A method (900-b) of wireless communication by a user equipment, UE, in communication with a first cell and a second cell, comprising: establishing a first component carrier at the UE associated with the first cell; establishing a second component carrier at the UE associated with the second cell while maintaining the first component carrier; determining a set of logical channel groups having available data for uplink transmission from the UE; associating a first logical channel group from the set of logical channel groups with the first cell, the first logical channel group including one or more logical channels; associating a second logical channel group from the set of logical channel groups with the second cell, the second logical channel group including one or more logical channels; wherein each one of the first and second logical channel groups is associated with a corresponding logical channel group ID, using exclusive mapping avoiding duplication of said logical channel group IDs across said first and second cells; determining a first buffer status value based at least in part on a first amount of the available data associated with the first logical channel group; determining a second buffer status value based at least in part on a second amount of the available data associated with the second logical channel group; transmitting (946-b) a first uplink report to the first cell, the first uplink report based at least in part on the available data; and transmitting a second uplink report to the second cell, the second uplink report based at least in part on the available data; wherein the first uplink report includes the first buffer status value and the second uplink report includes the second buffer status value. establishing a first component carrier at the UE associated with the first cell; establishing a second component carrier at the UE associated with the second cell while maintaining the first component carrier; determining a set of logical channel groups having available data for uplink transmission from the UE; associating a first logical channel group from the set of logical channel groups with the first cell, the first logical channel group including one or more logical channels; associating a second logical channel group from the set of logical channel groups with the second cell, the second logical channel group including one or more logical channels; wherein each one of the first and second logical channel groups is associated with a corresponding logical channel group ID, using exclusive mapping avoiding duplication of said logical channel group IDs across said first and second cells; determining a first buffer status value based at least in part on a first amount of the available data associated with the first logical channel group; determining a second buffer status value based at least in part on a second amount of the available data associated with the second logical channel group; transmitting (946-b) a first uplink report to the first cell, the first uplink report based at least in part on the available data; and transmitting a second uplink report to the second cell, the second uplink report based at least in part on the available data; wherein the first uplink report includes the first buffer status value and the second uplink report includes the second buffer status value.