5G network is expected to be commercially available in Asia at the earliest, and people's dependence on WiFi will be reduced.

It is not empty talk to make 5G networks available in 2020. In the United States, operators AT&T and Verizon have begun small-scale 5G network experiments, and it is estimated that this experimental result will be applied in 2020.

In recent years, the voice about 5G networks has become more and more popular. So, why is the 5G network favored? What changes will it bring to the parties? How can the obstacles encountered in the 5G network from theory to practice be solved?

Technological advancement has made people's requirements for network speed increase

In fact, people are so keen on 5G networks, not just because it is a new technology, but there are more deeper reasons behind it.

First, with the popularity of mobile terminals, mobile devices have become the device of choice for people to access the Internet.

In life, unless we have necessary scenes such as office, we are already used to mobile Internet. Therefore, people's requirements for traffic and network speed also increase. Although there are many public WIFIs now, their speed and security have been repeatedly criticized. Therefore, improving the speed of the mobile network is the best way to meet the needs of the masses.

Second, the development of VR puts forward requirements for network speed.

At the MWC (World Mobile Communications Conference) held not long ago. Samsung announced that it will cooperate with Verizon, the largest wireline and voice communication provider in the United States, and showcase its 5G network devices, such as transmitting 4K Ultra HD video over a wireless network to a mobile vehicle. This is also one of the directions that 5G networks provide for VR development.

The industry believes that 5G network can bring great help to VR. On the opening day of MWC, SK Telecom Chief Technology Officer AlexJinsung Choi said: "In the case of 5G network use, the experience of combining VR and 5G will be the most attractive, users can really feel the true gap between 4G and 5G."

It is widely believed in the industry that this year is the first year of virtual reality. Chen Wenqi, president of VIA Technologies, said that the amount of data consumed by VR in the process of transferring data requires a very high bandwidth. However, the current 4G technology is far from meeting this demand, so the VR industry has an urgent expectation for 5G networks.

Third, the development of the Internet of Things also requires 5G networks as an important support point.

According to data provided by Juniper Research, it is estimated that by 2020, the total number of IoT devices will reach 38.5 billion units, an increase of 285% over 2015. However, the sheer number of devices is not what the current network infrastructure can handle. Therefore, 5G is an important foundation for realizing the "Internet of Everything".

In summary, it is the main reason why 5G networks are favored. Now, many Chinese and foreign companies are stepping up their research and development of 5G networks.

For example, ZTE's Pre5G technology is to use 5G core technology to innovate on the base station; another example is Google's acquisition of 5G network technology company Alpental; Microsoft uses TV for white space test; Facebook plans to make 5G part of Internet.org; Samsung's 5G Technology, the maximum transmission speed can reach 20Gbps. Samsung official estimates that these technologies will be commercially available as early as 2020.

It seems that 2020 is a year that is worthy of the support of all 5G network supporters and developers. The arrival of 5G networks will bring many changes to people, and there will be many problems on the road to realization. However, these issues may be resolved.

5G network brings more changes to N, technical problems are expected to be solved

First, the 5G network can not only bring speed to users, but also bring capacity expansion.

The reason why the speed of the network can be improved is mainly due to the wider opening of the wireless channel and millimeter wave technology by operators. In addition, the use of small base stations increases the coverage of the network, and thus the data transmission and exchange distances are also shortened.

However, for users, 5G network brings not only speed improvement, but more importantly, capacity expansion.

Hank, vice president of AT&T's network architecture department, believes that 5G networks can carry more devices. With the gradual deepening of the construction of the Internet of Things, the number of connected devices in the future will increase. At that time, the office security system and the broadcast on the car may join the 5G network army. It is expected that by 2020, the number of connected devices will show an explosive growth trend. People's clothing, smart hardware, furniture and other items will become a part of the 5G network.

In this regard, Roger Entner, the founder of the analysis company Recon AnalyTIcs, 5G network expert said: "With the continuous advancement of the Internet of Things revolution, 5G network will become the strong backing of billions of devices in the future."

Second, the network architecture will change dramatically.

Gartner expert Shama believes that 5G network has strong backward compatibility, in addition to its fast speed and low latency. Therefore, researchers can gain great autonomy in the transformation of the architecture.

For the benefits of the architectural changes, Shama believes: "5G wireless networks will join a new architecture like Cloud RAN (Cloud Wireless Access), localized micro data centers will rise, they can support such as industrial Server-based networking capabilities such as networked gateways, HD video caching, and transcoding. In addition, support for new topologies allows 5G to better manage more dispersed heterogeneous networks."

Third, people's reliance on WIFI will be reduced.

In the next few years, the development of 5G networks will advance by leaps and bounds. People no longer need to find the WIFI in the world. However, the possibility of coexistence of the two technologies is relatively large, so the progress of WIFI technology cannot be ignored. However, the future of carrying equipment will still fall on the 5G network, WIFI should be more home and auxiliary.

Entner said: "5G is very important, because the existing network design can not carry the huge amount of equipment in the future. The situation is far beyond the expectations of 10 years ago, we need to find an effective solution."

Although 5G networks currently face some technical problems, they are also expected to be resolved.

5G networks require higher frequency band transmission, which requires addressing antenna technology. Among the solutions explored in the industry, MIMO (Multiple Input Multiple Output) technology is an ideal choice.

MIMO technology was proposed by Bell Labs professors in 2010. The antenna size is usually hundreds or even thousands, which is much larger than the number of antennas in 4G networks. MIMO is a major breakthrough in antenna technology, which can double the capacity and spectrum utilization of communication systems without increasing the bandwidth.

In addition, millimeter wave technology can also be applied to the transmission of 5G networks. At present, the frequency band resources transmitted by the network are scarce, but the resources of the millimeter wave band (3 GHz-60 GHz) have not been fully developed. With the development of the network, the size of the base station antenna will also increase, and the wavelength length of the communication must be controlled. Therefore, millimeter wave technology can also be applied to the construction of future 5G networks.

In addition, FBMC (filter bank multi-carrier modulation) technology, dense networking, in-vehicle network, visible light communication can also be used as an alternative technology for transmitting 5G networks.

Entner said: "The 5G network will have a rapid development in the construction of base stations. At present, we don't know what wireless data transmission technology will be used in the future. Many people have different opinions on this issue." However, the ultimate structure of these technologies may be user-centric and multiple technologies coexist.

The first to experience the 5G network this time may not be the United States, but the Asian countries. Because Japan's NTT Docomo has already started testing 5G networks, South Korea may officially operate 5G networks before the opening of the PyeongChang Winter Olympics in 2018.

The 5G network has always been a topic of great interest. With the development of technology, the realization of 5G network layout is also coming out. This will bring many changes to the parties, and technical problems are expected to be resolved. In the next few years, we are likely to be able to enjoy the better experience brought by 5G networks.

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