Granted Patent B2

US 12,634,043 · App. 17/796,046 · Granted May 19, 2026

Inventors: Shohei Yoshioka (Tokyo, JP); Satoshi Nagata (Tokyo, JP)

Assignee: NTT DOCOMO, INC.

H04L1/1607H04L1/1812

Abstract

Claims (30)

1 . A terminal comprising:

a receiver configured to receive configuration information by a higher layer signaling from a base station;

a processor configured to set:

a parameter which determines a sequence group that is applied to a response associated with a retransmission control in terminal-to-terminal communication, based on the configuration information, or

a fixed value; and

a transmitter configured to transmit the response in response to data received from another terminal to the another terminal,

wherein when an operation of transmitting the response to the another terminal is a feedback operation of transmitting only a NACK, a cyclic shift corresponding to an ACK is not defined, and the processor is configured to determine a cyclic shift corresponding to the NACK based on a layer 1 source ID of the another terminal, and

wherein, in a situation where the receiver receives multiple retransmissions of the data, the transmitter does not transmit the response to the another terminal.

2 . The terminal as claimed in claim 1 , wherein

the processor generates a sequence of the response, based on the determined sequence group, and

the transmitter transmits the response to the another terminal by applying, to the sequence, the cyclic shift in accordance with the response in response to the data received from the another terminal.

3 . The terminal as claimed in claim 1 , wherein the processor sets a value of the fixed value to be 0.

4 . A communication method of a terminal, comprising:

receiving configuration information by a higher layer from a base station;

setting:

a parameter which determines a sequence group that is applied to a response associated with a retransmission control in terminal-to-terminal communication, based on the configuration information, or

a fixed value; and

transmitting the response in response to data received from another terminal to the another terminal,

wherein when an operation of transmitting the response to the another terminal is a feedback operation of transmitting only a NACK, a cyclic shift corresponding to an ACK is not defined, and a cyclic shift corresponding to the NACK is determined based on a layer 1 source ID of the another terminal, and

wherein, in a situation where the terminal receives multiple retransmissions of the data, the terminal does not transmit the response to the another terminal.

5 . A communication system comprising: a base station; and a terminal, wherein

the base station includes a transmitter configured to transmit configuration information by a higher layer signaling to the terminal, and

the terminal includes:

a receiver configured to receive the configuration information from the base station;

a processor configured to set:

a parameter which determines a sequence group that is applied to a response associated with a retransmission control in terminal-to-terminal communication, based on the configuration information, or

a fixed value; and

a transmitter configured to transmit the response in response to data received from another terminal to the another terminal,

wherein when an operation of transmitting the response to the another terminal is a feedback operation of transmitting only a NACK, a cyclic shift corresponding to an ACK is not defined, and the processor is configured to determine a cyclic shift corresponding to the NACK based on a layer 1 source ID of the another terminal, and

wherein, in a situation where the receiver receives multiple retransmissions of the data, the transmitter does not transmit the response to the another terminal.

Assignments (1)

Continuity (1)

References Cited (31)