Disclosed are a user equipment and a base station in a wireless communications system, and a wireless communications method. The user equipment is used as a receiving-end user equipment for D2D communications, comprising: a transceiver; and one or more processing circuits configured to: cause the transceiver to receive a beacon signal sent by a sending-end user equipment for D2D communications, and decode the received beacon signal, wherein the beacon signal comprises identification information for identifying a D2D link where the sending-end user equipment is located; identify the D2D link where the sending-end user equipment is located as a neighbor D2D link of the receiving-end user equipment on the basis of the identification information in the correctly decoded beacon signal; and cause the transceiver to send the identified neighbor D2D link to a base station in a wireless communications system. By using the user equipment, the base station and the wireless communications method of the present application, a neighbor D2D link of the user equipment can be determined without obtaining the location information of the user equipment, so that resources can be allocated more reasonably.