more memories; and one or more processors (210, 211, 212, 213, 215, 280, 290) coupled to the one or more memories, the one or more processors (210, 211, 212, 213, 215, 280, 290) configured to cause: generating a trigger frame, wherein the trigger frame is used to allocate resource for an uplink multi-user, UL MU, transmission and to solicit an uplink multi-user, UL MU, transmission from the participating stations in response to the trigger frame, the trigger frame comprising a first content and a second content, wherein the first content is associated with a legacy signal, L-SIG, field of an uplink frame, and the second content is associated with a high efficiency signal-A, HE-SIG-A, field of the uplink frame; providing the trigger frame for transmission; receiving the uplink frame (720, 730, 740, 750) in response to the trigger frame, the uplink frame (720, 730, 740, 750) comprising the L-SIG field and the HE-SIG-A field, wherein a length, e.g. in microseconds, in the L-SIG field of the uplink frame (720, 730, 740, 750) is based on the trigger frame, and wherein a time duration in the HE-SIG-A field of the uplink frame (720, 730, 740, 750) is based on the trigger frame, wherein the second content is information associated with a transmission opportunity, TXOP, duration; and providing the uplink frame (720, 730, 740, 750) for processing. one or more memories; and one or more processors (210, 211, 212, 213, 215, 280, 290) coupled to the one or more memories, the one or more processors (210, 211, 212, 213, 215, 280, 290) configured to cause: generating a trigger frame, wherein the trigger frame is used to allocate resource for an uplink multi-user, UL MU, transmission and to solicit an uplink multi-user, UL MU, transmission from the participating stations in response to the trigger frame, the trigger frame comprising a first content and a second content, wherein the first content is associated with a legacy signal, L-SIG, field of an uplink frame, and the second content is associated with a high efficiency signal-A, HE-SIG-A, field of the uplink frame; providing the trigger frame for transmission; receiving the uplink frame (720, 730, 740, 750) in response to the trigger frame, the uplink frame (720, 730, 740, 750) comprising the L-SIG field and the HE-SIG-A field, wherein a length, e.g. in microseconds, in the L-SIG field of the uplink frame (720, 730, 740, 750) is based on the trigger frame, and wherein a time duration in the HE-SIG-A field of the uplink frame (720, 730, 740, 750) is based on the trigger frame, wherein the second content is information associated with a transmission opportunity, TXOP, duration; and providing the uplink frame (720, 730, 740, 750) for processing. generating a trigger frame, wherein the trigger frame is used to allocate resource for an uplink multi-user, UL MU, transmission and to solicit an uplink multi-user, UL MU, transmission from the participating stations in response to the trigger frame, the trigger frame comprising a first content and a second content, wherein the first content is associated with a legacy signal, L-SIG, field of an uplink frame, and the second content is associated with a high efficiency signal-A, HE-SIG-A, field of the uplink frame; providing the trigger frame for transmission; receiving the uplink frame (720, 730, 740, 750) in response to the trigger frame, the uplink frame (720, 730, 740, 750) comprising the L-SIG field and the HE-SIG-A field, wherein a length, e.g. in microseconds, in the L-SIG field of the uplink frame (720, 730, 740, 750) is based on the trigger frame, and wherein a time duration in the HE-SIG-A field of the uplink frame (720, 730, 740, 750) is based on the trigger frame, wherein the second content is information associated with a transmission opportunity, TXOP, duration; and providing the uplink frame (720, 730, 740, 750) for processing.