Base station apparatus, mobile communication system and communication control method

A mobile communication system comprising:

• a base station apparatus connected with user equipment;
• and
• a charging apparatus configured to perform charging management of the user equipment,
• wherein the base station apparatus determines whether the user equipment is in a discontinuous reception state in which the user equipment receives a physical downlink control channel intermittently or in a non-discontinuous reception state based on a transmission timing of a physical downlink control channel for new transmission to the user equipment and DRX Inactive Timer started from the transmission timing and measures a time during which the user equipment is in the non-discontinuous reception state in a connection state with the user equipment, and
• the charging apparatus determines a charging amount based on the time measured by the base station apparatus.

A communication control method comprising the steps of:

• establishing connection with user equipment;
• determining whether the user equipment is in a discontinuous reception state in which the user equipment receives a physical downlink control channel intermittently or in a non-discontinuous reception state based on a transmission timing of a physical downlink control channel for new transmission to the user equipment and DRX Inactive Timer started from the transmission timing and measures a time during which the user equipment is in the non-discontinuous reception state within a connection period during which the user equipment is in a connection state;
• and
• determining a charging amount based on the measured time.