HELSINKI (Reuters) - Nokia Oyj , the world's top mobile phone maker, has filed a complaint with the U.S. International Trade Commission (ITC) against Qualcomm Inc , a note on the ITC's website said on Friday.

Nokia, which makes more than one in three of the cellphones sold globally, asked the ITC to conduct an investigation into technologies used in Qualcomm's chipsets, in a filing made on August 16.

A legal dispute between the two has continued since part of a cross-licensing deal over technology patents expired on April 9, and their increasingly bitter battle is worrying investors and the industry on both sides of the Atlantic.

The legal dispute centers on Nokia's use of Qualcomm patents for high-speed 3G wireless technology, but it also has a bearing on Qualcomm's chips business, which Nokia says uses many Nokia-patented technologies.
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