BlackBerry has filed a patent-infringement lawsuit against Nokia, demanding royalties on the Finnish company's mobile network products.

Nokia's products including its Flexi Multiradio base stations, radio network controllers and Liquid Radio software are using technology covered by as many as 11 patents, BlackBerry said in a complaint filed Tuesday in federal court in Wilmington, Delaware.

The mobile network products and services are provided to companies including T-Mobile US Inc. and AT&T Inc. for their LTE networks, BlackBerry said in the complaint. "Nokia has persisted in encouraging the use" of the standard- compliant products without a license from BlackBerry, it said.

"BlackBerry seeks to obtain recompense for Nokia's unauthorized use of BlackBerry's patented technology," the Waterloo, Canada-based company said in the complaint. BlackBerry didn't specify how much it's seeking.

Some of the patents in the case were previously owned by former telecommunications giant Nortel Networks Corp., and Nokia had at one point tried to buy them as part of a failed bid for Nortel's business in 2009, according to BlackBerry.

Since BlackBerry contends that patents cover essential elements of a mobile telecommunications standard known as 3GPP, it has pledged to license them on fair and reasonable terms.