It claimed that the iPhone maker breached agreements with the firm and encouraged regulatory attacks on its business in various jurisdictions around the world by making false statements.
Apple had filed the lawsuit accusing Qualcomm of overcharging for chips and refusing to pay some $1 billion in promised rebates. The lawsuit came days after the US government accused the chipmaker of resorting to anticompetitive tactics to maintain a monopoly over key semiconductors in mobile phones.
In a statement, Qualcomm said that Apple has launched a global attack on Qualcomm and is attempting to use its enormous market power to coerce unfair and unreasonable licence terms from Qualcomm.
Qualcomm filed counterclaims to Apple’s lawsuit with the US District Court for the Southern District of California.
The chipmaker said in the statement that Apple interfered in its agreements with licensees that manufacture iPhones and iPads.
Qualcomm also said Apple threatened it in an attempt to prevent it from making any public comparisons about the superior performance of the Qualcomm-powered iPhones, and misrepresented performance differences between iPhones using Qualcomm modems and those using competitor-supplied modems.
Apple has filed a lawsuit against Qualcomm in Beijing, alleging the chip supplier abused its clout in the chip industry and seeking $145.32 million in damages.