Method and device in nodes used for wireless communication

A second node for wireless communications, comprising:

• a third receiver, receiving a target signaling, the target signaling being used for reserving a candidate time-frequency resource set;
• wherein a transmitter of the target signaling performs channel detection in a first time window to determine a candidate time-frequency resource pool, and the candidate time-frequency resource set belongs to the candidate time-frequency resource pool;
• the transmitter of the target signaling also receives a first signaling, the first signaling being used to determine a first time-frequency resource set;
• time-domain resources occupied by the first time-frequency resource set belong to the first time window;
• the candidate time-frequency resource set is reserved for transmission of a first TB;
• whether the channel detection comprises a detection on the first time-frequency resource set is related to a type of the first TB, or whether the channel detection comprises a detection on the first time-frequency resource set is related to a duration of the first time window in time domain.

A method in a first node for wireless communications, comprising:

• performing channel detection in a first time window to determine a candidate time-frequency resource pool;
• receiving a first signaling, the first signaling being used to determine a first time-frequency resource set;
• and
• transmitting a target signaling, the target signaling being used to reserve a candidate time-frequency resource set;
• wherein the candidate time-frequency resource pool comprises the candidate time-frequency resource set;
• time-domain resources occupied by the first time-frequency resource set belong to the first time window;
• the candidate time-frequency resource set is reserved for transmission of a first transport block (TB);
• whether the channel detection comprises a detection on the first time-frequency resource set is related to a type of the first TB, or whether the channel detection comprises a detection on the first time-frequency resource set is related to a duration of the first time window in time domain.