On July 24, Chairman of the State Grid Corporation of China, Party Secretary Liu Zhenya and President of the Korea Electric Power Corporation Zhao Huanyi exchanged views on issues of common concern and expressed that they will further deepen cooperation and promote mutual benefit. Liu Zhenya introduced China's energy resource endowments and electric power development status, and pointed out that the key to transforming energy development mode with electricity as the center lies in the construction of UHV power grids. He said that UHV AC/DC transmission technology is revolutionary and has milestone significance. It is not only of great importance for solving China's domestic energy development issues, but also can be used to build a transnational transcontinental grid, which will optimize global energy allocation and ensure energy security. The promotion of clean energy development has brought about important changes. He said that in the absence of a primary energy source in South Korea, the two sides can consider deepening cooperation in the field of UHV power transmission on the basis of existing cooperation to better solve the Korean energy issue.
Zhao Huanyi said that the State Grid Corporation of China has the world's largest power grid system and the world's leading power grid technology. It has significant influence in the world energy field and is worth learning from the Korea Electric Power Corporation. He said that South Korea's power shortage is serious and the price of electricity is relatively high. In the long run, building a super power grid in northeast Asia and promoting Sino-Korea networking will have far-reaching implications for solving Korea’s energy and power development issues. The State Grid Corporation of China and the Korea Electric Power Corporation have long-term friendly relations of cooperation and hope that both parties can carry out in-depth exchanges and cooperation in UHV transmission technologies and smart grids in the future.
Counselor of the ROK Embassy in China: Kim Jung-san, President of the Korea Electric Power Corporation Beijing Branch Kang Xian, Secretary of the Organizing Committee of the World Energy Conference Pu Xingcheng, Assistant to the General Manager of the Company and Director of the International Cooperation Department Du Zhigang, Corporate Development Planning Department, International The Ministry of Cooperation and relevant responsible comrades of the China Electric Power Enterprise Federation attended the meeting.
What is Car Ethernet
Car Ethernet is a new local area network technology that uses Ethernet to connect the electronic unit in the car. Unlike traditional Ethernet, which uses 4 unshielded twisted pair cables, car Ethernet can achieve a transmission rate of 100Mbit/s or even 1Gbit/s on a single pair of unshielded twisted pair cables. At the same time, it also meets the requirements of the automotive industry for high reliability, low electromagnetic radiation, low power consumption, bandwidth allocation, low latency and synchronous real-time. The physical layer of on-board Ethernet uses BroadRReach technology, and BroadR-Reach's physical layer (PHY) technology has been standardized by the One-pair Ethernet Alliance (OPEN). Therefore, it is sometimes called Broad RReach (BRR) or OABR (Open Alliance BroadR-Reach). The MAC layer of vehicle Ethernet adopts the IEEE 802.3 interface standard and seamlessly supports widely used high-level network protocols (such as TCP/IP) without any adaptation.
On-board Ethernet protocol architecture
Vehicle-borne Ethernet and its supported upper-layer protocol architecture are shown in Figure 1. Vehicle-borne Ethernet mainly involves OSI layer 1 and Layer 2 technologies, while vehicle-borne Ethernet also supports AVB, TCP/IP, DOIP, SOME/IP and other protocols or application forms.
On-board Ethernet framework
Among them, AVB is an extension of traditional Ethernet functions, which enhances the real-time performance of traditional Ethernet audio and video transmission by adding precise clock synchronization, bandwidth reservation and other protocols, and is a network audio and video real-time transmission technology with great development potential. SOME/IP (Scalable Service-Oriented MiddlewarE on IP) specifies the video communication interface requirements for vehicle camera applications, which can be applied to the field of vehicle cameras, and realizes the mode control of driver assistance cameras through apis.
As an extension of AVB protocol, Time-Sensitive Networking (TSN) introduces related technologies of time-triggered Ethernet, which can efficiently realize the transmission of automotive control information. In addition, the on-board Ethernet of the 1Gbit communication standard also supports Power Over Ethernet (POE) function and Energy-Efficient Ethernet (EEE) function. The POE function provides power for connected terminal devices while transmitting data through twisted pair cables, eliminating the need to connect external power cables to terminals and reducing the complexity of power supply.
On-board Ethernet standardization
In terms of in-vehicle Ethernet standardization, the IEEE802.3 and IEEE802.1 working groups, AUTOSAR, the OPEN Alliance and the AVnu Alliance have played a major role in promoting it.
The IEEE802.3 local area network standard represents the mainstream Ethernet standard in the industry, and the on-board Ethernet technology is developed on the basis of IEEE802.3, so the IEEE is currently the most important international standardization body for on-board Ethernet. In order to meet the requirements of the car, it involves the development of a number of new specifications and the revision of the original specifications within the two working groups of IEEE802 and 802.1, including PHY specifications, AVB specifications, and single-wire to data line power supply. In addition, AVB related to AV transmission, timing synchronization and other specifications also need to be standardized by other technical committees of IEEE, such as IEEE1722 and IEEE1588.
OPEN Alliance
The OPEN Industry Alliance was launched in November 2011 by Broadcom, NXP, and BMW to promote the application of Ethernet-based technology standards to in-car connectivity. The main standardization goal is to develop a 100Mbit/s BroadR-R physical layer standard and develop OPEN interoperability requirements.
AUTOSAR
AUTOSAR is a consortium of automotive manufacturers, suppliers, and tool developers that aims to develop an open, standardized automotive software architecture, and the AUTOSAR specification already includes the automotive TCP/UDP/IP protocol stack.
AVnu
The AVnu Alliance was formed by Broadcom in collaboration with Cisco, Harman and Intel to promote the IEEE 802.1 AVB standard and the Time Synchronization Network (TSN) standard, establish a certification system, and address important technical and performance issues such as precise timing, real-time synchronization, bandwidth reservation, and traffic shaping.
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