Apparatus and method for controlling directivity in wireless communication system

1. A method performed by an apparatus in a wireless communication system, the method comprising:

transmitting or receiving a signal based on a first direction of a first beam of the apparatus;

identifying a second direction of a second beam of the apparatus after a movement of the apparatus;

if the second direction is within a designated range of the first direction of the first beam, identifying a third beam which is different from the second beam, among a plurality of beams for a beam search; and

if the second direction is not within the designated range of the first direction, transmitting or receiving a signal for the beam search by using the second beam.

2. The method of claim 1 , further comprising:

determining whether a direction of the third beam is within the designated range of the first direction;

if the direction of the third beam is not within the designated range of the first direction, transmitting or receiving a signal for the beam search by using the third beam; and

if the direction of the third beam is within the designated range of the first direction, identifying a fourth beam among the plurality of beams for the beam search.

3. The method of claim 1 , wherein whether the second beam is usable for the beam search or not is determined based on a difference between the first direction and the second direction.

4. The method of claim 1 , further comprising:

measuring the movement of the apparatus by using a sensor of the apparatus; and

when the second beam is configured to the apparatus, obtaining measurement information indicating the measured movement of the apparatus.

5. The method of claim 4 , wherein the obtaining of the measurement information comprises:

obtaining the measurement information according to a periodicity configured for an application executed in the apparatus.

6. The method of claim 1 , wherein the measurement information comprises a change amount according to the movement of the apparatus with respect to a reference value of a parameter indicating a status of the apparatus.

7. The method of claim 1 , further comprising:

identifying a new direction of the first beam according to the movement of the apparatus, and

based on identifying that the second direction of the second beam is within a threshold range of the new direction, transmitting or receiving a signal for the beam search using the second beam.

8. The method of claim 1 , further comprising:

determining beam search candidates based on the plurality of beams of the apparatus and a plurality of beams of another apparatus;

identifying at least one search candidate among the beam search candidates, based on the movement of the apparatus; and

performing a beam search for at least one beam of the apparatus or at least one beam of the another apparatus corresponding to the at least one search candidate.

9. An apparatus in a wireless communication system, the apparatus comprising:

at least one transceiver; and

at least one processor operably coupled to the at least one transceiver,

wherein the at least one processor is configured to:

control the at least one transceiver to transmit or receive a signal based on a first direction of a first beam of the apparatus,

identify a second direction of a second beam of the apparatus after a movement of the apparatus,

if the second direction is within a designated range of the first direction of the first beam, identify a third beam which is different from the second beam, among a plurality of beams for a beam search, and

if the second direction is not within the designated range of the first direction, transmit or receive a signal for the beam search by using the second beam.

10. The apparatus of claim 9 , wherein the at least one processor is further configured to:

determine whether a direction of the third beam is within the designated range of the first direction; and

if the direction of the third beam is not within the designated range of the first direction, transmit or receive a signal for the beam search by using the third beam; and

if the direction of the third beam is within the designated range of the first direction, identify a fourth beam among the plurality of beams for the beam search.

11. The apparatus of claim 9 , wherein whether the second beam is usable for the beam search or not is determined based on a difference between the first direction and the second direction.

12. The apparatus of claim 9 , wherein the at least one processor is further configured to:

measure the movement of the apparatus by using a sensor of the apparatus; and

when the second beam is configured to the apparatus, obtain measurement information indicating the measured movement of the apparatus.

13. The apparatus of claim 12 , wherein, in order to obtain the measurement information, the at least one processor is further configured to:

obtain the measurement information according to a periodicity configured for an application executed in the apparatus.

14. The apparatus of claim 9 , wherein the measurement information comprises a change amount according to the movement of the apparatus with respect to a reference value of a parameter indicating a status of the apparatus.

15. The apparatus of claim 9 , wherein the at least one processor is further configured to:

identify a new direction of the first beam according to the movement of the apparatus,

based on identifying that the second direction of the second beam is within a threshold range of the new direction, transmit or receive a signal for the beam search using the second beam.

16. The apparatus of claim 9 ,

wherein the at least one processor is further configured to:

determine beam search candidates based on the plurality of beams of the apparatus and a plurality of beams of another apparatus;

identify at least one search candidate among the beam search candidates, based on the movement of the apparatus; and

perform a beam search for at least one beam of the apparatus or at least one beam of the another apparatus corresponding to the at least one search candidate.

17. The apparatus of claim 9 , wherein the at least one processor is further configured to:

determine the first direction as a reference direction;

identify, in order to perform the beam search, a beam corresponding to the reference direction based on measurement information of the movement of the apparatus; and

determine the identified beam as a communication beam.

18. An apparatus in a wireless communication system, the apparatus comprising:

at least one transceiver; and

at least one processor operably coupled to the at least one transceiver,

wherein the at least one processor is configured to:

determine whether a movement of the apparatus is detected based on measurement information;

if the movement of the apparatus is not detected, perform a first beam training using each beam of a plurality of beams;

if the movement of the apparatus is detected, identify a subset of the plurality of beams based on the measurement information and perform a second beam training using each beam of the subset of the plurality of beams; and

communicate with another apparatus based on a result of the first beam training or the second beam training.