<p>A mobile communication method includes process (A) in which a handover-originating wireless base station transmits a handover request which includes a first parameter through a switching station to a handover-destination wireless base station; a process (B) in which the switching station transmits a second parameter generated by the switching station and included in the handover request to the handover-destination wireless base station; a process (C) in which the handover-destination wireless base station uses either the first parameter or the second parameter to generate a first key; and a process (D) in which the first key is used between a mobile station and the handover-destination wireless base station to start communication in a handover-destination cell.</p>
