Recently, the International Telecommunication Union (ITU) announced a timetable for 5G technology standardization at a working conference held in San Diego, California. The official name of the 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 International Telecommunication Union has been standardized globally and will be recognized internationally. 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 are also capable of providing more than 1 million IoT devices with an average transmission speed of 100 megabits per second within 1 square kilometer.†In addition, the 2018 Winter Olympics in Pyeongchang, South Korea will be the first to enable 5G communications. .
The meeting also reached an agreement that work should be carried out under the name "IMT-2020" as the current global standards of the ITU International Mobile Communication System (IMT-2000 and IMT-Advanced, which are the basis of the current 3G and 4G mobile systems) ) Continuation.
The next step will be to formulate detailed technical performance requirements to support 5G wireless systems, while considering the needs of various future scenarios and usage conditions, and then stipulate the evaluation criteria for inclusion in the "IMT-2020" family of candidate wireless interface technologies. These new systems, scheduled to be launched 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 expand the scope of the Internet of Things (IoT).
It is expected that the ITU-R Radiocommunication Assembly in October 2015 will formally adopt the term "IMT-2020".
"The industry's discussion on the future development direction of mobile technology-5G is raging, and the focus now is to build a seamlessly connected society before 2020, and then bring people, things, data, applications, transportation systems, and cities together. In an intelligent networked communication environment." Houlin Zhao, Secretary-General of ITU, said, "ITU will continue to cooperate with the global mobile industry and government agencies in various countries to make'IMT-2020' a reality."
There are still big differences in the 5G technology route
At present, the world has reached a high consensus on 5G requirements and vision, and several main directions have been clarified in terms of technical routes and network architecture. However, overall, the industry still has different opinions in many areas of 5G.
The overall technical route of 5G is divided into two branches, including cellular mobile communications and wireless local area networks. At present, the strength and status of 802.11ax in the 5G industry cannot be compared with cellular mobile communications. The cellular technology route is further divided into two types: the new wireless air interface and the 4G evolution air interface. 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 problems of the Internet of Things scene. Specific to the innovation and evolution of 5G technology, the industry is quite divided. There are considerable controversies regarding the focus and scope of application of the 5G wireless new air interface and the 4G evolution air interface, and the combination of low frequency bands (below 6GHz) and high frequency bands (above 6GHz).
An evolution-oriented view is that the 5G high frequency band and new air interface focus on solving the problems of the Internet of Things scene, and the LTE evolution technology is mainly used in the low frequency band to meet the needs of the mobile Internet, and the new air interface is not required in the low frequency band. Another point of view that focuses on innovation is that 5G wireless technology has a large room 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 scenarios to form two different types of low-frequency and high-frequency. Technical solutions to meet the technical requirements of various scenarios of the mobile Internet and the Internet of Things.
Regarding the key technologies supporting 5G wireless technology, my country’s IMT-2020 (5G) Promotion Group proposed the "4+1" key technologies, including "large-scale antennas, new multiple access, dense networking, full frequency 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 the problem of diversified scenarios such as the Internet of Things. 5G is the first step in the interconnection of everything, and the cloud-based network architecture is an important part of it. The sliced ​​network that introduces the concept of SDN/NFV can meet the bandwidth and delay requirements of different scenarios. In addition, frequency is a topic that 5G cannot avoid, and it is the key to its success or failure. In response to the 5G high-traffic and high-density requirements, continuous spectrum above 300MHz is required. my country believes that it is best to find suitable spectrum in the 4GHz～6GHz frequency band and carry out frequency planning research work in the frequency band above 6GHz.
As for the spectrum efficiency and peak rate, there is no consensus internationally. 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 value in different scenarios should be different. The more popular view is spectrum efficiency. Compared with the IMT-Advanced system, it should be increased by 3 to 5 times. The ITU's current tentative 5G peak rate target value is 20Gbps, but because it is uncertain whether a single user can be allocated enough frequency resources, my country insists that it is more appropriate to set this target to 10Gbps.
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