| 摘要 |
PROBLEM TO BE SOLVED: To provide a radio communication system, a communication method, a base station device, and a communication terminal capable of switching a use frequency band by a further simplified procedure.SOLUTION: A radio communication system comprises: a base station device; and a communication terminal capable of communicating with the base station device by using a plurality of frequency bands. The radio communication system comprises: first notification means which is installed in one of the base station device and the communication terminal, and notifies the other of the base station device and the communication terminal of a preparation request for switching when detecting a state of necessity to switch a frequency band used as a main frequency band of the plurality of frequency bands; and second notification means which notifies the one of the base station device and the communication terminal of preparation completion of switching of the frequency band, in response to determination that the state shows the necessity to switch the frequency band used as the main frequency band. |
