I would recommend that almost everyone on this thread needs to do a Performance Based Nav course and read the ICAO PBN doc. The terms P-RNAV and B-RNAV and many others used in this thread have no relevance in China where they have adopted and are implementing PBN precisely as prescribed by ICAO.
If you want to fly RNAV1 or RNAV2 procedures you need to ask for them. If you ask for a radio nav based procedure in China that's exactly what you are expected to fly and if the navaid is out then you can't.
Not everywhere is surveyed to WGS84 yet which is why you cannot use an RNAV system to fly non RNAV procedures and when flying RNAV1 then you must only use GPS, DME/DME or DME/DME/IRS position solutions. VOR/DME updating is not allowed.