ALEXANDRIA, Va., Dec. 2 -- United States Patent no. 12,489,578, issued on Dec. 2, was assigned to Motorola Mobility LLC (Chicago).

"Method and apparatus for performing contention based random access in a carrier frequency" was invented by Hyejung Jung (Palatine, Ill.), Vijay Nangia (Woodridge, Ill.), Ravikiran Nory (Buffalo Grove, Ill.), Ravi Kuchibhotla (Gurnee, Ill.) and Robert T Love (Barrington, Ill.).

According to the abstract* released by the U.S. Patent & Trademark Office: "A method and user equipment are provided, in which an indication that a cell in a carrier frequency supports a 2-step random access procedure is received. A physical random access channel preamble is transmitted on a first time-frequency resource. A physical upl...