Method for transmitting and receiving phase tracking reference signal in wireless communication system, and apparatus therefor

A user equipment (UE) configured to receive a physical downlink shared channel (PDSCH) in a wireless communication system, the UE comprising:

• one or more transceivers;
• one or more processors;
• and
• one or more memories connected to the one or more processors and storing instructions that, based on being executed by the one or more processors, perform operations comprising:
• receiving configuration information via a RRC signaling, wherein the configuration information includes information for a repetition scheme which is related to the PDSCH;
• receiving downlink control information (DCI) for scheduling of the PDSCH,
• wherein the DCI includes (i) a transmission configuration indication (TCI) field and (ii) an antenna port field;
• receiving the PDSCH based on i) the repetition scheme set to a Frequency Division Multiplexing (FDM) scheme and ii) a first TCI state and a second TCI state being indicated by the TCI field,
• receiving a phase tracking reference signal (PTRS) based on a resource element mapping of the PTRS,
• wherein, based on the FDM scheme, non-overlapping frequency domain resources are allocated,
• wherein the non-overlapping frequency domain resources include (i) Physical Resource Blocks (PRBs) assigned to the first TCI state and (ii) PRBs assigned to the second TCI state,
• wherein, based on (i) the repetition scheme set to the FDM scheme, (ii) the first TCI state and the second TCI state being indicated by the TCI field and (iii) one or more demodulation reference signal (DMRS) ports within one code division multiplexing (CDM) group being indicated based on the antenna port field:
• (a) an antenna port of the PTRS is associated with a DMRS port with a lowest index among the one or more DMRS ports, and
• (b) a frequency density of the PTRS is determined based on a number of PRBs related to each of the first TCI state and the second TCI state.

A base station configured to transmit a physical downlink shared channel (PDSCH) in a wireless communication system, the base station comprising:

• one or more transceivers;
• one or more processors;
• and
• one or more memories connected to the one or more processors and storing instructions that, based on being executed by the one or more processors, perform operations comprising:
• transmitting, to a user equipment (UE), configuration information via a RRC signaling, wherein the configuration information includes information for a repetition scheme which is related to the PDSCH;
• transmitting, to the UE, downlink control information (DCI) for scheduling of the PDSCH,
• wherein the DCI includes (i) a transmission configuration indication (TCI) field and (ii) an antenna port field;
• transmitting, to the UE, the PDSCH based on i) the repetition scheme set to a Frequency Division Multiplexing (FDM) scheme and ii) a first TCI state and a second TCI state being indicated by the TCI field
• transmitting a phase tracking reference signal (PTRS) based on a resource element mapping of the PTRS,
• wherein, based on the FDM scheme, non-overlapping frequency domain resources are allocated,
• wherein the non-overlapping frequency domain resources include (i) Physical Resource Blocks (PRBs) assigned to the first TCI state and (ii) PRBs assigned to the second TCI state,
• wherein, based on (i) the repetition scheme set to the FDM scheme, (ii) the first TCI state and the second TCI state being indicated by the TCI field and (iii) one or more demodulation reference signal (DMRS) ports within one code division multiplexing (CDM) group being indicated based on the antenna port field:
• (a) an antenna port of the PTRS is associated with a DMRS port with a lowest index among the one or more DMRS ports, and
• (b) a frequency density of the PTRS is determined based on a number of PRBs related to each of the first TCI state and the second TCI state.