Wireless communication control system, radio base station and wireless communication control method

10:

• A radio communication control system which performs a data communication by sharing a shared data channel among a plurality of mobile stations, comprising:
• a transmission power lower limit value setting section configured to set a lower limit value of a transmission power of a shared control channel for transmitting a control signal for the shared data channel when the transmission power of the shared control channel is controlled, and to set the transmission power of the shared control channel at the lower limit value when the transmission power of the shared control channel is lower than the lower limit value.

11:

• The radio communication control system according to claim 10, wherein the transmission power lower limit value setting section is further configured to control the transmission power of the shared control channel by adding an offset to a transmission power of a dedicated channel to be transmitted dedicatedly to each of the plurality of mobile stations.

12:

• The radio communication control system according to claim 11, wherein the transmission power lower limit value setting section is further configured to control the offset in accordance with a quality of the shared control channel.

13:

• The radio communication control system according to claim 12, wherein the quality of the shared control channel is a block error rate of the shared control channel.

14:

• The radio communication control system according to claim 10, wherein the shared data channel is an HS-PDSCH, and the shared control channel is an HS-SCCH.

15:

• The radio communication control system according to claim 11, wherein the shared data channel is an HS-PDSCH, and the shared control channel is an HS-SCCH.

16:

• The radio communication control system according to claim 12, wherein the shared data channel is an HS-PDSCH, and the shared control channel is an HS-SCCH.

17:

• The radio communication control system according to claim 13, wherein the shared data channel is an HS-PDSCH, and the shared control channel is an HS-SCCH.

18:

• The radio communication control system according to claim 10, wherein the transmission power lower limit value setting section is further configured to set the lower limit value according to any one of a service type, a contract type, a receiver type, a cell type, and a priority class type, of each of the plurality of mobile stations.

19:

• The radio communication control system according to claim 17, wherein the receiver type is a type according to a RAKE receiver, an equalizer, a receive diversity, an interference canceller, a maximum transmission rate, or a receivable maximum number of codes.

20:

• A radio base station in a radio communication control system which performs a data communication by sharing a shared data channel among a plurality of mobile stations, comprising:
• a transmission power lower limit value setting section configured to set a lower limit value of a transmission power of a shared control channel for transmitting a control signal for the shared data channel when the transmission power of the shared control channel is controlled, and to set the transmission power of the shared control channel at the lower limit value when the transmission power of the shared control channel is lower than the lower limit value.