ALEXANDRIA, Va., June 16 -- United States Patent no. 12,309,694, issued on May 20, was assigned to Nokia Solutions and Networks Oy (Espoo, Finland).

"Mapping between cell load and rectifier efficiency" was invented by Seppo Olavi Hamalainen (Espoo, Finland) and Claudine Batsleer (Antwerp, Belgium).

According to the abstract* released by the U.S. Patent & Trademark Office: "Disclosed is a method comprising receiving, from a power supply unit of a base station, measurement information for one or more parameters related to an efficiency of a rectifier of the power supply unit; receiving cell load measurements indicative of a cell load of the base station; determining, based on the measurement information and the cell load measurements, a map...