With the continuous integration of informatization and industrialization, it has brought unprecedented development opportunities to the information and communication industry. The integration of "two technologies" is to integrate modern communication technology and information technology into the production process of traditional industries, in order to achieve the purpose of improving production efficiency, reducing production operation costs, and stimulating the growth of economic benefits of various industries. Huawei's eWBB wireless campus solution based on LTE, as a new type of production operation tool, uses the latest wireless broadband access technology to effectively address the major problems facing the campus network Main issues such as user communication, mobility, ultra-long-distance coverage, and interoperability with existing systems. Through the application of this new solution, various industrial fields will significantly increase the increment of economic benefits and generate a good return on investment.
1. The development of intelligent campus network requires wireless technology
Under the trend of wireless broadband and mobile development, smart parks are increasingly demanding wireless network technology. The simple voice function provided by traditional wireless networks can no longer meet the requirements of industrial informatization: a large number of video transmission requirements require the system to provide 100Mbps Even higher throughput rate; reliable QoS guarantee mechanism to ensure the reliable transmission of key information at all times; sensors all over the corners of modern industrial parks require the system to have an almost unlimited number of connections ... .
2. Challenges faced by wireless solutions in smart campus networks
1) Challenges facing WLAN technology
The current private network solutions for wireless campus networks in the industry are usually based on 802.11 WLAN technology. This technology is based on CSMA / CD. Application of this technology can provide limited broadband services for intelligent campus networks, but there are also many problems:
s transmission quality: when there are few users, it can provide users with better broadband services. When the number of users exceeds about 20, the transmission performance drops sharply, and the transmission bandwidth and QoS are difficult to guarantee; in addition, because APs work in ISM Frequency band, during the transmission process, it is very susceptible to interference from devices that also work in the ISM band (microwave ovens, other APs, cordless phones, etc.), thereby affecting the transmission quality of the system.
s Mobility: 802.11 series of technologies were positioned as office wireless broadband access at the beginning of research and development. Naturally, they do not support mobility. Users moving within the coverage of two APs will temporarily interrupt the connection with the network and affect system reliability.
s Maintainability: WLAN equipment has low transmit power, and a single AP can only cover 100-300m. Therefore, a large number of APs are required to complete the coverage of the enterprise park. The related engineering and subsequent maintenance workload is huge, and the detection of problems occurs. Maintenance is very difficult.
2) Challenges facing public network technology
At present, some enterprise campus network customers provide wireless broadband services for them through the public network operator network. However, due to the characteristics of the main customers they face, it is difficult for them to take into account the service quality of public and private network services:
s Network service quality: Ordinary public customers facing ordinary public network operators, focusing on coverage of hotspot areas, improving customer service experience, and improving APRU; while enterprise customers are more concerned about wireless solutions in various complex scenarios. Efficient integration of all aspects of the workflow to improve the operational efficiency of the enterprise. Due to the different demands of corporate customers and ordinary public customers, it is often difficult for public network operators to provide corresponding service quality to meet the improvement of corporate operational efficiency.
s Diversified Coverage Scenarios: The application of wireless smart parks covers energy, electricity, airports, large enterprises (hospitals, education) and other industries. The energy sector (such as oil, mining, etc.) is located in deserts, Gobi, remote mountain areas, or coasts. Public network operators often provide limited or no coverage in relevant areas. For example: offshore oilfields are often located in areas tens or hundreds of kilometers away from the coastline. It requires that a single base station can cover more than 100KM, and the throughput rate can reach tens or even hundreds of Mbps; mines, due to the mining terrain during mining The process is constantly changing, so the coverage area of ​​the base station is required to be as wide as possible, and its deployment location can be easily changed when needed.
s specialization: public network operators usually only provide standardized solutions for the public, and in the enterprise field, they often put forward higher professional requirements for the solution: the energy field requires high-security explosion-proof terminals to ensure absolute in daily operations Security; in the field of distribution automation, the terminal is required to have a 100% online rate to ensure real-time and reliable transmission of distribution data, and the ratio of uplink and downlink time slots for data transmission can be flexibly configured to facilitate business expansion; in the field of airport scheduling, A set of wireless system support is needed to provide services such as broadband data, voice, trunking and video. The entire command and dispatch data can be assigned to various executing agencies through a set of systems to enhance the coordination of operations ...
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