A station for facilitating communication in a wireless network for a multi-user transmission, the station 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 the station to: process a first trigger frame (1302, 1402) received from an access point, wherein the first trigger frame (1302, 1402) schedules a first uplink multi-user transmission and indicates a first set of resources for indicating existence of data to be sent to the access point, wherein the first set of resources are allocated for random access for a first set of stations of a first random access type and wherein the first set of stations includes the station; and transmit, during the first uplink multi-user transmission to the access point and in response to the first trigger frame (1302, 1402), a first uplink frame (1304, 1404) (i) that has no data field and that has a signal indicating existence of data to be sent from the station to the access point, or (ii) that includes a data field comprising an indication of whether the station has data to send from the station to the access point and/or a buffer status report of the station, wherein the transmitting comprises transmitting the signal on a first resource of the first set of resources. one or more memories; and one or more processors coupled to the one or more memories, the one or more processors configured to cause the station to: process a first trigger frame (1302, 1402) received from an access point, wherein the first trigger frame (1302, 1402) schedules a first uplink multi-user transmission and indicates a first set of resources for indicating existence of data to be sent to the access point, wherein the first set of resources are allocated for random access for a first set of stations of a first random access type and wherein the first set of stations includes the station; and transmit, during the first uplink multi-user transmission to the access point and in response to the first trigger frame (1302, 1402), a first uplink frame (1304, 1404) (i) that has no data field and that has a signal indicating existence of data to be sent from the station to the access point, or (ii) that includes a data field comprising an indication of whether the station has data to send from the station to the access point and/or a buffer status report of the station, wherein the transmitting comprises transmitting the signal on a first resource of the first set of resources. process a first trigger frame (1302, 1402) received from an access point, wherein the first trigger frame (1302, 1402) schedules a first uplink multi-user transmission and indicates a first set of resources for indicating existence of data to be sent to the access point, wherein the first set of resources are allocated for random access for a first set of stations of a first random access type and wherein the first set of stations includes the station; and transmit, during the first uplink multi-user transmission to the access point and in response to the first trigger frame (1302, 1402), a first uplink frame (1304, 1404) (i) that has no data field and that has a signal indicating existence of data to be sent from the station to the access point, or (ii) that includes a data field comprising an indication of whether the station has data to send from the station to the access point and/or a buffer status report of the station, (i) that has no data field and that has a signal indicating existence of data to be sent from the station to the access point, or (ii) that includes a data field comprising an indication of whether the station has data to send from the station to the access point and/or a buffer status report of the station, wherein the transmitting comprises transmitting the signal on a first resource of the first set of resources.