User terminal and radio communication method
A user terminal includes a control unit that determines, based on at least one of comparison of a time offset with a threshold value between a timing related to a spatial relation of uplink transmission and the uplink transmission and that usage of a sounding reference signal (SRS) resource set for the uplink transmission is a specific usage, one of a transmission control indication (TCI) state or a quasi-co-location (QCL) assumption for downlink transmission and indicated spatial relation information as the spatial relation, and a transmitting unit that performs the uplink transmission by using the spatial relation.
1. A terminal comprising:
a receiving section that receives a medium access control (MAC) control element (CE) indicating a transmission configuration indication (TCI) state for a control resource set; and
a control section that determines, when a higher layer parameter indicating use of default beam for an uplink transmission is configured and spatial relation information applicable for the uplink transmission is not configured, whether a reference signal corresponding to the TCI state is used for a spatial relation for the uplink transmission or not, based on a time from reception of the MAC CE to the uplink transmission.
2. The terminal according to claim 1 , wherein the uplink transmission is a sounding reference signal (SRS), and the SRS uses a resource in an SRS resource set with usage except for beam management.
3. The terminal according to claim 1 , wherein the control resource set is configured with a lowest control resource set ID.
4. The terminal according to claim 2 , wherein the control resource set is configured with a lowest control resource set ID.
5. A radio communication method for a terminal, comprising:
receiving a medium access control (MAC) control element (CE) indicating a transmission configuration indication (TCI) state for a control resource set; and
determining, when a higher layer parameter indicating use of default beam for an uplink transmission is configured and spatial relation information applicable for the uplink transmission is not configured, whether a reference signal corresponding to the TCI state is used for a spatial relation for the uplink transmission or not, based on a time from reception of the MAC CE to the uplink transmission.
6. A base station comprising:
a transmitting section that transmits a medium access control (MAC) control element (CE) indicating a transmission configuration indication (TCI) state for a control resource set; and
a control section that controls reception of an uplink transmission,
wherein when a higher layer parameter indicating use of default beam for an uplink transmission is configured and spatial relation information applicable for the uplink transmission is not configured, whether a reference signal corresponding to the TCI state is used for a spatial relation for the uplink transmission or not is determined based on a time from reception of the MAC CE to the uplink transmission.
7. A system comprising a terminal and a base station, wherein
the terminal comprises:
a receiving section that receives a medium access control (MAC) control element (CE) indicating a transmission configuration indication (TCI) state for a control resource set; and
a control section that determines, when a higher layer parameter indicating use of default beam for an uplink transmission is configured and spatial relation information applicable for the uplink transmission is not configured, whether a reference signal corresponding to the TCI state is used for a spatial relation for the uplink transmission or not, based on a time from reception of the MAC CE to the uplink transmission, and
the base station transmits the MAC CE.