Patent ID: 8447271

Claim:
A mobile communication system having a specific cell configured to use a user line which is a wired line connecting the specific cell to a wireless carrier, and to use a carrier line that is separate from the user line, the system comprising: a line determination unit configured to determine whether or not a communication call uses the user line, by using a line identifier configured to identify a user-installed radio base station managing the specific cell, the radio base station being connected to the user line, the line identifier including information identifying a type of the user line, information identifying a ratio of a number of packets sent and received using the user line to a number of packets sent and received using the carrier line, and a base station identifier for the user-installed base station; a calculation unit configured to calculate a reduction fee to be discounted from a usage fee for the communication call using the user line connected to the user-installed radio base station managing the specific cell; a call type determination unit configured to determine whether or not a type of the communication call using the user line or a connection method of the communication call using the user line is a reduction target; and a notification unit configured to notify the user-installed radio base station of the reduction fee to be discounted, wherein the calculation unit calculates a reduction fee to be discounted from a usage fee for the communication call using the user line connected to the user-installed radio base station managing the specific cell, if the type of the communication call using the user line or the connection method of the communication call using the user line is a reduction target, and the calculation unit calculates the reduction fee using the ratio of a number of packets sent and received using the user line to a number of packets sent and received using the carrier line that is included in the line identifier.