MOBILE COMMUNICATION TERMINAL, MOBILE COMMUNICATION CONTROLLER, MOBILE COMMUNICATION SYSTEM, AND MOBILE COMMUNICATION METHOD

摘要

A communication terminal device (10) is constituted such that when the communication terminal device is within the range of a first communication system, a control signal indicating a desire to transit to a second communication system is transmitted to the first communication system before a communication resource of the second communication system is obtained. The first communication system releases the communication resource of the first communication system in response to the control signal indicating the desire to transit to the second communication system even before the communication resource of the second communication system is obtained.