A multiple transmission occasion-based Unlicensed Band, Uband, reference signal sending method, the method comprising: sensing , by an Evolved Node B, eNB, whether the Uband channel is idle or not at all or part of candidate transmission positions, and determining idle candidate transmission positions; and selecting to send , by the eNB, a reference signal to a User Equipment, UE, at all or part of the idle candidate transmission positions on the Uband channel according to historical Uband channel contention state information, wherein the historical Uband channel contention state information reflects a Uband channel contention condition, said condition being an actual Uband reference signal sending density, wherein the eNB configures and transmits all possible transmission opportunities for the reference signal as Measurement gaps of the UE and the UE being expected to receive the Uband reference signal on configured Measurement Gaps, and sending, by the eNB, the reference signal to the UE through part or all of the idle candidate transmission positions on the Uband channel selected according to the historical Uband channel contention state information, wherein the actual Uband reference signal sending density is represented by a ratio of a number of sending times of the reference signal in a certain statistical period to a time length of the statistical period; wherein the Uband channel comprises multiple predetermined candidate transmission positions for transmitting the reference signal and each candidate transmission position is a transmission occasion for the reference signal, wherein multiple sets of measurement gaps transmission patterns are configured and signaled by the eNB to the UE in a discovery signals measurement timing configuration, DMTC, window, wherein each set in the multiple sets of transmission patterns consists of the multiple predetermined candidate transmission positions, and each of the multiple predetermined candidate transmission positions falls within the DMTC window. sensing , by an Evolved Node B, eNB, whether the Uband channel is idle or not at all or part of candidate transmission positions, and determining idle candidate transmission positions; and selecting to send , by the eNB, a reference signal to a User Equipment, UE, at all or part of the idle candidate transmission positions on the Uband channel according to historical Uband channel contention state information, wherein the historical Uband channel contention state information reflects a Uband channel contention condition, said condition being an actual Uband reference signal sending density, wherein the eNB configures and transmits all possible transmission opportunities for the reference signal as Measurement gaps of the UE and the UE being expected to receive the Uband reference signal on configured Measurement Gaps, and sending, by the eNB, the reference signal to the UE through part or all of the idle candidate transmission positions on the Uband channel selected according to the historical Uband channel contention state information, wherein the actual Uband reference signal sending density is represented by a ratio of a number of sending times of the reference signal in a certain statistical period to a time length of the statistical period; wherein the Uband channel comprises multiple predetermined candidate transmission positions for transmitting the reference signal and each candidate transmission position is a transmission occasion for the reference signal, wherein multiple sets of measurement gaps transmission patterns are configured and signaled by the eNB to the UE in a discovery signals measurement timing configuration, DMTC, window, wherein each set in the multiple sets of transmission patterns consists of the multiple predetermined candidate transmission positions, and each of the multiple predetermined candidate transmission positions falls within the DMTC window. <EOS>