Base station apparatus, terminal apparatus, and communication method for the same

A communication method for a terminal apparatus for communicating with a base station apparatus, the communication method comprising:

• a first step of receiving a multi-access signature process index from the base station apparatus;
• and
• a second step of transmitting a demodulation reference signal and an uplink physical channel, wherein
• the multi-access signature process index associates one demodulation reference signal with multiple spreading code sequences, the transmitter transmits the uplink physical channel multiplied by one spreading code sequence selected from the multiple spreading code sequences, and
• the spreading code sequence by which the uplink physical channel is multiplied during retransmission is different from the spreading code sequence by which the uplink physical channel is multiplied during initial transmission.

A base station apparatus for communicating with a terminal apparatus, the base station apparatus comprising:

• a transmitter configured to transmit a multi-access signature process index to the terminal apparatus and
• a receiver configured to receive a demodulation reference signal and an uplink physical channel, wherein
• the multi-access signature process index associates one demodulation reference signal with multiple spreading code sequences, the transmitter transmits the uplink physical channel multiplied by one spreading code sequence selected from the multiple spreading code sequences, and
• the spreading code sequence by which the uplink physical channel is multiplied during retransmission is different from the spreading code sequence by which the uplink physical channel is multiplied during initial transmission.

A communication method for a base station apparatus for communicating with a terminal apparatus, the communication method comprising:

• a first step of transmitting a multi-access signature process index to the terminal apparatus;
• and
• a second step of receiving a demodulation reference signal and an uplink physical channel, wherein
• the multi-access signature process index associates one demodulation reference signal with multiple spreading code sequences, the transmitter transmits the uplink physical channel multiplied by one spreading code sequence selected from the multiple spreading code sequences, and
• the spreading code sequence by which the uplink physical channel is multiplied during retransmission is different from the spreading code sequence by which the uplink physical channel is multiplied during initial transmission.