1. A method of wireless communication, comprising:receiving, at a user equipment (UE), a downlink grant from a serving base station, wherein the downlink grant identifies downlink transmission in one or more subsequent communication slots;
identifying, by the UE, a trigger for transmission of a channel usage signal associated with the downlink grant;
transmitting, by the UE, the channel usage signal in a next scheduled uplink region; and
receiving, by the UE, downlink data from the serving base station according to the downlink grant, wherein the channel usage signal is transmitted between the receiving the downlink grant and the receiving the downlink data.