A method for performing a Physical Uplink Shared CHannel, PUSCH, transmission by a mobile station in response to a Downlink Control Information, DCI, transmission utilizing Time Division Duplex, TDD, communication based on at least one of a plurality of uplink/downlink configurations, wherein the mobile station is configured for communication with a base station in a communication system according to a first of the plurality of uplink/downlink configurations, each of the plurality of uplink/downlink configurations defining the subframes of a radio frame as an uplink subframe, a downlink subframe or a special subframe, and wherein the mobile station applies uplink reference timing relations for the communication on the basis of a second of the plurality uplink/downlink configurations, the uplink reference timing relations defining one or plural timing relation(s) for performing one or plural PUSCH transmission(s) in response to a single DCI transmission, wherein the method comprises the following steps to be performed by the mobile station: receiving in a subframe, defined as downlink subframe or special subframe, a DCI transmission in response to which a PUSCH transmission is to be performed; determining, by applying the uplink reference timing relations, a single timing relation for a PUSCH transmission according to the subframe in which the corresponding DCI transmission is received; and performing the PUSCH transmission in a single subframe defined as an uplink subframe by the first uplink/downlink configuration, the uplink subframe corresponding to the determined single timing relation; wherein: in case the first uplink/downlink configuration, according to which the communication is configured, is different from the second uplink/downlink configuration, on the basis of which the uplink reference timing relations are defined, and in case these uplink reference timing relations define plural timing relations for performing PUSCH transmissions in response to a single DCI transmission, the mobile station applies, as part of the determining step, a pre-stored association indicating the single timing relation among the plural timing relations that is to be used for the PUSCH transmission based on the subframe in which the corresponding DCI transmission is received. receiving in a subframe, defined as downlink subframe or special subframe, a DCI transmission in response to which a PUSCH transmission is to be performed; determining, by applying the uplink reference timing relations, a single timing relation for a PUSCH transmission according to the subframe in which the corresponding DCI transmission is received; and performing the PUSCH transmission in a single subframe defined as an uplink subframe by the first uplink/downlink configuration, the uplink subframe corresponding to the determined single timing relation; wherein: in case the first uplink/downlink configuration, according to which the communication is configured, is different from the second uplink/downlink configuration, on the basis of which the uplink reference timing relations are defined, and in case these uplink reference timing relations define plural timing relations for performing PUSCH transmissions in response to a single DCI transmission, the mobile station applies, as part of the determining step, a pre-stored association indicating the single timing relation among the plural timing relations that is to be used for the PUSCH transmission based on the subframe in which the corresponding DCI transmission is received. in case the first uplink/downlink configuration, according to which the communication is configured, is different from the second uplink/downlink configuration, on the basis of which the uplink reference timing relations are defined, and in case these uplink reference timing relations define plural timing relations for performing PUSCH transmissions in response to a single DCI transmission, the mobile station applies, as part of the determining step, a pre-stored association indicating the single timing relation among the plural timing relations that is to be used for the PUSCH transmission based on the subframe in which the corresponding DCI transmission is received.