Mobile phone maker Nokia has asked a U.S. court to enforce Qualcomm’s obligations in patent licensing, Nokia said on Wednesday.

“Nokia is asking the court to order Qualcomm to abide by its written contractual obligations in international standards setting organizations to license intellectual property essential to GSM and UMTS technology standards on fair, reasonable and nondiscriminatory terms,” Nokia said in a statement.

Nokia, the world’s largest mobile phone maker, also said it was seeking a court order to affirm that Qualcomm “is not entitled to injunctive relief in relation to alleged infringement of patents declared essential to a standard.”

Nokia and Qualcomm have had a longstanding disagreement over essential patents relating to mobile phone technologies. The two companies are in negotiations about extending technology license agreements.

“Qualcomm has filed three separate legal actions against Nokia in U.S. Federal Court, a court in the United Kingdom and the U.S. International Trade Commission where it has requested injunctions against Nokia,” Nokia said.

Nokia also said it was asking the court in Delaware to enforce Qualcomm’s obligation to negotiate royalties on fair, reasonable and nondiscriminatory terms.

In July, Qualcomm said the U.S. International Trade Commission was investigating whether Nokia engaged in unfair trading practices by importing and selling mobile phones that infringed on Qualcomm’s patents.

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