NR PHR design for mmWave deployment

A method of wireless communication, comprising:

• determining, by a user equipment (UE), a time period since a last beam change of one or more serving beams received at the UE from a serving base station;
• measuring, by the UE, a pathloss of a beam-specific layer 3 reference signal on a current serving beam in response to the time period exceeding a minimum time threshold;
• and
• measuring, by the UE, the pathloss of a beam-specific layer 1 reference signal on the current serving beam in response to the time period being below the minimum time threshold.

An apparatus configured for wireless communication, comprising:

• means for determining, by a user equipment (UE), a beam-specific periodic power headroom report (PHR) in response to expiration of a first reporting timer, wherein the UE receives communications from a serving base station over one or more serving beams beamformed by the serving base station;
• means for transmitting, by the UE, the beam-specific periodic PHR to the serving base station;
• means for detecting, by the UE, a report triggering event, wherein the report triggering event includes one or more of:
• a pathloss measured on a current serving beam of the one or more serving beams;
• and
• a serving beam change at the UE;
• means for determining, by the UE, a UE-specific trigger PHR in response to the report triggering event and expiration of a second reporting timer;
• and
• means for transmitting, by the UE, the UE-specific trigger PHR to the serving base station.

An apparatus for wireless communication, the apparatus comprising:

• at least one processor;
• and
• a memory coupled to the at least one processor, wherein the at least one processor is configured to perform operations including:
• determining, by a user equipment (UE), a beam-specific periodic power headroom report (PHR) in response to expiration of a first reporting timer, wherein the UE receives communications from a serving base station over one or more serving beams beamformed by the serving base station;
• transmitting, by the UE, the beam-specific periodic PHR to the serving base station;
• detecting, by the UE, a report triggering event, wherein the report triggering event includes one or more of:
• a pathloss measured on a current serving beam of the one or more serving beams;
• and
• a serving beam change at the UE;
• determining, by the UE, a UE-specific trigger PHR in response to the report triggering event and expiration of a second reporting timer;
• and
• transmitting, by the UE, the UE-specific trigger PHR to the serving base station.

An apparatus for wireless communication, the apparatus comprising:

• at least one processor;
• and
• a memory coupled to the at least one processor, wherein the at least one processor is configured to perform operations including:
• determining, by a user equipment (UE), a time period since a last beam change of one or more serving beams received at the UE from a serving base station;
• measuring, by the UE, a pathloss of a beam-specific layer 3 reference signal on a current serving beam in response to the time period exceeding a minimum time threshold;
• and
• measuring, by the UE, the pathloss of a beam-specific layer 1 reference signal on the current serving beam in response to the time period being below the minimum time threshold.