ALEXANDRIA, Va., Oct. 28 -- United States Patent no. 12,457,638, issued on Oct. 28, was assigned to Telefonaktiebolaget LM Ericsson (Publ) (Stockholm).
"Two-step random access" was invented by Jonas Sedin (Sollentuna, Sweden), Zhipeng Lin (Nanjing, China) and Johan Rune (Lidingo, Sweden).
According to the abstract* released by the U.S. Patent & Trademark Office: "A UE is provided with a dedicated preamble for use in a two-step random access procedure, as well as dedicated, contention-free PUSCH transmission resources for the PUSCH part of msgA. In one embodiment, the base station transmits a partial PUSCH msgA configuration to the UE using dedicated RRC signaling. In another embodiment, the base station transmits a resource index to the U...