Tokyo stocks ended the morning session slightly higher Tuesday after a three-day losing on bargain-hunting buying, while investors are waiting for the Federal Reserves' upcoming policy decision. The 225-issue Nikkei Stock Average rose 14.79 points, or 0.10 percent, from Monday to 15,020.52. The broader Topix index of all First Section issues on the Tokyo Stock Exchange was up 3.12 points, or 0.25 percent, to 1,232. 35. Gainers were led by machinery, nonferrous metal and insurance sectors, while decliners included mining, air transport and fishery and agriculture issues.