US 10,560,890 B2
Roaming network access method and apparatus
Yinqing Jiang, Wuhan (CN); Li Shen, Beijing (CN); Guanzhong Tan, Shenzhen (CN); Shujun Dang, Beijing (CN); Xiaoyan Chen, Wuhan (CN); Xiaojian Liu, Wuhan (CN); and Hui Jin, Beijing (CN)
Assigned to Huawei Device Co., Ltd., Dongguan (CN)
Appl. No. 15/300,231
Filed by Huawei Device Co., Ltd., Dongguan (CN)
PCT Filed Mar. 28, 2014, PCT No. PCT/CN2014/074274
§ 371(c)(1), (2) Date Sep. 28, 2016,
PCT Pub. No. WO2015/143706, PCT Pub. Date Oct. 1, 2015.
Prior Publication US 2017/0142648 A1, May 18, 2017
Int. Cl. H04W 4/00 (2018.01); H04W 48/18 (2009.01); H04W 48/16 (2009.01); H04W 8/06 (2009.01)
CPC H04W 48/18 (2013.01) [H04W 8/06 (2013.01); H04W 48/16 (2013.01)] 21 Claims
OG exemplary drawing
 
1. A roaming network access method, comprising:
obtaining a mobile country code (MCC) of a roaming area according to a public land mobile network (PLMN) supported by a camped-on emergency service cell;
obtaining a preferential roaming list, wherein the preferential roaming list is used to indicate information about at least one network that a user equipment preferentially attempts to register with when the user equipment is roaming,
wherein: the preferential roaming list includes historical roaming information, information about a radio access technology (RATI supported by the PLMN, and at least one of the following: an operator controlled public land mobile network (OPLMN), and a user controlled public land mobile network (UPLMN);
the historical roaming information is used to record information about one or both of a first roaming network that the user equipment has successfully registered with during roaming and a second roaming network that the user equipment has failed to register with during roaming;
the preferential roaming list is stored in a non-volatile memory of the user equipment, and a backup of the preferential roaming list is stored in a cloud server; and
the backup of the preferential roaming list is stored according to an identifier of each user comprising a cloud account or a phone number of a user, or an International Mobile Equipment Identity (IMEI) sequence number of the user equipment;
selecting a network that matches the MCC from the preferential roaming list and searching for the selected network, wherein selecting the network that matches the MCC from the preferential roaming list comprises selecting PLMNs that match the MCC from the preferential roaming list;
obtaining, according to RATs that are recorded in the preferential roaming list and are supportable by the selected PLMNs, available frequency bands of the RATs from a frequency band list;
each time a network is found by the searching, attempting to register with a network performing information synchronization with the network server to update the backup of the preferential roaming list; and
updating the preferential roaming list with the historical roaming information in real time according to whether the user equipment has successfully registered.