The issue revolves around Ericsson's alleged infringement of five KPN patents covering various wireless network functions.
In a court filing, KPN said it had offered to issue licences to Ericsson for the infringed patents but the Swedish company did not obtain a licence.
\"We refrain from making any further comments since this is an ongoing legal matter,\" an Ericsson spokeswoman said.
Lawsuits over royalty payments are not uncommon in the technology industry<\/a>. Ericsson in December filed https:\/\/www.reuters.com\/article\/us-ericsson-patents-samsung-idUSKBN28L0MX a lawsuit in the United States against Samsung in a patent dispute.
Ericsson had warned that delayed royalty payments and potential legal costs could reduce its operating income by 1-1.5 billion Swedish crowns ($118 million-$177 million) per quarter beginning in the first quarter of 2021.
KPN has been a telecom equipment customer of Ericsson for more than a decade and last year awarded https:\/\/www.reuters.com\/article\/kpn-5g-ericsson-idUSKBN2700Y1 the company a contract to build core elements of its new 5G mobile network.
The Dutch company said in the lawsuit that it is seeking monetary compensation for the infringed patents.
A KPN spokesman declined to give more detail as the case had been filed with the court.
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