ALEXANDRIA, Va., June 16 -- United States Patent no. 12,659,881, issued on June 16, was assigned to Apple Inc. (Cupertino, Calif.).

"Time division multiplexing sounding reference signal ports" was invented by Haitong Sun (Cupertino, Calif.), Huaning Niu (San Jose, Calif.), Oghenekome Oteri (San Diego), Dawei Zhang (Saratoga, Calif.), Chunxuan Ye (San Diego), Xiang Chen (Campbell, Calif.), Wei Zeng (San Diego) and Ankit Bhamri (Bad Nauheim, Germany).

According to the abstract* released by the U.S. Patent & Trademark Office: "This disclosure relates to techniques for time division multiplexing sounding reference signal ports in a wireless communication system. A wireless device and a cellular base station may establish a wireless link. The ...