Power Headroom Report Rules

A wireless device comprising:

• one or more processors;
• and
• memory storing instructions that, when executed by the one or more processors, cause the wireless device to:
• receive one or more radio resource control (RRC) messages comprising one or more configuration parameters for an uplink bandwidth part (BWP) of a serving cell, wherein the one or more configuration parameters comprise a pathloss reference list parameter indicating a list of pathloss reference reference signals (RSs), and wherein:
• each pathloss reference RS in the list of pathloss reference RSs indicates a respective reference signal for pathloss estimation;
• and
• a pathloss reference RS in the list of pathloss reference RSs comprises a reference signal parameter indicating, as a pathloss RS, an SSB associated with a second physical cell identifier (PCI) different from a first PCI of the serving cell;
• trigger a power headroom report (PHR);
• compute, for the serving cell and based on a reference physical uplink shared channel (PUSCH) transmission, a Type 1 PHR using a pathloss estimate of the pathloss RS;
• and
• transmit, in a PHR medium-access control (MAC) control element (CE), the Type 1 PHR, wherein the PHR MAC CE comprises a field with a value indicating that the reference PUSCH transmission is used for the Type 1 PHR.

A non-transitory computer-readable medium comprising instructions that, when executed by one or more processors of a wireless device, cause the wireless device to:

• receive one or more radio resource control (RRC) messages comprising one or more configuration parameters for an uplink bandwidth part (BWP) of a serving cell, wherein the one or more configuration parameters comprise a pathloss reference list parameter indicating a list of pathloss reference reference signals (RSs), and wherein:
• each pathloss reference RS in the list of pathloss reference RSs indicates a respective reference signal for pathloss estimation;
• and
• a pathloss reference RS in the list of pathloss reference RSs comprises a reference signal parameter indicating, as a pathloss RS, an SSB associated with a second physical cell identifier (PCI) different from a first PCI of the serving cell;
• trigger a power headroom report (PHR);
• compute, for the serving cell and based on a reference physical uplink shared channel (PUSCH) transmission, a Type 1 PHR using a pathloss estimate of the pathloss RS;
• and
• transmit, in a PHR medium-access control (MAC) control element (CE), the Type 1 PHR, wherein the PHR MAC CE comprises a field with a value indicating that the reference PUSCH transmission is used for the Type 1 PHR.