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          ZTEa€?s chief scientist Xiang Jiying: 5G calls for revolutionary innovation

          China's three major operators are currently accelerating the coverage of 4G base stations and promoting 4G applications on a large scale. China's 4G commercial business is not inferior to the 5G enthusiasm in developed countries. The a€?First Global 5G Conferencea€? was held in China, which is a direct reflection of China's vigorous promotion of 5G research and development and impact spillover.

          At the 1st Global 5G Conference, Dr. Xiang Xiangying, the chief scientist of ZTE Corporation, elaborated on the new multi-access and waveform technologies proposed by ZTE, including MUSA (Multi-User Shared Access) and FB-OFDM (Subcarrier Filtering OFDM). , UAI (unified air interface), Massive MIMO and other technologies. Xiang Jiying pointed out that 5G is used in the era of all things mobile internet, and the network connection is essentially different from 4G. a€?The evolution of 4G alone cannot be achieved, and revolutionary technological innovation is urgently needed.a€?

          IoT demand innovation

          Wireless communication technology has evolved from generation to generation, and even the name of LTE is "Long Term EvoluTIon". As human society moves into the era of mobile internet, tens of billions of connections will overwhelm existing communications. 5G is commercialized around 2020 and is synchronized with the Internet of Everything. Therefore, Xiangji believes that the evolution of 4G is very important, but the new revolutionary technology is more important for 5G.

          a€?The ITU has set a high target for 5G, and the evolutionary technology alone is extremely inefficient and even impossible to achieve.a€? Xiang Jiying pointed out that revolutionary technology must focus on a€?implementing complexitya€? from the outset. How to balance performance and realize complexity requires a full range of technological innovations: both high frequency and low frequency; both air and core networks; both eMBB and IoT.

          Taking IoT as an example, there will be 1 million connections per square kilometer in the 5G era, which is converted to the base station, which is more than 700 times. Even with 4G enhanced technology bearers, at least 13 carriers are required. However, operators often use very few resources for IoT, so they need to compress the number of carriers. Once compressed, the system will be filled with "overhead" messages.

          "In essence, LTE is not optimized for large connections. Even if only one bit is transmitted, it often requires hundreds of bits of 'overhead' messages. These 'overhead' messages are used to complete uplink synchronization and resource scheduling. For 4G OFDMA, Indispensable. At the same time, due to the conflict retreat and even the avalanche effect, using 4G OFDMA enhancement technology to barely meet the 5G IoT requirements will be very inefficient." Xiang Jiying said.

          5G technology is available

          Currently in the initial stage of 5G discussion, the industry does not have a unified view, of course, there is no uniform standard. For example, for the 5G air interface, there is a view that the low frequency of 5G only requires 4G evolved air interface. Xiangji Eagle believes that low-frequency and high-frequency also need new air ports. In the definition of UAI (unified-air-interface), regardless of low frequency and high frequency, a new air interface system can be used, but the parameters are different.

          Therefore, it can be said that the 5G technology currently developed by ZTE has considered the challenges faced by 5G in the future from a system perspective. For example, for the "overhead" message, ZTE proposed the MUSA technology, which completely eliminates uplink synchronization, scheduling, and related overhead through the free grant free, and the efficiency is improved by hundreds of times. At the same time, in order to avoid the problem that the "blind check" receiver is too complicated, the multiplexed multi-dimensional short code is adopted, and even if the length is only 4, thousands of low correlation codes can be obtained, thereby greatly simplifying the receiver implementation.

          For another example, the 4G service type is relatively simple, using the same subcarrier width, and a single subcarrier width cannot be optimized for all services. The 5G service type is diversified. If the 4G OFDM is maintained, serious inter-subcarrier interference will be introduced. A different protection band is required between different services. When there are many narrowband services, the protection band will cause serious waste of resources.

          In response to this problem, ZTE proposed FB-OFDM technology to control the guard band to a minimum or even a 0 guard band by subcarrier level filtering. Xiang Jiying said that the FB-OFDM out-of-band rejection capability is 20dB better than similar technologies. In addition, in order to solve the complexity problem of multiple subcarrier filtering, FB-OFDM converts multiple filters into mathematical transformations into windowed and Inter-symbol polyphase filters in the time domain, which can perform multiple subcarrier filtering at one time. .

          Technology and standard linkage

          Despite the premature 5G commercial use, the industry has taken precautions in standard setting. Xiang Jiying pointed out that the 4G evolution can be separated from the standard to a certain extent, relying on the innovation support of the implementation level, while the 5G revolution relies more on the standard. Currently, including ZTE, various companies are submitting 5G standard proposals independently to 3GPP. These standards are not similar and can be said to be parallel.

          After proposing a number of 5G tag technologies, ZTE submitted hundreds of proposals to core technologies such as Novel Numerology, Self contained Frame Structure, FB-OFDM waveform, LDPC coding, MUSA, and NG Core Proposal. In other words, ZTE has the ability to build a complete 5G system even if it does not rely on other companies.

          Cao Shumin, head of the China IMT-2020 (5G) promotion group and dean of the China Institute of Information and Communications, called on the industry to avoid fragmentation of the 5G standard. Xiang Jiying expressed great recognition. Standard fragmentation is not good news for the industry chain and equipment vendors. ZTE hopes to form a unified standard. The final standard is the result of the technical contribution and standard game of each enterprise. The quantity, value and completeness of the standards submitted by the enterprise determine the weight in the standard setting. a€?Enterprises submitting 5G standard proposals are part of the 5G standard integration.a€?

          It is reported that in the formulation of 5G standards, ZTE is a core member of IMT-2020, taking the lead in research on more than 30% of the topics, and has joined more than 40 global standardization organizations, alliances and forums, which are ITU, 3GPP, IEEE, NGMN, Japan. Members of international standards organizations/industry alliances such as 5GMF are one of the main promoters of 5G standards development.

          Of course, the 5G technology revolution is not in contradiction with the 4G evolution. In fact, ZTE has applied some 5G technologies to the existing network. Taking Pre5G Massive MIMO as an example, it has been commercialized on the existing network scale, and the existing 4G network spectrum utilization rate has been improved by 3-6 times. In the future, it can be smoothly evolved into 5G New Radio Massive MIMO through standard enhanced optimization. At the same time, the technology supports existing terminals, which means that the existing network can smoothly evolve to 5G first and last. In February of this year, this technology won the a€?Best Mobile Technology Breakthrough Awarda€? and a€?CTO Choice Awarda€? for the Global Mobile Awards, which was highly recognized by the industry.

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          高清性色生活片
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