User terminal and radio communication method

A radio communication method for a terminal, the radio communication method comprising:

• determining, a quasi-co-location (QCL) assumption of an aperiodic channel state information-reference signal (AP-CSI-RS), based on a control resource set (CORESET) corresponding to a lowest CORESET-ID among CORESET-IDs in a slot in which one or more CORESETs are monitored, in a case where:
• (1) a scheduling offset between reception of a downlink control channel for communicating downlink control information scheduling the AP-CSI-RS and reception of the AP-CSI-RS is less than a value of reported beam switch timing, and the reported beam switch timing is any of 14, 28 and 48, and
• (2) in a symbol identical to a symbol of the AP-CSI-RS, there are no other downlink signals with indicated transmission configuration indication state (TCI state) and in a symbol identical to a symbol of the AP-CSI-RS, there is at least one of:
• a physical downlink shared channel (PDSCH) having a scheduling offset of less than a threshold;
• and an AP-CSI-RS having a scheduling offset of less than the value of beam switch timing;
• and
• receiving the AP-CSI-RS by using the QCL assumption.

A base station comprising:

• a transmitting section that transmits, to a terminal, an aperiodic channel state information-reference signal (AP-CSI-RS);
• and
• a control section that assumes that, the terminal determines a quasi-co-location (QCL) assumption of the AP-CSI-RS, based on a control resource set (CORESET) corresponding to a lowest CORESET-ID among CORESET-IDs in a slot in which one or more CORESETs are monitored, in a case where:
• (1) a scheduling offset between reception of a downlink control channel for communicating downlink control information scheduling the AP-CSI-RS and reception of the AP-CSI-RS is less than a value of reported beam switch timing, and the reported beam switch timing is any of 14, 28 and 48, and
• (2) in a symbol identical to a symbol of the AP-CSI-RS, there are no other downlink signals with indicated transmission configuration indication state (TCI state) and in a symbol identical to a symbol of the AP-CSI-RS, there is at least one of:
• a physical downlink shared channel (PDSCH) having a scheduling offset of less than a threshold;
• and an AP-CSI-RS having a scheduling offset of less than the value of beam switch timing.

A system comprising a base station and a terminal, wherein

• the base station comprises:
• a transmitting section that transmits an aperiodic channel state information-reference signal (AP-CSI-RS);
• and
• the terminal comprises:
• a control section that determines, a quasi-co-location (QCL) assumption of the AP-CSI-RS, based on a control resource set (CORESET) corresponding to a lowest CORESET-ID among CORESET-IDs in a slot in which one or more CORESETs are monitored, in a case where:
• (1) a scheduling offset between reception of a downlink control channel for communicating downlink control information scheduling the AP-CSI-RS and reception of the AP-CSI-RS is less than a value of reported beam switch timing, and the reported beam switch timing is any of 14, 28 and 48, and
• (2) in a symbol identical to a symbol of the AP-CSI-RS, there are no other downlink signals with indicated transmission configuration indication state (TCI state) and in a symbol identical to a symbol of the AP-CSI-RS, there is at least one of:
• a physical downlink shared channel (PDSCH) having a scheduling offset of less than a threshold;
• and an AP-CSI-RS having a scheduling offset of less than the value of beam switch timing;
• and
• a receiving section that receives the AP-CSI-RS by using the QCL assumption.