The Sensex is trading up by 200 points to 20,812 when reports last came on emergence of buying by funds and retail investors ahead of the RBI's policy review.The wide-based National Stock Exchange index Nifty moved up by 67 points to 6,206.In the Asian region, Japan's Nikkei rose by 1.54 per cent, while Hong Kong's Hang Seng index gained 0.61 per cent in early trade.