Terminal device, base station device, and integrated circuit to determine parameters related to demodulation reference signals (DMRS)

A base station device comprising:

• receiving circuitry configured to receive, from a terminal device, a demodulation reference signal associated with transmission of a physical uplink shared channel, a demodulation reference signal sequence of the demodulation reference signal being given by a base sequence number;
• and
• demodulating circuitry configured to demodulate the physical uplink shared channel based on the demodulation reference signal, wherein
• the base sequence number is given by a first parameter, a value of the first parameter being given by a value of first information configured by a higher layer, in a case that the value of the first information is configured by the higher layer, the transmission of the physical uplink shared channel corresponds to downlink control information to which Cyclic Redundancy Check (CRC) parity bits scrambled by a Cell-Radio Network Temporary Identifier (C-RNTI) are attached, group hopping for the demodulation reference signal is disabled, and sequence hopping for the demodulation reference signal is enabled,
• the base sequence number is given by the first parameter, a value of the first parameter being given by a physical layer cell identity, in a case that no value of the first information is configured by the higher layer, the group hopping for the demodulation reference signal is disabled, and the sequence hopping for the demodulation reference signal is enabled, and
• the base sequence number is given by the first parameter, a value of the first parameter being given by the physical layer cell identity, in a case that the transmission of the physical uplink shared channel corresponds to a random access response grant, the group hopping for the demodulation reference signal is disabled, and the sequence hopping for the demodulation reference signal is enabled.

A communication method of a terminal device comprising:

• transmitting, to a base station device, a demodulation reference signal associated with transmission of a physical uplink shared channel, a demodulation reference signal sequence of the demodulation reference signal being given by a base sequence number, wherein
• the base sequence number is given by a first parameter, a value of the first parameter being given by a value of first information configured by a higher layer, in a case that the value of the first information is configured by the higher layer, the transmission of the physical uplink shared channel corresponds to downlink control information to which Cyclic Redundancy Check (CRC) parity bits scrambled by a Cell-Radio Network Temporary Identifier (C-RNTI) are attached, group hopping for the demodulation reference signal is disabled, and sequence hopping for the demodulation reference signal is enabled,
• the base sequence number is given by the first parameter, a value of the first parameter being given by a physical layer cell identity, in a case that no value of the first information is configured by the higher layer, the group hopping for the demodulation reference signal is disabled, and the sequence hopping for the demodulation reference signal is enabled, and
• the base sequence number is given by the first parameter, a value of the first parameter being given by the physical layer cell identity, in a case that the transmission of the physical uplink shared channel corresponds to a random access response grant, the group hopping for the demodulation reference signal is disabled, and the sequence hopping for the demodulation reference signal is enabled.

A communication method of a base station device comprising:

• receiving, from a terminal device, a demodulation reference signal associated with transmission of a physical uplink shared channel, a demodulation reference signal sequence of the demodulation reference signal being given by a base sequence number, wherein
• the base sequence number is given by a first parameter, a value of the first parameter being given by a value of first information configured by a higher layer, in a case that the value of the first information is configured by the higher layer, the transmission of the physical uplink shared channel corresponds to downlink control information to which Cyclic Redundancy Check (CRC) parity bits scrambled by a Cell-Radio Network Temporary Identifier (C-RNTI) are attached, group hopping for the demodulation reference signal is disabled, and sequence hopping for the demodulation reference signal is enabled,
• the base sequence number is given by the first parameter, a value of the first parameter being given by a physical layer cell identity, in a case that no value of the first information is configured by the higher layer, the group hopping for the demodulation reference signal is disabled, and the sequence hopping for the demodulation reference signal is enabled, and
• the base sequence number is given by the first parameter, a value of the first parameter being given by the physical layer cell identity, in a case that the transmission of the physical uplink shared channel corresponds to a random access response grant, the group hopping for the demodulation reference signal is disabled, and the sequence hopping for the demodulation reference signal is enabled.

An integrated circuit device mountable on a terminal device, the integrated circuit device comprising:

• a scheduling circuit configured to generate a demodulation reference signal associated with transmission of a physical uplink shared channel, a demodulation reference signal sequence of the demodulation reference signal being given by a base sequence number;
• and
• a transmitting circuit configured to transmit the demodulation reference signal, wherein
• the base sequence number is given by a first parameter, a value of the first parameter being given by a value of first information configured by a higher layer, in a case that the value of the first information is configured by the higher layer, the transmission of the physical uplink shared channel corresponds to downlink control information to which Cyclic Redundancy Check (CRC) parity bits scrambled by a Cell-Radio Network Temporary Identifier (C-RNTI) are attached, group hopping for the demodulation reference signal is disabled, and sequence hopping for the demodulation reference signal is enabled,
• the base sequence number is given by the first parameter, a value of the first parameter being given by a physical layer cell identity, in a case that no value of the first information is configured by the higher layer, the group hopping for the demodulation reference signal is disabled, and the sequence hopping for the demodulation reference signal is enabled, and
• the base sequence number is given by the first parameter, a value of the first parameter being given by the physical layer cell identity, in a case that the transmission of the physical uplink shared channel corresponds to a random access response grant, the group hopping for the demodulation reference signal is disabled, and the sequence hopping for the demodulation reference signal is enabled.

An integrated circuit device mountable on a base station device, the integrated circuit device comprising:

• a receiving circuit configured to receive a demodulation reference signal associated with transmission of a physical uplink shared channel, a demodulation reference signal sequence of the demodulation reference signal being given by a base sequence number;
• and
• a demodulating circuit configured to demodulate the physical uplink shared channel based on the demodulation reference signal, wherein
• the base sequence number is given by a first parameter, a value of the first parameter being given by a value of first information configured by a higher layer, in a case that the value of the first information is configured by the higher layer, the transmission of the physical uplink shared channel corresponds to downlink control information to which Cyclic Redundancy Check (CRC) parity bits scrambled by a Cell-Radio Network Temporary Identifier (C-RNTI) are attached, group hopping for the demodulation reference signal is disabled, and sequence hopping for the demodulation reference signal is enabled,
• the base sequence number is given by the first parameter, a value of the first parameter being given by a physical layer cell identity, in a case that no value of the first information is configured by the higher layer, the group hopping for the demodulation reference signal is disabled, and the sequence hopping for the demodulation reference signal is enabled, and
• the base sequence number is given by the first parameter, a value of the first parameter being given by the physical layer cell identity, in a case that the transmission of the physical uplink shared channel corresponds to a random access response grant, the group hopping for the demodulation reference signal is disabled, and the sequence hopping for the demodulation reference signal is enabled.