The BSE benchmark Sensex opened over 114 points higher in opening trade today on the back of increased buying by foreign funds and retail investors ahead of Budget for 2011-12. The 30-share index of the Bombay Stock Exchange rose by another 114 points, or 0.64 per cent, to 17,815 in the first few minutes of trade today.Similarly, the wide-based National Stock Exchange Nifty index moved up by 33 points, or 0.62 per cent, to 5,337.Brokers said continued buying by funds and retail investors on expectations of an investor-friendly Budget influenced the trading sentiment.Meanwhile, Hong Kong's Hang Seng index was up by 0.39 per cent, while Japan's Nikkei index was down 0.22 per cent in early trade today.