Radio network controller and transmitting power control method

A transmitting power control method being operable to set a time slot used to transmit a channel identification spread code and time slot information in a radio network controller transmitting the channel identification spread code and the time slot information to a base station device transmitting information of transmitting power control used to control a radio transmitting power of a radio terminal, the transmitting power control method comprising the steps of:

• acquiring a measurement value of a round-trip time when a signal transmitted from the base station device shuttles between the base station device and the radio terminal;
• acquiring an offset value indicating a delay of a timing at which the base station device transmits the information of transmitting power control to the radio terminal, from a reference timing;
• searching a first time slot unused in case of a combination with a first time slot information determined by the acquired offset value and a prepared channel identification spread code;
• in case that the first time slot unused is unsearchable, searching a second time slot unused in case of a combination with a second time slot information that an allowable range of a propagation delayed amount between the base station device and the radio terminal is smaller than the first time slot information and the prepared channel identification spread code;
• and
• controlling to transmit the channel identification spread code and the time slot information to the base station device by searching the unused time slot in such a way as to execute a processing of the searching the second time slot up to a predetermined number of the time slot.

A radio communication system comprising a base station device and a radio network controller being operable to transmit a channel identification spread code and time slot information to the base station device transmitting information of transmitting power control used to control a radio transmitting power of a radio terminal, the radio communication system comprising:

• the base station device for measuring a round-trip time when a signal shuttles between the base station device and the radio terminal;
• and
• the radio network controller for acquiring the measurement value of the round-trip time and an offset value indicating a delay of a timing at which the base station device transmits the information of transmitting power control to the radio terminal, from a reference timing;
• in case that the first time slot unused is unsearchable, searching a first time slot unused in case of a combination with a first time slot information determined by the acquired offset value and a prepared channel identification spread code;
• searching a second time slot unused in case of a combination with a second time slot information that an allowable range of a propagation delayed amount between the base station device and the radio terminal is smaller than the first time slot information and the prepared channel identification spread code;
• and
• controlling to transmit the channel identification spread code and the time slot information to the base station device by searching the unused time slot in such a way as to execute a processing of the searching the second time slot up to a predetermined number of the time slot.