Method and device used in wireless communication nodes

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

• transmitting a first radio signal;
• and
• monitoring a first-type signaling on a first radio resource, or, monitoring a second-type signaling on a second radio resource;
• wherein the first-type signaling is used for indicating that the first radio signal is correctly received, and the second-type signaling is used for indicating that the first radio signal is not correctly received;
• time-domain resources occupied by the first radio resource and time-domain resources occupied by the second radio resource are orthogonal.

A first node for wireless communications, comprising:

• a first receiver:
• receiving a first radio signal;
• and
• a first transmitter:
• transmitting a first-type signaling on a first radio resource, the first-type signaling being used for indicating that the first radio signal is correctly received;
• or, transmitting a second-type signaling on a second radio resource, the second-type signaling being used for indicating that the first radio signal is not correctly received;
• wherein time-domain resources occupied by the first radio resource and time-domain resources occupied by the second radio resource are orthogonal.

A second node for wireless communications, comprising:

• a second transmitter:
• transmitting a first radio signal;
• and
• a second receiver:
• monitoring a first-type signaling on a first radio resource, or, monitoring a second-type signaling on a second radio resource;
• wherein the first-type signaling is used for indicating that the first radio signal is correctly received, and the second-type signaling is used for indicating that the first radio signal is not correctly received;
• time-domain resources occupied by the first radio resource and time-domain resources occupied by the second radio resource are orthogonal.