Do a Permanent Resident required valid visa to remain in Australia.

I'm on PR of Australia but residing out of Australia due to my job. My visa is going to be expire with in few months, I planed to migrate permanently now.
I'll enter Australia on valid visa but it'll expire after entry.
I want to know whether valid visa is compulsory to remain in Australia or without visa PR holder can live in Australia lawfully?
Kindly answer if anybody know the immigration rules on this matter.

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