Public Warning System (PWS)

http://blog.ijliao.info/archives/2011/03/20/4274/

http://isamsaysaysong.blogspot.com/2011/04/blog-post.html

http://smscellbroadcast.wordpress.com/tag/4g%E6%89%8B%E6%A9%9F%E7%B7%8A%E6%80%A5%E6%95%91%E9%9B%A3%E5%8A%9F%E8%83%BD%E5%86%8D%E9%80%B2%E5%8C%96/

CB : Cell Broadcast