China's 5G technology research and development work plan and key technology test progress

Under the organization of the IMT-2020 (5G) promotion group, Chinese enterprises, universities and scientific research institutions have carried out all-round 5G research and development, and have achieved a series of research results in the field of 5G demand, technology and spectrum, which has effectively promoted global 5G technology. The development of standards. At present, the 5G vision and demand research has been completed and a global consensus has been obtained. The industry has taken the lead in clarifying the 5G technology route and core key technologies, and has released 5G wireless and network technology architecture. At present, 5G standardization work has been started. China officially launched the 5G technology R&D test in January 2016. China's 5G technology research and development trials are open to foreign companies. Currently, the participating units include China Information and Communication Research Institute, China Mobile, China Unicom, China Telecom, Domestic and foreign companies such as Como, Huawei, ZTE, Datang, Ericsson, Samsung, Nokia and Shanghai Bell, Intel, Qualcomm, Spreadtrum, Rohde Schwarz, Keysight, and Galaxy Highlights, covering operators and equipment manufacturing All links of the industrial chain, such as enterprises, chips and instrument companies. The participation of domestic and foreign enterprises is conducive to promoting the consensus of 5G key technology standards and laying the foundation for the construction of 5G industry chain.

The overall goal of China's 5G technology R&D test is to promote 5G core technology maturity and promote 5G technology research and development through 5G test; verify 5G technology design, develop 5G technology concept prototype that meets ITU performance indicators, and lay the foundation for 5G product development; The global 5G joint test platform promotes the formation of a globally unified 5G international standard.

Based on the 5G work plan determined by ITU and 3GPP, combined with the 5G R&D plan of major global enterprises, China's 5G test is implemented in two steps. The first step is 5G technology R&D test (2016-2018), the main goal is to support 5G international standards. The second step is the 5G product development test (2018-2020). The main goal is to carry out 5G pre-commercial testing based on the first version of the 3GPP standard. At present, the main research and development of 5G technology research and development is carried out. The overall planning of China's 5G technology research and development test is in three stages:

The first phase (January 2016 to September 2016) 5G key technology verification phase

The main objective of this phase is to evaluate the performance of 5G candidate key technologies through the testing of 5G single key technology prototypes, and promote the consensus of 5G key technology standards. The test targets are key technology test prototypes developed by mainstream enterprises in the industry.

The second phase (June 2016 to September 2017) 5G technical solution verification phase

This phase is mainly for the 5G performance indicators determined by the ITU. It is based on the 5G concept prototype developed by different manufacturers' 5G technology solutions to verify the performance of 5G technical solutions of different manufacturers and support the formulation of international standards. At this stage, uniform equipment specifications and test specifications will be developed, and third-party test instruments will be used to conduct single-base station performance tests in a unified test environment.

The third phase (June 2017 to October 2018) 5G system verification phase

The main objective of this phase is to build a 5G typical application scenario through a multi-base station high-low frequency hybrid networking, carry out the key technology verification of the 5G system networking, evaluate the performance of the 5G system under the networking conditions, and carry out the 5G typical service demonstration. To lay the foundation for the subsequent 5G trial commercial.

China's 5G technology R&D test was launched in January 2016. As of September 15, 2016, under the organization of the promotion group, domestic and foreign mobile communication equipment manufacturers, operators and scientific research institutions have cooperated successfully and have successfully completed 5G technology research and development. Test the first phase of the test.

Huawei, Datang, ZTE, Ericsson, Nokia/Shanghai Bell, Samsung, Intel and other 7 domestic and foreign companies completed the first phase of testing, involving wireless key technologies including large-scale antennas, new multi-site, and ultra-dense networking. , high-band communication, new multi-carrier, advanced code modulation and full-duplex.

Large-scale antenna array is the most effective means to improve the spectrum efficiency of 5G system. MIMO technology has been widely used in 4G systems. Faced with the challenges of 5G transmission rate and system capacity, the further increase of the number of antennas will be important for 5G technology. The direction of evolution. Based on the performance test results of the test prototypes of Huawei, ZTE, and Datang large-scale antenna arrays, by increasing the number of antenna ports to 64-128, compared with LTE-A, 3 to 4 times higher spectral efficiency can be achieved. Key technologies such as multiple access and advanced coding can meet the 3 to 5 times improvement of ITU spectrum efficiency indicators. A low-cost large-scale antenna system for commercial use will be an important research direction.

As an innovative 5G technology direction, the new multi-access technology transmits multiple user information on the same time-frequency resource, and uses the advanced receiving algorithm to separate user information at the receiving end, which not only doubles the access of the system. Capacity can also effectively improve the system spectrum efficiency. In the test, the performance test of Huawei sparse coded multiple access (SCMA), ZTE multi-user shared access (MUSA) and Datang pattern split multiple access (PDMA) concept prototype is compared with the existing LTE system. The new multi-access technology can increase the uplink user access capacity of the system to three times, and the downlink cell average throughput gain can reach more than 86%, but the new multi-access technology receiver has higher complexity, especially with large-scale antennas. In the case of combining high-order modulation, therefore, research on low-complexity receiver algorithms will be the focus of subsequent research.

As an important technical direction for the future 5G, high-band communication will play an important supporting role in meeting the 5G peak rate and system capacity indicators. Therefore, it has received extensive attention from mainstream enterprises in the industry. By testing the high-band test prototypes of companies such as Ericsson, Huawei, Samsung, ZTE, Nokia and Shanghai Bell, the high-band technology solution is supported to support the large-bandwidth and high-rate data transmission. At the same time, the high-band non-view is also verified. Performance from transmission. The high bandwidth and large bandwidth can meet the ITU peak rate specification requirements of 10 to 20 Gbps.

The new multi-carrier technology reduces the out-of-band leakage by filtering, which can more effectively support asynchronous transmission based on different sub-bands. Through the testing of Huawei, ZTE, Ericsson and Shanghai Bell's new multi-carrier technology solutions, the performance of the new multi-carrier technology is verified. Compared with OFDM technology, the new multi-carrier can fully utilize the system protection bandwidth for data transmission and obtain higher spectrum. The efficiency of use, at the same time, in the face of 5G different scenarios and business needs, the system bandwidth can be divided into different sub-bands, different sub-bands use different technical solutions for asynchronous transmission, no impact on system performance.

The advanced coding and modulation technology test mainly verifies the performance of the polarization code. The polarization code is a new type of coding method. It is also a candidate coding technology scheme in the current 3GPP standard formulation. It is still and moving through the Huawei polarization code test prototype. The performance test in the scenario, for the short code length and the long code length, under the same channel conditions, the error rate performance gain of 0.3-0.6 dB can be obtained with respect to the Turbo code. At the same time, Huawei also tests the polarization. The combination of code and high-band communication achieves a data transmission rate of more than 20 Gbps, which verifies that the polarization code can effectively support the three application scenarios defined by the ITU.

Full-duplex technology is a new type of duplex technology. Through the high-efficiency self-interference cancellation scheme, simultaneous simultaneous-frequency full-duplex transmission and reception can be realized. Therefore, the core of the full-duplex technology is self-interference cancellation, and the full duplex is passed to Huawei. The test of the prototype can achieve 113dB self-interference cancellation capability under the condition of 20MHz bandwidth and 2 antenna transmission and reception.

Ultra-dense networking can achieve higher spectrum reuse efficiency through denser wireless network infrastructure deployment, thereby achieving 100-fold increase in system capacity in local hotspots, which is the main requirement for meeting mobile data traffic in 2020 and beyond. Technical means. Through the test of Datang ultra-dense networking test prototype, it is verified that the key technologies such as virtual cells in ultra-dense networking can meet the advantages of system capacity and user experience rate. Under 100MHz bandwidth, the coverage area is 300m2. In this case, the system throughput of 3.3 Gbps can be achieved, and the traffic density can be equivalently achieved by about 11 Tbps/km2, which can meet the requirements of the ITU traffic density index.

Huawei, ZTE, Datang, Ericsson, Nokia/Shanghai Bell and Intel have completed key network technology tests. The key technologies involved in the network include network slicing, mobile edge computing, control and bearer separation, and network function reconfiguration.

Network slicing technology, through the slicing technology can change the original network rigid pipeline mode. The functions of slice template, slice lifecycle management, multi-slice access, slice sharing, and slice operation and maintenance are basically mature, and the ability to construct different characteristic network slices based on 5G scenarios and requirements can be realized.

Control and bearer separation, compared with the traditional network can achieve complete separation of control functions and forwarding functions, network functions can be scheduled and reconstructed as needed to meet different scene differentiation requirements.

Network function reconfiguration, 5G network equipment can be realized based on virtualization technology, hardware platform adopts general x86 server, and cloud management system is based on open source technology. The network equipment based on virtualization technology has a certain decline in computing performance and communication performance compared with dedicated hardware, but it is more flexible and efficient in resource utilization efficiency.

Mobile edge computing, the mobile edge computing technology in the 5G network can implement the functions of local routing, blocking, transparent transmission, rate limiting, charging, and switching of services, which can effectively reduce service delay and improve the user experience of video services.

The first phase of the 5G technology R&D test has been successfully completed. The IMT-2020 (5G) promotion team started the drafting of the second phase test specification in June 2016, and plans to complete the development of wireless key technology test specifications in October, 2016. The second phase of wireless technology testing will be launched before the end of the year, and the second phase of network technology testing will be launched in mid-2017.

The second phase of the 5G technology R&D test will be based on a unified platform, unified test frequency, unified equipment and test specifications, and will be used for 5G typical scenarios such as continuous wide area coverage, hotspot high capacity, low latency, high reliability and low power consumption. To verify the functionality and performance of different vendors' technical solutions. In addition, 5G core network enhancement and key technical solutions for wireless access networks will be tested. In addition, it will also focus on promoting system, chip and instrument manufacturers to carry out multi-party docking tests and foster 5G industry chain.

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