本标准规定了当美国和加拿大用户在美国和加拿大漫游时，当美国和加拿大用户在支持基于3GPP PWS的警报的世界其他地方漫游时，以及当来自北美以外的国际漫游者使用支持3GPP PWS的移动设备漫游到北美时，显示紧急警报的要求。本标准支持FCC报告和命令16-127以及FCC命令17-143的要求。

This standard provides the requirements for presentation of emergency alerts when U.S. and Canadian users are roaming throughout the U.S. and Canada, when U.S. and Canadian users roam elsewhere in the world where 3GPP PWS-based alerting is supported, and when international roamers from beyond North America roam into North America with a 3GPP PWS-capable mobile device. This Standard supports the requirements of the FCC Report & Order 16-127 and the FCC Order on Reconsideration 17-143.