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 coupled to the one or more memories , the one or more processors 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 in response to the trigger frame , the uplink frame 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 is based on the trigger frame , and wherein a time duration in the HE-SIG-A field of the uplink frame is based on the trigger frame , wherein the second content is information associated with a transmission opportunity, TXOP, duration; and providing the uplink frame for processing. one or more memories ; and one or more processors coupled to the one or more memories , the one or more processors 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 in response to the trigger frame , the uplink frame 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 is based on the trigger frame , and wherein a time duration in the HE-SIG-A field of the uplink frame is based on the trigger frame , wherein the second content is information associated with a transmission opportunity, TXOP, duration; and providing the uplink frame 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 in response to the trigger frame , the uplink frame 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 is based on the trigger frame , and wherein a time duration in the HE-SIG-A field of the uplink frame is based on the trigger frame , wherein the second content is information associated with a transmission opportunity, TXOP, duration; and providing the uplink frame for processing. <EOS>