Handover function testing method and spectrum spread mobile communications system

A mobile communication system comprising:

• a mobile station configured to transmit a plurality of reception power levels measured by the mobile station, wherein each of the plurality of reception powers levels is associated with a different one of a plurality of base station radio apparatuses;
• the plurality of base station radio apparatuses configured to perform communication with the mobile station;
• and
• a radio base station control apparatus configured to control transmission power for the plurality of base station radio apparatuses, and further configured to perform a handover function test between cells covered by the plurality of base station radio apparatuses,
• wherein the radio base station control apparatus is configured to receive the plurality of reception power levels measured by the mobile station and calculate a difference between two of the plurality of reception power levels for two of the plurality of base station radio apparatuses;
• wherein the radio base station control apparatus is configured to compare the calculated difference with a predetermined threshold value, and if the calculated difference is greater than the predetermined threshold:
• the radio base station control apparatus is configured to control transmission power of one of the two of the plurality of base station radio apparatuses so that the difference becomes equal to or smaller than a predetermined threshold value, and perform a handover function test between the cells covered by the two of the plurality of base station radio apparatuses.

A radio base station control apparatus configured to perform a handover function test between cells, comprising:

• an interface configured to receive a plurality of reception power levels measured by a mobile station, wherein each of the plurality of reception powers levels is associated with a different one of a plurality of base station radio apparatuses;
• a reception field difference calculating part configured to calculate a difference between two of the plurality of reception power levels for two of the plurality of base station radio apparatuses;
• a reception field difference comparing part configured to compare the calculated difference with a predetermined threshold value;
• and
• a transmission power control part,
• wherein if the calculated difference is greater than the predetermined threshold:
• the transmission power control part is configured to control transmission power of one of the two of the plurality of base station radio apparatuses so that the difference becomes equal to or smaller the predetermined threshold value.