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

A user equipment (UE) receiving a phase tracking reference signal (PTRS) in a wireless communication system, the UE comprising:

• one or more transceivers;
• one or more processors;
• and
• one or more memories configured to store instructions for operations executed by the one or more processors, the one or more memories being connected to the one or more processors,
• wherein the operations comprise:
• receiving configuration information for Physical Downlink Shared Channel (PDSCH),
• wherein the configuration information includes configurations for a plurality of Transmission Configuration Indication states (TCI states), and each TCI state includes parameters for configuring a quasi-co-location (QCL) relationship between a reference signal and the PDSCH;
• receiving PTRS configuration information,
• wherein the PTRS configuration information includes information for a frequency density of the PTRS that includes a first threshold and a second threshold;
• receiving an activation command,
• wherein, based on the activation command, one or more TCI states among the plurality of TCI states are mapped to codepoints of TCI field;
• receiving downlink control information (DCI) for scheduling of the PDSCH;
• wherein the DCI includes the TCI field;
• and
• receiving the PDSCH and the PTRS, based on the DCI,
• wherein the DCI is a single DCI and the TCI field represents a codepoint to which two TCI states are mapped,
• wherein, based on a frequency domain related to a first TCI state not overlapping with a frequency domain resource related to a second TCI state in a frequency resource region assigned based on the single DCI:
• i) the frequency density of the PTRS is determined for each of the two TCI states, and
• ii) the frequency density of the PTRS is determined based on comparing (i) a number of resource blocks related to each of the two TCI states in the frequency resource region assigned based on the single DCI and (ii) at least one of the first threshold or the second threshold.

A method of transmitting, by a base station (BS), a phase tracking reference signal (PTRS) in a wireless communication system, the method comprising:

• transmitting, to a user equipment (UE), configuration information for Physical Downlink Shared Channel (PDSCH),
• wherein the configuration information includes configurations for a plurality of Transmission Configuration Indication states (TCI states), and each TCI state includes parameters for configuring a quasi-co-location (QCL) relationship between a reference signal and the PDSCH;
• transmitting, to the UE, PTRS configuration information,
• wherein the PTRS configuration information includes information for a frequency density of the PTRS that includes a first threshold and a second threshold;
• transmitting, to the UE, an activation command,
• wherein, based on the activation command, one or more TCI states among the plurality of TCI states are mapped to codepoints of TCI field;
• transmitting, to the UE, downlink control information (DCI) for scheduling of the PDSCH;
• wherein the DCI includes the TCI field;
• and
• transmitting, to the UE, the PDSCH and the PTRS, based on the DCI,
• wherein the DCI is a single DCI and the TCI field represents a codepoint to which two TCI states are mapped,
• wherein, based on a frequency domain related to a first TCI state not overlapping with a frequency domain resource related to a second TCI state in a frequency resource region assigned based on the single DCI:
• i) the frequency density of the PTRS is determined for each of the two TCI states, and
• ii) the frequency density of the PTRS is determined based on comparing (i) a number of resource blocks related to each of the two TCI states in the frequency resource region assigned based on the single DCI and (ii) at least one of the first threshold or the second threshold.