Associations between antenna ports and port groups

A method for wireless communication, comprising:

• configuring, by a base station, one or more phase-tracking reference signal (PTRS) ports that are associated with one or more antenna port in a number of antenna port groups, wherein one or more antenna ports in an antenna port group share a same PTRS port and wherein the one or more antenna ports comprise Demodulation Reference Signal (DMRS) ports;
• and
• receiving, by the base station, an uplink transmission with a terminal device based on the one or more PTRS ports.

A terminal device, comprising at least one processor configured to cause the terminal device to implement a method, comprising:

• determining, by the terminal device for an uplink transmission, one or more phase-tracking reference signal (PTRS) ports that are associated with one or more antenna ports in a number of antenna port groups, wherein one or more antenna ports in an antenna port group share a same PTRS port and wherein the one or more antenna ports comprise Demodulation Reference Signal (DMRS) ports;
• and
• performing, by the terminal device, the uplink transmission to a base station based on the one or more PTRS ports.