Wireless communication method and apparatus for mapping a phase tracking reference signal based on a target modulation and coding scheme index

An apparatus, wherein the apparatus comprises:

• one or more memories configured to store instructions;
• and
• one or more processors coupled to the one or more memories and configured to execute the instructions to cause the apparatus to:
• determine a target modulation and coding scheme (MCS) index when a current MCS index exceeds a threshold, wherein the target MCS index is less than or equal to the threshold;
• and
• map a phase tracking reference signal (PTRS) to one or more symbols or subcarriers based on the target MCS index;
• wherein the threshold is 27 or 28.

A non-transitory computer readable medium, having stored thereon computer executable instructions that when executed by a processor of a computer, control the computer to perform steps comprising:

• determining a target modulation and coding scheme (MCS) index when a current MCS index exceeds a threshold, wherein the target MCS index is less than or equal to the threshold;
• and
• mapping a phase tracking reference signal (PTRS) to one or more symbols or subcarriers based on the target MCS index;
• wherein the threshold is 27 or 28.