An uplink transmission can be received in an allocated slot on a first serving cell of a base station, the allocated slot on the first serving cell overlapping with multiple slots on a second serving cell of the apparatus. A first power headroom report can be received for the allocated slot on the first serving cell. A second power headroom report can be received for the second serving cell, where the second power headroom report is for a first slot of the multiple overlapping slots on the second serving cell that fully overlaps with the allocated slot on the first serving cell. The first power headroom report and the second power headroom report can be received in the uplink transmission in the allocated slot on the first serving cell. The first power headroom report and the second power headroom report can be Type 1 power headroom reports.