Just last month an industry group that included Nokia filed an antitrust lawsuit against Qualcomm. Qualcomm fired back today with a patent infringement lawsuit against Nokia concerning GSM. Qualcomm has asked the court to force Noka from selling or producing GSM products in the US.
QUALCOMM's lawsuit includes patents that are essential for the manufacture or use of equipment that complies with the GSM, GPRS and EDGE cellular standards (the GSM family of standards) and other patents that are infringed by Nokia's products. Patents that are essential to a standard are those that must necessarily be infringed to comply with the requirements of the standard.
Qualcomm has an extensive collection of patents, numbering more than 4,000 in the US alone.