A method for handover, said method being performed by a mobile station, MS, of a wireless communication system, the method comprising: sending (1-1; 605) to a serving base station, BS, a scan request message for scanning a downlink, DL, beam with respect to said serving BS and a neighboring BS; receiving (1-2; 610) from the serving BS a scan response message; performing (2; 615) a scanning procedure with the serving BS and the neighboring BS based on the scan response message, wherein the scanning procedure comprises performing, with each of said serving BS and said neighboring BS, a DL beam selection procedure which comprises the following two steps: a first step of repeating, as many times as DL Rx beams of the MS, the process of changing a DL Rx beam of the MS, receiving DL Tx beams of said BS and measuring each DL Tx beam of the BS, and a second step of identifying the best DL Rx beam and the best DL Tx beam of said BS among the measurement results; sending (3; 630) to the serving BS a scan report message comprising a result of the scanning procedure, wherein the result of the scanning at least comprises, for each of said serving BS and said neighboring BS, a base station identifier, BSID, of said BS, a DL beam identifier of the best DL Tx beam identified for said BS and the measurement result of the best DL Tx beam of said BS; when receiving (6; 635) an air handover, HO, request message from the serving BS in response to the message, generating and transmitting (7, 645) to the serving BS an air-HO response message based on the air-HO request message, wherein the air-HO request message at least comprises the BSID of the neighboring BS and a DL beam selection parameter indicating that the MS is to omit DL beam selection with the neighboring BS, wherein the air-HO response message at least comprises the BSID of the neighboring BS and information indicating that the MS is able to hand over; and in the process of performing a handover with the neighboring BS, omitting performing DL beam selection with the neighboring BS based on the air-HO request message; and after the handover is completed, receiving (10; 655) data from the neighboring BS using the best DL Rx beam being identified for said neighboring BS. sending (1-1; 605) to a serving base station, BS, a scan request message for scanning a downlink, DL, beam with respect to said serving BS and a neighboring BS; receiving (1-2; 610) from the serving BS a scan response message; performing (2; 615) a scanning procedure with the serving BS and the neighboring BS based on the scan response message, wherein the scanning procedure comprises performing, with each of said serving BS and said neighboring BS, a DL beam selection procedure which comprises the following two steps: a first step of repeating, as many times as DL Rx beams of the MS, the process of changing a DL Rx beam of the MS, receiving DL Tx beams of said BS and measuring each DL Tx beam of the BS, and a second step of identifying the best DL Rx beam and the best DL Tx beam of said BS among the measurement results; sending (3; 630) to the serving BS a scan report message comprising a result of the scanning procedure, wherein the result of the scanning at least comprises, for each of said serving BS and said neighboring BS, a base station identifier, BSID, of said BS, a DL beam identifier of the best DL Tx beam identified for said BS and the measurement result of the best DL Tx beam of said BS; when receiving (6; 635) an air handover, HO, request message from the serving BS in response to the message, generating and transmitting (7, 645) to the serving BS an air-HO response message based on the air-HO request message, wherein the air-HO request message at least comprises the BSID of the neighboring BS and a DL beam selection parameter indicating that the MS is to omit DL beam selection with the neighboring BS, wherein the air-HO response message at least comprises the BSID of the neighboring BS and information indicating that the MS is able to hand over; and in the process of performing a handover with the neighboring BS, omitting performing DL beam selection with the neighboring BS based on the air-HO request message; and after the handover is completed, receiving (10; 655) data from the neighboring BS using the best DL Rx beam being identified for said neighboring BS.