Ericsson and Apple have gone to the courts to resolve a two-year dispute over mobile tech patents.
The two companies have been unable to reach an agreement on the licensing of Ericsson's patents relating to device connectivity and power, the Sweden-based vendor said.
An existing global license agreement has expired and Apple has declined to take a new license on offered on fair, reasonable and non-discriminatory (Frand) terms.
Instead, the device manufacturer filed a lawsuit on Monday asking the United States District Court for the Northern District of California to rule on whether it infringes “a small subset” of Ericsson's patents.
In retaliation, Ericsson has filed a complaint in the US District Court for the Eastern District of Texas requesting a ruling on whether it is due global licensing fees.
The vendor suggested the decision hinges on whether its global licensing offer complies with its Frand commitment.
Kasim Alfalahi, Chief Intellectual Property Officer at Ericsson, commented: "Our goal is to reach a mutually beneficial resolution with Apple. They have been a valued partner for years and we hope to continue that partnership.”
Ericsson said its Q4 2014 financial figures, due out later this month, will include payment from Apple under the previous agreement.
In January 2014, Ericsson settled a similar dispute with Samsung by signing a new global deal on patent licenses.
Ericsson said it has signed more than 100 patent-licensing agreements with companies across the industry.
Apple was not available for comment.
From the archives: Q&A with international law firm Pinsent Masons LLP on all things patents.