"On July 17, at the third" 5g and future network strategy seminar ", Wang Zhiqin, vice president of China Academy of ICT, explained the progress of the third phase of 5g testing in China.
Three stage test blueprint
China's 5g technology test began in 2016. Major global enterprises, including foreign related major enterprises, and even some international operators such as KDDI and NTT DoCoMo in Japan also participated in the test.
The third stage of 5g test is mainly divided into two parts according to the whole standard process of R15. The non independent networking uses 5g new wireless interface to access to the 4G core network, so 4G access can be used on the control surface of the wireless part, and 5g and 4G superposition can be used for data bearing. 5g independent networking, wireless and core networks adopt new technologies, which can better realize the bearing of end-to-end 5g new business capabilities.
According to Wang Zhiqin, in the third phase of 5g technology test, all indoor tests and some outdoor tests of independent networking have been basically completed in July this year. By September this year, all manufacturers will complete all independent networking tests and indoor tests of independent networking. "Maybe some leading enterprises will complete the testing of the whole independent networking, It is expected that this year's experiment and test will be completed by the end of the year. First, the independent networking test will be completed, followed by the independent networking test. First, the intermediate frequency test will be carried out, and then the millimeter wave test will be carried out successively. It is also a process from indoor to outdoor, from single system to interoperability and some typical business applications. "
Summary of test contents in three aspects
Wang Zhiqin said that in the actual experimental process, in addition to the specifications that have formed road signs in terms of technology and products, the industry also feels that the definition of 5g technical standards is very complex and flexible, because it has many more parameters than the original 4G in order to adapt to a variety of scenarios and needs of the Internet of things, which also poses a great challenge to product research and development. In order to reduce such complexity and take into account the interference of TDD among multiple operators, the 5g promotion group finally decided to adopt a 2.5ms dual cycle structure based on the unified frame structure in the third stage, focusing on the test method of frame structure in the mobile enhanced broadband scenario for the uplink capacity and downlink coverage. Subsequent manufacturers, including systems and terminals, develop products under this frame structure.
In addition, in order to build the corresponding 5g environment, MTNet Laboratory of ICT Institute has built all indoor test environments. In the second half of this year, performance tests will be carried out on some 5g system equipment, and the field tests are mainly carried out in Huairou field.
According to Wang Zhiqin, 5g phase III test also includes several key contents.
Indoor test
Including basic function test of wireless base station: physical layer function of 5g new air interface; Some channels, testability scheduling, radio resource control, etc. At the same time, especially for multi antenna technology, separate architecture in wireless networking and dual connection test for non independent networking are also the basic contents.
After the indoor test of the third stage non independent networking, from the perspective of the basic functions of the base station, most manufacturers have developed 3.5GHz pre commercial and commercial 5g base stations, and the hardware test can basically meet the commercial requirements. Some manufacturers have also developed 4.9ghz products. Therefore, from the current specifications, most of them are 64 channel, 192 formation and 200W macro base stations. During the test, the terminal is still a problem. Some manufacturers use their own mirrored base stations, and some manufacturers use third-party test instruments for simulation, so it will limit the realization of some test results to a certain extent. The whole test has shown that the enterprise's scheme can complete the main functions of the physical layer, including MIMO multi antenna, non independent networking and multi connection, Cu The key technology and overall architecture of Du separation. However, when it comes to performance measurement, especially wireless algorithms, some wireless resource control protocols and performance of mobility management need to be enhanced. In addition, the stability of equipment needs to be strengthened.
radio frequency
The RF index is formed according to the RF series index for 5g at 3.5GHz and if transmitters formulated at the beginning of the year. At present, the indexes of various manufacturers have basically met the target, especially the index of transmitter stray at 3.6ghz to 4.2ghz, which is formulated according to the stray index of transmitters in this area specially formulated by the Ministry of industry and information technology at the beginning of the test, All base station manufacturers have been able to meet the requirements“ Moreover, based on such an index, the interference test of the satellite system was also carried out in Huairou. "
Core network
From the perspective of 4G EPC core network system equipment form, some manufacturers have been able to realize the virtualization platform capability, and some are dedicated virtual equipment upgrades. The separation of control and bearer based on virtualization is more conducive to future development. Therefore, the test content also includes dual connection, wireless access restrictions, user terminal capacity processing, service quality, billing and usage report, network management functions, and typical service testing“ Overall, the function has been realized, and QoS parameters can be further optimized“ Some functions of billing and usage report involve performance improvement, which some manufacturers can't fully support. "
Most manufacturers have completed the indoor test. Some manufacturers have carried out outdoor test work, and have also conducted corresponding tests on delay, coverage and uplink enhancement. The cooperation between industrial chain enterprises needs to be further strengthened. 5g terminal products and chips are still in the process of joint debugging and R & D of technology and products, and the volume of test terminals is relatively large.
How to test for future business
Wang Zhiqin introduced that for some new services, especially for R16 or low delay and high reliability scenarios, there are more tests of some physical scenarios. For example, to build 5g artificial intelligence campus in the campus area, the first is 12 channel video real-time monitoring, and at the same time, 4 channels of video and artificial intelligence are superimposed, It can realize automatic identification of personnel in and out and tracking of one-way camera head.
For the application of low delay and high reliability in the Internet of vehicles, MEC edge cloud plays an obvious role in traffic control and early warning, and makes a useful attempt for some new technologies and businesses.
Wang Zhiqin concluded that at present, 5g phase III test is still in the middle stage. Huawei, ZTE, Ericsson, Nokia, Datang and other equipment manufacturers are gradually completing the test objectives, and will see more manufacturers' test results released in the near future.
At present, the test scenario of several mainstream equipment manufacturers is to test the independent networking based on the pre commercial platform. The overall basic functions and basic functions of completing the independent networking are relatively good. However, in terms of mobility management, testing, network management and other performance, many functions need to be further improved. Next, September is a node. It is expected to complete the indoor test of independent networking, the test of single system and interoperability, and the test and verification of some new technologies before the end of the year.
Original address: https://www.eeboard.com/news/5g-131/
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