What is the standard phone? Total what?
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Users questions: What is the standard phone? Total what? Better to tell me what are the characteristics of each, thank you
Experts answer: At present, mobile phone standard includes GSM, CDMA, 3G three, since the advent of mobile phones has gone through a first-generation analogue phones (1G), second-generation GSM, Number of TDMA, etc. Word Mobile (2G), 2.5G mobile communication technology CDMA and third generation mobile communication technology 3G. GSM, CDMA and 3G comparison: GSM digital mobile communication system is a major European telecom operators and manufacturers a standardized form designed by the Commission, which is in the cellular system Evolved from. Including GSM900MHz, GSM1800MHz and GSM1900MHz several bands. GSM system has several important features: copy the best personal security, network capacity, number of resource-rich, call clear, strong stability and less susceptible to interference, the information is sensitive, Call dead less mobile power base and so on. CDMA is the acronym for Code Division Multiple Access (CodeDivisionMultipleAccess), which is a branch of the digital technology - developed spread-spectrum communication technology as a new and sophisticated wireless communications technology. It can be filled Sufficient market for mobile communications capacity and quality of high demand, Juyou high spectrum efficiency, voice quality, confidentiality and strong, dropped calls low electromagnetic radiation Xiao, capacity, coverage is broad characteristics, can greatly reduce investment and lower operating cost. 3G is the third generation mobile communication technology, the next generation mobile communication system Known. 3G system is committed to provide users with better voice, text and data services. And comparison of existing technology, 3G technology, the main advantage is to greatly increase the system capacity, improve communication quality and data transfer rates. Also take advantage of seamless roaming between different network technologies, wireless communications can be System and the Internet to connect to the mobile end user can provide more advanced services. Compared with GSM phones CDMA phones, CDMA mobile phone has the following advantages: CDMA mobile phone with an advanced switch technology: soft switching technology (ie switch is interrupted after the first follow good ), Making CDMA phones and fixed telephone calls can be comparable; use CDMA networks, operators of the investment is relatively less, which for the CDMA mobile phone charges in the lower reserve a space; due to frequent use in order to open a communication-based modulation and multiple means of communication, its capacity 10 times higher than analog technology, About 4 times more than GSM networks; CDMA-based broadband technology allows video applications in mobile communication possible, so that phone calls and send text from the only information service to the narrow bandwidth multimedia applications. Detailed enough to bar
Experts answer: At present, mobile phone standard includes GSM, CDMA, 3G three, since the advent of mobile phones has gone through a first-generation analogue phones (1G), second-generation GSM, Number of TDMA, etc. Word Mobile (2G), 2.5G mobile communication technology CDMA and third generation mobile communication technology 3G. GSM, CDMA and 3G comparison: GSM digital mobile communication system is a major European telecom operators and manufacturers a standardized form designed by the Commission, which is in the cellular system Evolved from. Including GSM900MHz, GSM1800MHz and GSM1900MHz several bands. GSM system has several important features: copy the best personal security, network capacity, number of resource-rich, call clear, strong stability and less susceptible to interference, the information is sensitive, Call dead less mobile power base and so on. CDMA is the acronym for Code Division Multiple Access (CodeDivisionMultipleAccess), which is a branch of the digital technology - developed spread-spectrum communication technology as a new and sophisticated wireless communications technology. It can be filled Sufficient market for mobile communications capacity and quality of high demand, Juyou high spectrum efficiency, voice quality, confidentiality and strong, dropped calls low electromagnetic radiation Xiao, capacity, coverage is broad characteristics, can greatly reduce investment and lower operating cost. 3G is the third generation mobile communication technology, the next generation mobile communication system Known. 3G system is committed to provide users with better voice, text and data services. And comparison of existing technology, 3G technology, the main advantage is to greatly increase the system capacity, improve communication quality and data transfer rates. Also take advantage of seamless roaming between different network technologies, wireless communications can be System and the Internet to connect to the mobile end user can provide more advanced services. Compared with GSM phones CDMA phones, CDMA mobile phone has the following advantages: CDMA mobile phone with an advanced switch technology: soft switching technology (ie switch is interrupted after the first follow good ), Making CDMA phones and fixed telephone calls can be comparable; use CDMA networks, operators of the investment is relatively less, which for the CDMA mobile phone charges in the lower reserve a space; due to frequent use in order to open a communication-based modulation and multiple means of communication, its capacity 10 times higher than analog technology, About 4 times more than GSM networks; CDMA-based broadband technology allows video applications in mobile communication possible, so that phone calls and send text from the only information service to the narrow bandwidth multimedia applications. Detailed enough to bar
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