OSLO, Nov 4 (Reuters) - Norway"s central bank plans to raise its key policy interest rate next month, it said on Thursday, continuing a campaign of monetary tightening that started in September here. Norges Bank’s monetary policy committee kept the rate on hold at 0.25% for now, as unanimously expected in a Reuters poll of economists. (Reporting by Terje Solsvik and Victoria Klesty, editing by Gwladys Fouche)