User terminal, radio base station, and radio communication method
According to the present invention, communication is carried out using a transmission time interval (TTI) that is suitable for a future radio communication system. A user terminal of the present invention includes a receiving section configured to receive a downlink signal; a transmitting section configured to transmit an uplink signal; and a control section configured to control a transmission time interval (TTI) used in reception of the downlink signal and/or used in transmission of the uplink signal. The control section sets a second transmission time interval (TTI) that is shorter than a 1 ms first transmission time interval (TTI).
1. A terminal comprising:
a receiver that receives a downlink signal;
a transmitter that transmits an uplink signal; and
a processor that controls a period used in reception of the downlink signal and/or used in transmission of the uplink signal,
wherein the processor configures a second period that is shorter than a first period, the first period comprising 14 symbols, and the second period comprising 14 symbols, each symbol in the second period being shorter than each symbol in the first period,
in the case where the second period is used in time division duplex (TDD), the processor aligns a transmission direction in the second period with a transmission direction in the first period based on an uplink-downlink configuration for the first period, and
in the case where the uplink-downlink configuration indicate an uplink symbol and a downlink symbol in the first period, the processor aligns transmission directions of symbols in the second period corresponding to the uplink symbol and the downlink symbol with transmission directions of the uplink symbol and the downlink symbol.
2. The terminal according to claim 1 , wherein a subcarrier spacing of the second period is larger than a subcarrier spacing of the first period.
3. A base station comprising:
a transmitter that transmits a downlink signal;
a receiver that receives an uplink signal; and
a processor that controls a period used in transmission of the downlink signal and/or used in reception of the uplink signal,
wherein the processor configures a second period that is shorter than a first period, the first period comprising 14 symbols, and the second period comprising 14 symbols, each symbol in the second period being shorter than each symbol in the first period,
in the case where the second period is used in time division duplex (TDD), the processor aligns a transmission direction in the second period with a transmission direction in the first period based on an uplink-downlink configuration for the first period, and
in the case where the uplink-downlink configuration indicate an uplink symbol and a downlink symbol in the first period, the processor aligns transmission directions of symbols in the second period corresponding to the uplink symbol and the downlink symbol with transmission directions of the uplink symbol and the downlink symbol.
4. A radio control method for a terminal comprising:
receiving a downlink signal;
transmitting an uplink signal; and
controlling a period used in reception of the downlink signal and/or used in transmission of the uplink signal,
wherein the terminal configures a second period that is shorter than a first period, the first period comprising 14 symbols, and the second period comprising 14 symbols, each symbol in the second period being shorter than each symbol in the first period,
in the case where the second period is used in time division duplex (TDD), the terminal aligns a transmission direction in the second period with a transmission direction in the first period based on an uplink-downlink configuration for the first period, and
in the case where the uplink-downlink configuration indicate an uplink symbol and a downlink symbol in the first period, the terminal aligns transmission directions of symbols in the second period corresponding to the uplink symbol and the downlink symbol with transmission directions of the uplink symbol and the downlink symbol.