Patent ID: 11864038
Assignee: SAMSUNG ELECTRONICS CO., LTD.
Field: Digital communication (Electrical engineering)
Classification: CPC H | IPC H

Claim 7:
8. A method by a target base station, the method comprising:
delivering a radio resource control (RRC) reconfiguration message of a target cell to a source base station based on a handover request from the source base station; and
receiving, on the target cell from a terminal, a random access preamble corresponding to a channel state information reference signal (CSI-RS) which is selected from CSI-RSs by measuring a subset of the CSI-RSs transmitted on the target cell, the selected CSI-RS corresponding to a best beam of the target cell,
wherein a measurement report message including beam measurement information associated with the target cell is transmitted, on a serving cell, from the terminal to the source base station, and
wherein the random access preamble is received after a handover command message including resource configuration of the CSI-RSs associated with the target cell for an initial access beam alignment is transmitted on a serving cell from the source base station to the terminal based on the delivered RRC reconfiguration message of the target cell.