Qualcomm filed lawsuits against China-based smartphone vendor Meizu for infringing its patents at the end of June in Beijing and Shanghai, China. Other players such as Oppo and Vivo also to have a chance to be sued, according to reports from China media.

With its wireless communications patents, Qualcomm used to demand China-based smartphone vendors pay a licensing fee equal to 5% of each smartphone's selling price per unit and provide free reverse patent licensing.

Qualcomm and China's National Development and Reform Commission reached an agreement in February 2015 for Qualcomm to pay a fine for its anti-trust action. Qualcomm is not allowed to demand reverse patent licensing and has recalculated its patent licensing fees based on 65% of a smartphone's selling price.

Most China-based smartphone vendors have already re-signed patent licensing contracts using the new rules, but a few vendors such as Meizu, Vivo and Oppo are not satisfied with the terms and have not yet signed contracts with Qualcomm. As a result, Qualcomm has decided to file suit to resolve the issues.

However, the lawsuit has helped Meizu over its marketing. At a recent press conference, Meizu complained about Qualcomm's actions and claimed that the licensing fees are causing smartphone prices to rise.