User terminal and radio communication method
According to one aspect of the present invention, a user terminal has a transmission section that performs UL grant-free transmission, in which UL data is transmitted without a UL transmission command from a radio base station, a receiving section that receives a DL signal that is transmitted from the radio base station in response to the UL grant-free transmission, and a control section that monitors the DL signal in a predetermined range, and controls retransmission of the UL data or transmission of new data, based on the DL signal received.
1. A terminal comprising:
a transmitter that performs UL data transmission without a UL transmission indication; and
a processor that monitors, in a time window, a DL signal and controls retransmission of the UL data based on the DL signal received,
wherein the processor controls application of one of:
intra-slot frequency hopping for the UL data transmission without the UL transmission indication, and
inter-slot frequency hopping for the UL data transmission without the UL transmission indication,
the application is based on information that configures application of the one of:
the intra-slot frequency hopping for the UL data transmission without the UL transmission indication, and
the inter-slot frequency hopping for the UL data transmission without the UL transmission indication, and
the information is transmitted by using higher layer signaling.
2. The terminal according to claim 1 , wherein the DL signal is downlink control information including information that indicates a delivery acknowledgement in response to the UL data.
3. The terminal according to claim 1 , wherein the processor controls the retransmission of the UL data based on a new data indicator (NDI) field included in the DL signal.
4. The terminal according to claim 2 , wherein the processor controls the retransmission of the UL data based on a new data indicator (NDI) field included in the DL signal.
5. The terminal according to claim 1 , wherein the monitoring is monitoring of a Physical Downlink Control Channel (PDCCH) for retransmission indication.
6. The terminal according to claim 2 , wherein the monitoring is monitoring of a Physical Downlink Control Channel (PDCCH) for retransmission indication.
7. The terminal according to claim 3 , wherein the monitoring is monitoring of a Physical Downlink Control Channel (PDCCH) for retransmission indication.
8. A radio communication method for a terminal, comprising:
performing UL data transmission without a UL transmission indication; and
monitoring, in a time window, a DL signal and controlling retransmission of the UL data based on the DL signal received,
wherein the terminal controls application of one of:
intra-slot frequency hopping for the UL data transmission without the UL transmission indication, and
inter-slot frequency hopping for the UL data transmission without the UL transmission indication,
the application is based on information that configures application of the one of:
the intra-slot frequency hopping for the UL data transmission without the UL transmission indication, and
the inter-slot frequency hopping for the UL data transmission without the UL transmission indication, and
the information is transmitted by using higher layer signaling.
9. A system comprising a terminal and a base station, wherein:
the terminal comprises:
a transmitter that performs UL data transmission without a UL transmission indication; and
a processor that monitors, in a time window, a DL signal and controls retransmission of the UL data based on the DL signal received,
the base station comprises:
a receiver that performs reception of the UL data transmission without the UL transmission indication,
wherein the processor controls application of one of:
intra-slot frequency hopping for the UL data transmission without the UL transmission indication, and
inter-slot frequency hopping for the UL data transmission without the UL transmission indication,
the application is based on information that configures application of the one of:
the intra-slot frequency hopping for the UL data transmission without the UL transmission indication, and
the inter-slot frequency hopping for the UL data transmission without the UL transmission indication, and
the information is transmitted by using higher layer signaling.