Method and apparatus for selecting beam in wireless communication system preliminary class

1. A method of a user equipment (UE) for selecting a beam in an initial access mode of a wireless communication system, the method comprising:

determining a first receive beam parameter including information for a number of receive antennas activated for first beam searching;

receiving, from a base station (BS), a first transmit beam parameter including information for a number of transmit antennas activated for the first beam searching;

receiving a first reference signal (RS) based on the first transmit beam parameter while changing receive beams based on the first receive beam parameter;

selecting, based on the received first RS, a transmit beam and a receive beam for data communication;

determining, based on reference signal receive power (RSRP) of the received first RS, the selecting operation of the transmit beam and the receive beam for the data communication as:

a first mode in which additional beam searching is performed; or

a second mode in which additional beam searching is not performed; and

transmitting, to the BS, information for the selected transmit beam,

wherein the selecting operation of the transmit beam and the receive beam determined as the first mode comprises:

determining a second receive beam parameter including information for a number of receive antennas activated for second beam searching;

receiving, from the BS, a second transmit beam parameter including information for a number of transmit antennas activated for the second beam searching;

receiving, based on the second transmit beam parameter, a second RS identified while changing receive beams based on the second receive beam parameter; and

selecting, based on the received second RS, the transmit beam and the receive beam for the data communication.

2. The method of claim 1 , wherein the number of receive antennas activated for the second beam searching is larger than the number of receive antennas activated for the first beam searching, and

wherein the number of transmit antennas activated for the second beam searching is larger than the number of transmit antennas activated for the first beam searching.

3. The method of claim 1 , wherein the selecting operation of the transmit beam and the receive beam determined as the second mode comprises:

identifying a transmit beam and a receive beam including a larger RSRP value of the received first RS than other transmit beams and receive beams; and

selecting the transmit beam and the receive beam for the data communication based on the identified transmit beam and receive beam and a preconfigured artificial intelligence (AI) algorithm.

4. The method of claim 1 , wherein the first receive beam parameter further comprises information for a number of candidate receive beams for the first beam searching, and

wherein the first transmit beam parameter further comprises information for a number of candidate transmit beams for the first beam searching.

5. A method of a base station (BS) for selecting a beam in an initial access mode of a wireless communication system, the method comprising:

determining a first transmit beam parameter including information for a number of transmit antennas activated for first beam searching;

transmitting, to a user equipment (UE), the determined first transmit beam parameter;

transmitting, to the UE, a first reference signal (RS) based on the first transmit beam parameter, while changing transmit beams;

receiving, from the UE, information for a transmit beam for data communication; and

selecting a beam for the data communication based on the received information for the transmit beam; and

when receiving a signal to perform additional beam searching from the UE:

determining a second transmit beam parameter including information for a number of transmit antennas activated for second beam searching;

transmitting the determined second transmit beam parameter to the UE; and

transmitting, to the UE, a second reference signal (RS) while changing transmit beams based on the second transmit beam parameter.

6. The method of claim 5 , wherein the number of transmit antennas activated for the second beam searching is larger than the number of transmit antennas activated for the first beam searching.

7. The method of claim 5 , wherein the first transmit beam parameter further comprises information for a number of candidate transmit beams for the first beam searching.

8. A method of a receiver for selecting a beam in a beam recovery mode of a wireless communication system, the method comprising:

identifying a first receive beam parameter including information for a number of receive antennas activated for first beam searching and a first transmit beam parameter including information for a number of transmit antennas activated for the first beam searching;

receiving a first reference signal (RS) based on the first transmit beam parameter while changing receive beams based on the first receive beam parameter;

selecting, based on the received first RS, a transmit beam and a receive beam for data communication;

determining, based on reference signal received power (RSRP) of the received first RS, the selecting operation of the transmit beam and the receive beam for the data communication as:

a first mode in which additional beam searching is performed; or

a second mode in which additional beam searching is not performed; and

transmitting, to a transmitter, information for the selected transmit beam,

wherein the selecting operation of the transmit beam and the receive beam determined as the first mode comprises:

identifying a second receive beam parameter including information for a number of receive antennas activated for second beam searching and a second transmit beam parameter including information for a number of transmit antennas activated for the second beam searching;

receiving a second RS based on the second transmit beam parameter while changing receive beams based on the second receive beam parameter; and

selecting, based on the received second RS, a transmit beam and a receive beam for data communication.

9. The method of claim 8 , wherein identifying the first receive beam parameter and the first transmit beam parameter comprises:

identifying user equipment (UE) information including remaining energy or required maximum transmission latency; and

determining, based on the identified UE information, the first receive beam parameter and the first transmit beam parameter.

10. The method of claim 8 , wherein identifying the first receive beam parameter and the first transmit beam parameter comprises:

identifying channel state information including a channel quality indicator (CQI); and

determining, based on the identified channel state information, the first receive beam parameter and the first transmit beam parameter.

11. The method of claim 8 , wherein the number of receive antennas activated for the second beam searching is larger than the number of receive antennas activated for the first beam searching, and

wherein the number of transmit antennas activated for the second beam searching is larger than the number of transmit antennas activated for the first beam searching.

12. The method of claim 8 , wherein the selecting operation of the transmit beam and the receive beam determined as the second mode comprises:

identifying a transmit beam and a receive beam including a larger RSRP value of the received first RS than other transmit beams and receives beams; and

selecting the transmit beam and the receive beam for the data communication based on the identified transmit beam and receive beam and a preconfigured artificial intelligence (AI) algorithm.

13. The method of claim 8 , wherein the first receive beam parameter further comprises information for a number of candidate receive beams for the first beam searching, and

wherein the first transmit beam parameter further comprises information for a number of candidate transmit beams for the first beam searching.