Mobile terminal, control method, and communication system

A communication system comprising:

• at least one base station that that is configured to transmit a wireless signal;
• and
• a mobile terminal that is configured to enable reception of the wireless signal from the base station by concurrently using a first cell of a first frequency bandwidth and a second cell of a second frequency bandwidth that is different from the first frequency bandwidth, the second cell having a range that is smaller than the first cell, wherein
• the mobile terminal detects a movement speed of the mobile terminal, and
• the mobile terminal shifts to a second state when the detected movement speed falls below a predetermined speed during a first state in which the mobile terminal receives the wireless signal by using at least the first cell, the second state being a state in which the mobile terminal receives the wireless signal by using the second cell without using the first cell.