Terminal and communication method

1 . A terminal that is a first terminal, comprising:

a receiver configured to receive first reservation information for reserving a first resource from a second terminal and receive second reservation information for reserving a second resource from a third terminal;

a processor configured to determine whether a specific condition is satisfied, the specific condition being based on: a first time from reception of the first reservation information or the second reservation information to a resource for transmitting information related to a collision between the first resource and the second resource; and a second time from the resource for transmitting the information related to the collision to a resource in which the collision may occur; and

a transmitter configured to transmit the information related to the collision in a case where the processor determines that the specific condition is satisfied,

wherein the specific condition is the first time being equal to or greater than a predetermined value provided by an upper layer parameter and the second time being equal to or greater than a predetermined value corresponding to a subcarrier spacing.

2 . The terminal as claimed in claim 1 , wherein

the processor determines a destination terminal of the information related to the collision based on whether or not the first time is equal to or greater than a predetermined value provided by an upper layer parameter.

3 . The terminal as claimed in claim 1 , wherein

the processor determines a destination terminal of the information related to the collision based on whether or not an inter-terminal coordination operation can be performed.

4 . The terminal as claimed in claim 1 , wherein

the processor determines a destination terminal of the information related to the collision based on a priority related to the first reservation information and a priority related to the second reservation information.

5 . The terminal as claimed in claim 2 , wherein

the transmitter transmits the information related to the collision via a feedback channel for communication between terminals.

6 . A terminal that is a second terminal, comprising:

a transmitter configured to transmit first reservation information for reserving a first resource;

a receiver configured to receive, in a case where a specific condition based on: a first time from reception of the first reservation information or second reservation information transmitted from a third terminal to a resource for transmitting information related to a collision between the first resource and a second resource reserved by the second reservation information; and a second time from the resource for transmitting the information related to the collision to a resource in which the collision may occur is satisfied at a first terminal, the information related to the collision from the first terminal; and

a processor configured to control reselection of a resource used for communication between terminals based on the information related to the collision,

wherein the specific condition is the first time being equal to or greater than a predetermined value provided by an upper layer parameter and the second time being equal to or greater than a predetermined value corresponding to a subcarrier spacing.

7 . The terminal as claimed in claim 6 , wherein

the processor controls at least one of reselecting the resource or dropping the resource based on a resource allocation mode of the second terminal.

8 . A method performed by a first terminal, comprising:

receiving first reservation information for reserving a first resource from a second terminal and receiving second reservation information for reserving a second resource from a third terminal;

determining whether a specific condition based on: a first time from reception of the first reservation information to transmission of information related to a collision between the first resource and the second resource; and a second time from the transmission of the information related to the collision to a resource in which the collision occurs is satisfied; and

transmitting the information related to the collision to a specific terminal in a case where the specific condition is determined to be satisfied,

wherein the specific condition is the first time being equal to or greater than a predetermined value provided by an upper layer parameter and the second time being equal to or greater than a predetermined value corresponding to a subcarrier spacing.

9 . The terminal as claimed in claim 2 , wherein

the processor determines a destination terminal of the information related to the collision based on whether or not an inter-terminal coordination operation can be performed.

10 . The terminal as claimed in claim 2 , wherein

the processor determines a destination terminal of the information related to the collision based on a priority related to the first reservation information and a priority related to the second reservation information.

11 . The terminal as claimed in claim 3 , wherein

the processor determines a destination terminal of the information related to the collision based on a priority related to the first reservation information and a priority related to the second reservation information.

12 . The terminal as claimed in claim 3 , wherein

the transmitter transmits the information related to the collision via a feedback channel for communication between terminals.

13 . The terminal as claimed in claim 4 , wherein

the transmitter transmits the information related to the collision via a feedback channel for communication between terminals.