The present disclosure relates generally to wireless devices (e.g., Internet of Things (IoT) devices) and, more particularly, to improving the capacity of a logical channel such as the Random Access Channel (RACH) to cater to wireless traffic (e.g., IoT traffic). In one embodiment, a wireless device, when deciding to attempt a system access in accordance with the present disclosure, would first select a Training Sequence Code (TSC) based on the device's coverage class and then transmit one or more access request bursts (each including the selected TSC) on a logical channel to a wireless access node.