Now most mobile phones are 2G, and some are called 2.5G or 2.75G. ..
GSM users of China Mobile or China Unicom mostly use the general 2G terminal +GPRS function. There are many EDGE mobile phones in the market, which can be called 2.75G but the real 3G WCDMA. At present, China Mobile only has a trial network. So generally speaking, there is no 3G mobile phone on the market. The more expensive a mobile phone is, the more powerful it is.
Most CDMA users of China Unicom use CDMA 1x terminals. This is a 2.5G, or quasi-3G terminal. High-speed packet data services up to 153.6kbps can be used. But there is still a certain distance from the real 3G CDMA2000 1x EVDO. At present, China Unicom has several experimental or commercial networks of EVDO. But it has not been officially commercialized. Therefore, the mobile phones purchased in the general market are not 3G mobile phones unless otherwise specified.
TD-SCDMA is a 3G system independently developed by China. Currently being tested, there is no terminal on the market.
The biggest difference between 3G network and current network is that it can provide rich multimedia services based on high-speed packet data. As for ordinary calls, it is basically the same as the current network. Moreover, the biggest principle of network construction is backward compatibility to ensure the use of the basic functions of the original users.
3G mobile phone is a terminal supporting high-speed packet data service in 3G network. At present, the services we can see include videophone, mobile TV, mobile phone on demand, streaming media and other services that require a lot of data traffic. Of course, there are entertainment functions such as online 3G games, downloading music (not ringtones), and business functions such as high-speed mobile Internet access.
What is 3G?
The first generation of mobile phones is analog, the second generation is digital mobile phones such as GSM and TDMA, and the so-called third generation mobile phone is a new generation mobile communication system that can combine voice communication with multimedia communication, and its possible value-added services will include information services such as images, music, web browsing and teleconference.
The third generation mobile phone has many names, which ITU calls "IMT—2000" and European telecom giants call it "UMTS" (Universal Mobile Telecommunication System). The technical standards that the third-generation mobile phone may apply, such as WCDMA and CDMA—2000, are also called the third-generation mobile phone in some occasions, and the more general name is "3G".
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 communicator". 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 have a huge display screen and often come across it!
What can 3G mobile phones do?
What can 3G mobile phones do? According to experts, it 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. There will be many models of 3G mobile phones with their own cameras, which allow users to hold computer meetings with their mobile phones and make digital cameras "redundant".
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 9600 bytes per second, and the data transmission speed that the third generation mobile phone may eventually reach will be as high as 2 bytes 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. Supporting high-quality voice, packet data, multimedia services and multi-user rate communication will greatly expand the connotation of mobile phone communication.
Pay attention to the formulation of 3G standards
1In March, 1999, ITU-RTG8/ 1 Brazil conference determined the general pattern of the third generation wireless interface technology. The third generation wireless interface technology can be divided into two categories: CDMA and TDMA, among which CDMA is dominant. CDMA is divided into three technologies: FDD direct sequence, FDD multicarrier and TDD. TEMA is mainly composed of UWC 136 and DECT technology. After this meeting, different third-generation technologies showed a trend of integration and unification.
Shortly after the TG8/ 1 meeting in Brazil, Ericsson and Qualcomm reached an agreement on mutual licensing of patents. 1in may 1999, more than 30 largest wireless operators and 10 wireless equipment manufacturers in the world reached an agreement on the integration of broadband CDMAFDD technology. The ITU T G8/ 1 Beijing Conference held in June made great achievements in the integration of the third generation mobile communication technology. The Toronto conference protocol of international operators has been widely supported by the delegates, which has opened up a broad road for the integration of CDMAFDD technology. At the same time, with the efforts of Chinese representatives, all parties have attached great importance to CDMATDD technology, and the integration of CDMATDD technology is also accelerating.
The support of many wireless operators and equipment providers for 3G mobile communication technology convergence and the detailed 3G wireless interface specification framework to be determined at the TG8/ 1 Beijing conference to be held in June this year will lay a solid foundation for the final completion of IMT—2000 wireless interface standard in June this year.
The formulation of network technology standard is an important part of the third generation mobile communication standard, and the integration of network technology is related to whether mobile users can roam between different third generation operating systems. System networks conforming to IMT—2000 wireless interface standard can use different protocols, but the networks must follow the standards formulated by ITU. At present, some standards of the third generation mobile communication network are also being actively formulated.
Dawn of the East
China is one of the countries with the fastest development of mobile communication in the world. By the end of 1997, the number of users has reached13.23 million, and it is estimated that the number of mobile users will reach more than 30 million this year. In the development of the first generation (1G) and the second generation (2G) mobile communication systems, due to various factors, we failed to really form our own mobile communication industry. Now, the third generation mobile communication is in the initial stage in the world, and the relevant systems and standards have just begun to be formulated. Through 3G, the scientific research and communication in China will be promoted, and the communication network in China will be gradually localized.
China attaches great importance to the research and development of 3G, and the Ministry of Posts and Telecommunications has set up a 3G mobile communication leading group, which is responsible for the leadership and coordination of 3G mobile communication. In addition, the former Ministry of Posts and Telecommunications and the national "863" have respectively conducted project research on the third generation mobile communication system.
1On June 29th, 1999, China Institute of Telecommunications Science and Technology (Datang Telecom) submitted a TD——SCDMA scheme with independent intellectual property rights in China to ITV. The scheme integrates international leading technologies such as intelligent wireless, synchronous CDMA and software radio, and has high spectrum utilization rate, low cost, great flexibility and great competitiveness.
1998165438+10. In October, TD-SCDMA, the third-generation mobile communication standard proposed by the former Institute of Telecommunications Science and Technology of the Ministry of Posts and Telecommunications (Datang Telecom) on behalf of China, became the only third-generation mobile communication (3G) standard selected by ITU in Asia and one of the important international 3G standards.
The future 3G is not a dream.
Because people can't resist the temptation of 3G products, people have predicted 3G products and technologies. Ovam, an independent research and consulting company, released a report, claiming that the market in most regions was mature in 2006. However, most world-class manufacturers have released prototypes of new devices that they think will be the future wireless communication tools.
Analysts of Strategis Group believe that several markets around the world will adopt wireless networks as early as 2002, while the United States will not be able to use this technology until 2004, because Asia and Europe far surpass the United States in 3G wireless technology.
According to another analyst of Strategis Group, Finland, Japan and Britain will launch 3G technology in the market first. Although these countries may not be big markets for wireless Internet services, they will definitely adopt 3G services due to the increasing demand of users. Strategis Group also revealed that a large number of commercial applications of 2 5G and 3G technologies will still take several years to go public, and wireless operators are currently changing their business models to prepare for these services. This will bring a new situation to wireless communication and information.
As for the number of users in the 25G and 3G market in 2006, according to the estimate of Strategis Group, China will have more than 75 million users, ranking first in the world, followed by Japan with about 36 million users, while the United States is far behind, with its 25G and 3G users below140,000.
3G communication technology is getting closer and closer to our life, and its arrival will surely set off a new wave of wireless communication. 3G is an important development stage of personal communication in the future, with milestone and epoch-making significance.
It is estimated that it will take several years for 3G to be commercialized in China. In these precious years, we will vigorously develop GSM from the strategic height of meeting the increasingly fierce competition in the future mobile communication market, constantly introduce new services, and actively and steadily prepare for the evolution to 3G.