Recently, the International Telecommunications Union (ITU) announced a timetable for standardization of 5G technology at a working conference held in San Diego, California. The official name of 5G technology is IMT-2020, the standard will be completed in 2020, and the international spectrum allocation will begin in 2019.
The 5G standard is named "IMT-2020"
It is reported that the International Telecommunication Union plans to complete the 5G target statement this year, and gradually define the technical performance requirements of 5G from the beginning of 2016. The 5G network proposed by the Telecommunications Union has been standardized globally and will be internationally recognized. With a 5G network of at least 20Gbps, users can download a UHD movie in 10 seconds.
According to the International Telecommunications Union, "5G networks will provide an average transmission speed of 100 megabits per second to more than 1 million IoT devices within 1 square kilometer." In addition, the Winter Olympics in Pyeongchang, South Korea will be the first to enable 5G communication in 2018. .
The meeting also agreed that work should be carried out under the name “IMT-2020†as the current global standard for ITU's international mobile communication systems (IMT-2000 and IMT-Advanced, which are the basis for current 3G and 4G mobile systems). The continuation of ).
The next step will be to develop detailed technical performance requirements for supporting 5G wireless systems, while considering the needs of various scenarios and usage scenarios in the future, and then to assess the evaluation criteria for inclusion in the "IMT-2020" family of candidate wireless interface technologies. These new systems, scheduled to be available in 2020, will introduce new connectivity models in mobile broadband wireless systems to support ultra-high definition video services, real-time low latency applications and extend the reach of the Internet of Things (IoT).
The term “IMT-2020†is expected to be formally adopted by the ITU-R Radiocommunication Assembly in October 2015.
“In the industry, the future direction of mobile technology – 5G discussion is very rampant. The focus now is to build a seamlessly connected society by 2020, and then bring people, goods, data, applications, transportation systems and cities together. In an intelligent, networked communications environment, ITU Secretary-General Houlin Zhao said, “ITU will continue to work with the global mobile industry and national government agencies to make 'IMT-2020' a reality.â€
5G technology routes still have big differences
At present, the world has achieved a high consensus on 5G needs and visions. Several major directions have been identified in the technical route and network architecture. However, the industry has different opinions in many areas of 5G.
The 5G's overall technical route is divided into two branches, including cellular mobile communications and wireless LAN. At present, the power and status of 802.11ax in the 5G industry cannot be compared with cellular mobile communications. In the cellular technology route, it is divided into two new wireless air ports and 4G evolution air ports. The industry generally believes that the 4G evolution air interface can meet the needs of the mobile Internet to a certain extent, and the new wireless air interface focuses on solving the problem of the Internet of Things scene. Specific to the innovation and evolution of 5G technology, there are major differences in the industry. There is considerable controversy on the combination of the focus and application range of the 5G wireless air interface and the 4G evolution air interface, and the combination of the low frequency band (below 6 GHz) and the high frequency band (6 GHz or higher).
An evolution-oriented view is that 5G high-band and new air-ports focus on solving the problem of IoT scenarios. In the low-band, LTE evolution technology is mainly used to meet the needs of mobile Internet, and no new air interface is needed in the low frequency band. Another innovation-oriented view is that 5G wireless technology has a large space for innovation. The low-frequency and high-frequency bands adopt a unified new air interface technology framework, which is adjusted according to frequency bands and scenes to form two different frequencies, low frequency and high frequency. Technical solutions to meet the technical needs of various scenarios of mobile Internet and Internet of Things.
For the key technologies supporting 5G wireless technology, China's IMT-2020 (5G) promotion group put forward the key technologies of “4+1â€, including “large-scale antenna, new multi-access, dense networking, full-band technology + new network architecture ". These technologies have formed a relative consensus at home and abroad, but each company will focus on it.
In terms of 5G network architecture, the industry generally believes that SDN/NFV-based platform technology is needed to implement a new network architecture, especially how to solve diverse scenarios such as the Internet of Things. 5G is the first step of the Internet of Everything. The clouded network architecture is an important part of it. The sliced ​​network with SDN/NFV concept can meet the bandwidth and delay requirements of different scenarios. In addition, the frequency is the topic that 5G can't be avoided, and it is the key to determine its success or failure. For the 5G large-flow, high-density demand, there must be more than 300MHz continuous spectrum as support. China believes that it is best to find a suitable spectrum in the 4GHz to 6GHz frequency band, and carry out frequency planning research work in the frequency band above 6GHz.
As for spectrum efficiency and peak rate, there is no international agreement. The preliminary analysis of the ITU requirements group shows that the multiple of spectrum efficiency improvement is closely related to the application scenario, that is, the target values ​​in different scenarios should be different. The more popular view is spectrum efficiency. It should be 3 to 5 times higher than the IMT-Advanced system. The ITU's tentative 5G peak rate target is 20Gbps, but because it is uncertain whether a single user can be allocated enough frequency resources, China insists that this target is set to 10Gbps more appropriate.
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