2g 20-40Kbps
The minimum transmission speed of 3G is 384Kbps and the maximum bandwidth is 2M.
The third generation, which means the third generation digital communication in Chinese.
His call quality is higher, radiation is less, and he can send and receive emails online quickly. Photo management is based on cdma, so you only need to know this.
2G is the second generation.
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; From 1996 to 1997, the second generation of digital mobile phones appeared, adding the function of receiving data, such as receiving mail 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 of analog mobile phones (1G) and the second generation of GSM, TDMA and other digital mobile phones (2G), 3G communication has many names, which are defined by ITU as "IMT-2000" (International Mobile Phone 2000) and called "UMTS" by European telecom giants.
According to the standard, when the mobile terminal moves at the vehicle speed, its transmission data rate is 144kbps, when it is stationary or walking outdoors, the rate is 384kbps, and it is 2Mbps indoors. 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.
At present, the 2.5G mobile communication technology that has been put into commercial use is a fusion technology from 2G to 3G. Because 3G is a huge project, involving many complicated layers, it is impossible to connect from the current 2G to 3G at once, so there is a 2.5G between 2G and 3G. HSCSD, GPRS, WAP, EDGE, Bluetoot, EPOC and other technologies are all 2.5G technologies.
3g Directory [Hidden]
[4] What is 3G? What is a 3G mobile phone?
3G mobile
3G background introduction
China's 3 g
There is a serious shortage of 3G talents, with an average annual salary of more than 200,000. The market gap of mobile value-added talents is 500,000.
3G standard (1) W-CDMA
(2)CDMA2000
(3)TD-SCDMA
3G parameter WCDMA
TD-SCDMA
CDMA2000
Global interoperability microwave access
Convenient life in 3G era
3G China Authorized
3G- A Developing City
3G tariff China Telecom 3G tariff
China Mobile 3G tariff
[4] What is 3G? What is a 3G mobile phone?
3G mobile
3G background introduction
China's 3 g
There is a serious shortage of 3G talents, with an average annual salary of more than 200,000. The market gap of mobile value-added talents is 500,000.
3G standard (1) W-CDMA
(2)CDMA2000
(3)TD-SCDMA
3G parameter WCDMA
TD-SCDMA
CDMA2000
Global interoperability microwave access
Convenient life in 3G era
China 3G Licensing-Formulating Urban 3G Tariffs
China Telecom 3G Tariff China Mobile 3G Tariff
[Edit this paragraph] [4] What is 3G? What is a 3G mobile phone?
What is 3G 3G? The third generation mobile communication technology (English: 3rd-generation) refers to the cellular mobile communication technology that supports high-speed data transmission. 3G service can transmit voice (call) and data information (e-mail, instant message, etc.) simultaneously. ). The typical feature is to provide high-speed data services.
3G[4] is the abbreviation of the third generation, which refers to the third generation mobile communication technology. Compared with the first generation of analog mobile phones (1G) and the second generation of digital mobile phones (2G) such as GSM and CDMA, the third generation of mobile phones (3G) generally refers to a new generation of mobile communication system combining wireless communication [5] with multimedia communication such as the Internet.
The main difference between 3G[6] and 2G is the improvement of voice and data transmission speed. It can better realize global wireless roaming, handle various media forms such as images, music and video streams, and provide various information services including web browsing, teleconference and e-commerce. At the same time, we should also consider the good compatibility with the existing second-generation system. In order to provide this service, the wireless network must be able to support different data transmission speeds, that is, at least 2Mbps (megabits per second), 384kbps (kilobits per second) and 144kbps in indoor, outdoor and driving environments, respectively (this value will change according to the network environment). 3G is the third generation communication network. At present, domestic networks other than GSM and CDMA are not supported. GSM equipment uses frequency division multiple access, while CDMA uses code division spread spectrum technology. Advanced power and voice activation can provide at least three times the capacity of GSM network. The industry regards CDMA technology as the mainstream technology of 3G, and ITU has determined three wireless interface standards: CDMA2000, WCDMA and TD-SCDMA, which means that domestic CDMA can smoothly transition to 3G network, and the main features of 3G are that,
The first generation analog mobile phone (1995) can only make voice calls;
From 1996 to 1997, the second-generation GSM, CDMA and other digital mobile phones (2G) have added the function of receiving data, such as receiving emails or web pages;
In fact, 3G was not born in 2009. As early as 2007, 3G was produced abroad, and China also successfully developed China 3G in 2008. The theoretical peak downlink speed can reach 3.6Mbit/s (2.8Mbit/s), and the peak uplink speed can also reach 384 KBit/s, which can't be 2G per second as said on the Internet. Of course, the next movie can't be completed instantly.
[Edit this paragraph ]3G mobile phone
3G mobile phone is a terminal device based on dual-network interworking technology. 3G mobile phone is the product of the integration of communication industry and computer industry, which is very different from previous mobile phones. Therefore, 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 its appearance: the third generation mobile phones have a large color display screen, which is often touch-sensitive. 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 the digital camera [1] redundant.
3G communication is a mobile communication service introduced in the mobile communication market that experienced the first generation of analog technology, and it is introduced into the agenda in the booming 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.
[Edit this paragraph ]3G background introduction
On June 2, 2008, China Telecom, China Unicom and China Netcom H-shares all announced the details of telecom restructuring. At this time, it was just six and a half trading days before the suspension of the above operators due to telecom restructuring on May 23rd. With the determination of telecom restructuring plan: China Mobile Tietong = China Mobile, China Unicom (CDMA network), China Telecom = China Telecom, China Unicom (GSM network) and China Netcom = China Unicom, Chinese telecom operators have formed a tripartite confrontation. In this telecom reorganization, China Tietong merged into China Mobile Group and became a wholly-owned subsidiary of China Mobile. Therefore, before, both fixed-line users and broadband users of China Tietong were transformed into users of China Mobile. With the completion of the "Liuhe III" reform and reorganization, three 3G licenses will also be issued. Some experts estimate that according to the schedule, China will issue 3G licenses in the fourth quarter of this year, and China will enter the third generation mobile communication era as soon as the third quarter of next year. Three 3G cards to be issued basically adopt three different standards. TD-SCDMA (time division-synchronous code division multiple access) is a 3G standard independently developed by China, which has been accepted by the International Telecommunication Union. It is also called the three mainstream 3G standards in the world together with WCDMA (Wideband Code Division Multiple Access) and CDMA2000.
According to the telecom restructuring plan, 3G licenses are issued in the following ways: New China Mobile obtains TD-SCDMA license, New China Telecom obtains CDMA2000 license, and China Unicom obtains WCDMA license.
[Edit this paragraph ]3G China
3G China Logo 3G China is the registered trademark of the largest professional 3G mobile phone network business service platform in China. 3G China includes industries, enterprises, products, services and trade functions. It is a comprehensive system service platform for enterprises to realize wap website construction, industry new media communication, mobile business operation and wireless timely communication on 3G network. Its promotion concept of industrial integration and brand-new 3G network wireless communication marketing model constitute a brand-new 3G wireless information network. All its functions and value-added services provide users with a perfect and efficient 3G experience, which perfectly embodies the powerful business connotation of the 3G era.
Today, China has become the largest consumer of mobile communication in the world. In 2008, the number of mobile communication users in China exceeded 600 million. A series of new developments of mobile Internet, such as mobile news, mobile blog and mobile email, have been popularized. But these are only applied to individuals, and the application demand of mobile commerce is more and more urgent. It is the biggest demand of enterprises today to realize the information interaction between enterprises and users through mobile internet, and then to carry out in-depth and all-round applications. With the establishment of the Ministry of Industry and Information Technology,
[Edit this paragraph] There is a serious shortage of 3G talents, with an average annual salary of more than 200,000.
The market gap of mobile value-added talents is 500 thousand
The birth of 3G, a technical standard, greatly improved the data carrying capacity of mobile communication network, and also provided a more solid technical platform for the combination of mobile communication network and Internet. Under the 3G network, almost all services that can be realized on the Internet platform can run on the 3G network. In the 3G era, mobile value-added services are diversified. In addition to the original 2.5G services (such as SMS, MMS, ringtone download, games, WAP and IVR), various new value-added services (video on demand, high-speed Internet access, online games and industrial 3G applications, etc.). ) will be launched one after another, greatly enriching people's lives.
According to some analysts, the market size of 3G mobile value-added services in China will reach 10 trillion, and it will maintain a growth rate of 50% or even higher in the future. Therefore, the mobile value-added market will urgently need a large number of mobile value-added software engineers. However, such talents are very rare in the current market. It is conservatively estimated that with the acceleration of large-scale construction and application of 3G projects, the market gap of mobile value-added software engineers will reach more than 500,000.
Human resources experts say that embedded software development is one of the hottest and most popular occupations in the next few years. According to the statistics of authoritative departments, at present, the talent gap of embedded software in China is about 200,000 people every year. In the future, with the continuous acceleration of "triple play" and the full deployment of 3G networks, this number will increase exponentially. It is hard to imagine what kind of crisis the embedded software industry will face in the future if this problem is not solved.
According to the salary report released by 55 1.com, the annual salary of a senior embedded software engineer with 10 working experience is about 300,000 yuan. Even the average monthly salary of junior embedded software developers is about 5,000 yuan, and the average monthly salary of senior embedded software engineers has exceeded 10,000 yuan. Beijing TV "Capital Economic Report" -3G talent demand is hot with fire software training [3]
[Edit this paragraph ]3G standard
3G standards: WCDMA (European version), CDMA2000 (American version) and TD-SCDMA (China version).
In May 2000, the International Telecommunication Union (ITU) determined four mainstream wireless interface standards, namely WCDMA, CDMA2000, TD-SCDMA and WiMAX, and wrote them into the 3G technical guidance document International Mobile Communication Plan 2000 (IMT—2000 for short). CDMA is the abbreviation of code division multiple access, which is the technical basis of the third generation mobile communication system. The first generation mobile communication system adopts frequency division multiple access (FDMA) analog modulation mode. The main disadvantages of this system are low spectrum utilization and signal interference to voice services. The second generation mobile communication system mainly adopts time division multiple access (TDMA) digital modulation mode, which improves the system capacity, and uses independent channels to transmit signaling, which greatly improves the system performance. However, the system capacity of TDMA is still limited and the handover performance is still not perfect. CDMA system shows great development potential with its advantages of simple frequency planning, large system capacity, high frequency reuse coefficient, strong anti-multipath ability, good communication quality, soft capacity and soft handover. Here are some 3G standards:
( 1) W-CDMA
Also called WCDMA, wideband CDMA, and CDMA direct spread spectrum, which means wideband code division multiple access. This is a 3G technical specification based on GSM network development, and it is a broadband CDMA technology proposed by Europe. It is basically the same as the broadband CDMA technology proposed by Japan and is being further integrated. The supporters of W-CDMA are mainly European manufacturers with GSM system, and Japanese companies are more or less involved, including Ericsson, Alcatel, Nokia, Lucent and Nortel in Europe and America, as well as NTT, Fujitsu and Sharp in Japan. This standard puts forward the evolution strategy of GSM(2G)-GPRS-EDGE-WCDMA(3G). The system can be built on the existing GSM network and can be easily transitioned for system providers. It is expected that in Asia where GSM system is quite popular, the acceptance of this new technology will be quite high. Therefore, W-CDMA has inherent market advantages.
(2)CDMA2000
CDMA2000 is a wideband CDMA technology developed from narrowband CDMA(CDMA IS95) technology, also known as CDMA multicarrier. It was put forward by Qualcomm North America Company of the United States, and Motorola, Lucent and Samsung of South Korea participated. At present, South Korea is the leader of this standard. The system originated from the narrow-band CDMAOne digital standard, and can be directly upgraded from the original CDMAOne structure to 3G, with low construction cost. But at present, CDMA is only used in Japan, South Korea and North America, so there are not as many supporters of CDMA2000 as W-CDMA. However, the research and development technology of CDMA2000 is the fastest among the current standards, and many 3G mobile phones have already taken the lead. This standard puts forward the evolution strategy from CDMA IS95 (2G)-CDMA 20001X-CDMA 20003x (3G). CDMA2000 1x is called the 2nd and 5th generation mobile communication technology. The main difference between CDMA20003x and CDMA2000 1x lies in the application of multicarrier technology, which improves the bandwidth by using three carriers. At present, China Telecom is adopting this scheme to transition to 3G, and has built a CDMA IS95 network.
(3)TD-SCDMA
The full name is time division-synchronous code division multiple access, which is a 3G standard independently formulated by Chinese mainland. 1On June 29th, 999, the former Institute of Telecommunications Science and Technology of China Ministry of Posts and Telecommunications (Datang Telecom) proposed to ITU, but the technological invention originated from Siemens, and TD-SCDMA is known as green 3G because of its low radiation. The standard integrates international leading technologies such as smart wireless, synchronous CDMA and software radio, and has unique advantages in spectrum utilization, business support flexibility, frequency flexibility and cost. In addition, due to the huge 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 TD-SCDMA standard. This standard proposes a direct transition to 3G without the intermediate link of 2.5 generation, which is very suitable for upgrading GSM system to 3G. Military communication network is also the core task of TD-SCDMA.
[Edit this paragraph ]3G parameters
Wideband code division multiple access (WCDMA)
RTT Front for the Defence of Democracy
Asynchronous CDMA system: no GPS
Bandwidth: 5MHz
Chip speed: 3.84 megacps
China band: 1940MHz- 1955MHz (upstream), 2 130MHz -2 145MHz (downstream).
TD-SCDMA
RTT TDD
Synchronous CDMA system: with GPS
Bandwidth: 1.6 MHz
Chip speed: 1.28 MHz/sec
China frequency band: 1880- 1920MHz, 20 10-2025MHz.
2300-2400 MHz
CDMA2000
RTT Front for the Defence of Democracy
Synchronous CDMA system: with GPS
Bandwidth:1.23mhz.
Chip speed: 1.2288 megacycles/second
China frequency band: 1920MHz-1935MHz (upstream), 2110mhz-2125mhz (downstream).
Global interoperability microwave access
Global microwave interconnection access, otherwise known as 802+08.
Bandwidth: 1.5M to 20MHz
Maximum access speed: 70M
Maximum transmission distance: 50km.
Chip speed: unknown
China Band: (temporarily unavailable)
[Edit this paragraph] Convenient life in the 3G era
3G will bring new enjoyment to life.
●3G is a video conference in a taxi;
●3G is a soap opera that can't be missed by train;
●3G is an image sent back from the scene to the headquarters for analysis;
●3G is to enjoy your wonderful holiday in Morocco with friends.
China's 3G road has just begun. The first popular 3G application is "wireless broadband Internet access", with 600 million mobile phone users accessing the Internet anytime and anywhere. The streaming media service of wireless Internet will gradually occupy the dominant position. The core applications of 3G include:
1. Broadband Internet access
Broadband Internet access is a very important function of 3G mobile phones. At that time, we could send and receive voice mails, write blogs, chat, search, download ringtones, etc ... Now many people think that the application of these functions on mobile phones will wait until the 3G era, but in fact, the wireless Internet access is already available. Although the current GPRS network speed is not ideal, it is no longer a dream that mobile phones will become small computers when the 3G era comes.
2. Video call
In the 3G era, the traditional voice call is already a very weak function. By then, new services such as video calling and voice mail will become the mainstream, and the traditional voice calling charges will be reduced, but the visual impact will be strong, and fast and direct video calling will become more popular and develop rapidly.
In the 3G era, what people talk about most is the video calling function of mobile phones, which is also one of the most popular 3G services abroad. I believe many people have used the video chat function of QQ, MSN or Skype to chat face to face with distant relatives and friends. In the future, relying on the high-speed data transmission of 3G network, 3G mobile phone users can also "face to face". When you make a video call with a 3G mobile phone, don't put the phone to your ear, but face the phone and wear a wired headset or a Bluetooth headset. You will see each other's images on the screen of your mobile phone, and you will be recorded and sent to each other.
3. Mobile TV
From the operator level, the issuance of 3G licenses has solved a great technical obstacle, and the construction of standards such as TD and CMMB has also promoted the development of the whole industry. Mobile streaming media software will become the most used mobile TV software in 3G era, which will improve the smoothness and quality of video images, break through the technical bottleneck and be truly applied on a large scale.
4. Wireless search
For users, this is a very practical mobile network service and can be accepted quickly. Searching by mobile phone anytime and anywhere will become a common habit of more mobile phone users.
Step 5 move music
In Japan, where wireless Internet is mature, mobile phone music is the most beautiful scenery, and downloading music through mobile phone is 50 times that of computer. In the 3G era, as long as a mobile phone music software is installed on the mobile phone, the mobile phone can be turned into a music box anytime and anywhere through the mobile phone network, and countless songs can be easily stored, with faster download speed and negligible traffic consumption.
6. Mobile shopping
Many people have the experience of shopping on Taobao, but the mobile phone mall is still a new thing for many people. In fact, mobile e-commerce is the favorite of mobile Internet users in the 3G era. At present, 90% mobile phone users in Japan and South Korea are used to spending money on their mobile phones, even buying daily necessities such as rice and washing powder. Experts predict that there will be a rapid growth period of mobile shopping in China in the future. As long as users open the mobile Internet service, they can query commodity information through their mobile phones and pay for goods online. High-speed 3G can make mobile shopping more real, and high-quality pictures and video conversations can bring businesses and consumers closer, improve the shopping experience and make mobile shopping a new trend.
7. Mobile online games
Compared with computer online games, the experience of mobile online games is not good, but it is easy to carry and can be played at any time. This kind of online game that uses spare time is the new favorite of young people at present, and it is also an important capital growth point in the 3G era. After the arrival of the 3G era, the game platform will be more stable, faster and more compatible, that is, "more fun", just like the upgraded version, which will make users feel more experienced in the visual and effect of the game.
Only one week after the the State Council executive meeting agreed to launch 3G licenses, the Ministry of Industry and Information Technology quickly issued 3G licenses to the three major operators. The Ministry of Industry and Information Technology announced that it approved China Mobile Communications Corporation to increase 3G business licenses based on TD-SCDMA technology, China Telecom Corporation to increase 3G business licenses based on CDMA2000 technology, and China United Network Communications Corporation to increase 3G business licenses based on WCDMA technology.
For operators, the issuance of 3G licenses means the beginning of a new round of market competition. For equipment manufacturers, this means that at least 280 billion yuan of investment cake is in front of them in three years; For users, 3G means that the bandwidth of mobile Internet access is soaring and the tariff is getting lower and lower.
[Edit this paragraph ]3G China authorization
On 20091October 7 14:30, the Ministry of Industry and Information Technology issued three 3G licenses to China Mobile, China Telecom and China Unicom, which marked the official entry of China into the 3G era.
Among them, the following were approved:
China Mobile has increased 3G licenses based on TD-SCDMA technology (TD-SCDMA is the 3G technical standard of China's independent property rights);
China Telecom added 3G license based on CDMA2000 technology;
China Unicom has added a 3G license based on WCDMA technology.
[Edit this paragraph ]3G- Developing City
There are more than 2,000 stations in Beijing, and they are currently making up stations to improve coverage;
There are more than 2,000 stations in Shanghai, covering an area of about 1 153 square kilometers, which will increase to 3,000 TD base stations this year;
Guangzhou has 2 1 16 stations, covering an area of about 1782 square kilometers, which is built by Datang. At present, there are more than15,000 TD trial users in Guangdong, and it is planned to expand to120,000 by the end of the year;
453 sites in Tianjin;
Shenzhen 1000 site;
Xiamen has more than 150 sites;
Shenyang Ding Qiao and Zhongxing Construction;
Qinhuangdao has 300 base stations with a total capacity of about 450,000.
Baoding China Mobile has received China Telecom. * * * There are 453 base stations in Hong Fengwo, 97 indoor distribution stations and 0 repeaters/kloc-0, which are opened in 22 counties and cities in Baoding.
Qingdao China Mobile has received 4 13 TD base stations from Netcom.
[Edit this paragraph ]3G tariff