A method in a radio access network, RAN, the radio access network comprising one or more user equipments, UEs, and one or more network nodes, to determine capabilities of a UE out of the one or more UEs in the RAN, the method comprising: transmitting from the UE and receiving in a network node out of the one or more network nodes, an information element describing a plurality of feature sets supported by the UE, the information element comprising: one or more InitialFeatureLists, wherein: each InitialFeatureList includes one or more non-extensible InitialFeatureSet elements, and each non-extensible InitialFeatureSet element indicates the UE's support for one or more initial features; one or more ExtensionFeatureLists, wherein: each ExtensionFeatureList is associated with a particular InitialFeatureList, each ExtensionFeatureList includes one or more ExtensionFeatureSet elements, and each ExtensionFeatureSet element indicates the UE's support for one or more extension features; transmitting from the UE and receiving by the network node, one or more BandCombination information elements, wherein each BandCombination information element includes: a list of frequency bands in which the UE can concurrently transmit and/or receive information; and a FeatureSetCombination element that identifies features supported by the UE within each frequency band included in the list, wherein the features supported by the UE within a particular frequency band are based on: a particular InitialFeatureSet element from each InitialFeatureList, and a corresponding ExtensionFeatureSet element from the ExtensionFeatureList associated with each InitialFeatureList; the network node determining the UE's capabilities based on the received one or more BandCombination information elements and the received information describing the plurality of feature sets supported by the UE. transmitting from the UE and receiving in a network node out of the one or more network nodes, an information element describing a plurality of feature sets supported by the UE, the information element comprising: one or more InitialFeatureLists, wherein: each InitialFeatureList includes one or more non-extensible InitialFeatureSet elements, and each non-extensible InitialFeatureSet element indicates the UE's support for one or more initial features; one or more ExtensionFeatureLists, wherein: each ExtensionFeatureList is associated with a particular InitialFeatureList, each ExtensionFeatureList includes one or more ExtensionFeatureSet elements, and each ExtensionFeatureSet element indicates the UE's support for one or more extension features; one or more InitialFeatureLists, wherein: each InitialFeatureList includes one or more non-extensible InitialFeatureSet elements, and each non-extensible InitialFeatureSet element indicates the UE's support for one or more initial features; each InitialFeatureList includes one or more non-extensible InitialFeatureSet elements, and each non-extensible InitialFeatureSet element indicates the UE's support for one or more initial features; one or more ExtensionFeatureLists, wherein: each ExtensionFeatureList is associated with a particular InitialFeatureList, each ExtensionFeatureList includes one or more ExtensionFeatureSet elements, and each ExtensionFeatureSet element indicates the UE's support for one or more extension features; each ExtensionFeatureList is associated with a particular InitialFeatureList, each ExtensionFeatureList includes one or more ExtensionFeatureSet elements, and each ExtensionFeatureSet element indicates the UE's support for one or more extension features; transmitting from the UE and receiving by the network node, one or more BandCombination information elements, wherein each BandCombination information element includes: a list of frequency bands in which the UE can concurrently transmit and/or receive information; and a FeatureSetCombination element that identifies features supported by the UE within each frequency band included in the list, wherein the features supported by the UE within a particular frequency band are based on: a particular InitialFeatureSet element from each InitialFeatureList, and a corresponding ExtensionFeatureSet element from the ExtensionFeatureList associated with each InitialFeatureList; a list of frequency bands in which the UE can concurrently transmit and/or receive information; and a FeatureSetCombination element that identifies features supported by the UE within each frequency band included in the list, wherein the features supported by the UE within a particular frequency band are based on: a particular InitialFeatureSet element from each InitialFeatureList, and a corresponding ExtensionFeatureSet element from the ExtensionFeatureList associated with each InitialFeatureList; a particular InitialFeatureSet element from each InitialFeatureList, and a corresponding ExtensionFeatureSet element from the ExtensionFeatureList associated with each InitialFeatureList; the network node determining the UE's capabilities based on the received one or more BandCombination information elements and the received information describing the plurality of feature sets supported by the UE.