Patent ID: 8711815

Claim:
A mobile terminal apparatus comprising: a spreading processing section configured to perform processing for multiplying a data signal by a code varying for each user; a transmission section configured to transmit the spreading-processed data signal to a radio base station apparatus on an uplink shared channel; and a mapping section configured to map the spreading-processed data signal to a resource block having a particular frequency band, wherein the spreading processing section performs spreading processing to the data signal by applying code division multiplexing as a user multiplexing method based on determination of a traffic amount in uplink by the radio base station apparatus, and when the code division multiplexing is applied and a number of multiplexed users exceeds a predetermined threshold, the spreading processing performed includes processing using orthogonal codes that are mutually orthogonal and processing using non-orthogonal codes, wherein the resource block having the particular frequency band to which the mapping section maps the spreading-processing data signal comprises bands dedicated to code division multiplexing that are separated from each other in a frequency domain, and wherein the spreading-processed data signal is subjected to inter-slot frequency hopping in a subframe.