Mobile communication system in which communication resources are allocated based on traffic congestion

A mobile communication system in which a mobile station and a base station are connected by a radio transmission path, and the base station and a base station control device are connected by a transmission line, comprising:

• a first management unit in the base station managing first data indicating an amount of available resources of the radio transmission path defined along a first dimension;
• a notification unit periodically notifying the first data from the base station to the base station control device;
• a second management unit in the base station control device managing second data indicating an amount of available resources of the transmission line defined along a second dimension;
• a conversion unit in the base station control device for converting the first and second data to be defined along a common dimension;
• a determination unit in the base station control device determining a maximum available amount of communication resources within both of the converted first and second data in the common dimension;
• an allocation unit allocating first communication resources corresponding to the maximum available amount for the radio transmission path and second communication resources corresponding to the maximum available amount for the transmission line;
• a detection unit detecting disconnection of a call of the mobile station;
• a release unit releasing the first communication resources which have been allocated to the released call in response to the disconnection of the call, wherein
• said notification unit notifies the base station control device of an updated usage of the first communication resources after the release of the call;
• and
• an inquiry unit, provided in the base station control device, inquiring about the updated usage of the first communication resources to the base station when the disconnection of the call is detected, wherein said notification unit performs the notification in response to the inquiry from said inquiry unit.