Patent ID: 8724551

Claim:
A mobile communication system comprising: a mobile station apparatus; a first base station apparatus configured to perform a first communication with the mobile station apparatus before the mobile station apparatus performs a re-connection; and a second base station apparatus configured to perform a second communication with the mobile station apparatus after the mobile station apparatus performs the re-connection, wherein the mobile station apparatus comprises: an antenna; a delay difference detector configured to detect a difference between a first reception timing at which the mobile station apparatus receives, by the antenna, a first signal from the first base station apparatus and a second reception timing at which the mobile station apparatus receives, by the antenna, a second signal from the second base station apparatus; a calculator configured to calculate a predetermined time based on the difference detected by the delay difference detector; and a re-connection processor configured to start the second communication by transmitting, by the antenna, to the second base station apparatus, a first transmission signal, the calculated predetermined time before a first transmission timing at which a first transmission signal is to be transmitted to the first base station apparatus, the start of the second communication being performed in a case that a disconnection of the first communication is detected.