公开(公告)号：US20240357707A1

公开(公告)日：2024-10-24

申请号：US18303513

申请日：2023-04-19

申请人： T-Mobile USA, Inc.

发明人： Hang Hoi Yau ,  Christopher Joul ,  Hyung Keun Choi ,  Lin Zhang ,  Syed Hassan Raza ,  William Hooker ,  Srinivasa Rao Bodapotula ,  Anthony James Wageman

IPC分类号： H04W76/50 ,  H04L65/1016

CPC分类号： H04W76/50 ,  H04L65/1016

摘要： Solutions for placing an emergency call over a wireless network improve speed and reliability by prioritizing using an internet protocol (IP) multimedia subsystem (IMS) packet data network (PDN) or protocol data unit (PDU) network (PDN/PDU) over domain reselection when a call attempt fails over an emergency PDN/PDU (EPDN/EPDU). Examples include establishing an IMS PDN/PDU session for a user equipment (UE) over a wireless network; attempting, by the UE, an emergency call using an EPDN/EPDU over the wireless network; and based on at least a failure of the emergency call over the EPDN/EPDU, reattempting the emergency call using the IMS PDN/PDU over the wireless network. Based on at least a failure of the emergency call over the IMS PDN/PDU, the UE performs domain reselection and reattempts the emergency call using a second wireless network. In some examples, wireless networks transmit a network policy for handling the emergency call to the UE.