A method for detecting a discovery signal from each of multiple transmission points, TPs, the method being performed by a user equipment, UE, and comprising: when a same physical cell identifier, PCID, is commonly used by the multiple TPs, determining a scrambling identifier for the each of the multiple TPs based on the PCID and a resource element, RE, of each of discovery signals transmitted from the respective multiple TPs; and detecting the discovery signal on each position of the RE based on the determined scrambling identifier, wherein the scrambling identifier is implicitly indicated by the PCID and a configuration for the RE, wherein the multiple TPs are in a small cell cluster group, wherein the discovery signal is a reference signal which is specific to the each of the multiple TPs, wherein the discovery signal includes a discovery reference signal-primary synchronization signal, DRS-PSS, a DRS-secondary synchronization signal, DRS-SSS, and a DRS-channel state information-reference signal, DRS-CSI-RS, wherein a normal cyclic prefix, CP, is used for the UE, wherein the DRS-CSI-RS is transmitted on a subframe on which the DRS-PSS and the DRS-SSS are transmitted, wherein the DRS-PSS is transmitted on a RE which is a same RE of a legacy PSS, and the DRS-SSS is transmitted on a RE which is a same RE of a legacy SSS, wherein the DRS-CSI-RS is transmitted on a RE except for a orthogonal frequency division multiplexing, OFDM, symbol #5 and a OFDM symbol #6 on which a transmission of the DRS-PSS and the DRS-SSS is permitted in a first slot, and wherein the configuration for the RE except for a configuration for a RE which is transmitted through the OFDM symbol #5 or the OFDM symbol #6 is used for the DRS-CSI-RS. when a same physical cell identifier, PCID, is commonly used by the multiple TPs, determining a scrambling identifier for the each of the multiple TPs based on the PCID and a resource element, RE, of each of discovery signals transmitted from the respective multiple TPs; and detecting the discovery signal on each position of the RE based on the determined scrambling identifier, wherein the scrambling identifier is implicitly indicated by the PCID and a configuration for the RE, wherein the multiple TPs are in a small cell cluster group, wherein the discovery signal is a reference signal which is specific to the each of the multiple TPs, wherein the discovery signal includes a discovery reference signal-primary synchronization signal, DRS-PSS, a DRS-secondary synchronization signal, DRS-SSS, and a DRS-channel state information-reference signal, DRS-CSI-RS, wherein a normal cyclic prefix, CP, is used for the UE, wherein the DRS-CSI-RS is transmitted on a subframe on which the DRS-PSS and the DRS-SSS are transmitted, wherein the DRS-PSS is transmitted on a RE which is a same RE of a legacy PSS, and the DRS-SSS is transmitted on a RE which is a same RE of a legacy SSS, wherein the DRS-CSI-RS is transmitted on a RE except for a orthogonal frequency division multiplexing, OFDM, symbol #5 and a OFDM symbol #6 on which a transmission of the DRS-PSS and the DRS-SSS is permitted in a first slot, and wherein the configuration for the RE except for a configuration for a RE which is transmitted through the OFDM symbol #5 or the OFDM symbol #6 is used for the DRS-CSI-RS. <EOS>