User terminal and radio communication method

A terminal comprising:

• a processor that controls communication, with a base station, using a plurality of slot formats;
• and
• a transmitter that transmits, to the base station, an uplink (UL) reference signal by using a given time-domain location based on information regarding mapping, provided by higher layer signaling,
• wherein, in response to a use of a predetermined slot format of the plurality of slot formats, the plurality of slot formats being configured to have different transmission directions in units of a given number of symbols, the processor:
• controls not to allocate the UL reference signal, which uses the given time-domain location corresponding to a symbol that is a DL resource in the predetermined slot format, to the symbol, and
• controls the transmitter to transmit the UL reference signal,
• wherein in response to a use of a slot format different from the predetermined slot format, the processor controls to allocate the UL reference signal to a symbol, that is a UL resource, in which the slot format does not include any DL resources, and
• wherein time-domain locations supporting allocation of the UL reference signal, including the given time-domain location used to transmit the UL reference signal, are defined in common for the plurality of slot formats.

A radio communication method in a terminal, comprising:

• controlling communication with a base station by using a plurality of slot formats;
• and
• receiving, from the base station, a downlink (DL) reference signal that is allocated to a given time-domain location based on information regarding mapping, provided by higher layer signaling,
• wherein, in response to a use of a predetermined slot format of the plurality of slot formats, the plurality of slot formats being configured to have different transmission directions in units of a given number of symbols, the terminal:
• determines that the DL reference signal, which is allocated to the given time-domain location corresponding to a symbol that is an uplink (UL) resource in the predetermined slot format, is not allocated to the symbol, and
• controls the receiving to receive the DL reference signal,
• wherein in response to a use of a slot format different from the predetermined slot format, the terminal determines that the DL reference signal is allocated to a symbol, that is a DL resource, in which the slot format does not include any UL resources, and
• wherein time-domain locations supporting allocation of the DL reference signal, including the given time-domain location in which the DL reference signal is allocated, are defined in common for the plurality of slot formats.

A base station comprising:

• a transmitter that provides, by higher layer signaling, information regarding mapping of a downlink (DL) reference signal which is allocated to a given time-domain location;
• and
• a processor that performs a control to allocate the DL reference signal by using a predetermined slot format of a plurality of slot formats, the plurality of slot formats being configured to have different transmission directions in units of a given number of symbols,
• wherein the processor controls not to allocate the DL reference signal to a symbol that is an uplink (UL) resource in the predetermined slot format,
• wherein in response to a use of a slot format different from the predetermined slot format, the processor controls to allocate the DL reference signal to a symbol, that is a DL resource, in which the slot format does not include any UL resources, and controls to transmit the DL reference signal, and
• wherein time-domain locations supporting allocation of the DL reference signal, including the given time-domain location in which the DL reference signal is allocated, are defined in common for the plurality of slot formats.

A system comprising a base station and a terminal, wherein:

• the base station comprises:
• a transmitter that provides, by higher layer signaling, information regarding mapping of a downlink (DL) reference signal which is allocated to a given time-domain location;
• and
• a first processor that performs a control to allocate the DL reference signal by using a predetermined slot format of a plurality of slot formats, the plurality of slot formats being configured to have different transmission directions in units of a given number of symbols,
• wherein the first processor controls not to allocate the DL reference signal to a symbol that is an uplink (UL) resource in the predetermined slot format, and
• wherein in response to a use of a slot format different from the predetermined slot format, the first processor controls to allocate the DL reference signal to a symbol, that is a DL resource, in which the slot format does not include any UL resources, and controls to transmit the DL reference signal, and
• the terminal comprises:
• a second processor that controls communication with the base station using the plurality of slot formats;
• and
• a receiver that receives the DL reference signal based on the information,
• wherein, in response to a use of the predetermined slot format of the plurality of formats, the second processor:
• determines that the DL reference signal, which is allocated to the given time-domain location corresponding to the symbol that is the UL resource in the predetermined slot format, is not allocated to the symbol, and
• controls the receiver to receive the DL reference signal,
• wherein in response to the use of the slot format different from the predetermined slot format, the second processor determines that the DL reference signal is allocated to the symbol, that is the DL resource, in which the slot format does not include any UL resources, and
• wherein time-domain locations supporting allocation of the DL reference signal, including the given time-domain location in which the DL reference signal is allocated, are defined in common for the plurality of slot formats.