Recently, Transsion filed a patent infringement lawsuit against Ericsson at the Lisbon Regional Division of the Unified Patent Court (UPC), alleging infringement of a patent held by Transsion. This marks the first time Transsion has publicly filed a patent infringement lawsuit as the plaintiff, indicating that it has adopted a more confrontational stance in its global patent dispute with Ericsson.

On March 6, 2026, Transsion filed a complaint with the Lisbon Regional Division of the UPC, alleging that Ericsson infringed its EP4123910 patent, titled “Method for Indicating Information and Related Products.” The complaint has not yet been made public. The Lisbon Regional Division previously rejected Ericsson’s request for a preliminary injunction in the Ericsson v. ASUSTek case on grounds of lack of urgency, but subsequently ruled that the patent in question was valid and had been infringed, ultimately ruling in Ericsson’s favor.

This case marks Transsion’s first public filing of a patent infringement lawsuit against Ericsson as the plaintiff. Previously, since November 2025, Ericsson has launched multiple rounds of global Standard Essential Patent (SEP) enforcement actions against Transsion, involving Brazil, India, Nigeria, multiple divisions of the Unified Patent Court (UPC), Indonesia, Colombia, Morocco, Vietnam, Thailand, the Philippines, and South Africa.

In addition to the litigation with Ericsson, Transsion has entered into patent licensing agreements with multiple rights holders, including Qualcomm, Philips, Huawei, and Nokia, and has reached an agreement on HEVC licensing with Access Advance licensors NEC, JVC, Sun Patent Trust, and the Electronics and Telecommunications Research Institute (ETRI) of South Korea.