Two semiconductor manufacturers had filed a complaint against Qualcomm alleging it abused its dominant market status in South Korea, an Associated Press report said.
Quoting Na Yang-ju, a spokesman for the Fair Trade Commission, South Korea's anti-trust regulator, the report said the two companies were Broadcom and Texas Instruments.
"The two US companies filed a complaint against Qualcomm on June 23 with the Fair Trade Commission, arguing Qualcomm used its exclusive rights to CDMA technology to wield unbeatable power in Korea," Na was quoted as saying.
Qualcomm developed CDMA, a rival standard to the dominant cellular standard GSM, or global system for mobile, and controlled most of the key patents.
CDMA is used in the US and South Korea. Every handset in South Korea has a CDMA chip and handset manufacturers have to pay royalty fees to Qualcomm.
Kim Seung-soo, a spokesman for Qualcomm Korea, said he had no details on the complaint and declined further comment.