A signal transmission method, comprising the steps of: receiving, by a User Equipment, UE, a signal on a carrier or cell which uses a predetermined spectrum resource, wherein the predetermined spectrum resource is an unlicensed spectrum resource; determining whether or not the received signal belongs to a serving carrier or serving cell of the UE (S301); and in the case that the received signal belongs to the serving carrier or serving cell of the UE, performing measurement and/or data transmission by the UE in accordance with the received signal and/or a subsequently-received signal (S303); wherein the step of determining by the UE whether or not the received signal belongs to the serving carrier or serving cell comprises at least one of: detecting, by the UE, a synchronization signal corresponding to the ID of the carrier or cell in accordance with the ID of the carrier or cell pre-configured through the configuration signaling, and in response to the synchronization signal corresponding to the ID of the carrier or cell being detected, determining that the received signal belongs to the serving carrier or serving cell; detecting, by the UE, dedicated sequences corresponding to the serving carrier or serving cell of the UE or dedicated sequences for the UE pre-configured through the configuration signaling, and in response to the dedicated sequences being detected, determining that the received signal belongs to the serving carrier or serving cell. receiving, by a User Equipment, UE, a signal on a carrier or cell which uses a predetermined spectrum resource, wherein the predetermined spectrum resource is an unlicensed spectrum resource; determining whether or not the received signal belongs to a serving carrier or serving cell of the UE (S301); and in the case that the received signal belongs to the serving carrier or serving cell of the UE, performing measurement and/or data transmission by the UE in accordance with the received signal and/or a subsequently-received signal (S303); wherein the step of determining by the UE whether or not the received signal belongs to the serving carrier or serving cell comprises at least one of: detecting, by the UE, a synchronization signal corresponding to the ID of the carrier or cell in accordance with the ID of the carrier or cell pre-configured through the configuration signaling, and in response to the synchronization signal corresponding to the ID of the carrier or cell being detected, determining that the received signal belongs to the serving carrier or serving cell; detecting, by the UE, dedicated sequences corresponding to the serving carrier or serving cell of the UE or dedicated sequences for the UE pre-configured through the configuration signaling, and in response to the dedicated sequences being detected, determining that the received signal belongs to the serving carrier or serving cell. detecting, by the UE, a synchronization signal corresponding to the ID of the carrier or cell in accordance with the ID of the carrier or cell pre-configured through the configuration signaling, and in response to the synchronization signal corresponding to the ID of the carrier or cell being detected, determining that the received signal belongs to the serving carrier or serving cell; detecting, by the UE, dedicated sequences corresponding to the serving carrier or serving cell of the UE or dedicated sequences for the UE pre-configured through the configuration signaling, and in response to the dedicated sequences being detected, determining that the received signal belongs to the serving carrier or serving cell. <EOS>