MOBILE COMMUNICATION SYSTEM AND USER TERMINAL

摘要

A mobile communication system according to embodiments supports a dual connectivity. The mobile communication system comprises: a first base station that establishes an RRC connection with a user terminal, and performs a mobility control in the dual connectivity; and a second base station that is adjacent to the first base station. The first base station transmits, to the second base station, an allocation request requesting additional radio resources for the user terminal when the first base station decides to start the dual connectivity.