US 11,792,631 B2
Emergency call method and user terminal
Chao Tang, Shenzhen (CN); Hongkang Wei, Xi'an (CN); Xuanjun Meng, Shenzhen (CN); and Na Shi, Xi'an (CN)
Assigned to HUAWEI TECHNOLOGIES CO., LTD., Guangdong (CN)
Appl. No. 17/427,508
Filed by HUAWEI TECHNOLOGIES CO., LTD., Guangdong (CN)
PCT Filed Jan. 31, 2019, PCT No. PCT/CN2019/074167
§ 371(c)(1), (2) Date Jul. 30, 2021,
PCT Pub. No. WO2020/155013, PCT Pub. Date Aug. 6, 2020.
Prior Publication US 2022/0141636 A1, May 5, 2022
Int. Cl. H04W 4/029 (2018.01); H04W 8/20 (2009.01); H04W 4/90 (2018.01); H04W 84/04 (2009.01)
CPC H04W 4/90 (2018.02) [H04W 4/029 (2018.02); H04W 8/20 (2013.01); H04W 84/042 (2013.01)] 20 Claims
OG exemplary drawing
 
1. An emergency call method, further comprising:
obtaining public land mobile network (PLMN) information from a subscriber identification module (SIM) card of a user terminal, wherein the PLMN information comprises a home PLMN (HPLMN) and an equivalent HPLMN (EHPLMN);
receiving an emergency call operation of a user;
receiving, in response to the emergency call operation of the user, a PLMN list that is broadcast by an access network device, wherein the access network device is in a multi-operator core network (MOCN), and the PLMN list comprises a plurality of PLMNs that share the access network device;
determining an optimal PLMN from the plurality of PLMNs by comparing the PLMN information and the PLMN list; and
making an emergency call through a core network of the optimal PLMN.