公开(公告)号：US20220353751A1

公开(公告)日：2022-11-03

申请号：US17734181

申请日：2022-05-02

Applicant: Parallel Wireless, Inc.

Inventor： Benjamin Abramovsky ,  Nimrod Gradus ,  Ido Shaked ,  Jose Salas

IPC: H04W36/00 ,  H04W36/30 ,  H04W36/14

Abstract: A method and system for for providing Circuit Switch Fall Back (CSFB) with Radio Access Network (RAN) Information Management (RIM) without network support is presented. In one embodiment, a method includes 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.