Method and electronic device for controlling transmission power for multi-beam transmission

1. A mobile electronic device comprising:

a first antenna module comprising at least one array antenna;

a second antenna module comprising at least one array antenna;

at least one processor operatively connected to the first antenna module and the second antenna module; and

memory electrically connected to the at least one processor,

wherein the memory stores instructions that, when executed, cause the at least one processor to:

identify a plurality of beams comprising a first beam and a second beam for communicating with at least one base station using the first antenna module,

determine, when the first beam and the second beam correspond to a same antenna module, a third beam, which corresponds to a direction different from a direction of the first beam and of which a received signal strength from the at least one base station exceeds a specified value, is available,

based on a determination that the third beam is unavailable, communicate with the at least one base station by applying, to the first beam and the second beam, power backoff, and

based on a determination that the third beam is available, change the second beam for the third beam and communicate with the at least one base station using the first beam and the third beam without applying the power backoff.

2. The mobile electronic device of claim 1 , wherein the instructions, when executed, further cause the at least one processor to control transmission power associated with each of the plurality of beams based on maximum transmission power that is the same as that for a single-beam transmission when the plurality of beams correspond to different directions.

3. The mobile electronic device of claim 1 , wherein the instructions, when executed, further cause the at least one processor to identify whether the first beam and the second beam correspond to the same direction as the first beam and the second beam being formed by the same antenna module.

4. The mobile electronic device of claim 1 ,

wherein the first antenna module and the second antenna module are arranged so as to be oriented in different directions, and

wherein, when the first beam and the second beam are associated with the same antenna module among the first antenna module and the second antenna module, the first beam and the second beam correspond to the same direction.

5. The mobile electronic device of claim 1 ,

wherein the first beam corresponds to a vertically polarized wave, and

wherein the second beam corresponds to a horizontally polarized wave.

6. The mobile electronic device of claim 1 , wherein the instructions, when executed, further cause the at least one processor to:

apply first power backoff to the first beam; and

apply second power backoff that is larger than the first power backoff to the second beam when the third beam is unavailable.

7. The mobile electronic device of claim 6 ,

wherein the first beam is associated with a higher frequency band compared to the second beam, or

wherein the first beam and the second beam are associated with cells of different types.

8. The mobile electronic device of claim 1 , wherein the instructions, when executed, further cause the at least one processor to perform spatial multiplexing or spatial diversity by transmitting a wireless signal using the plurality of beams.

9. A method for multi-beam transmission of a mobile communication device, the method comprising:

identifying a plurality of beams comprising a first beam and a second beam to be used for transmission;

determining, when the first beam and the second beam corresponds to a same antenna module, whether a third beam which corresponds to a direction different from a direction of the first beam and of which a received signal strength is exceeds at least a specified value is available;

based on a determination that the third beam is unavailable, transmitting a signal by applying, to the first beam and the second beam, power backoff; and

based on a determination that the third beam is available, changing the second beam for the third beam and transmitting the signal without applying the power backoff.

10. The method of claim 9 , further comprising:

controlling transmission power associated with each of the first beam and the second beam based on maximum transmission power that is the same as that for a single-beam transmission when the first beam and the second beam correspond to different directions.

11. The method of claim 10 , further comprising, determining that the first beam and the second beam correspond to the same direction by identifying that the first beam and the second beam are associated with the same antenna module among a plurality of antenna modules of the mobile communication device.

12. The method of claim 10 , wherein a reference regulation of a power density is satisfied by controlling the transmission power.

13. The method of claim 9 , wherein the transmitting of the signal by applying, to the first beam and the second beam, the power backoff comprises:

applying first power backoff to the first beam; and

applying second power backoff that is larger than the first power backoff to the second beam.

14. The method of claim 13 ,

wherein the first beam is associated with a higher frequency band compared to the second beam, or

wherein the first beam and the second beam are associated with cells of different types.

15. The method of claim 9 , further comprising:

transmitting a wireless signal for spatial multiplexing or spatial diversity using the first beam and the second beam or the first beam and the third beam.

16. The method of claim 9 , further comprising performing a multiple-input multiple-output (MIMO) operation, orthogonal polarization transmission, or spatial multiplexing with a base station using the first beam and the third beam.