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Huawei Technologies Co Ltd claimed to sue South Korea’s Samsung Electronics Co Ltd over smartphone patents infringement on Wednesday.

The Chinese firm has filed lawsuits in the US and China seeking compensation for the alleged unlicensed usage of 4G cellular communications technology, operating systems and user interface software in Samsung mobile devices.

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In specifics, the alleged infringement covered 12 of its patents—four related to smartphones and eight to cellular networks. The lawsuit includes Samsung’s use of cellular network protocol that the Chinese firm says helps guarantee uninterrupted phone service on 4G LTE networks.

Huawei also asserts that the electronics maker has used this technology on its flagship products, even dating back to the Galaxy S II which was released five years ago.

“Samsung and its affiliates have earned billions of dollars by selling products that use Huawei’s technology.” The Chinese company stated in the lawsuit.

President of Huawei’s Intellectual Property Rights Department, Ding Jianxing, has released in a statement that they are in hopes that the company will respect Huawei’s R&D investment and patents. “We are hoping Samsung will stop infringing our patents and get the necessary license from Huawei and work together with Huawei to jointly drive the industry forward.”

Meanwhile, Samsung told Reuters that it will carefully review the allegations and take appropriate action to defend Samsung’s business interests.

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This is the telecommunications equipment maker’s first intellectual property challenge against the world’s top mobile maker. This lawsuit serves as a sign of role reversal as Chinese firms were often the receiving party of patent infringement issues. Smartphone makers have increased swiftly over the years; however, different intellectual property laws outside China have made overseas expansion sluggish.

Shenzhen-based Huawei last year invested 59.6 billion yuan ($9.2 billion) or 15% annual revenue, in researching and developing technologies, products and wireless communications standards. Generating most of its revenue making telecommunications infrastructure, the Chinese company said it has been granted 50,377 patents globally as of Dec. 31.

Samsung, dubbed as the worlds No.1 memory chip and television maker, stated in a May 16 filing that it had 110,145 patents globally at end-2015. It also invested 14.8 trillion won ($12.45 billion) in research and development and intellectual property in 2015.