Qualcomm filed 17 infringement complaints against Chinese device maker Meizu, having already filed one last week, after failing to negotiate a patent licensing deal without court intervention.

The complaints were filed in the intellectual property courts in Beijing and Shanghai against Meizu for infringing Qualcomm’s patents covering a broad range of features and technologies used in smartphones, including those relating to 3G (WCDMA and CDMA2000) and 4G (LTE) wireless communications standards, Qualcomm said in a statement.

Qualcomm reiterated what it had said when it filed the first complaint: that it has for more than a year negotiated “in good faith” with Meizu to sign a patent license agreement consistent with terms accepted by China’s National Development and Reform Commission (NDRC) in 2015.

More than 100 Chinese companies have already accepted these terms, including the largest Chinese mobile device suppliers, it said, but Meizu “has refused to engage in good faith negotiations… choosing instead to engage only in delay tactics. Meizu did not respond to Qualcomm’s last offer in April 2016.”

Don Rosenberg, executive vice president and general counsel at Qualcomm, said that “Meizu is attempting to obtain an unfair and improper cost advantage over its competitors”

Qualcomm agreed a settlement with NDRC last year, after a long-running (and expensive) spat about its licensing practices and charges. The company has, at several points, said that uncertainty was tainting its business in the country.

But the US technology company has also trumpeted some high-profile wins, including Xiaomi, TCL (Alcatel) and ZTE.