FIELD: communication.
SUBSTANCE: invention relates to a user terminal and to a radio communication method in mobile communication systems of the next generation. The user terminal, according to the aspect of the present invention, contains a control section made with the possibility of control, during retransmission of an uplink shared channel, of determination of time density of a phase tracking reference signal (hereinafter – PTRS) based on the fact of whether an index of a modulation and coding scheme (MCS) is contained in a range higher than a specific value, and a transmission section made with the possibility of transmission of the specified PTRS signal.
EFFECT: possibility of proper control of PTRS transmission.
5 cl, 13 dwg
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