Abstract: In a communication terminal, a communication occurrence notifying unit detects occurrence of data communication. A determining unit determines whether the data communication occurs and whether an SCRI is transmitted based on a time set in a timer. A transmitting unit transits the SCRI to a network according to the determination result of the determining unit. The determining unit determines whether the SCRI is transmitted based on an expiration time of “N×S” seconds longer than “N×P” seconds, after the SCRI is transmitted in accordance with expiration of “N×P” seconds.

Abstract: A mobile terminal apparatus includes a wireless communicator for communicating with a first wireless base station and a second wireless base station; and a controller. The controller measures a first signal quality and a second signal quality, the first signal quality being signal quality of a signal from the first wireless base station which is communicated with the communicator, the second signal quality being a signal quality of a signal received by the communicator from the second wireless base station, and executes a handover from the first wireless base station to the second wireless base station by controlling the communicator when the first signal quality is lower than the second signal quality and an integration value, along the time axis, of a difference between the first and the second signal qualities is more than a predetermined value.

Abstract: A mobile terminal apparatus includes a wireless communicator for communicating with a first wireless base station and a second wireless base station; and a controller. The controller measures a first signal quality and a second signal quality, the first signal quality being signal quality of a signal from the first wireless base station which is communicated with the communicator, the second signal quality being a signal quality of a signal received by the communicator from the second wireless base station, and executes a handover from the first wireless base station to the second wireless base station by controlling the communicator when the first signal quality is lower than the second signal quality and an integration value, along the time axis, of a difference between the first and the second signal qualities is more than a predetermined value.

Abstract: A communication system includes a transmitter and a receiver. The transmitter includes a data transmitting section configured to transmit data. The receiver includes a data receiving section, a memory, a memory managing section, and a control section. The data receiving section is configured to receive the data transmitted from the transmitter. The memory is configured to store the received data. The memory managing section is configured to manage a total number of free regions discretely allocated on the memory. The control section is configured to perform a control process in accordance with the total number of the free regions on the memory, the control process including at least one of request for starting flow control to the transmitter and reallocation of the data stored in the memory for reducing the total number of the free regions.