Worui Da 3G training, 3G's Features
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Users questions: 3G
Experts answer:2009, is the first year of 3G in China, started the year for 3G users in China also have great knowledge of curiosity. Therefore, we Zhongguancun 3G mobile phone division online channel specially prepared "3G Basics Forum" series of articles designed in plain language Made popular 3G knowledge, no stranger to such a seemingly allows the words you could not tell what becomes accessible, so that a series of industry terms to bread and milk, like a well-known concept. What is 3G? 3G in the "G" is "Generation (generation, generation)" means, 3 G is the third generation mobile communication systems. Why is it called 3G? As with 3, there must be 1,2; With 3G, there must be 1G, 2G. Compared to 3G, "1G", and "2G" are the first generation of mobile communication system and second-generation mobile communication system. The core advantage of 3G is high speed Data transmission, is 3G and the "1G", and "2G" the biggest difference. Let us briefly recall the "1G", and "2G": the first generation of mobile communication systems (1G) appeared in the mid 70s of last century. It is the principle of analog modulation techniques, mainly to provide voice services. The main package is the standard Including AMPS (North American Cellular System), NMT (Nordic mobile telephone) and TACS (omni-directional communication system.) The disadvantage is that secrecy is bad, if you want to eavesdrop, just need to adjust to the corresponding radio frequency, you can receive the call content. Second-generation mobile communication systems (2G) in The mid-80s of last century. Its principle is that digital modulation techniques, in addition to voice services, it also supports short message, providing a higher network capacity, improved voice quality and confidentiality, and the introduction of a seamless roaming. Apart from common GSM and cdmaOne (IS-95, is the traditional Relative sense and GSM CDMA), there we are part of Zhongguancun news channel online phone frequently reported iDEN (by the United States SprintNextell operations), IS-136 (D-AMPS), PDC (PersonalDigital Cellular, popular only in Japan). 3G's real name was? IMT-2000 "Xiao-Ming," whose real name is "Li", "3G" whose real name is "IMT-2000", the third generation mobile communication (3G) is the ITU (ITU) in 1985 proposed that frequency planning in the 2 GHz, was named FPLMTS (Future Public Land Mobile Telecommunications System). In 1996, ITU recommendations based on a number of countries, will FPLMTS renamed IMT-2000. Meanwhile, 3G is the standard setting bodies ITU (International TelecommunicationUnion, International Telecommunication Union). But the IMT-2000 is "International Mobile Telecommunications -2000" also contains more content, it is divided into two major categories of CDMA and TDMA technologies were five, of which the first three are the most important technology . 1) IMT-DS (Direct Spread Spectrum CDMA), or WCDMA. It is 5M in a wide frequency band spread spectrum signal directly; 2) IMT-MC (multi-carrier CDMA), or CDMA2000. This is America's technology, by a number of narrow-band direct 1.25M Access spread spectrum system consisting of a broadband system; 3) IMT-TC (Time Division Duplex CDMA): now includes TD-SCDMA and UTRATDD, which TD0SCDMA China's technology. However, the October 19, 2007, ITU approved the move WiMA X as the first six IMT-2000 standard, also the first four major criteria, known as "IMT-2000OFDMATDDWMAN". Who will regulate 3G? 3GPP and 3GPP2 each country has its own laws, so as to guarantee the normal and orderly operation. The 3G standard Also have their own management standards and standard-setting organization for the WCDMA and TD-SCDMA Forum is the 3GPP standardization of the Third Generation Partnership Project (3rdGenerationPartnershipProject), established in December 1998 standardization Institutions. Its members now include Europe, ETSI, ARIB in Japan and the TTC, China, CCSA, TTA in Korea and North America ATIS. At the same time, CDMA2000 specification forum 3GPP2 (Third Generation Partnership Project 2), the organization was in 1999 January was established by the U.S. TIA, Japan, ARIB, Japan TTC, TTA in Korea initiated four standardized, mainly developed by ANSI-41 core network is based, CDMA2000 third-generation wireless interface specification.
Experts answer:2009, is the first year of 3G in China, started the year for 3G users in China also have great knowledge of curiosity. Therefore, we Zhongguancun 3G mobile phone division online channel specially prepared "3G Basics Forum" series of articles designed in plain language Made popular 3G knowledge, no stranger to such a seemingly allows the words you could not tell what becomes accessible, so that a series of industry terms to bread and milk, like a well-known concept. What is 3G? 3G in the "G" is "Generation (generation, generation)" means, 3 G is the third generation mobile communication systems. Why is it called 3G? As with 3, there must be 1,2; With 3G, there must be 1G, 2G. Compared to 3G, "1G", and "2G" are the first generation of mobile communication system and second-generation mobile communication system. The core advantage of 3G is high speed Data transmission, is 3G and the "1G", and "2G" the biggest difference. Let us briefly recall the "1G", and "2G": the first generation of mobile communication systems (1G) appeared in the mid 70s of last century. It is the principle of analog modulation techniques, mainly to provide voice services. The main package is the standard Including AMPS (North American Cellular System), NMT (Nordic mobile telephone) and TACS (omni-directional communication system.) The disadvantage is that secrecy is bad, if you want to eavesdrop, just need to adjust to the corresponding radio frequency, you can receive the call content. Second-generation mobile communication systems (2G) in The mid-80s of last century. Its principle is that digital modulation techniques, in addition to voice services, it also supports short message, providing a higher network capacity, improved voice quality and confidentiality, and the introduction of a seamless roaming. Apart from common GSM and cdmaOne (IS-95, is the traditional Relative sense and GSM CDMA), there we are part of Zhongguancun news channel online phone frequently reported iDEN (by the United States SprintNextell operations), IS-136 (D-AMPS), PDC (PersonalDigital Cellular, popular only in Japan). 3G's real name was? IMT-2000 "Xiao-Ming," whose real name is "Li", "3G" whose real name is "IMT-2000", the third generation mobile communication (3G) is the ITU (ITU) in 1985 proposed that frequency planning in the 2 GHz, was named FPLMTS (Future Public Land Mobile Telecommunications System). In 1996, ITU recommendations based on a number of countries, will FPLMTS renamed IMT-2000. Meanwhile, 3G is the standard setting bodies ITU (International TelecommunicationUnion, International Telecommunication Union). But the IMT-2000 is "International Mobile Telecommunications -2000" also contains more content, it is divided into two major categories of CDMA and TDMA technologies were five, of which the first three are the most important technology . 1) IMT-DS (Direct Spread Spectrum CDMA), or WCDMA. It is 5M in a wide frequency band spread spectrum signal directly; 2) IMT-MC (multi-carrier CDMA), or CDMA2000. This is America's technology, by a number of narrow-band direct 1.25M Access spread spectrum system consisting of a broadband system; 3) IMT-TC (Time Division Duplex CDMA): now includes TD-SCDMA and UTRATDD, which TD0SCDMA China's technology. However, the October 19, 2007, ITU approved the move WiMA X as the first six IMT-2000 standard, also the first four major criteria, known as "IMT-2000OFDMATDDWMAN". Who will regulate 3G? 3GPP and 3GPP2 each country has its own laws, so as to guarantee the normal and orderly operation. The 3G standard Also have their own management standards and standard-setting organization for the WCDMA and TD-SCDMA Forum is the 3GPP standardization of the Third Generation Partnership Project (3rdGenerationPartnershipProject), established in December 1998 standardization Institutions. Its members now include Europe, ETSI, ARIB in Japan and the TTC, China, CCSA, TTA in Korea and North America ATIS. At the same time, CDMA2000 specification forum 3GPP2 (Third Generation Partnership Project 2), the organization was in 1999 January was established by the U.S. TIA, Japan, ARIB, Japan TTC, TTA in Korea initiated four standardized, mainly developed by ANSI-41 core network is based, CDMA2000 third-generation wireless interface specification.
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