A communication system comprising: a base station; a mobile management device including: a first receiver configured to receive a speed prediction value on a mobile terminal based on measurement information by Minimization of Driving Test of the mobile terminal, and a first transmitter configured to transmit a message including the speed prediction value to the base station, the base station including: a second receiver configured to receive the message including the speed prediction value, and a controller configured to execute handover control based on the speed prediction value which is received; a trace collection server configured to collect the measurement information, and configured to calculate the speed prediction value, wherein: the first transmitter is configured to transmit periodically a request for the speed prediction value to the trace collection server; the first transmitter is configured to transmit a modification request to the base station when the speed prediction value received as response to the request is different from the speed prediction value received in the past; wherein the modification request includes the speed prediction value received from the trace collection server; the base station further includes a second transmitter configured to transmit a radio resource control connection reconfiguration message including measurement configuration information to the mobile terminal; the controller (203 is configured to determine the measurement configuration information necessary for terminal measurement in accordance with the speed prediction value included in the modification request when the second receiver receives the modification request. a base station; a mobile management device including: a first receiver configured to receive a speed prediction value on a mobile terminal based on measurement information by Minimization of Driving Test of the mobile terminal, and a first transmitter configured to transmit a message including the speed prediction value to the base station, a first receiver configured to receive a speed prediction value on a mobile terminal based on measurement information by Minimization of Driving Test of the mobile terminal, and a first transmitter configured to transmit a message including the speed prediction value to the base station, the base station including: a second receiver configured to receive the message including the speed prediction value, and a controller configured to execute handover control based on the speed prediction value which is received; a second receiver configured to receive the message including the speed prediction value, and a controller configured to execute handover control based on the speed prediction value which is received; a trace collection server configured to collect the measurement information, and configured to calculate the speed prediction value, wherein: the first transmitter is configured to transmit periodically a request for the speed prediction value to the trace collection server; the first transmitter is configured to transmit a modification request to the base station when the speed prediction value received as response to the request is different from the speed prediction value received in the past; wherein the modification request includes the speed prediction value received from the trace collection server; the base station further includes a second transmitter configured to transmit a radio resource control connection reconfiguration message including measurement configuration information to the mobile terminal; the controller (203 is configured to determine the measurement configuration information necessary for terminal measurement in accordance with the speed prediction value included in the modification request when the second receiver receives the modification request.