Method of sounding a terminal in a wireless communication system and apparatus therefor
One embodiment according to the present invention, with respect to a sounding method of user equipment (UE) in a wireless communication system, comprises the steps of: receiving configuration of one or more sounding reference signal (SRS) resource sets from a base station; receiving, from the base station, activation command information commanding the SRS transmission activation of a particular SRS resource set from among the one or more SRS resource sets; and transmitting, to the base station, the SRS corresponding to the particular SRS resource set, wherein the reference signal, for which a spatial relationship is assumed for each SRS resource included in the particular SRS resource set, can be determined on the basis of the activation command information.
1. A method for transmitting, by a user equipment (UE), a sounding reference signal (SRS) in a wireless communication system, the method comprising:
receiving, from a base station, a configuration for aperiodic SRS transmission, via radio resource control (RRC) signaling,
wherein the configuration includes (i) first information for a slot offset between downlink control information(DCI) triggering an aperiodic SRS and transmission of the aperiodic SRS and (ii) second information for association between a code point of the DCI triggering the aperiodic SRS and each SRS resource set,
wherein each SRS resource set includes one or more SRS resources, and
wherein the first information for the slot offset is configured for each SRS resource set;
receiving, from the base station, the DCI triggering the aperiodic SRS in a first slot,
wherein the DCI triggering the aperiodic SRS includes a field for triggering of a SRS resource set,
wherein a specific code point is configured by the field, and
wherein a specific SRS resource set associated with the specific code point based on the second information is triggered based on the specific code point; and
transmitting, to the base station, the aperiodic SRS in the specific SRS resource set in a second slot,
wherein the second slot is determined based on a slot-offset related with the specific SRS resource set and the first slot.
2. The method of claim 1 , further comprising:
receiving an SRS resource indicator (SRI) related to a specific SRS resource for uplink transmission of the UE,
wherein a plurality of SRS transmissions based on the specific SRS resource are performed prior to reception of the SRI, and
wherein the SRI is associated with a most recent SRS transmission among the plurality of SRS transmissions.
3. The method of claim 1 , wherein a symbol location in the second slot for the aperiodic SRS is configured per each SRS resource of the specific SRS resource set.
4. The method of claim 1 , wherein information related to a frequency hopping of the aperiodic SRS is configured per each SRS resource of the specific SRS resource set.
5. The method of claim 1 ,
wherein the configuration further includes information for a spatial relation between the aperiodic SRS and a reference signal,
wherein the information for the spatial relation is configured for each of the one or more SRS resources, and
wherein the aperiodic SRS is transmitted based on the spatial relation.
6. The method of claim 5 , further comprising:
receiving, from the base station, update information for the spatial relation, via MAC CE,
wherein the spatial relation is updated based on the update information and updated spatial relation is applied to the aperiodic SRS.
7. The method of claim 6 ,
wherein the reference signal is updated to another reference signal.
8. A user equipment (UE) configured to operate in a wireless communication system, the UE comprising:
a transceiver;
at least one processor; and
at least one computer memory operably connectable to the at least one processor and storing instructions that, based on being executed by the at least one processor, to perform operations comprising:
receiving, from a base station through the transceiver, a configuration for aperiodic SRS transmission, via radio resource control (RRC) signaling,
wherein the configuration includes (i) first information for a slot offset between downlink control information (DCI) triggering an aperiodic SRS and transmission of the aperiodic SRS and (ii) second information for association between a code point of the DCI triggering the aperiodic SRS and each SRS resource set,
wherein each SRS resource set includes one or more SRS resources, and
wherein the first information of the slot offset is configured for each SRS resource set;
receiving, from the base station through the transceiver, the DCI triggering the aperiodic SRS in a first slot,
wherein the DCI triggering the aperiodic SRS includes a field for triggering a SRS resource set,
wherein a specific code point is configured by the field, and
wherein a specific SRS resource set associated with the specific code point based on the second information is triggered based on the specific code point; and
transmitting, to the base station through the transceiver, the aperiodic SRS in the specific SRS resource set in a second slot,
wherein the second slot is determined based on a slot-offset related with the specific SRS resource set and the first slot.
9. The UE of claim 8 , wherein the operations further comprise:
receiving an SRS resource indicator (SRI) related to a specific SRS resource for uplink transmission of the UE,
wherein a plurality of SRS transmissions based on the specific SRS resource are performed prior to reception of the SRI, and
wherein the SRI is associated with a most recent SRS transmission among the plurality of SRS transmissions.
10. The UE of claim 8 , wherein a symbol location in the second slot for the aperiodic SRS is configured per each SRS resource of the specific SRS resource set.
11. The UE of claim 8 , wherein information related to a frequency hopping of the aperiodic SRS is configured per each SRS resource of the specific SRS resource set.
12. A Base Station (BS) configured to operate in a wireless communication system, the BS comprising:
a transceiver;
at least one processor; and
at least one computer memory operably connectable to the at least one processor and storing instructions that, based on being executed by the at least one processor, perform operations comprising:
transmitting, to a user equipment (UE), a configuration for aperiodic SRS transmission, via radio resource control (RRC) signaling,
wherein the configuration includes (i) first information for a slot offset between downlink control information (DCI) triggering an aperiodic SRS and transmission of the aperiodic SRS and (ii) second information for association between a code point of the DCI triggering the aperiodic SRS and each SRS resource set,
wherein each SRS resource set includes one or more SRS resources, and
wherein the first information of the slot offset is configured for each SRS resource set;
transmitting, to the UE, the DCI triggering the aperiodic SRS in a first slot,
wherein the DCI triggering the aperiodic SRS includes a field for triggering a SRS resource set,
wherein a specific code point is configured by the field,
wherein a specific SRS resource set associated with the specific code point based on the second information is triggered based on the specific code point; and
receiving, from the UE, the aperiodic SRS in the specific SRS resource set in a second slot,
wherein the second slot is determined based on a slot-offset related with the specific SRS resource set and the first slot.
13. The BS of claim 12 , wherein a symbol location for the aperiodic SRS in the second slot is configured per each SRS resource of the specific SRS resource set.
14. The BS of claim 12 , wherein information related to a frequency hopping of the aperiodic SRS is configured per each SRS resource of the specific SRS resource set.