User Equipment, UE, for communicating with a Long-Term Evolution, LTE, network (110, 112, 114), the UE comprising: a wireless communications module operable in a Frequency Division Duplexing, FDD, mode and a Time Division Duplexing, TDD, mode; wherein the UE is arranged to: transmit capability information related to capabilities or feature groups supported by the UE to the network (110, 112, 114) via the wireless communications module, the capability information including at least a first part including first information about at least one capability or feature group that is supported by the UE in both the FDD and TDD modes; include a second extension part in the capability information, the second extension part including second information about at least one capability or feature group that is supported by the UE in the FDD mode in addition to the first information, if the UE supports at least one capability in the FDD mode but not in the TDD mode; and include a third extension part in the capability information, the third extension part including third information about at least one capability or feature group that is supported by the UE in the TDD mode in addition to the first information, if the UE supports at least one capability in the TDD mode but not in the FDD mode; wherein the first part of the capability information can be processed by a legacy RAN node, and the second or third extension parts (520a, 520b) of the capability information can not be processed by the legacy RAN node. a wireless communications module operable in a Frequency Division Duplexing, FDD, mode and a Time Division Duplexing, TDD, mode; wherein the UE is arranged to: transmit capability information related to capabilities or feature groups supported by the UE to the network (110, 112, 114) via the wireless communications module, the capability information including at least a first part including first information about at least one capability or feature group that is supported by the UE in both the FDD and TDD modes; include a second extension part in the capability information, the second extension part including second information about at least one capability or feature group that is supported by the UE in the FDD mode in addition to the first information, if the UE supports at least one capability in the FDD mode but not in the TDD mode; and include a third extension part in the capability information, the third extension part including third information about at least one capability or feature group that is supported by the UE in the TDD mode in addition to the first information, if the UE supports at least one capability in the TDD mode but not in the FDD mode; transmit capability information related to capabilities or feature groups supported by the UE to the network (110, 112, 114) via the wireless communications module, the capability information including at least a first part including first information about at least one capability or feature group that is supported by the UE in both the FDD and TDD modes; include a second extension part in the capability information, the second extension part including second information about at least one capability or feature group that is supported by the UE in the FDD mode in addition to the first information, if the UE supports at least one capability in the FDD mode but not in the TDD mode; and include a third extension part in the capability information, the third extension part including third information about at least one capability or feature group that is supported by the UE in the TDD mode in addition to the first information, if the UE supports at least one capability in the TDD mode but not in the FDD mode; wherein the first part of the capability information can be processed by a legacy RAN node, and the second or third extension parts (520a, 520b) of the capability information can not be processed by the legacy RAN node.