The U.S. Communications Commission (FCC) passed the Enhanced 911 Act in 1996 (revised again in 1999), requiring mobile phone operators to know the geographical location of each mobile phone (the error should be controlled within 50-100m). If any mobile phone calls 911, the government should know its location, even if the user does not know where he or she is. This bill of FCC has greatly promoted the development of mobile location technology and its related services.

　　The arrival of 3G era has opened a new chapter for the development of mobile positioning technology. With the improvement of data transmission capability, the popularity of terminal multimedia capabilities and the emergence of built-in GPS solutions in terminal chips, there are fewer and fewer restrictions on mobile positioning technology. At present, there are four kinds of 3G mobile positioning technologies widely used in the world, namely, the web-based CELL-ID, TOA/TDOA positioning technology, the terminal based OTDOA positioning technology, and the network terminal hybrid A-GPS positioning technology.

　　The rapid development of mobile location technology and the rapid growth of the number of global mobile users also provide unprecedented development opportunities and extremely attractive market prospects for location-based service (LBS).

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