A method in a User Equipment, UE, for wireless communications, comprising: receiving T first-type radio signals by the UE, T being a positive integer greater than 1; performing T access detections respectively on T sub-bands by the UE, and transmitting T second-type radio signals respectively in T time-frequency resource blocks by the UE; wherein the T sub-bands comprise at least one same frequency point, or the T sub-bands belong to a same carrier, a bandwidth of any of the T sub-bands is equal to or smaller than a bandwidth of a carrier to which the T sub-bands belong; the T access detections are respectively used for determining transmissions of the T second-type radio signals; the T first-type radio signals are respectively associated with the T second-type radio signals; a reference first-type radio signal is one of the T first-type radio signals, a reference second-type radio signal is one of the T second-type radio signals associated with the reference first-type radio signal, and the reference second-type radio signal comprises V sub-signal(s), V being a positive integer; the reference first-type radio signal comprises a first field, the first field comprised in the reference first-type radio signal is a New Data Indicator, and the first field comprised in the reference first-type radio signal indicates whether the V sub-signal(s) comprises(comprise) new data; receiving a first information by the UE, the first information comprising scheduling information of the third-type radio signal; performing Q energy detection(s) respectively in Q time sub-pool(s) on a first sub-band by the UE, through which Q detection value(s) is(are) obtained, Q being a positive integer; wherein a bandwidth of the first sub-band is smaller than that of a carrier to which the first sub-band belongs; at least one sub-band of the T sub-bands is different from the first sub-band, and the Q energy detection(s) is/are used for determining that the first sub-band is idle; the Q is related only to the reference first-type radio signal of the T first-type radio signals; whether the V sub-signal(s) comprises(comprise) new data is used by the UE for determining the Q; a reference sub-band is one of the T sub-bands corresponding to the reference first-type radio signal, and a reference time-frequency resource block is one of the T time-frequency resource blocks corresponding to the reference first-type radio signal; selection of the reference time-frequency resource block is related to at least one of the first sub-band or the reference sub-band; and transmitting a third-type radio signal in the first sub-band by the UE; wherein frequency-domain resources occupied by the third-type radio signal belong to the first sub-band; a start time of time-domain resources occupied by the third-type radio signal is no earlier than an end time of the Q time sub-pool(s). receiving T first-type radio signals by the UE, T being a positive integer greater than 1; performing T access detections respectively on T sub-bands by the UE, and transmitting T second-type radio signals respectively in T time-frequency resource blocks by the UE; wherein the T sub-bands comprise at least one same frequency point, or the T sub-bands belong to a same carrier, a bandwidth of any of the T sub-bands is equal to or smaller than a bandwidth of a carrier to which the T sub-bands belong; the T access detections are respectively used for determining transmissions of the T second-type radio signals; the T first-type radio signals are respectively associated with the T second-type radio signals; a reference first-type radio signal is one of the T first-type radio signals, a reference second-type radio signal is one of the T second-type radio signals associated with the reference first-type radio signal, and the reference second-type radio signal comprises V sub-signal(s), V being a positive integer; the reference first-type radio signal comprises a first field, the first field comprised in the reference first-type radio signal is a New Data Indicator, and the first field comprised in the reference first-type radio signal indicates whether the V sub-signal(s) comprises(comprise) new data; receiving a first information by the UE, the first information comprising scheduling information of the third-type radio signal; performing Q energy detection(s) respectively in Q time sub-pool(s) on a first sub-band by the UE, through which Q detection value(s) is(are) obtained, Q being a positive integer; wherein a bandwidth of the first sub-band is smaller than that of a carrier to which the first sub-band belongs; at least one sub-band of the T sub-bands is different from the first sub-band, and the Q energy detection(s) is/are used for determining that the first sub-band is idle; the Q is related only to the reference first-type radio signal of the T first-type radio signals; whether the V sub-signal(s) comprises(comprise) new data is used by the UE for determining the Q; a reference sub-band is one of the T sub-bands corresponding to the reference first-type radio signal, and a reference time-frequency resource block is one of the T time-frequency resource blocks corresponding to the reference first-type radio signal; selection of the reference time-frequency resource block is related to at least one of the first sub-band or the reference sub-band; and transmitting a third-type radio signal in the first sub-band by the UE; wherein frequency-domain resources occupied by the third-type radio signal belong to the first sub-band; a start time of time-domain resources occupied by the third-type radio signal is no earlier than an end time of the Q time sub-pool(s).