Method and apparatus for power control offset scaling for coherent joint transmission

An apparatus, comprising:

• at least one processor;
• and
• at least one memory including computer program code,
• the at least one memory and the computer program code configured to, with the at least one processor, cause the apparatus at least to:
• select an integer number N0 of channel state information reference signal (CSI-RS) resources out of an integer number of NTRP network configured CSI-RS resources to a resource set associated with a CSI report configuration, wherein N0<NTRP;
• determine a scaling factor for the resource set, wherein when N0<NTRP, the scaling factor unequal to one;
• determine at least one CSI component comprising one or more of precoder matric indicator, rank indicator or channel quality indicator, based at least in part on an assumption that a ratio of a transmitted energy per resource element (EPRE) of a physical downlink shared channel (PDSCH) signal and a transmitted EPRE of the nth CSI-RS resource is equal to the scaling factor times a power control offset configured for the nth CSI-RS resource of the resource set, wherein integer n∈[1, N0],
• wherein the scaling factor is determined to be equal to N0 divided by NTRP;
• and
• transmit a CSI report to a network comprising the determined at least one CSI component.

A non-transitory computer-readable medium encoded with instructions that, when executed by a processor, cause an apparatus at least to:

• select an integer number N0 of channel state information reference signal (CSI-RS) resources out of an integer number of NTRP network configured CSI-RS resources to a resource set associated with a CSI report configuration, wherein N0<NTRP;
• determine a scaling factor for the resource set, wherein when N0<NTRP, the scaling factor unequal to one;
• determine at least one CSI component comprising one or more of precoder matric indicator, rank indicator or channel quality indicator, based at least in part on an assumption that a ratio of a transmitted energy per resource element (EPRE) of a physical downlink shared channel (PDSCH) signal and a transmitted EPRE of the nth CSI-RS resource is equal to the scaling factor times a power control offset configured for the nth CSI-RS resource of the resource set, wherein integer n∈[1, N0],
• wherein the scaling factor is determined to be equal to N0 divided by NTRP;
• and
• transmit a CSI report to a network comprising the determined at least one CSI component.