A method in a user equipment, UE, for wireless communications, comprising: receiving (S21) Q control signaling groups respectively in Q time windows, any of the Q control signaling groups comprising a positive integer number of control signaling(s); receiving (S22) a first control signaling, the first control signaling indicating Q1 time window(s) out of the Q time windows; and performing (S101) energy detection so as to determine whether a transmission can be performed on a first time-frequency resource; if yes, (S102) a first radio signal is transmitted in the first time-frequency resource, otherwise a transmission of the first radio signal is dropped in the first time-frequency resource; wherein any two time windows of the Q time windows are orthogonal in time domain; any control signaling comprised by the Q control signaling groups comprises a first field; for every of the Q control signaling groups, first fields comprised in all the control signalings within every signaling group are of a same value; among any Q2 adjacent control signaling groups of the Q control signaling groups, any two control signaling groups comprise first fields of different values; the first radio signal comprises first feedback information, the first feedback information is used for determining whether bit blocks transmitted in the Q1 time window(s) are correctly decoded, the Q is a positive integer greater than 1, and the Q1 and the Q2 are respectively positive integers no greater than the Q; any control signaling in any control signaling group among the Q control signaling groups is a piece of DCI, Download Control Information. receiving (S21) Q control signaling groups respectively in Q time windows, any of the Q control signaling groups comprising a positive integer number of control signaling(s); receiving (S22) a first control signaling, the first control signaling indicating Q1 time window(s) out of the Q time windows; and performing (S101) energy detection so as to determine whether a transmission can be performed on a first time-frequency resource; if yes, (S102) a first radio signal is transmitted in the first time-frequency resource, otherwise a transmission of the first radio signal is dropped in the first time-frequency resource; wherein any two time windows of the Q time windows are orthogonal in time domain; any control signaling comprised by the Q control signaling groups comprises a first field; for every of the Q control signaling groups, first fields comprised in all the control signalings within every signaling group are of a same value; among any Q2 adjacent control signaling groups of the Q control signaling groups, any two control signaling groups comprise first fields of different values; the first radio signal comprises first feedback information, the first feedback information is used for determining whether bit blocks transmitted in the Q1 time window(s) are correctly decoded, the Q is a positive integer greater than 1, and the Q1 and the Q2 are respectively positive integers no greater than the Q; any control signaling in any control signaling group among the Q control signaling groups is a piece of DCI, Download Control Information. <EOS>