User terminal and radio communication method
To appropriately control CSI reporting even in a case of performing CSI reporting by employing a method different from ones for existing LTE systems, one aspect of a user terminal of the present invention includes a transmitting section that transmits channel state information, and a control section that controls transmission of the channel state information by using certain downlink control information indicating trigger and/or activation of channel state information without scheduling data.
1. A terminal comprising:
a receiver that receives downlink control information (DCI); and
a processor that determines, based on a field included in the DCI, whether the DCI is a first DCI that indicates transmission of an uplink data using uplink shared channel, or is a second DCI that indicates at least one of triggering and activation of channel state information reporting, using the uplink shared channel without transmission of the uplink data,
wherein regardless of whether the processor determines that the DCI is the first DCI or determines that the DCI is the second DCI, a same RNTI is used in a CRC mask of the DCI,
wherein a search space for the first DCI and a search space for the second DCI are set to be same, and
wherein the processor performs the transmission of the uplink data when the field is a first value, and performs a transmission of the channel state information without performing the transmission of the uplink data when the field is a second value.
2. The terminal according to claim 1 , wherein the processor controls the transmission of the channel state information, using the uplink shared channel, based on another field included in the DCI.
3. The terminal according to claim 1 , wherein when the processor determines that the DCI is the second DCI, the processor determines whether to activate or deactivate the channel state information based on a plurality of fields included in the DCI.
4. The terminal according to claim 3 , wherein the plurality of fields comprises an HARQ process number reporting field and an RV reporting field.
5. The terminal according to claim 4 , wherein if an aperiodic channel state information reporting is triggered by the first DCI, a RNTI that is used in a CRC mask of the first DCI is different from a RNTI that is used in a CRC mask of the second DCI.
6. The terminal according to claim 3 , wherein if an aperiodic channel state information reporting is triggered by the first DCI, a RNTI that is used in a CRC mask of the first DCI is different from a RNTI that is used in a CRC mask of the second DCI.
7. A radio communication method for a terminal, comprising:
receiving downlink control information (DCI); and
determining, based on a field included in the DCI, whether the DCI is a first DCI that indicates transmission of an uplink data using uplink shared channel, or is a second DCI that indicates at least one of triggering and activation of channel state information reporting, using the uplink shared channel without transmission of the uplink data,
wherein regardless of whether the terminal determines that the DCI is the first DCI or determines that the DCI is the second DCI, a same RNTI is used in a CRC mask of the DCI,
wherein a search space for the first DCI and a search space for the second DCI are set to be same, and
wherein the terminal performs the transmission of the uplink data when the field is a first value, and performs a transmission of the channel state information without performing the transmission of the uplink data when the field is a second value.
8. A base station comprising:
a processor that controls to include a field in downlink control information (DCI) to determine whether the DCI is a first DCI that indicates transmission of an uplink data using uplink shared channel, or is a second DCI that indicates at least one of triggering and activation of channel state information reporting, using the uplink shared channel without transmission of the uplink data; and
a transmitter that transmits the DCI,
wherein regardless of whether the processor determines that the DCI is the first DCI or determines that the DCI is the second DCI, a same RNTI is used in a CRC mask of the DCI,
wherein a search space for the first DCI and a search space for the second DCI are set to be same, and
wherein the processor controls to perform the transmission of the uplink data when the field is a first value, and perform a transmission of the channel state information without performing the transmission of the uplink data when the field is a second value.
9. A system comprising a terminal and a base station, wherein
the terminal comprises:
a receiver that receives downlink control information (DCI); and
a processor of the terminal that determines, based on a field included in the DCI, whether the DCI is a first DCI that indicates transmission of an uplink data using uplink shared channel, or is a second DCI that indicates at least one of triggering and activation of channel state information reporting, using the uplink shared channel without transmission of the uplink data,
wherein regardless of whether the processor determines that the DCI is the first DCI or determines that the DCI is the second DCI, a same RNTI is used in a CRC mask of the DCI,
wherein a search space for the first DCI and a search space for the second DCI are set to be same, and
wherein the processor of the terminal performs the transmission of the uplink data when the field is a first value, and performs a transmission of the channel state information without performing the transmission of the uplink data when the field is a second value, and
the base station comprises:
a processor of the base station that controls to include the field in the DCI to determine whether the DCI is the first DCI or the second DCI; and
a transmitter that transmits the DCI.