Read Doc 9613.
Does it mean an RNP route can also be called a PBN route as PBN is used in a broad term.
Here in PBN stars and SIDS it is required that aircraft is (GNSS or DME/DME/IRU) equiped for RNAV1. Now if DME at station is unserviceable does the controller assumes that all aircraft within jurisdiction are no more RNAV1 complient or the controller should check with pilot.