Mobile communication system and downlink transmission power control method thereof

A method for controlling downlink transmission power in a mobile communication system including a plurality of base stations performable of soft hand-over respecting a mobile terminal, and a wireless network controller connected to said base stations for controlling said base stations, said method comprising the steps of:

• individually controlling downlink transmission power of said base stations according to common transmission power control signals periodically transmitted from said mobile terminal at intervals of first predetermined time;
• and
• periodically correcting the downlink transmission power of said base stations to be equal to each other at intervals of second predetermined time longer than the first predetermined time.

A wireless network controller for use in a mobile communication system having a plurality of base stations to be connected to said wireless network controller, said base stations performable of soft hand-over respecting a mobile terminal, said wireless network controller comprising:

• receiving means for receiving notifications, each of which is represents a sum of control values dependent on common transmission power control signals transmitted by said mobile terminal in each of said base stations, from said base stations concerned with the soft hand-over at predetermined intervals;
• and
• correction instructing means for instructing said base stations concerned with the soft hand-over to equalize downlink transmission power of said base stations in response to the notifications.