Method of controlling mobile communication system, control device, and mobile communication system

A method of controlling a mobile communication system, comprising a radio base station to which transmission diversity of performing radio transmission using a plurality of antennas is applied, and a mobile station for communicating with the radio base station,

• wherein a transmission diversity system is determined according to information about a channel in an uplink from the mobile station to the radio base station,
• wherein the information about the channel in the uplink is a transmission rate of a channel in an uplink, an amplitude ratio of a control channel to a data channel, a transmission time interval, a target error rate, and a slot format, based on at least one of which a transmission diversity system is determined,
• and wherein the transmission diversity system control means uses open loop transmission diversity when the transmission rate of the channel in the uplink is low, and uses closed loop transmission diversity when the transmission rate of the uplink is high.

A control device which controls execution of transmission diversity of a radio base station for performing wireless transmission with a mobile station using a plurality of antennas, comprising transmission diversity system control means for determining a transmission diversity system according to information about a channel in an uplink from the mobile station,

• wherein the information about the channel in the uplink is a channel type, and the transmission diversity system control means uses open loop transmission diversity when the channel type refers to a channel for transmitting voice, and uses closed loop transmission diversity when the channel type refers to a channel for transmitting a packet.

A control device which controls execution of transmission diversity of a radio base station for performing wireless transmission with a mobile station using a plurality of antennas, comprising transmission diversity system control means for determining a transmission diversity system according to information about a channel in an uplink from the mobile station,

• wherein the information about the channel in the uplink is a transmission rate of a channel in the uplink, an amplitude ratio of a control channel to a data channel, a transmission time interval, a target error rate, and a slot format, based on at least one of which the transmission diversity system control means determines a transmission diversity system,
• and wherein the transmission diversity system control means uses open loop transmission diversity when the transmission rate of the channel in the uplink is low, and uses closed loop transmission diversity when the transmission rate of the uplink is high.