Now "3G communication" is about to become the mantra in people's mouths, so do you know what 3G communication is? The so-called 3G, in fact, is the third generation, which means the third generation digital communication in Chinese. 1995, the first generation of digital mobile phones, can only make voice calls; The second generation digital mobile phones from 1996 to 1997 have added the function of receiving data, such as accepting emails or web pages; The main difference between the third generation and the first two generations is that the speed of transmitting sound and data has increased. It can handle various media forms, such as images, music and video streams, and provide various information services, including web browsing, teleconference and e-commerce. Compared with the first generation analog mobile phones (1G) and the second generation GSM, TDMA and other digital mobile phones (2G),
There are many names for 3G communication. ITU defines it as "IMT-2000" (International Mobile Phone 2000), and European telecom giants call it "UMTS" universal mobile telecommunications system. According to the standard, when the mobile terminal moves at vehicle speed, its data transmission rate is 144kbps, the outdoor stationary or walking speed is 384kbps, and the indoor speed is 2Mbps. However, these requirements do not mean that the available rate of users can reach 2Mbps, because the indoor rate will also depend on the detailed frequency planning in the building and the close cooperation between organizations and operators.
The International Telecommunication Union (ITU) has determined three mainstream wireless interface standards for 3G communication, namely W-CDMA (Wideband Code Division Multiple Access), CDMA2000 (Multicarrier Wavelength Division Multiplexing Spread Spectrum Modulation) and TDS-CDMA (time division-synchronous code division multiple access). Among them, the W-CDMA standard mainly originated from the early third-generation wireless research activities in Europe and Japan. The system is used on the existing GSM network and can be easily converted by system providers. The main supporters of this standard are Europe, Japan and South Korea. At the end of last year, at&; T Mobile Services Branch also announced that it has chosen WCDMA as its third generation service platform. CDMA2000 system is mainly proposed by Qualcomm North America Company, and its construction cost is relatively low. Its main supporters include Japan, South Korea and North America. TD-SCDMA standard was first put forward by China, and cooperated with the international community on the basis of RTT. TD-SCDMA standard is completed and becomes a member of CDMA TDD standard. This is a pioneering work in the field of mobile communication in China, and also China's contribution to the development of the third generation mobile communication. In the competition with the 3G standards proposed by Europe and America respectively, TD-SCDMA proposed by China has officially become one of the global 3G standards, which indicates that China has entered a leading position in the field of mobile communication.
3G mobile phone is the product of the integration of communication industry and computer industry. Compared with the previous mobile phone, the difference is too great, so more and more people begin to call this new mobile communication product "personal communication terminal". Even the most layman in the communication industry can easily judge whether a mobile phone is the "third generation" from the appearance: the third generation mobile phones are all large color display screens, which are often touched. 3G mobile phone can not only complete high-quality daily communication, but also carry out multimedia communication. Users can write and draw directly on the touch screen of 3G mobile phone and send it to another mobile phone, which may take less than one second. Of course, you can also send this information to the computer or download some information from the computer; Users can use 3G mobile phones to surf the Internet directly, check emails or browse the web. There will be many models of 3G mobile phones with their own cameras, which will allow users to hold computer meetings with their mobile phones and even make digital cameras "redundant".
3G communication is a mobile communication service introduced in the mobile communication market after the first generation of analog technology, and it has been introduced into the agenda in the vigorous development of the second generation digital mobile communication market. With the rise of Internet data services and the improvement of fixed access rate (HDSL, ADSL, VDSL), 3G mobile communication system has also seen the dawn of the market, and attracted more and more attention from telecom operators, communication equipment manufacturers and ordinary users.
In 2006, 3G will be officially launched and put into trial operation in China. For relevant information, please refer to www.msn.com Beiqing. com.
Interviewee: keen 12580720- Assistant II 1-5 18:42.
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Haha, I think you care more about this 3G network, so I choose you. .
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Commentator: zyl bobo- trainee magician level 2
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Commentator: ou kule- trainee magician level 2
Why does everyone want to copy ~ should I copy one ~ then I'll buy a 3G mobile phone.
Commentator: 84380669-the first probation
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Now "3G communication" is about to become the mantra in people's mouths, so do you know what 3G communication is? The so-called 3G, in fact, is the third generation, which means the third generation digital communication in Chinese. 1995, the first generation of digital mobile phones, can only make voice calls; The second generation digital mobile phones from 1996 to 1997 have added the function of receiving data, such as accepting emails or web pages; The main difference between the third generation and the first two generations is that the speed of transmitting sound and data has increased. It can handle various media forms, such as images, music and video streams, and provide various information services, including web browsing, teleconference and e-commerce. Compared with the first generation analog mobile phones (1G) and the second generation GSM, TDMA and other digital mobile phones (2G),
There are many names for 3G communication. ITU defines it as "IMT-2000" (International Mobile Phone 2000), and European telecom giants call it "UMTS" universal mobile telecommunications system. According to the standard, when the mobile terminal moves at vehicle speed, its data transmission rate is 144kbps, the outdoor stationary or walking speed is 384kbps, and the indoor speed is 2Mbps. However, these requirements do not mean that the available rate of users can reach 2Mbps, because the indoor rate will also depend on the detailed frequency planning in the building and the close cooperation between organizations and operators.
The International Telecommunication Union (ITU) has determined three mainstream wireless interface standards for 3G communication, namely W-CDMA (Wideband Code Division Multiple Access), CDMA2000 (Multicarrier Wavelength Division Multiplexing Spread Spectrum Modulation) and TDS-CDMA (time division-synchronous code division multiple access). Among them, the W-CDMA standard mainly originated from the early third-generation wireless research activities in Europe and Japan. The system is used on the existing GSM network and can be easily converted by system providers. The main supporters of this standard are Europe, Japan and South Korea. At the end of last year, at&; T Mobile Services Branch also announced that it has chosen WCDMA as its third generation service platform. CDMA2000 system is mainly proposed by Qualcomm North America Company, and its construction cost is relatively low. Its main supporters include Japan, South Korea and North America. TD-SCDMA standard was first put forward by China, and cooperated with the international community on the basis of RTT. TD-SCDMA standard is completed and becomes a member of CDMA TDD standard. This is a pioneering work in the field of mobile communication in China, and also China's contribution to the development of the third generation mobile communication. In the competition with the 3G standards proposed by Europe and America respectively, TD-SCDMA proposed by China has officially become one of the global 3G standards, which indicates that China has entered a leading position in the field of mobile communication.
3G mobile phone is the product of the integration of communication industry and computer industry. Compared with the previous mobile phone, the difference is too great, so more and more people begin to call this new mobile communication product "personal communication terminal". Even the most layman in the communication industry can easily judge whether a mobile phone is the "third generation" from the appearance: the third generation mobile phones are all large color display screens, which are often touched. 3G mobile phone can not only complete high-quality daily communication, but also carry out multimedia communication. Users can write and draw directly on the touch screen of 3G mobile phone and send it to another mobile phone, which may take less than one second. Of course, you can also send this information to the computer or download some information from the computer; Users can use 3G mobile phones to surf the Internet directly, check emails or browse the web. There will be many models of 3G mobile phones with their own cameras, which will allow users to hold computer meetings with their mobile phones and even make digital cameras "redundant".
3G communication is a mobile communication service introduced in the mobile communication market after the first generation of analog technology, and it has been introduced into the agenda in the vigorous development of the second generation digital mobile communication market. With the rise of Internet data services and the improvement of fixed access rate (HDSL, ADSL, VDSL), 3G mobile communication system has also seen the dawn of the market, and attracted more and more attention from telecom operators, communication equipment manufacturers and ordinary users.
The above information comes from the Internet.
Interviewee: red 4 19- Apprentice Magician II 12-23 23:52.
3G is only one level higher than the previous GSM, namely CDMA2000+. The frequency it uses is not the uplink and downlink frequency of 900- 1800. It uses the satellite propagation rate to send and receive information directly from the satellite, rather than through the repeater like GSM. Therefore, as long as there is light and electricity, there is basically a signal.
Respondent: 30545726 1- Assistant II 12-24 00:02
Zhang Jian Xerox
Responder: summer bluex- Trainee Magician II 12-24 10:04.
The so-called 3G mobile phone refers to the third generation mobile phone. With the development of technology and economy, mobile phones are no longer the patent of white-collar workers. And there are many kinds and models of mobile phones. From the first generation of analog mobile phones to the second generation of digital mobile phones such as GSM and TDMA, and now to the third generation of mobile phones, mobile phones have become a new generation of mobile communication systems combining voice communication and multimedia communication, and include value-added services such as images, music, web browsing, conference calls and other information services.
Many people first came into contact with 3G mobile phones from a mobile phone advertisement of Nokia. A happy tourist wandered around a strange city with a 3G mobile phone, and the street map displayed in the mobile phone guided him to his destination smoothly. 3G mobile phones have many names. ITU calls it "IMT-2000" and European telecom giants call it "UMTS" (Universal Mobile Telecommunication System). The possible technical standards of 3G mobile phones are WCDMA, CDMA-2000, TD-SCDMA and so on. 3G mobile phone is the product of the integration of communication industry and computer industry. Compared with the previous mobile phone, the difference is too great, so more and more people begin to call this new mobile communication product "personal communication terminal". Even a layman in the communication industry can easily judge whether a mobile phone is the "third generation" from its appearance: most 3G mobile phones have large color display screens, which are often touch-controlled.
The powerful function is based on the extremely high data transmission speed of 3G mobile phones. At present, the transmission speed of GSM mobile communication network is 9.6K kilobytes per second, and the data transmission speed that the third generation mobile phone may eventually reach will be as high as 2 megabytes per second. What supports this point is that Internet technology is fully integrated into 3G mobile phone system, and the most important one is data encapsulation technology. At present, GPRS developed by using data packaging technology on the existing GSM can reach the transmission speed of 384K kilobytes per second, which is equivalent to twice the transmission speed of D-ISDN. 3G mobile phones support high-quality voice, packet data, multimedia services and multi-user rate communication, which will greatly expand the connotation of mobile phone communication.
Want to know what real 3G life is? Your glasses, watches, cosmetic boxes, sports shoes, anything you can see may become a 3G terminal. With the bandwidth and technology available, this multifunctional terminal enables us not only to communicate anytime and anywhere, but also to download and transmit data, pictures and images in both directions. Of course, we can also play online games with strangers we have never met. According to experts, in the 3G era, mobile phones can not only complete voice communication with high quality, but also carry out multimedia communication. Users can write and draw directly on the touch screen of 3G mobile phone and send it to another mobile phone, which may take less than one second. Of course, you can also send this information to the computer or download some information from the computer; Users can use 3G mobile phones to surf the Internet directly, check emails or browse the web. Many models of 3G mobile phones will have their own cameras, which will enable users to use their mobile phones for computer conferences and even make digital cameras "redundant".
Respondent: alatook 32- probationary period level 1 12-28 15:30.
"3G" is the abbreviation of the third generation in English, which refers to the third generation mobile communication technology. Compared with the first generation of analog mobile phones (1G) and the second generation of GSM, TDMA and other mobile phones (2G), the third generation of mobile phones integrates multimedia information such as wireless communication and Internet. It can handle various media forms, such as images, voice, streaming audio and video, and provide various information services, including web browsing, video teleconference, large-capacity data transmission, mobile broadband connection and so on.
As early as May 2000, the International Telecommunication Union (ITU) formulated three mainstream 3G standards: W-CDMA, CDMA2000 and TDS-CDMA, and completed the International Mobile Communication Plan 2000 (IMT-2000 for short). W-CDMA(DS-CDMA Japan-Europe standard) is the basic network. The system was jointly developed by NTT DoCoMo in Japan, Ericsson and Nokia in Europe. , from the wireless network part to the specification adoption from the base station to the mobile phone terminal.
W-CDMA: wideband CDMA, which means wideband code division multiple access, is mainly used by European manufacturers, including Ericsson, Alcatel, Nokia, Lucent, Nortel and NTT DoCoMo of Japan. This system can be built on the existing GSM network, and it is easier for system manufacturers to be compatible and transitional. In Asia, where GSM system is quite popular, the acceptance of this new technology will be higher. It can be said that W-CDMA has inherent market advantages.
CDMA2000: It was proposed by Qualcomm, Motorola, Lucent and Samsung of South Korea. At present, South Korea has become the leader of this standard. The standard originated from narrowband cdmaOne, which can be directly upgraded from the original cdmaOne structure to 3G CDMA2000 with low construction cost. But at present, there are not many areas using CDMA, and there are not as many users of CDMA2000 as W-CDMA. The research and development technology of CDMA2000 is the fastest among the current standards, and many terminals have been circulating in the market for a long time, so Japanese au telecom users unconsciously changed their 3G mobile phones.
TDS-CDMA: This standard is a 3G standard independently formulated by China, and was proposed by Datang Telecom to ITU 1999 on June 29th. The standard integrates international leading technologies such as intelligent wireless, synchronous code division multiple access and software radio. In addition, due to the huge domestic 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 TDS-CDMA standard.
As early as 200 1 1, the global mobile communication giant NTT DoCoMo opened the world's first 3G network with W-CDMA 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 because it is not considered necessary. But because Japan and South Korea also adopt this network, the global communication networks can be connected in series to realize borderless!