Patent ID: 8290494

Claim:
A mobile communication system comprising: a first mobile station device that performs handover from a first base station device to a second base station device; and another base station device that communicates with each of the first and second base station devices via a network, and performs a radio communication with a second mobile station device that makes a call connection with the first mobile station device, wherein the first mobile station device includes: first data acquisition destination switching means for switching an acquisition destination of data transmitted from the second mobile station device from the first base station device to the second base station device after a radio communication with the second base station device starts; means for transmitting a switching request for a communication path to the another base station device after the first data acquisition destination switching means switches the acquisition destination of data; and first receive timing difference measurement means for measuring a difference between a timing at which the first mobile station device receives data transmitted from the another base station device through the first base station device, and a timing at which the first mobile station device receives data identical with the data transmitted from the another base station device through the second base station device, wherein the first data acquisition destination switching means switches the data acquisition destination on the basis of the timing difference measured by the first receive timing difference measurement means, and wherein the another base station device includes communication path control means for completing a communication with the first base station device in response to the switching request for the communication path which is transmitted from the first mobile station device.