User terminal and radio communication method
A terminal is disclosed that includes: a control section that determines, in a case where conditions (1) and (2) below are both satisfied, a quasi-co-location (QCL) assumption of an aperiodic channel state information-reference signal (AP CSI-RS), based on a control resource set (CORESET) having a specific CORESET-ID in a latest slot in which one or more CORESETs are monitored, (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 being less than a value of a period for a reported beam switch, and (2) in a symbol identical to a symbol of the AP-CSI-RS, there being no other downlink signals with indicated transmission configuration indication state (TCI state) or there being other downlink signals without the indicated TCI state; and a receiving section that receives the AP-CSI-RS by using the QCL assumption.
1. A terminal comprising:
a control section that determines, 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
a receiving section that receives the AP-CSI-RS by using the QCL assumption.
2. The terminal according to claim 1 , wherein the other downlink signals with the indicated TCI states are at least one of: a PDSCH having a scheduling offset of equal to or greater than the threshold; an AP-CSI-RS having a scheduling offset of equal to or greater than the value of beam switch timing; a periodic channel state information-reference signal (P-CSI-RS); and a semi-persistent channel state information-reference signal (SP-CSI-RS).
3. 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.
4. 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.
5. 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.