Patent ID: 8885598

Claim:
A radio terminal communicates with a communication terminal through a first network or a second network having a delay time shorter than a delay time in the first network, the radio terminal comprising: a receiver configured to receive packets at predetermined intervals through the first network or the second network; a buffer configured to temporarily store the packets received by the receiver; a transmitter configured to transmit a preparation request for handover from the first network to the second network; and a reproducing unit configured to reproduce the packets stored in the buffer at a predetermined rate determined according to the predetermined intervals, wherein the reproducing unit executes an adaptive buffer control for adjusting a packet reproducing rate so that an amount of the packets stored in the buffer is maintained at an optimum packet amount, wherein the optimum packet amount is determined according to the delay time in the first or second network, and the reproducing unit stops the adaptive buffer control in response to a transmission of the preparation request by the transmitter, wherein the reproducing unit decreases the amount of the packets stored in the buffer by changing the packet reproducing rate to a rate higher than the predetermined rate in response to the transmission of the preparation request by the transmitter and the receiver receives a completion notification of the handover from the first network to the second network, and wherein the reproducing unit resets the packet reproducing rate to the predetermined rate when the amount of the packets stored in the buffer reaches a predetermined amount before a reception of the completion notification by the receiver.