The disclosure provides a method and a device in a communication node for wireless communication. The communication node first receives first information and second information, and then transmits a first radio signal in W1 time sub-window(s); the first information is used for determining X candidate time window(s), any one of the X candidate time window(s) has a time length equal to a first time length, and the first time length is fixed; for a subcarrier spacing of a subcarrier occupied by the first radio signal, one of the X candidate time window(s) comprises Y candidate time sub-window(s), and the Y is related to the subcarrier spacing of the subcarrier occupied by the first radio signal; the second information is used for indicating W candidate time sub-window(s) out of the Y candidate time sub-window(s); and each of the W1 time sub-window(s) is one of the W candidate time sub-window(s).