The development of mobile communication is rapid. The development, which got started in the US in late 1970s, has come through the first generation of analogic type and the second generation of digital type so far. In the meantime, the second generation of digital cellular system has already been used all around the world, and t...
The mobile communication technology's development is rapid, the mobile communication was starts from the US to develop in the late-1970s, until now has experienced the first genera...
The mobile communication technology's development is rapid, the mobile communication was starts from the US to develop in the late-1970s, until now has experienced the first genera...
