Radio communication base station apparatus and radio communication mobile station apparatus

A radio communication mobile station apparatus comprising:

• a reception section that receives a report of a scheduling result indicating an assigned resource block included in one of a plurality of groups from a radio communication base station apparatus;
• a specifying section that specifies the assigned resource block included in the one of the plurality of groups to which the radio communication mobile station apparatus belongs based on the report;
• and
• a transmission section that transmits a reference signal using the assigned resource block in the one of the plurality of groups to which the radio communication mobile station apparatus belongs out of the plurality of groups formed by dividing a plurality of the resource blocks, to the radio communication base station apparatus,
• wherein correspondences between each of the plurality of groups and one or more of the plurality of resource blocks included in each of the plurality of groups are changed over time, wherein:
• the reception section receives a report of the correspondences between each of the plurality of groups and the one or more of the plurality of resource blocks included in each of the plurality of groups;
• and
• the transmitting section transmits the reference signal using an assigned resource block specified by the report of the correspondences.

A communication method performed by a radio communication base station apparatus, the communication method comprising:

• dividing a plurality of resource blocks into a plurality of groups, wherein each of the plurality of groups includes one or more of the plurality of resource blocks;
• storing a plurality of tables showing correspondences between each of the plurality of groups and the one or more of the plurality of resource blocks included in each of the plurality of groups and a changing order of the correspondences, wherein the changing order varies between the tables;
• switching a table to be used from among the plurality of tables;
• changing correspondences between the plurality of groups and the one or more of the plurality of resource blocks included in each of the plurality of groups over time based on the switched table;
• scheduling to assign a radio communication mobile station apparatus to a resource block included in one of the plurality of groups;
• and
• transmitting a report of a scheduling result indicating the assigned resource block included in the one of the plurality of groups and a report of the switching of the table, to the radio communication mobile station apparatus.

A communication method performed by a radio communication mobile station apparatus, the communication method comprising:

• receiving a report of a scheduling result indicating an assigned resource block included in one of a plurality of groups from a radio communication base station apparatus;
• specifying the assigned resource block included in the one of the plurality of groups to which the radio communication mobile station apparatus belongs based on the report;
• and
• transmitting a reference signal using the assigned resource block in the one of the plurality of groups to which the radio communication mobile station apparatus belongs out of the plurality of groups formed by dividing a plurality of the resource blocks, to the radio communication base station apparatus,
• wherein correspondences between each of the plurality of groups and one or more of the plurality of the resource blocks included in each of the plurality of groups are changed over time, wherein:
• receiving a report of the scheduling result further comprises receiving of the correspondences between each of the plurality of groups and the one or more of the plurality of resource blocks included in each of the plurality of groups;
• and
• transmitting the reference signal further comprises transmitting the reference signal using the specified assigned resource block specified by the report of the correspondences.