3G mobile phone, that is, the third generation mobile phone, generally refers to a new generation mobile communication system that combines wireless communication with multimedia communication such as the Internet. It can handle images, music, video streams and other media forms, and provide a variety of information services including web browsing, teleconference, e-commerce and so on. In order to provide this service, the wireless network must be able to support different data transmission speeds, that is, in indoor, outdoor and driving environments, it can support at least 2Mbps (megabits per second), 384kbps (kilobytes per second) and 144kbps respectively.
3G technical standard
In May 2000, the International Telecommunication Union (ITU) determined three mainstream wireless interface standards: W-CDMA, CDMA2000 and TDS—CDMA, and wrote them into the 3G technical guidance document "International Mobile Communication Plan 2000" (IMT—2000 for short).
W—CDMA
That is wideband code division multiple access, also known as CDMADirectSpread, which means wideband code division multiple access. Its supporters are mainly European manufacturers with GSM system, and Japanese companies also participate in it to some extent, including Ericsson, Alcatel, Nokia, Lucent and Nortel in Europe and America, as well as NTT, Fujitsu and Sharp in Japan. This system can be built on the existing GSM network, which can be easily transitioned by system providers. In Asia, where GSM system is quite popular, the acceptance of this new technology is expected to be quite high. Therefore, W-CDMA has inherent market advantages.
CDMA2000
CDMA2000, also known as CDMAMulti—Carrier, was proposed by Qualcomm North America Company of the United States, and Motorola, Lucent and Samsung of South Korea all participated in it. At present, South Korea is the leader of this standard. The system originated from the narrow-band CDMAOne digital standard, and can be directly upgraded from the original CDMAOne structure to 3G, with low construction cost. But at present, CDMA is only used in Japan, South Korea and North America, so there are not as many supporters of CDMA2000 as W-CDMA. However, the research and development technology of CDMA2000 is the fastest among the current standards, and many 3G mobile phones have already taken the lead.
TD—SCDMA
This standard is a 3G standard independently formulated by Chinese mainland. On June 29th, 1999, China Institute of Telecommunications Science and Technology (Datang Telecom) proposed to ITU. The standard integrates international leading technologies such as smart wireless, synchronous CDMA and software radio, and has unique advantages in spectrum utilization, business support flexibility, frequency flexibility and cost. In addition, due to the huge market in China, the standard has attracted the attention of major telecom equipment manufacturers, and more than half of the equipment manufacturers in the world have announced that they can support the TD-SCDMA standard.
When will 3G come?
Japanese mobile communication giant NTTDoCoMo has launched the world's first 3G service on June 10, which is based on WCDMA standard.
At present, Asia has become the fastest growing region of 3G, followed by Europe, and the United States is far behind in technical preparation due to lack of enthusiasm. In addition to Japan and South Korea, Thailand and Hong Kong also issued 3G licenses. Taiwan Province Province is about to issue 3G licenses, and the mainland is expected to issue 3G licenses before the end of the year. It is expected that the market will issue two or three cards.