A radio station comprising: at least one radio transceiver; and at least one processor coupled to the at least one radio transceiver, wherein the at least one processor is configured to allocate a first plurality of time-frequency resources and a second plurality of time-frequency resources to at least one radio terminal, the first plurality of time-frequency resources are used to transmit or receive a first transport block in accordance with a first transmission time interval, TTI, in a first access operation, the first TTI is equal to a duration of one subframe (410, 510), a duration of the first plurality of time-frequency resources corresponds to the duration of the subframe (410, 510), the second plurality of time-frequency resources are used to transmit or receive a second transport block in accordance with a second TTI, in a second access operation, the second TTI is shorter than the duration of the subframe (410, 510) and corresponds with an integer multiple of an Orthogonal Frequency Division Multiplexing, OFDM, symbol length, a duration of the second plurality of time-frequency resources is shorter than the duration of the subframe (410, 510), and the second TTI of the second access operation overlaps the first TTI of the first access operation in one subframe of the first access operation, wherein the radio station is characterized in that the at least one radio transceiver is further configured to: receive a scheduling request in a Physical Uplink Control Channel, PUCCH, region of a first uplink subframe, transmit uplink grant information in the last three OFDM symbols of an Enhanced PDCCH, EPDCCH, region of a first downlink subframe, the uplink grant information providing resource allocation in the second slot of a second uplink subframe consecutive to the first uplink subframe, and receive, based on the resource allocation, Physical Uplink Shared Channel, PUSCH, by one or more OFDM symbols in the second slot of the second uplink subframe, wherein the scheduling request and the uplink grant information are used to request and assign time-frequency resources for transmitting or receiving the second transport block in accordance with the second TTI. at least one radio transceiver; and at least one processor coupled to the at least one radio transceiver, wherein the at least one processor is configured to allocate a first plurality of time-frequency resources and a second plurality of time-frequency resources to at least one radio terminal, the first plurality of time-frequency resources are used to transmit or receive a first transport block in accordance with a first transmission time interval, TTI, in a first access operation, the first TTI is equal to a duration of one subframe (410, 510), a duration of the first plurality of time-frequency resources corresponds to the duration of the subframe (410, 510), the second plurality of time-frequency resources are used to transmit or receive a second transport block in accordance with a second TTI, in a second access operation, the second TTI is shorter than the duration of the subframe (410, 510) and corresponds with an integer multiple of an Orthogonal Frequency Division Multiplexing, OFDM, symbol length, a duration of the second plurality of time-frequency resources is shorter than the duration of the subframe (410, 510), and the second TTI of the second access operation overlaps the first TTI of the first access operation in one subframe of the first access operation, wherein the radio station is characterized in that the at least one radio transceiver is further configured to: receive a scheduling request in a Physical Uplink Control Channel, PUCCH, region of a first uplink subframe, transmit uplink grant information in the last three OFDM symbols of an Enhanced PDCCH, EPDCCH, region of a first downlink subframe, the uplink grant information providing resource allocation in the second slot of a second uplink subframe consecutive to the first uplink subframe, and receive, based on the resource allocation, Physical Uplink Shared Channel, PUSCH, by one or more OFDM symbols in the second slot of the second uplink subframe, receive a scheduling request in a Physical Uplink Control Channel, PUCCH, region of a first uplink subframe, transmit uplink grant information in the last three OFDM symbols of an Enhanced PDCCH, EPDCCH, region of a first downlink subframe, the uplink grant information providing resource allocation in the second slot of a second uplink subframe consecutive to the first uplink subframe, and receive, based on the resource allocation, Physical Uplink Shared Channel, PUSCH, by one or more OFDM symbols in the second slot of the second uplink subframe, wherein the scheduling request and the uplink grant information are used to request and assign time-frequency resources for transmitting or receiving the second transport block in accordance with the second TTI.