A method comprising: determining a power headroom report for transmission on a physical uplink shared channel resource corresponding to a configured grant; and transmitting the power headroom report on the physical uplink shared channel resource, wherein: determining the power headroom report for an activated serving cell comprises determining whether the power headroom report is based on a real transmission or a reference format based on signaling for configured grants and downlink control information received until a predetermined time before a first uplink symbol of the physical uplink shared channel resource, wherein the predetermined time is a physical uplink shared channel processing time for the configured grant; and the predetermined time is computed based on: a first parameter set to zero; and a subcarrier spacing of an active downlink bandwidth part of a scheduling cell for the configured grant; wherein the predetermined time is a physical uplink shared channel preparation procedure time determined, T proc,2, for the configured grant; wherein the first parameter set to zero corresponds to a switching time, d 2,2, used for calculation of the physical uplink shared channel preparation procedure time of the configured grant; and wherein the subcarrier spacing of the active downlink bandwidth part of the scheduling cell for the configured grant is used as a downlink subcarrier spacing μ DL for calculation of the physical uplink shared channel preparation procedure time of the configured grant. determining a power headroom report for transmission on a physical uplink shared channel resource corresponding to a configured grant; and transmitting the power headroom report on the physical uplink shared channel resource, wherein: determining the power headroom report for an activated serving cell comprises determining whether the power headroom report is based on a real transmission or a reference format based on signaling for configured grants and downlink control information received until a predetermined time before a first uplink symbol of the physical uplink shared channel resource, wherein the predetermined time is a physical uplink shared channel processing time for the configured grant; and the predetermined time is computed based on: a first parameter set to zero; and a subcarrier spacing of an active downlink bandwidth part of a scheduling cell for the configured grant; determining the power headroom report for an activated serving cell comprises determining whether the power headroom report is based on a real transmission or a reference format based on signaling for configured grants and downlink control information received until a predetermined time before a first uplink symbol of the physical uplink shared channel resource, wherein the predetermined time is a physical uplink shared channel processing time for the configured grant; and the predetermined time is computed based on: a first parameter set to zero; and a subcarrier spacing of an active downlink bandwidth part of a scheduling cell for the configured grant; a first parameter set to zero; and a subcarrier spacing of an active downlink bandwidth part of a scheduling cell for the configured grant; wherein the predetermined time is a physical uplink shared channel preparation procedure time determined, T proc,2, for the configured grant; wherein the first parameter set to zero corresponds to a switching time, d 2,2, used for calculation of the physical uplink shared channel preparation procedure time of the configured grant; and wherein the subcarrier spacing of the active downlink bandwidth part of the scheduling cell for the configured grant is used as a downlink subcarrier spacing μ DL for calculation of the physical uplink shared channel preparation procedure time of the configured grant.