Mobile communication system, base station apparatus, user apparatus and method

A base station apparatus in a mobile communication system, comprising:

• a first control information generation unit configured to generate first control information including retransmission information on a previously received uplink data channel;
• a second control information generation unit configured to generate second control information including scheduling information on radio resources;
• and
• a multiplexing unit configured to multiplex a downlink lower layer control channel and a downlink data channel to generate a downlink transmission signal, the downlink lower layer control channel including at least one of the first control information and the second control information,
• wherein the multiplexing unit generates the downlink transmission signal to transmit the first control information in any of subframes arriving at a first cycle and to transmit the second control information in any of subframes arriving at a second cycle longer than the first cycle.

A base station apparatus in a mobile communication system, comprising:

• a first control information extraction unit configured to, if a downlink data channel has been previously received, extract first control information including retransmission information on the downlink data channel from a received uplink lower layer control channel;
• a second control information extraction unit configured to extract second control information from the uplink lower layer control channel or other uplink lower layer control channels;
• downlink transmission signal transmitting unit configured to transmit a downlink transmission signal in accordance with the first control information, wherein the downlink transmission signal has not been transmitted or is to be retransmitted,
• wherein the first control information is received in any of subframes arriving at a first cycle, and the second control information is received in any of subframes arriving at a second cycle longer than the first cycle.

A user apparatus in a mobile communication system, comprising:

• a first control information extraction unit configured to receive a downlink lower layer control channel and extract first control information including retransmission information on a previously transmitted uplink data channel;
• a second control information extraction unit configured to extract second control information including scheduling information on radio resources from the downlink lower layer control channel or other downlink lower layer control channels;
• and
• an uplink transmission signal transmitting unit configured to an uplink transmission signal in accordance with the first control information, wherein the uplink transmission signal has not been transmitted or is to be retransmitted,
• wherein inclusion of the first control information in any of subframes arriving at a first cycle and inclusion of the second control information in any of subframes arriving at a second cycle longer than the first cycle are indicated from a base station apparatus to the user apparatus beforehand.

A user apparatus in a mobile communication system, comprising:

• a first control information generation unit configured to generate first control information including retransmission information on a downlink data channel;
• and
• an uplink transmission signal generation unit configured to generate an uplink lower layer control channel including at least one of the first control information and second control information, the second control information including scheduling information on radio resources, and to generate an uplink transmission signal including the uplink lower layer control channel,
• wherein the uplink transmission signal generation unit generates the uplink transmission signal to transmit the first control information in any of subframes arriving at a first cycle and to transmit the second control information in any of subframes arriving at a second cycle longer than the first cycle.

A mobile communication system including a base station apparatus and a user apparatus,

• the base station apparatus comprising:
• a first control information generation unit configured to generate first control information including retransmission information on an uplink data channel;
• and
• a multiplexing unit configured to multiplex a downlink lower layer control channel and a downlink data channel to generate a downlink transmission signal, wherein the downlink lower layer control channel includes at least one of the first control information and second control information including scheduling information on radio resources,
• the user apparatus comprising:
• a first control information extraction unit configured to, if the user apparatus has previously transmitted an uplink data channel, extract the first control information from a received downlink lower layer control channel;
• a second control information extraction unit configured to extract the second control information from the downlink lower layer control channel or other downlink lower layer control channel;
• and
• an uplink transmission signal transmitting unit configured to transmit an uplink transmission signal in accordance with the first control information, wherein the uplink transmission signal has not been transmitted or is to be retransmitted,
• wherein the multiplexing unit generates the downlink transmission signal to transmit the first control information in any of subframes arriving at a first cycle and to transmit the second control information in any of subframes arriving at a second cycle longer than the first cycle.

A mobile communication system including a user apparatus and a base station apparatus,

• the user apparatus comprising:
• a first control information generation unit configured to generate first control information including retransmission information on a downlink data channel;
• and
• an uplink transmission signal generation unit configured to generate an uplink lower layer control channel including at least one of the first control information and second control information, the second control information including scheduling information on radio resources, and to generate an uplink transmission signal including the uplink lower layer control channel,
• the base station apparatus comprising:
• a first control information extraction unit configured to, if a downlink data channel has been previously received, extract the first control information from a received uplink lower layer control channel;
• a second control information extraction unit configured to extract the second control information from the uplink lower layer control channel or other uplink lower layer control channels;
• and
• a downlink transmission signal transmitting unit configured to a downlink transmission signal in accordance with the first control information, wherein the downlink transmission signal has not been transmitted or is to be retransmitted,
• wherein the uplink transmission signal generation unit generates the uplink transmission signal to transmit the first control information in any of subframes arriving at a first cycle and to transmit the second control information in any of subframes arriving at a second cycle longer than the first cycle.