Phase tracking reference signal port or configuration sharing across multiple physical downlink channels of multiple transmit receive points

A method of wireless communication performed by a user equipment (UE), comprising:

• determining that the UE is to communicate with multiple transmit receive points (TRPs) using a specific multi-TRP mode, wherein the specific multi-TRP mode indicates a number of downlink control information (DCI) communications to be used for scheduling and a number of physical downlink shared channels (PDSCHs) to be scheduled by the number of DCI communications, wherein the number of PDSCHs are transmitted by the multiple TRPs;
• determining whether to use a shared phase tracking reference signal (PTRS) configuration across the number of PDSCHs or separate PTRS configurations for the number of PDSCHs based at least in part on the specific multi-TRP mode;
• and
• selectively using the shared PTRS configuration or the separate PTRS configurations for phase tracking estimation on the number of PDSCHs based at least in part on the determination of whether to use the shared PTRS configuration or the separate PTRS configurations.

A user equipment (UE) for wireless communication, comprising:

• a memory;
• and
• one or more processors operatively coupled to the memory, the memory and the one or more processors configured to:
• determine that a phase tracking reference signal (PTRS) port is to be shared among a plurality of physical downlink shared channels (PDSCHs) transmitted by a plurality of transmit receive points (TRPs);
• receive PTRS pilot signals on one or more PDSCHs of the plurality of PDSCHs;
• and
• use the PTRS pilot signals for phase tracking estimation for the plurality of PDSCHs based at least in part on the determination that the PTRS port is to be shared among the plurality of PDSCHs.

A user equipment (UE) for wireless communication, comprising:

• a memory;
• and
• one or more processors operatively coupled to the memory, the memory and the one or more processors configured to:
• determine that the UE is to communicate with multiple transmit receive points (TRPs) using a specific multi-TRP mode, wherein the specific multi-TRP mode indicates a number of downlink control information (DCI) communications to be used for scheduling and a number of physical downlink shared channels (PDSCHs) to be scheduled by the number of DCI communications, wherein the number of PDSCHs are transmitted by the multiple TRPs;
• determine whether to use a shared phase tracking reference signal (PTRS) configuration across the number of PDSCHs or separate PTRS configurations for the number of PDSCHs based at least in part on the specific multi-TRP mode;
• and
• selectively use the shared PTRS configuration or the separate PTRS configurations for phase tracking estimation on the number of PDSCHs based at least in part on the determination of whether to use the shared PTRS configuration or the separate PTRS configurations.