China's NDRC tells InterDigital that its executives could be arrested or detained if they attend a meeting to address charges of violating Chinese anti-monopoly law.
A complaint filed by InterDigital with the U.S. International Trade Commission wants a ban on wireless devices made by Samsung, Nokia, ZTE, and Huawei Technologies.
The company has extended an existing agreement to cover a crucial element of its next-generation smartphones, due out later this month.
A Huawei executive says the company was in "good faith negotiations" with InterDigital when the complaint over patents was filed.
InterDigital files complaint with the U.S. International Trade Commission, alleging the companies violate patents related to 3G devices.
The search giant has approached the wireless tech company after losing out in the bidding for patents and patent applications from Nortel Networks, The Wall Street Journal reports.
Under the settlement agreement, Samsung will receive an InterDigital license to use its technology in all of Samsung's 3G related products through 2012.
The seven-year agreement covers the current iPhone and looks like it cost Apple about $20 million, plus ongoing royalties.
Samsung is said to be considering bidding on InterDigital's patent portfolio, which is being prepared for auction. The move comes at a time when Samsung is embroiled in extensive IP litigation.
The sale is being pushed back so potential buyers can give it a deeper look, Reuters reports. The news comes on the heels of major deals over intellectual property.