A method for a user equipment, UE, to advertise UE capabilities to a network node in a New Radio radio access network, NR RAN, the method comprising: transmitting, to the network node, 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 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 features; transmitting, to 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. transmitting, to the network node, 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 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 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 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 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 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 features; transmitting, to 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.