Uplink phase tracking reference signals for multiple transmitters on uplink shared channels

Abstract

Methods, systems, and devices for wireless communications are described. The described techniques provide for phase tracking reference signal (PTRS) antenna port configuration and use to support a number of transmission layers (e.g., up to eight transmission layers). In some examples, a user equipment (UE) may be able to support up to four PTRS antenna ports. The UE may transmit capability signaling indicating a number of supported PTRS antenna ports (e.g., up to 4). The network entity may transmit control signaling indicating a number of PTRS antenna ports and a mapping between the PTRS antenna ports and other ports (e.g., sounding reference signal (SRS) ports or demodulation reference signal (DMRS) ports). In some examples, the UE may also indicate a requested number of PTRS antenna ports (e.g., which may be the same as or less than the supported number of PTRS antenna ports).

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