公开(公告)号：US20240223620A1

公开(公告)日：2024-07-04

申请号：US18391218

申请日：2023-12-20

Applicant: Apple Inc.

Inventor： Alosious Pradeep Prabhakar ,  Hongjun Wang ,  Vijay Venkataraman

IPC: H04L65/1016 ,  H04L65/1069 ,  H04L65/1073

CPC classification number: H04L65/1016 ,  H04L65/1069 ,  H04L65/1073 ,  H04W84/042

Abstract: Optimizations for simultaneous voice and data experiences in cellular networks include methods of handling voice call fallback, e.g.: (1) on VoNR when an IMS PDU session is established but an Internet PDU session is not yet established; (2) on VoNR when IMS and Internet PDU sessions are established in different network slices; (3) on VoNR when an IMS PDU session is established but a rejection is received for an Internet PDU session; (4) on an LTE network after an EPSFB procedure when an IMS bearer is not present; (5) on an LTE network after an EPSFB procedure when an IMS bearer is present but an Internet bearer is not; (6) on VoNR when a network does not support simultaneous voice and data; (7) when a VoNR-capable UE is camped to SA on a VPLMN; and (8) when a non-VoNR-capable UE is camped to SA on a network that supports VoNR.