User terminal, radio base station and radio communication method

A radio base station comprising:

• a multiplexing section that non-orthogonal-multiplexes downlink signals for a plurality of user terminals over a given radio resource;
• and
• a scheduling section that executes retransmission control of downlink signals, based on
• a judgement result as to whether or not, in the user terminal having received the downlink signals for the plurality of user terminal, a downlink signal for another user terminal has been successfully received and
• a judgement result as to whether or not a downlink signal for the user terminal has been successfully received in the user terminal,
• wherein these judgement results are reported from the user terminal.

A radio communication method, wherein:

• a radio base station non-orthogonal-multiplexes downlink signals for a plurality of user terminals over a given radio resource;
• a user terminal having received the downlink signals for the plurality of user terminal:
• decodes a downlink signal for another user terminal,
• judges whether or not the downlink signal for the other user terminal has been successfully received based on a decoding result of the downlink signal for the other user terminal,
• cancels the decoded downlink signal for the other user terminal from the downlink signals for the plurality of user terminals,
• decodes a downlink signal for the user terminal, from the downlink signals for the plurality of user terminals, from which the downlink signal for the other user terminal has been canceled,
• judges whether the downlink signal for the user terminal has been successfully received based on a decoding result of the downlink signal for the user terminal, and
• reports a judgement result as to whether or not the downlink signal for the other user terminal has been successfully received and a judgement result as to whether or not the downlink signal for the user terminal has been successfully received, to the radio base station;
• and
• the radio base station executes retransmission control of downlink signals based on reports from the user terminal.