1. A method, in a wireless device, for maintaining timing associated with uplink transmissions, the method comprising, for each of a plurality of scheduled listen-before-talk (LBT) transmission opportunities:determining whether an error in a current uplink transmission timing, with respect to a reference point based on a downlink timing for a reference cell, exceeds a predetermined threshold;
adjusting the timing associated with uplink transmissions, for each scheduled LBT transmission opportunity for which the error exceeds the predetermined threshold;
performing an LBT assessment to determine whether the wireless device is permitted to transmit in the scheduled LBT transmission opportunity; and
for each scheduled LBT transmission opportunity in which the LBT assessment indicates that the wireless device is not permitted to transmit, reversing any adjustment to the timing associated with uplink transmissions made for that scheduled LBT transmission opportunity.