US 12,267,746 B2
CSFB with RIM without network support
Benjamin Abramovsky, Petah Tiqwa (IL); Nimrod Gradus, Givatayim (IL); Ido Shaked, Alfei Menashe (IL); and Jose Salas, London (GB)
Assigned to Parallel Wireless, Inc., Nashua, NH (US)
Filed by Parallel Wireless, Inc., Nashua, NH (US)
Filed on May 2, 2022, as Appl. No. 17/734,181.
Claims priority of provisional application 63/182,081, filed on Apr. 30, 2021.
Prior Publication US 2022/0353751 A1, Nov. 3, 2022
Int. Cl. H04W 36/30 (2009.01); H04W 36/00 (2009.01); H04W 36/14 (2009.01)
CPC H04W 36/305 (2018.08) [H04W 36/00224 (2023.05); H04W 36/1446 (2023.05)] 20 Claims
OG exemplary drawing
 
1. A method for providing Circuit Switch Fall Back (CSFB) with Radio Access Network (RAN) Information Management (RIM) without network support, comprising:
receiving, by a coordinating server, direct information transfer System Information (SI) messages with RIM Packet Data Unit (PDU) from an eNodeB;
sending, by the coordinating server, a RAN-information-request message to a relevant cell, using the routing information in the RIM PDU;
collecting and replaying by the cell the SI needed for CFSB to the coordinating server;
storing, by the coordinating server, the latest SI information per cell; and
replaying, by the coordinating server, the eNodeB with the stored SI information using a MME direct information transfer S1 message.