公开(公告)号：WO2021236752A1

公开(公告)日：2021-11-25

申请号：PCT/US2021/033132

申请日：2021-05-19

Applicant: APPLE INC.

Inventor： VENKATARAMAN, Vijay ,  PRABHAKAR, Alosious Pradeep ,  KISS, Krisztian ,  SADIQUE, Mohammed ,  KOSHTA, Nirlesh ,  MATOLIA, Rohit R. ,  MADDURI, Sirisha ,  PRAKASAM, Sridhar ,  NIMMALA, Srinivasan ,  JING, Xiangpeng

IPC: H04W76/50 ,  H04W4/90 ,  H04W8/12 ,  H04W8/18 ,  H04W48/10

Abstract: Emergency services support is indicated to roaming devices in a wireless network. A user equipment (UE) may receive a message from the wireless network indicating at least one public land mobile network (PLMN) that provides emergency services support for devices in limited service. The UE may store, in a non-volatile memory (NVM), an identifier of the at least one PLMN in a whitelist of limited service emergency services support. In response to a trigger in a roaming limited service condition of the UE, the UE may establish an emergency session with a selected PLMN based on the whitelist of limited service emergency services support.