Patent ID: 8422441

Claim:
A mobile communication device configured to send data to terminals via an orthogonal frequency division multiplexing method, comprising: a mapping table in which information on a code rate and frequency sending efficiency is made to correspond to a communication quality index, said communication quality index being sent from the terminals based on a reception quality of a reference signal sent from said mobile communication device to the terminals; a resource management unit configured to, for wireless resource blocks that said mobile communication device can allocate to the terminals, manage a number of resource blocks already allocated to the terminals and a number of free resource blocks; a data communication speed calculation unit configured to, in response to a request from the terminals, refer to information on the number of free resource blocks managed by said resource management unit, and said mapping table, and calculate a data communication speed based on the communication quality index, the code rate, and the frequency sending efficiency received from the terminal; a statistical traffic amount calculation unit configured to perform a statistical calculation by collecting traffic amounts sent from said mobile, and to calculate a statistical value of a traffic amount of said mobile communication device during each hour of the 24 hours of a day; a free resource blocks conversion unit configured to calculate a statistical value of the number of free resource blocks during each hour of the 24 hours of a day from the statistical value of the traffic amount; a maintaining time calculation unit configured to calculate an estimated maintaining time of the data communication speed, calculated by said data communication speed calculation unit, from the statistical value of free resource blocks calculated by said free resource blocks conversion unit; and a sending unit configured to send the data communication speed and the maintaining time to the terminal; wherein when the terminals are newly connected to the mobile communication device, said data communication speed calculation unit is configured to calculate the data communication speed, said maintaining time calculation unit is configured to calculate the maintaining time for maintaining the data communication speed when the terminals are newly connected, by referring to the statistical value of the number of free resource blocks during each hour of the 24 hours of the day, and the sending unit is configured to send, to the newly connected terminals, a data communication speed and the maintaining time for maintaining the data communication speed; and wherein said data communication speed calculation unit is configured to refer to said mapping table to acquire the code rate and the frequency sending efficiency corresponding to the communication quality index sent from the terminals and calculate the data communication speed based on an expression expressed by data communication speed=code rate×frequency sending efficiency×number of free resource blocks/unit time.