Patent ID: 8386635

Claim:
A data communication system, comprising: a mobile terminal to start downloading first data to be downloaded from a distribution server for storing the downloaded first data in a memory of the mobile terminal, to check remaining memory capacity of the memory, and to start uploading second data stored in the memory for saving the second data in a data storage server; and a base station provided between the mobile terminal and the data storage server, wherein the mobile terminal requests the base station to change transmission speeds of an upload channel for the second data and a download channel for the first data between the mobile terminal and the base station such that there remains memory capacity available in the memory for the downloaded first data based on remaining memory capacity of the memory and the transmission speeds of the upload channel to the base station and the download channel from the base station, wherein the mobile terminal comprises a management table containing the remaining memory capacity of the memory, a current transmission speed, and a new transmission speed to be requested to the base station; and is further configured to determine at least one of the transmission speeds of the upload channel and the download channel based on the remaining capacity of the memory and the transmission speeds, and request the base station to use the determined at least one of the transmission speeds.