The embodiment of the invention provides a method and
base station for transmitting and receiving signals by using unauthorized carrier
waves and
user equipment. The method includes the steps that the
base station transmits unauthorized carrier wave information to the
user equipment (UE) through authorized carrier
waves; after obtaining the use right to the unauthorized carrier
waves through competition in a competition backspacing window, the
base station uses residual resources and / or subframes behind the residual resources in the competition backspacing window for transmitting the signals to the UE, and the residual resources comprise complete orthogonal frequency-division
multiplexing (OFDM) symbols after the moment point of obtaining the use right of the unauthorized carrier waves through competition and located in the competition backspacing window, or complete PFDM symbols between the moment point of obtaining the use right of the unauthorized carrier waves for the base
station through competition and the moment when the
subframe where the moment point is located is finished.