Patent ID: 8559916

Claim:
A communication system for performing communication between a first mobile terminal in a first mobile communication system and a second mobile terminal in a second mobile communication system in a communication area by allocating different carriers to the first and second mobile communication systems, the communication system comprising: a shared radio processing apparatus shared by the first and second mobile communication systems and configured to carry out radio processing for the first and second mobile communication systems in the communication area, wherein the shared radio processing apparatus includes a measuring unit configured to measure power of each of the carriers; a carrier usage determination unit configured to determine a frequency of carrier usage of each of the carriers based on a measured value of the corresponding carrier measured by the measuring unit; a carrier status determination unit configured to determine, as a carrier status of the carriers, whether the carriers are allocatable to one of the first and second mobile communication systems based on the frequency of the carrier usage thereof determined by the carrier usage determination unit; and a reporting unit configured to transmit a carrier status report indicating reallocation of one of the carriers from one of the first and second mobile communication systems to the other mobile communication system based on a result of the determination by the carrier status determination unit, to a base station of each of the first and second mobile communication systems.