Method and device for controlling transmission power of terminal in beamforming system
The present disclosure relates to a communication technique for convergence of a 5G communication system for supporting a higher data transmission rate beyond a 4G system with an IoT technology, and a system therefor. The present disclosure may be applied to an intelligent service (for example, smart home, smart building, smart city, smart car or connected car, health care, digital education, retail business, security and safety-related service, etc.) on the basis of a 5G communication technology and an IoT-related technology. The present invention relates to a method for controlling power of a terminal in a beamforming system and, specifically, provides a method for supporting control of uplink power of a terminal according to a beam change.
1. A method performed by a terminal in a wireless communication system, the method comprising:
receiving, from a base station, a control message configuring a sounding reference signal (SRS) transmission, the control message including parameters associated with SRS transmission power for at least one SRS resource;
receiving, from the base station, downlink control information including information indicating an SRS resource among the at least one SRS resource;
identifying an SRS transmission power for a plurality of symbols of the SRS resource based on the parameters; and
transmitting, to the base station, an SRS in the plurality of symbols of the SRS resource based on the identified SRS transmission power, by using a transmission beam configured by the control message for the SRS resource,
wherein the SRS transmission power is same for the plurality of symbols of the SRS resource.
2. The method of claim 1 ,
wherein the parameters include at least one of a P0 value, an alpha value, or pathloss related information, the P0 value is for obtaining a preset level of received power, and the alpha value is for compensating for pathloss between the base station and the terminal, and
wherein the parameters are applied for the at least one SRS resource.
3. The method of claim 1 ,
wherein the SRS resource is indicated by the information indicating the SRS resource, after an uplink beam management procedure performed between the base station and the terminal using the at least one SRS resource.
4. The method of claim 1 ,
wherein a layer 3 filtering is performed for determining a downlink pathloss value to identify the SRS transmission power, and
wherein the layer 3 filtering is performed by filtering pathloss values determined based on a layer 1 filtering for each beam combination and obtaining an average for a beam combination that satisfies a specific criterion of the filtering.
5. A method performed by a base station in a wireless communication system, the method comprising:
transmitting, to a terminal, a control message configuring a sounding reference signal (SRS) transmission, the control message including parameters associated with SRS transmission power for at least one SRS resource;
transmitting, to the terminal, downlink control information including information indicating an SRS resource among the at least one SRS resource; and
receiving, from the terminal, an SRS in a plurality of symbols of the SRS resource,
wherein a reception of the SRS is based on an SRS transmission power and a transmission beam configured by the control message for the SRS resource, and
wherein the SRS transmission power based on the parameters is same for the plurality of symbols of the SRS resource.
6. The method of claim 5 ,
wherein the parameters include at least one of a P0 value, an alpha value, or pathloss related information, the P0 value is for obtaining a preset level of received power, and the alpha value is for compensating for pathloss between the base station and the terminal, and
wherein the parameters are applied for the at least one SRS resource.
7. The method of claim 5 ,
wherein the SRS resource is indicated by the information indicating the SRS resource, after an uplink beam management procedure performed between the base station and the terminal using the at least one SRS resource.
8. The method of claim 5 ,
wherein a layer 3 filtering is performed by the terminal for determining a downlink pathloss value to identify the SRS transmission power, and
wherein the layer 3 filtering is performed by filtering pathloss values determined based on a layer 1 filtering for each beam combination and obtaining an average for a beam combination that satisfies a specific criterion of the filtering.
9. A terminal in a wireless communication system, the terminal comprising:
a transceiver configured to transmit and receive a signal; and
a controller configured to:
receive, from a base station, a control message configuring a sounding reference signal (SRS) transmission, the control message including parameters associated with SRS transmission power for at least one SRS resource,
receive, from the base station, downlink control information including information indicating an SRS resource among the at least one SRS resource,
identify an SRS transmission power for a plurality of symbols of the SRS resource based on the parameters, and
transmit, to the base station, an SRS in the plurality of symbols of the SRS resource based on the identified SRS transmission power, by using a transmission beam configured by the control message for the SRS resource,
wherein the SRS transmission power is same for the plurality of symbols of the SRS resource.
10. The terminal of claim 9 ,
wherein the parameters include at least one of a P0 value, an alpha value, or pathloss related information, the P0 value is for obtaining a preset level of received power, and the alpha value is for compensating for pathloss between the base station and the terminal, and
wherein the parameters are applied for the at least one SRS resource.
11. The terminal of claim 9 ,
wherein the SRS resource is indicated by the information indicating the SRS resource, after an uplink beam management procedure performed between the base station and the terminal using the at least one SRS resource.
12. The terminal of claim 9 ,
wherein a layer 3 filtering is performed for determining a downlink pathloss value to identify the SRS transmission power, and
wherein the layer 3 filtering is performed by filtering pathloss values determined based on a layer 1 filtering for each beam combination and obtaining an average for a beam combination that satisfies a specific criterion of the filtering.
13. A base station in a wireless communication system, the base station comprising:
a transceiver configured to transmit and receive a signal; and
a controller configured to:
transmit, to a terminal, a control message configuring a sounding reference signal (SRS) transmission, the control message including parameters associated with SRS transmission power for at least one SRS resource,
transmit, to the terminal, downlink control information including information indicating an SRS resource among the at least one SRS resource, and
receive, from the terminal, an SRS in a plurality of symbols of the SRS resource,
wherein a reception of the SRS is based on an SRS transmission power and a transmission beam configured by the control message for the SRS resource, and
wherein the SRS transmission power based on the parameters is same for the plurality of symbols of the SRS resource.
14. The base station of claim 13 ,
wherein the parameters include at least one of a P0 value, an alpha value, or pathloss related information, the P0 value is for obtaining a preset level of received power, and the alpha value is for compensating for pathloss between the base station and the terminal, and
wherein the parameters are applied for the at least one SRS resource.
15. The base station of claim 13 ,
wherein the SRS resource is indicated by the information indicating the SRS resource, after an uplink beam management procedure performed between the base station and the terminal using the at least one SRS resource.
16. The base station of claim 13 ,
wherein a layer 3 filtering is performed by the terminal for determining a downlink pathloss value to identify the SRS transmission power, and wherein the layer 3 filtering is performed by filtering pathloss values determined based on a layer 1 filtering for each beam combination and obtaining an average for a beam combination that satisfies a specific criterion of the filtering.