Patent ID: 8208923

Claim:
A mobile communication method for performing handover of a mobile station from a radio base station to another radio base station different from the radio base station in a mobile communication system including a plurality of radio base stations and an upper node of the plurality of radio base stations, in which the upper node and a handover source radio base station store setup information on an access bearer having been set up between the upper node and the handover source radio base station, the mobile communication method comprising the steps of (A) informing, from the handover source radio base station to a handover target radio base station, the access bearer setup information; (B) storing, at the handover target radio base station, the access bearer setup information informed of by the handover source radio base station; and (C) setting up, at the upper node, an access bearer between the upper node and the handover target radio base station by using the stored access bearer setup information without performing reallocation processing of new access bearer setup information, the access bearer being set up in response to a path switching request from the handover target radio base station.