Power headroom report (phr) triggering and reporting for multiple transmission-reception point (multi-trp) physical uplink shared channel (pusch) repetition operation

A method, comprising:

• receiving, at a user equipment, a configuration for at least two uplink channel pathloss references for uplink channel transmission comprising at least one repetition over at least two uplink paths in a cell;
• and
• performing at least one of:
• receiving, by the user equipment, an indication from a network node of which of the configured at least two uplink channel pathloss references or corresponding sounding reference signal (SRS) resource sets or corresponding SRS resource indicators to use for triggering at least one power headroom report;
• or
• when one power headroom report of the at least one power headroom report is triggered from one of the at least two uplink channel pathloss references, indicating to a network node an association between a power headroom value and related pathloss reference;
• or
• when two power headroom reports of the at least one power headroom report are triggered from the at least two uplink channel pathloss references, indicating to the network node at least one of:
• two power headroom information in the uplink channel transmission with one power headroom value and power headroom value differentiation information, or
• two power headroom values in the uplink channel transmission using two single entry medium access control (MAC) control elements (CEs), or
• one power headroom value in the uplink channel transmission using a single entry MAC CE, wherein one or more other power headroom values are carried using single entry MAC CE via one or more other uplink channel transmissions.

An apparatus, comprising:

• at least one processor;
• and
• at least one memory comprising computer program code,
• the at least one memory and computer program code configured, with the at least one processor, to cause the apparatus at least to:
• receive a configuration for at least two uplink channel pathloss references for uplink channel transmission comprising at least one repetition over at least two uplink paths in a cell;
• and
• perform at least one of:
• receive an indication from a network node of which of the configured at least two uplink channel pathloss references or corresponding sounding reference signal (SRS) resource sets or corresponding SRS resource indicators to use for triggering at least one power headroom report;
• or
• when one power headroom report of the at least one power headroom report is triggered from one of the at least two uplink channel pathloss references, indicate to a network node an association between a power headroom value and related pathloss reference;
• or
• when two power headroom reports of the at least one power headroom report are triggered from the at least two uplink channel pathloss references, indicate to the network node at least one of:
• two power headroom information in the uplink channel transmission with one power headroom value and power headroom values differentiation information, or
• two power headroom values in the uplink channel transmission using two single entry medium access control (MAC) control elements (CEs), or
• one power headroom value in the uplink channel transmission using a single entry MAC CE, wherein one or more other power headroom values are carried using a single entry MAC CE via one or more other uplink channel transmissions.

An apparatus, comprising:

• at least one processor;
• and
• at least one memory comprising computer program code,
• the at least one memory and computer program code configured, with the at least one processor, to cause the apparatus at least to:
• indicate, to a user equipment, a configuration for at least two uplink channel pathloss references for uplink channel transmission comprising at least one repetition over at least two uplink paths in a cell;
• and
• perform at least one of:
• provide, to the user equipment, an indication of which the at least two uplink channel pathloss references or sounding reference signal (SRS) resource set or SRS resource indicator to use for triggering at least one power headroom report;
• or
• when one power headroom report of the at least one power headroom report is triggered from one of the at least two uplink channel pathloss references, receive from the user equipment an association between a power headroom value and related pathloss reference;
• or
• when two power headroom reports of the at least one power headroom report are triggered from the at least two uplink channel pathloss references, receive an indication from the user equipment of at least one of:
• two power headroom information in the uplink channel transmission with one power headroom value and power headroom values differentiation information, or
• two power headroom values in the uplink channel transmission using two single entry medium access control (MAC) control elements (CEs), or
• one power headroom value in the uplink channel transmission using a single entry MAC CE, wherein one or more other power headroom values are carried using a single entry MAC CE via one or more other uplink channel transmissions.