I. Overall Background With the continuous advancement of smart grid construction and the high degree of integration with “Internet+”, the scale of power service terminals has expanded rapidly, and various industries have put forward higher requirements for power supply quality and user services of power grids. After years of construction, the power communication backbone network has a certain scale, and the power nodes connected through the optical fiber network play an important supporting role in improving the reliability of power supply and improving the service level. However, with the continuous expansion of power terminal scale and service application form, the existing terminal communication access network exposes some problems. On the one hand, it is difficult to build due to the high investment, slow coverage, long construction period, and difficult maintenance of the optical fiber network. To the comprehensive coverage of power terminals, comprehensive access to various types of communication services at the end of the grid cannot be realized; on the other hand, the leased wireless public network channel has poor security, competes with the public channel, uncontrollable communication quality, high rental fees, and 2G. Serious problems such as the withdrawal of the Internet. Based on the above reasons, the State Grid Corporation actively researches wireless private network solutions to help solve practical problems and achieve rapid access and coverage of the “last mile” service.

II. System Introduction Putian's new 230MHz broadband communication system is to transfer the key technologies of TD-LTE to the 223-235MHz working frequency band. The wireless communication system is deeply customized for the power industry. The system uses advanced carrier aggregation technology and spectrum sensing technology to realize broadband. Application and high anti-interference. The new 230MHz broadband communication system is compatible with the concept of contemporary Internet of Things. It has the characteristics of wide coverage, large capacity, low investment and fast deployment, and can carry data, voice and video services.

The system adopts the standard LTE flat network architecture. Compared with the original 2G and 3G networks, the flat network architecture can reduce networking costs, reduce system delay, and increase networking flexibility. The main network elements include core network equipment (EPC), network management equipment (eOMC), base station equipment (eNodeB), and wireless terminal (UE). The network architecture is shown in Figure 1.

Figure 1 Architecture diagram of the new 230MHz broadband communication system

Core network equipment (EPC): responsible for terminal authentication, terminal IP address management, mobility management, etc., providing interfaces directly to the main service of the power service.

Network Management Equipment (eOMC): Responsible for remote configuration management and status monitoring of core networks, base stations, and wireless terminals.

Base station equipment (eNodeB): responsible for communicating with wireless terminals through a spatial interface, and implementing functions such as resource scheduling, radio resource management, radio access control, and mobility management.

Wireless terminal (UE): The wireless terminal provides wireless data collection and transmission, and can be directly embedded in a power terminal such as a power collection device and a load control.

Third, the system function The new 230MHz broadband communication system design concept is wide-narrow integration, one network multi-purpose, can support the following business functions.

2 data service

The system provides two-way data communication capability. The wireless terminal has dynamic and flexible communication rate. The external design RS232 serial interface and RJ45 Ethernet port support common power data transmission services, including power information collection, distribution automation, distributed power supply, Charge the power station (pile) and so on.

According to the requirements of power security protection, the system provides an end-to-end security solution. From the terminal to the base station, the base station to the core network are two-way authentication, encrypted transmission, and integrity detection. The core network data enters the service main station in the production control area through the secure access zone, and enters the service main station in the information management area through the secure access platform. The safety channel is shown in Figure 2.

Figure 2 Power service access channel map

2 cluster voice

The system has a handheld voice terminal, and can cooperate with the cluster software platform to implement cluster voice services, including single call, group call, multi-party call, broadcast, video scheduling, and remote conference.

2 video transmission

Through the wireless terminal with carrier aggregation function, the broadband transmission of the camera video stream can be realized, and the video of the fixed and mobile camera can be unifiedly managed, and the services such as power field video monitoring, mobile inspection, and transmission motor inspection can be supported.

Fourth, the program highlight frequency innovation application

The wireless spectrum is a non-renewable national strategic resource. Today, with the rapid development of communication technology, all countries in the world are committed to adopting new technologies and new methods to continuously improve the utilization of spectrum resources. This solution breaks through the traditional 230MHz digital radio technology model, adopts TD-LTE key technology to improve spectrum efficiency and improve the shortage of traditional digital radio. The national radio management department also supports the innovative application of 230MHz wireless frequency band, and actually authorized more. More wireless frequencies support the national grid to carry out broadband applications in this band, and achieved good results.

Wide and narrow design

The carrier aggregation technology is used to achieve efficient use of discrete frequency points. In the R10 version, 3GPP proposes a carrier aggregation technology to enhance system capacity, increase single cell throughput, and reduce cell interference by utilizing greater bandwidth between multiple consecutive or discrete carriers. The new 230MHz broadband communication system realizes carrier aggregation of multiple 25 kHz discrete frequency points in the low frequency band. In the same wireless network, wireless terminals can be configured to use different communication bandwidths for different service communication requirements, achieving wide and narrow convergence and multi-network use.

Power deep customization

The new 230MHz broadband communication system is deeply customized for power service requirements, optimizes communication protocols, reduces transmission delay, increases the number of terminals in the resident network, designs communication modules that comply with the power protocol, and adapts the design to the mainstream power terminals in the industry. The difficulty and cost of network deployment.

Low cost and wide coverage

The 230MHz frequency band is a low frequency band, which has the advantages of strong diffraction capability and long transmission distance, and the advantages of advanced coding and demodulation technology to achieve low cost and wide coverage. Compared with wireless systems in other frequency bands, a single base station can cover a larger area, that is, more base station equipment can be used to cover more areas, thereby achieving the purpose of cost reduction and efficiency increase.

V. Testing and Application A number of test certifications have been obtained in the design and application of the new 230MHz broadband communication system, which proves that it can become the main wireless communication method for the power terminal access network.

As early as February 2012, the China Electrical Engineering Society organized a scientific achievement appraisal meeting in Beijing. The appraisal committee unanimously agreed that the new 230MHz power wireless broadband communication developed by using key technologies such as carrier aggregation and interference coordination should be based on the requirements of smart grid application. The system, for the first time applied internationally, is innovative.

In June 2012, the Radio Management Bureau of the Ministry of Industry and Information Technology held the “230MHz Band Management and Technology Innovation Seminar”. The conference focused on 230MHz frequency band management and technological innovation, combined with the situation faced by the development of radio broadband communication technology, and advanced new technologies such as carrier aggregation and spectrum sensing. The technology pays attention and support in the application of intelligent distribution grid, and clarifies the idea of ​​driving innovation in spectrum resource management through new technologies and new applications.

In March 2014, the State Grid Science Research Institute conducted a security test on the new 230MHz wireless broadband communication system. The verification system has external attacks to prevent pseudo terminals, pseudo base stations, and illegal core networks, and the security is extremely high.

In the second half of 2016, the State Grid promoted the pilot work of the power terminal communication access network, confirming that the new 230MHz wireless broadband communication system is one of the two main communication technologies, and unified the wireless performance test, system security test, and business support capability test. , all obtained satisfactory conclusions.

In 2017, under the organization of the radio management department, the key technology communication test of the new 230MHz wireless broadband communication system was carried out in Jiaxing, Zhejiang, Wulong, Chongqing, and Jinjiang, Fujian, and successfully passed the acceptance test in June 2017. The experts at the meeting unanimously recommended the next expansion. Scale trials will realize the scale of business access.

In September 2017, the inaugural meeting of the China Radio Association Power Wireless Private Network Industry Alliance was held in Beijing. Representatives from 39 member units such as the National Radio Monitoring Center and Putian Technology attended the meeting. The industry alliance aims to strengthen the R&D and application of wireless private network technology based on LTE 230, formulate and promote the standard system of power wireless private network, build a complete industrial ecology of power wireless private network, and promote the development of power wireless private network industry. Wang Jiye, director of the Ministry of Information and Communication of the State Grid, spoke at the meeting, pointing out that the power wireless private network has become the most effective way to support the construction of terminal communication access networks due to its economic efficiency, flexible deployment and wide application.

National Grid Business Application

The new 230MHz broadband communication system has been researched and developed since 2009. After years of continuous improvement and multiple pilot network application practices across the country, the system has matured. The provinces and cities that have built LTE230 power wireless communication network include and are not limited to Beijing, Tianjin, Weibei, Jiangsu, Zhejiang, Chongqing, Shandong, Fujian, Hubei, Shanxi, Qinghai, Ningxia, Shenzhen, Guangzhou, etc. In 2014, the “New 230MHz Power Wireless Broadband Communication System Research and Application Project” won the second prize of State Grid Corporation Science and Technology Progress Award.

Ø Zhejiang Jiaxing Power Wireless Network

Zhejiang Jiaxing Haiyan County Power Supply Co., Ltd. began to research and apply the new 230Mhz power wireless broadband communication system and application in 2010, and was designated as the first city in the country to carry out the pilot application of TD-LTE technology in smart grid. As of October 2017, a communication network consisting of 11 wireless base stations was built, and 7584 wireless communication terminals were actually connected. The power service applications carried by the 230MHz power wireless broadband communication system involved power consumption information collection, distribution monitoring, and fault indicators. , video transmission, mobile applications, distribution automation, distributed power, charging and replacing (station) piles, street lamp management, voice clustering, etc. With the unified planning and deployment of the national grid terminal communication access network, Jiaxing Haiyan's wireless network is also under continuous construction, and through continuous research and exploration, based on wireless applications to improve the management level and work efficiency of the smart grid. As shown in Figure 3.

Figure 3 Schematic diagram of Jiaxing Haiyan network coverage

Ø Jiangsu Kunshan Power Wireless Network

There are many factories in Kunshan City, and there are many users in the special-purpose. The load control terminal has higher requirements on the rate and delay of the communication channel. However, the digital radio technology used in the past is backward, and it is impossible to guarantee the timely acquisition of load data and the real-time delivery of control commands. . Kunshan Electric Power Company built a new 230MHz broadband communication system consisting of 14 base stations, covering 1000 square kilometers of Kunshan City, and the first batch of 3,000 enterprise user load control terminals, the system access capacity increased by 50~60 times, data acquisition and The control efficiency is obviously improved, and at the same time, the integration of the three functions of power consumption data collection and feedback, power load control, power distribution monitoring, and low-voltage set-copying are realized. As shown in Figure 4.

Figure 4 Jiangsu Kunshan network coverage simulation diagram

Other industry applications

The new 230Mhz power wireless broadband communication system has broad and deep coverage advantages and is also widely used in smart oilfield business applications. It is used as a production data automatic collection service, a wellsite HD video surveillance service, and a difficult well site HD picture monitoring service.

In addition to power, petroleum and other energy industries, the new 230Mhz power wireless broadband communication system can also build a wireless private network for agriculture, forestry and other fields, providing a wealth of Internet of Things applications.

6. In addition to providing a higher data rate, an important goal of 5G technology is to achieve the Internet of Everything. The Internet of Things will be widely used in a variety of applications such as power, petroleum, agriculture, forestry monitoring, meter reading, asset management, etc. The scenario, the new 230MHz broadband communication system has taken a solid step in this process.

Putian Technology helps build a “strong smart grid”. Starting from the demand of “last mile” communication between energy Internet and smart grid, it explores the construction of wireless private network technology application innovation model that meets the characteristics of power business, through real-time perception of grid equipment and users. Interact with and support the intelligent operation of the power grid and the active use of electricity services. Create a sense of the terminal business and data control capabilities, promote the power grid operation level and service model quality leap, create a carrier for the "Internet + service, marketing, transportation inspection, scheduling, materials, management" practice, and ultimately promote the refinement of power grid planning Accurate construction investment, accurate power grid dispatching and marketing service initiative.

With the development of mobile communication technology, especially the Internet of Things access scenario brought by the 5G standard, many new technologies have been stimulated to improve. The new 230MHz broadband communication system will gradually introduce relevant 5G core technologies to rapidly improve the wide and deep coverage of the network. The main network performance, such as low latency and high reliability, promotes the smooth evolution of the power wireless communication private network to 5G technology.

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