Certain examples of the present disclosure relate to an apparatus (110) comprising means for: receiving Ultra-Wideband, UWB, Reference Signal, RS, configuration information (503), wherein the UWB RS configuration information comprises information for configuring a transmission or a reception of a UWB RS 508 by the apparatus (110) to or from at least one node of a Radio Access Network, RAN 120; and based at least in part on the received UWB RS configuration information (503), causing transmission or reception of the UWB RS 508 to or from the at least one node of the RAN 120.