A device (102; 202; 402) for scheduling one or more trigger frames (104; 206, 208, 214; 406, 408, 416, 422, 428) during a beacon interval, wherein the one or more trigger frames (104; 206, 208, 214; 406, 408, 416, 422, 428) comprise information associated with accessing a communication channel, the device (102; 202; 402) comprising: at least one memory that stores computer-executable instructions ; and at least one processor configured to access the at least one memory , wherein the at least one processor is configured to execute the computer-executable instructions to: determine a beacon frame (104; 204; 404) to be transmitted on the communication channel; determine one or more trigger frames (104; 206, 208, 214; 406, 408, 416, 422, 428) to be transmitted to one or more station devices (120; 222; 440) to notify the one or more station devices (120; 222; 440) of one or more resource units; determine a schedule of the one or more trigger frames (104; 206, 208, 214; 406, 408, 416, 422, 428); set a cascade indication in a first trigger frame of the one or more trigger frames (104; 206, 208, 214; 406, 408, 416, 422, 428) based on the schedule, the cascade indication indicating whether a further trigger frame is to be transmitted, and the one or more trigger frames including one or more random access allocations; cause to send the beacon frame to one or more devices, wherein the beacon frame indicates the first scheduled trigger frame; and cause to send the first trigger frame at a first time instance to the one or more station devices (120; 222; 440). at least one memory that stores computer-executable instructions ; and at least one processor configured to access the at least one memory , determine a beacon frame (104; 204; 404) to be transmitted on the communication channel; determine one or more trigger frames (104; 206, 208, 214; 406, 408, 416, 422, 428) to be transmitted to one or more station devices (120; 222; 440) to notify the one or more station devices (120; 222; 440) of one or more resource units; determine a schedule of the one or more trigger frames (104; 206, 208, 214; 406, 408, 416, 422, 428); set a cascade indication in a first trigger frame of the one or more trigger frames (104; 206, 208, 214; 406, 408, 416, 422, 428) based on the schedule, the cascade indication indicating whether a further trigger frame is to be transmitted, and the one or more trigger frames including one or more random access allocations; cause to send the beacon frame to one or more devices, wherein the beacon frame indicates the first scheduled trigger frame; and cause to send the first trigger frame at a first time instance to the one or more station devices (120; 222; 440). set a cascade indication in a first trigger frame of the one or more trigger frames (104; 206, 208, 214; 406, 408, 416, 422, 428) based on the schedule, the cascade indication indicating whether a further trigger frame is to be transmitted, and the one or more trigger frames including one or more random access allocations; cause to send the beacon frame to one or more devices, wherein the beacon frame indicates the first scheduled trigger frame; and cause to send the first trigger frame at a first time instance to the one or more station devices (120; 222; 440). <EOS>