Terminal apparatus, base station apparatus, and communication method

A base station apparatus configured to communicate with a terminal apparatus supporting a handover from a source cell to a target cell, the base station apparatus comprising:

• a transmitter configured to transmit a higher layer information mobilityControlInfo including a first uplink grant and a subframe allocation information different from the first uplink grant, the subframe allocation information indicating a set of one or more subframes that is of a plurality of subframes included in each radio frame, and the set of one or more subframes being equally allocated in every radio frame;
• and
• a receiver configured to receive a transmission of a first data transmitted by the terminal apparatus based on the first uplink grant in one subframe of the set of one or more subframes, wherein
• the receiver receives the first data based on a first redundancy version, the first redundancy version being set to 0 in a case that a first physical downlink control channel for the first data is not received by the terminal apparatus, and the first redundancy version for retransmission is a fixed value of 0 based on that an uplink grant used for retransmission is the first uplink grant, and
• the transmitter transmits a second physical downlink control channel including a second uplink grant different from the first uplink grant, the receiver performs a reception of a second data based on the second uplink grant, and the receiver receives the second data based on a second redundancy version corresponding to a variable updated each time the second data is retransmitted based on the second uplink grant, in a case that a third physical downlink control channel for the second data is not received by the terminal apparatus.

A communication method for a terminal apparatus to be handed over from a source cell to a target cell, the communication method comprising:

• receiving a higher layer information mobilityControlInfo including a first uplink grant and a subframe allocation information different from the first uplink grant, the subframe allocation information indicating a set of one or more subframes that is of a plurality of subframes included in each radio frame, and the set of one or more subframes being equally allocated in every radio frame;
• and
• performing a transmission of a first data based on the first uplink grant in one subframe of the set of one or more subframes, wherein
• retransmitting the first data based on a first redundancy version, the first redundancy version being set to 0 in a case that a first physical downlink control channel for the first data is not received, and the first redundancy version for retransmission is a fixed value of 0 based on that an uplink grant used for retransmission is the first uplink grant, and
• receiving a second physical downlink control channel including a second uplink grant different from the first uplink grant, performing a transmission of a second data based on the second uplink grant, and retransmitting the second data based on a second redundancy version corresponding to a variable updated each time the second data is retransmitted based on the second uplink grant, in a case that a third physical downlink control channel for the second data is not received.

A communication method for a base station apparatus to communicate with a terminal apparatus supporting a handover from a source cell to a target cell, the communication method comprising:

• transmitting a higher layer information mobilityControlInfo including a first uplink grant and a subframe allocation information different from the first uplink grant, the subframe allocation information indicating a set of one or more subframes that is of a plurality of subframes included in each radio frame, and the set of one or more subframes being equally allocated in every radio frame;
• and
• receiving a transmission of a first data transmitted by the terminal apparatus based on the first uplink grant in one subframe of the set of one or more subframes, wherein
• receiving the first data based on a first redundancy version, the first redundancy version being set to 0 in a case that a first physical downlink control channel for the first data is not received by the terminal apparatus, and the first redundancy version for retransmission is a fixed value of 0 based on that an uplink grant used for retransmission is the first uplink grant, and
• transmitting a second physical downlink control channel including a second uplink grant different from the first uplink grant, performing a reception of a second data based on the second uplink grant, and receiving the second data based on a second redundancy version corresponding to a variable updated each time the second data is retransmitted based on the second uplink grant, in a case that a third physical downlink control channel for the second data is not received by the terminal apparatus.