The present disclosure provides a method and a device in a UE and a base station for wireless communications. A UE transmits a first characteristic radio signal in a first radio resource, a first sequence being used for generating the first characteristic radio signal; transmits a second characteristic radio signal in a second radio resource, a second sequence being used for generating the second characteristic radio signal; and transmits a first radio signal in a third radio resource. Herein, parameters of a channel that the first radio signal goes through are related to parameters of a channel that the second characteristic radio signal goes through; a first ID is used for determining at least one of the second sequence or the first radio signal. The presents disclosure can reduce conflicting access to the UE, thereby enhancing the capacity of access to the UE.