What standards are the main standards for the 3G mobile phones to be issued in China, and there are

td-scdma

Analysis: The third generation of mobile communication technology.

3rd-generation, 3G) refers to cellular mobile communication technology that supports high-speed data transmission. 3G services can transmit sound and data information at the same time, and the rate is generally more than a few hundred kbps. There are 4 standards for 3G before the spine:

CDMA2000, WCDMA, TD-SCDMA and WiMAX.

TD-SCDMA (Time Division Synchronization Code Division Multiple Access.

As the third-generation sock movement communication standard proposed by China, it has been officially introduced to ITU (International Telecommunication Union) since 1998.

Since its submission, it has taken more than 10 years to complete a series of international standardization work such as the evaluation of the expert group of the standard, the recognition and release of the ITU, the integration with the 3GPP (third generation partnership project) system, and the introduction of new technical features, so that the TD-SCDMA standard has become the first wireless communication proposed by China, based on China's intellectual property rights, and widely accepted and recognized by the world.

International standards. This is an important milestone in the history of China's telecommunications.

The International Telecommunication Union (ITU) has determined that the three mainstream radio interface standards for 3G communication are W-CDMA (Broadband Split Code Multiple Access), CDMA2000 (Multi-Carrier Division Multiplexing Spread Spectrum Modulation) and TDS-CDMA (Time Division Synchronous Code Division Multiple Access Access).

The TD-SCDMA proposed by China has officially become one of the global 3G standards, which indicates that China has entered the world's leading position in the field of mobile communications.

The three major 3G standards confirmed by ITU are: WCDMA (European standard, currently China Unicom's 3G network), CDMA2000 (US standard, currently China Telecom's 3G network) and TD-SCDMA (Chinese standard, currently China Mobile's 3G network).

CDMA2000 proposed by Qualcomm in the United States

WCDMA proposed by Japan in Europe

The first two types of TD-SCDMA proposed by China belong to frequency division duplex, and the latter one is time division duplex, and China has only proposed one.

China Mobile 3G standard, terminal referred to as TD mobile phone, 3G signal is also known as TD signal 、、、 tariff standard: Ordinary call cost TD is cheaper than 2G. TD's monthly fee is 50 yuan per month, and the local basic call fee is called for yuan minutes, and the call is free; Domestic roaming call charges yuan minutes, called yuan minutes; Domestic long-distance call fee 6 seconds; Short message fee for intra-network and out-of-network in-network entries, free of charge for receiving.

TD's new service - visual ** charge is the local communication caller minutes, and the callee is free; Domestic roaming is called Yuan Minute, and Yuan Minute is called; Domestic long-distance yuan 6 seconds. In addition, China Mobile has also launched three TD voice** and data cards**, and the voice tariff is lower than the current G network level.

3G is the abbreviation of the third generation of mobile communications, is a more advanced mobile communication network, the current 3G network under construction in China are: China Mobile's TD-SCDMA, China Telecom's CDMA2000 and China Unicom's WCDMA, 3G network compared with 2G The biggest advantage is ** call and high-speed wireless Internet access.

To put it simply, the technology used is different, the speed of data transmission by 3G technology has increased, and there is another point that 3G supports visual technology, and you can see people when you hit **, which is not available in 2G.