Patent ID: 8798007

Claim:
A handover method in which a mobile station performs handover from a first cell to a second cell, wherein the second cell is allocated with a set of dedicated random access preambles which are not in common with preambles allocated to a third cell being a neighboring cell to said second cell, the method comprising: a step in which a first radio base station that manages the first cell transmits a handover command signal including mobile station identification information, to the mobile station; a step in which the mobile station transmits a dedicated random access preamble comprised in said set of dedicated random access preambles, to a second radio base station that manages the second cell, after receiving the handover command signal; a step in which the second radio base station transmits a random access response to the mobile station when it is determined that the received dedicated random access preamble is a dedicated random access preamble comprised in said set of dedicated random access preambles; a step in which the mobile station transmits a handover completion signal to the second radio base station, after receiving the random access response; a step in which the second radio base station notifies a radio resource assigned to the mobile station, after receiving the handover completion signal; and a step in which the second radio base station does not transmit the random access response to the mobile station when it is determined that the received dedicated random access preamble is not comprised in said set of dedicated random access preambles.