Base station apparatus, mobile terminal apparatus and communication control method

A mobile terminal apparatus comprising:

• a transmission section configured to transmit spatially-multiplexed signals respectively corresponding to a plurality of layers via an uplink, to a base station apparatus;
• a resource specifying section configured to specify resources of response signals for retransmission from the base station apparatus, for signals transmitted by the layers, by using offset values that are fixedly defined in advance between the mobile terminal apparatus and the base station apparatus for respective transport blocks associated with the layer of the uplink;
• and
• a response signal acquiring section configured to acquire the response signals of the resources specified in the resource specifying section.

A communication control method for a base station apparatus comprising the steps of:

• receiving spatially-multiplexed signals respectively corresponding to a plurality of layers via an uplink, from a mobile terminal apparatus;
• generating response signals for retransmission, for signals received in the layers on the uplink;
• and
• allocating the response signals for transport blocks associated with the layers, to resources, by using offset values that are fixedly defined in advance with the mobile terminal apparatus for each of the layers of the uplink.

A base station apparatus comprising:

• a receiving section configured to receive spatially-multiplexed signals respectively corresponding to a plurality of layers, in a plurality of clustered resource blocks that are used in common between the layers for uplink transmission;
• a response signal generation section configured to generate response signals for retransmission, for signals received in the layers on the uplink;
• and
• an allocation section configured to select a resource block index of a different cluster for each of the layers, from resource block indices respectively indicating the clustered resource blocks, and allocate each of the response signals for the transport blocks associated with the layers, to a resource corresponding to the resource block index.

A mobile terminal apparatus comprising:

• a transmission section configured to transmit spatially-multiplexed signals respectively corresponding to a plurality of layers, in a plurality of clustered resource blocks that are used in common between the layers for uplink transmission, to a base station apparatus;
• a resource specifying section configured to specify resources corresponding to resource block indices of different clusters, selected for each of the layers by the base station apparatus, from resource block indices respectively indicating the clustered resource blocks;
• and
• a response signal acquiring section configured to acquire response signals of the resources specified in the resource specifying section.