Controlling uplink power based on downlink path loss and configuration indicated by base station

1. A method for uplink power control by a User Equipment (UE) in a wireless communication system, the method comprising:

receiving configuration information including first information indicating a first reference signal for a pathloss calculation, via Radio Resource Control (RRC) signaling;

receiving the first reference signal for the pathloss calculation;

calculating downlink pathloss using the first reference signal;

determining transmission power for an uplink channel based on the calculated downlink pathloss; and

transmitting the uplink channel based on the determined transmission power,

wherein the method further comprises:

receiving update information for updating the first reference signal for the pathloss calculation, via Medium Access Control (MAC) Control Element (CE) signaling,

wherein the update information includes second information indicating a second reference signal for the pathloss calculation, and

wherein the first information is updated to the second information based on the update information.

2. The method of claim 1 , wherein the uplink channel corresponds to a Physical Uplink Control Channel (PUCCH) or a Physical Uplink Shared Channel (PUSCH).

3. The method of claim 1 , wherein each of the first reference signal and the second reference signal corresponds to a Channel State Information (CSI)-RS or a Synchronization Signal/Sequence (SS) block.

4. The method of claim 3 , wherein the configuration information includes a plurality of candidate reference signals for the pathloss calculation, and

wherein one of the plurality of candidate reference signals is indicated based on the first information.

5. The method of claim 4 , wherein the configuration information further includes information related to the number of the plurality of candidate reference signals.

6. The method of claim 4 , wherein, based on that there exists a plurality of uplink channels to be transmitted, the first reference signal is configured independently for each uplink channel resource configuration mapped to each of the plurality of uplink channels.

7. The method of claim 3 , wherein, based on that transmission of the uplink channel is triggered by a downlink channel transmitted through a Control Resource SET (CORESET), the first reference signal corresponds to the CSI-RS or the SS block Quasi-co-Located (QCLed) with the downlink channel transmitted through the CORESET.

8. The method of claim 3 , wherein the first information comprises an index of the first reference signal.

9. The method of claim 8 , further comprising:

receiving a plurality of parameter set configurations related to the uplink power control, wherein each of the plurality of parameter set configurations is identified by an identifier.

10. The method of claim 1 , wherein before the UE is provided the first information via RRC signaling, a downlink reference signal associated with a specific Control Resource SET (CORESET) is used for the pathloss calculation.

11. The method of claim 1 , further comprising:

based on that a beam change indication for a base station is received, increasing the transmission power of the uplink channel as much as the amount of preconfigured power.

12. The method of claim 1 , wherein before the UE is provided the first information via RRC signaling, the downlink pathloss is calculated based on a specific Synchronization Signal/Sequence (SS) block.

13. A User Equipment (UE) configured to perform uplink power control in a wireless communication system, the UE comprising:

a Radio Frequency (RF) unit; and

a processor configured to control the RF unit, wherein the processor is further configured to:

receive configuration information including first information indicating a first reference signal for a pathloss calculation, via Radio Resource Control (RRC) signaling;

receive the first reference signal for the pathloss calculation;

calculate downlink pathloss using the first reference signal;

determine transmission power for an uplink channel based on the calculated downlink pathloss; and

transmit the uplink channel based on the determined transmission power,

wherein the processor is further configured to:

receive update information for updating the first reference signal for the pathloss calculation, via Medium Access Control (MAC) Control Element (CE) signaling,

wherein the update information includes second information indicating a second reference signal for the pathloss calculation, and

wherein the first information is updated to the second information based on the update information.

14. A method for uplink power control in a wireless communication system, the method performed by a base station and comprising:

transmitting, to a user equipment (UE), configuration information including first information indicating a first reference signal for a pathloss calculation, via Radio Resource Control (RRC) signaling;

transmitting, to the UE, the first reference signal for the pathloss calculation; and

receiving, from the UE, an uplink channel based on the uplink power control,

wherein the method further comprises:

transmitting, to the UE, update information for updating the first reference signal for the pathloss calculation, via Medium Access Control (MAC) Control Element (CE) signaling,

wherein the update information includes second information indicating a second reference signal for the pathloss calculation, and

wherein the first information is updated to the second information based on the update information.