What are the benefits of changing to a 4g card?

If 2G and 3G communication is insignificant for the development of human information, then the future 4G communication will give people real freedom of communication and completely change people's lifestyle and even social form. In 2009, the envisaged 4G communication has the following characteristics:

1: High communication speed.

Because the original purpose of people's research on 4G communication is to improve the wireless access rate of mobile devices such as mobile phones to the Internet, the most impressive feature of 4G communication is the faster wireless communication speed.

Compared with the data transmission rate of mobile communication system, the first generation analog only provides voice service; The transmission rate of the second generation algebraic bit mobile communication system is only 9.6Kbps, and the highest can reach 32Kbps, such as PHS; The data transmission rate of the third generation mobile communication system can reach 2Mbps and even transmit wireless information at the highest speed of 1000Mbps, which is about 1000 times that of the latest mobile phone in 2009 and 50 times that of the third generation mobile phone.

2. Wide network spectrum

In order to make the transmission of 4G communication reach 100Mbps, communication operators must carry out substantial transformation and research on the basis of 3G communication network, so that the communication bandwidth of 4G network is much higher than that of cellular system of 3G network. According to AT & amp； T executives said that each 4G channel is expected to occupy 100MHz spectrum, which is 20 times that of W-CDMA3G network.

3. Flexible communication

Strictly speaking, the function of 4G mobile phone cannot be simply classified as "telephone". After all, the transmission of voice data is only one of the functions of the 4G mobile phone, so the 4G mobile phone should be regarded as a small computer in the future. Moreover, there will be a more amazing breakthrough in the appearance and style of 4G mobile phones. What people can imagine is that glasses, watches, cosmetic boxes and sneakers can be seen under the premise of convenience and individuality.

4. High intelligent performance

The fourth generation of mobile communication is more intelligent, which is not only reflected in the intelligent design and operation of terminal equipment of 4G communication, such as the dependence on menu and scrolling operation will be greatly reduced, but more importantly, 4G mobile phones can realize many unimaginable functions.

For example, a 4G mobile phone can set factors according to the environment, time and so on to remind the owner of the mobile phone what to do and what not to do at this time. The 4G mobile phone can directly download the box office information of the cinema to PDA, which can clearly display the ticket sales and seats, and everyone can buy their own satisfactory movie tickets online according to this information. 4G mobile phone can be regarded as a portable TV, which is used to watch various live broadcasts such as sports competitions.

5: Good compatibility

In order to make 4G communication accepted by people as soon as possible, we should not only consider its powerful functions, but also consider the foundation of existing communication, so that more existing communication users can easily transition to 4G communication with the least investment.

Therefore, from this perspective, the future fourth-generation mobile communication system should have the characteristics of global roaming, open interface, interconnection with various networks, diversified terminals and smooth transition from the second generation.

6. Providing value-added services

4G communication is not evolved from 3G communication through simple upgrade, and their core construction technologies are essentially different. The 3G mobile communication system mainly uses CDMA as the core technology, while the technology of the 4G mobile communication system is orthogonal multi-task frequency division multiplexing (OFDM). With this technology, people can realize wireless communication value-added services such as wireless area loop (WLL) and digital audio broadcasting (DAB). However, considering the transition with 3G communication, the future fourth-generation mobile communication system will not only adopt OFDM technology, but also CDMA technology will play a greater role in collaboration with OFDM technology, and even new convergence technologies such as OFDM/CDMA will appear in the future fourth-generation mobile communication system. The digital audio broadcasting mentioned above actually uses the integrated technology of OFDM/FDMA, which is also the combination of the two technologies.

Therefore, the future fourth-generation mobile communication system with OFDM as the core technology will also combine the advantages of the two technologies, and part of it will be the expansion technology of CDMA.

7. High quality communication

Although the third generation mobile communication system can also realize all kinds of multimedia communication, the future fourth generation mobile communication system is also called "multimedia mobile communication".

The fourth generation mobile communication should not only meet the increasing number of users, but also meet the requirements of multimedia transmission, including the requirements of communication quality. To sum up, first of all, we should be able to accommodate the huge number of users in the market, improve the existing poor communication quality and meet the requirements of high-speed data transmission.

8: High frequency efficiency

Compared with the third generation mobile communication technology, the fourth generation mobile communication technology has adopted and introduced many powerful breakthrough technologies in its development. For example, some optical fiber communication products companies have introduced switching layer technology to further improve the backbone bandwidth of wireless Internet, which can cover different types of communication interfaces at the same time. That is to say, the fourth generation network architecture mainly adopts routing technology.

Due to the use of several different technologies, the use of radio frequency is more effective than the second and third generation systems.

According to the most optimistic estimate, this effectiveness can enable more people to do more things with as much wireless spectrum as before, and the speed of doing these things is quite fast. The researchers said that the download rate may reach 5Mbps to 10Mbps.

9: the cost is cheap

Because 4G communication not only solves the compatibility problem with 3G communication, so that more existing communication users can easily upgrade to 4G communication, but also introduces many cutting-edge communication technologies, which ensure that 4G communication can provide a very flexible system operation mode, so compared with other technologies, 4G communication is much easier and faster to deploy; At the same time, when building a 4G communication network system, communication operators will consider adopting a gradual introduction method directly on the 3G communication network infrastructure, which can effectively reduce the costs of operators and users. According to researchers, some services such as wireless instant connection of 4G communication will be cheaper than 3G communication.