Terminal device, base station device, integrated circuit, and communication method

A base station device comprising:

• transmission circuitry configured and/or programmed to transmit a control channel including a downlink control information (DCI) format;
• and
• reception circuitry configured and/or programmed to receive a physical uplink shared channel (PUSCH);
• wherein, the DCI format including an uplink index and information for indicating a hybrid automatic repeat request (HARQ) process number,
• in a case that both a first bit and a second bit of the uplink index are set to 1, the HARQ process number of the PUSCH corresponding to the first bit being X and the HARQ process number of the PUSCH corresponding to the second bit being mod (X+1, Z),
• the mod (X+1, Z) being a function outputting a remainder when dividing (X+1) by Z,
• the X being determined based on the information for indicating the HARQ process number, and
• the Z being a value identical to a maximum number of HARQ processes in a serving cell determined by an uplink/downlink configuration.

A communication method for a terminal device, the communication method comprising:

• receiving a control channel including a downlink control information (DCI) format;
• and
• transmitting a physical uplink shared channel (PUSCH);
• wherein, the DCI format including an uplink index and information for indicating a hybrid automatic repeat request (HARQ) process number,
• in a case that both a first bit and a second bit of the uplink index are set to 1, the HARQ process number of the PUSCH corresponding to the first bit being X and the HARQ process number of the PUSCH corresponding to the second bit being mod (X+1, Z),
• the mod (X+1, Z) being a function outputting a remainder when dividing (X+1) by Z,
• the X being determined based on the information for indicating the HARQ process number, and
• the Z being a value identical to a maximum number of HARQ processes in a serving cell determined by an uplink/downlink configuration.

A communication method for a base station device, the communication method comprising:

• transmitting a control channel including a downlink control information (DCI) format;
• and
• receiving a physical uplink shared channel (PUSCH);
• wherein, the DCI format including an uplink index and information for indicating a hybrid automatic repeat request (HARQ) process number,
• in a case that both a first bit and a second bit of the uplink index are set to 1, the HARQ process number of the PUSCH corresponding to the first bit being X and the HARQ process number of the PUSCH corresponding to the second bit being mod (X+1, Z),
• the mod (X+1, Z) being a function outputting a remainder when dividing (X+1) by Z,
• the X being determined based on the information for indicating the HARQ process number, and
• the Z being a value identical to a maximum number of HARQ processes in a serving cell determined by an uplink/downlink configuration.