A key Indian equity index ended a volatile trading session Friday 0.89 percent higher than its previous close. The 30-scrip sensitive index (Sensex) of the Bombay Stock Exchange (BSE), which opened at 16,693.15 points, closed at 16,844.2 points, 0.89 percent or 148.17 points higher than Thursday's close at 16,696.03 points. The S&P CNX Nifty of the National Stock Exchange (NSE) also ended in the green, up 0.89 percent at 4,996.9 points. Broader market indices ended flat with the BSE midcap index closing 0.01 percent higher and the BSE small cap index 0.18 percent up.