ALEXANDRIA, Va., July 21 -- United States Patent no. 12,689,490, issued on July 21, was assigned to Nokia Technologies Oy (Espoo, Finland).

"Null data packet announcement frame transmission method and related apparatus" was invented by Jian Yu (Shenzhen, China), Yuchen Guo (Shenzhen, China), Chenchen Liu (Shenzhen, China), Yunbo Li (Shenzhen, China), Ming Gan (Shenzhen, China) and Dandan Liang (Shenzhen, China).

According to the abstract* released by the U.S. Patent & Trademark Office: "A method includes: An access point generates an NDPA frame, where the NDPA frame includes a station information field, and the station information field includes an AID subfield indicating an association identifier AID of a station; the station information...