A method of operating a terminal device (406, 408) in a wireless telecommunications system for communicating with network infrastructure equipment on a primary cell supporting a primary component carrier on radio resources within a first frequency band and a secondary cell supporting a secondary component carrier on radio resources within a second frequency band, wherein the method comprises: determining a plurality of configuration settings for the secondary component carrier from a table of potential configuration settings established according to an operating standard for the wireless telecommunications system; receiving from the network infrastructure equipment an allocation message indicating an allocation of transmission resources to be used for communicating data between the network infrastructure equipment and the terminal device on the secondary component carrier; receiving from the network infrastructure equipment in the allocation message an indication of a selected one of the plurality of configuration settings for the secondary component carrier to be used for communicating the data, wherein the indication comprises a pointer to an entry in the table of potential configuration settings established according to an operating standard for the wireless telecommunications system; receiving the data from the network infrastructure equipment using the allocated resources on the secondary component carrier operating in accordance with the selected one of the plurality of configuration settings; receiving from the network infrastructure equipment a further allocation message indicating a further allocation of transmission resources to be used for communicating further data between the network infrastructure equipment and the terminal device on the secondary component carrier; receiving from the network infrastructure equipment in the further allocation message a further indication of another selected one of the plurality of configuration settings for the secondary component carrier to be used for communicating the further data; and receiving the further data from the network infrastructure equipment using the further allocated resources on the secondary component carrier operating in accordance with the other selected one of the plurality of configuration settings; wherein the potential configuration settings for the secondary component carrier comprise indications of potential time resources to be used for the secondary component carrier. determining a plurality of configuration settings for the secondary component carrier from a table of potential configuration settings established according to an operating standard for the wireless telecommunications system; receiving from the network infrastructure equipment an allocation message indicating an allocation of transmission resources to be used for communicating data between the network infrastructure equipment and the terminal device on the secondary component carrier; receiving from the network infrastructure equipment in the allocation message an indication of a selected one of the plurality of configuration settings for the secondary component carrier to be used for communicating the data, wherein the indication comprises a pointer to an entry in the table of potential configuration settings established according to an operating standard for the wireless telecommunications system; receiving the data from the network infrastructure equipment using the allocated resources on the secondary component carrier operating in accordance with the selected one of the plurality of configuration settings; receiving from the network infrastructure equipment a further allocation message indicating a further allocation of transmission resources to be used for communicating further data between the network infrastructure equipment and the terminal device on the secondary component carrier; receiving from the network infrastructure equipment in the further allocation message a further indication of another selected one of the plurality of configuration settings for the secondary component carrier to be used for communicating the further data; and receiving the further data from the network infrastructure equipment using the further allocated resources on the secondary component carrier operating in accordance with the other selected one of the plurality of configuration settings; wherein the potential configuration settings for the secondary component carrier comprise indications of potential time resources to be used for the secondary component carrier.