公开(公告)号：US12010611B2

公开(公告)日：2024-06-11

申请号：US17200122

申请日：2021-03-12

Applicant: Apple Inc.

Inventor： Sridhar Prakasam ,  Karthik Anantharaman ,  Krisztian Kiss ,  Nirlesh Koshta ,  Nitin Kuppelur ,  Xiangpeng Jing

IPC: H04W48/18 ,  H04W8/02 ,  H04W84/04

CPC classification number: H04W48/18 ,  H04W8/02 ,  H04W84/042

Abstract: User equipment devices (UEs) and methods are described for performing single network slice selection assistance information (S-NSSAI)-aware public land mobile network (PLMN) selection in a roaming scenario. A mapping list is received that includes a mapping of a plurality of public land mobile networks (PLMNs) to corresponding S-NSSAI values. The mapping list is received from a home PLMN (HPLMN) of the UE over non-3rd generation partnership (non-3GPP) access, from a server, or from a Universal Mobile Telecommunications Service (UMTS) subscriber identity module (USIM) of the UE. An available PLMN is determined that is mapped to a preferred S-NSSAI value of the UE based on the mapping list. A connection is established with the available PLMN.

公开(公告)号：US20230049004A1

公开(公告)日：2023-02-16

申请号：US17847124

申请日：2022-06-22

Applicant: Apple Inc.

Inventor： Nitin Kuppelur ,  Anish George ,  Karthik Anantharaman ,  Deepak Dash

IPC: H04W36/00 ,  H04L65/1073 ,  H04L65/1016

Abstract: This disclosure describes a user equipment device (UE). The UE includes one or more antennas; one or more radios configured to perform cellular communication using a plurality of radio access technologies (RATs) that support voice over an Internet protocol (IP) multimedia subsystem (IMS); and one or more processors coupled to the one or more radios. The one or more processors are configured to cause the UE to perform operations including: sending, to a communications network associated with a first RAT of the plurality of RATs, a first request for IMS registration, wherein the UE is camped on a first cell of the first RAT; determining, based on an IMS rejection failure, that the IMS registration failure is due to a temporary radio failure; and responsively attempting to perform the IMS registration on at least one other cell of the first RAT.