Terminal and communication method

A communication method performed by a terminal, the communication method comprising:

• receiving, from a base station, information indicating an offset between:
• a first timing of receiving a retransmission control related response corresponding to a physical shared channel from another terminal in a first channel for direct communication between terminals, and
• a second timing of transmitting the retransmission control related response to the base station in a second channel for communication between the terminal and the base station;
• assuming that a slot index of the direct communication between terminals is same as a slot index of the communication between the terminal and the base station and that a slot boundary of the direct communication between terminals is same as a slot boundary of the communication between the terminal and the base station, and
• determining a second timing of the second channel, based on the first timing of the first channel and the information indicating the offset;
• and
• transmitting the retransmission control related response to the base station in the second channel.

A base station comprising:

• a transmission unit configured to transmit, to a terminal, information indicating an offset between:
• a first timing of receiving, by a terminal, a retransmission control related response corresponding to a physical shared channel in a first channel for direct communication between terminals, and
• a second timing of transmitting, by the terminal, the retransmission control related response to the base station in a second channel for communication between the terminal and the base station;
• a control unit configured to:
• assume that a slot index of the direct communication between terminals is same as a slot index of the communication between the terminal and the base station and that a slot boundary of the direct communication between terminals is same as a slot boundary of the communication between the terminal and the base station, and
• configure a second timing of the second channel, based on the first timing of the first channel and the offset;
• and
• a reception unit configured to receive the retransmission control related response from the terminal in the second channel.

A wireless communication system comprising:

• a plurality of terminals performing direct communication between the terminals;
• and a base station, wherein
• a terminal includes:
• a reception unit configured to receive, from the base station, information indicating an offset between:
• a first timing of receiving a retransmission control related response corresponding to a physical shared channel from another terminal in a first channel for direct communication between terminals, and
• a second timing of transmitting the retransmission control related response to the base station in a second channel for communication between the terminal and the base station;
• a control unit configured to:
• assume that a slot index of the direct communication between terminals is same as a slot index of the communication between the terminal and the base station and that a slot boundary of the direct communication between terminals is same as a slot boundary of the communication between the terminal and the base station, and
• determine a second timing of the second channel, based on the first timing of the first channel and the information indicating the offset;
• and
• a transmission unit configured to transmit the retransmission control related response to the base station in the second channel, and
• the base station includes:
• a transmission unit configured to transmit, to the terminal, the information indicating the offset;
• a control unit configured to:
• assume that a slot index of the direct communication between terminals is same as a slot index of the communication between the terminal and the base station and that a slot boundary of the direct communication between terminals is same as a slot boundary of the communication between the terminal and the base station, and
• configure a second timing of the second channel, based on the first timing of the first channel and the offset;
• and
• a reception unit configured to receive the retransmission control related response from the terminal in the second channel.