What is 3g
更新时间：2019-12-10 17:14:00点击次数：6912次
3g, called the 3rd Generation, Chinese meaning is refers to the third Generation of digital communications.
3g, called the 3rd Generation, Chinese meaning is refers to the third Generation of digital communications.
In 1995 the first generation of simulation system, cell phones (1g) only voice calls;
From 1996 to 1997 in the second generation of GSM, TDMA digital formats such as mobiles phones (2g) will increase the function of receiving data, such as receiving E-mail or page;
In 2009 against the backdrop of the third generation (3g) and the former is the main difference between two generations of promotion in the voice and data transmission speed, it can better realize seamless roaming on a global scale, and deal with images, music, video and other media forms, including web browsing, telephones meetings, e-commerce, and other information services, at the same time also want to consider a good compatibility with the second generation system. In order to provide the services, the wireless network must be able to support different data transmission speed, that is to say, in indoor, outdoor, and traffic environment can support at least 2 MBPS respectively (megabit per second), 384 KBPS (thousands of bits) per second and transfer rate of 144 KBPS. (this value changes according to the network environment.
3g standards, the international telecommunication union (ITU) has a determine the world's four big 3g standard, they respectively are WCDMA, CDMA2000 and td-scdma and WiMAX.
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