Indoor Visible Light Communication Network Architecture And Resource Allocation

In recent years, along with the emerging of streaming media, mobile Internet, mobile multimedia and other new business, wireless communication bandwidth demand is growing. Outline of National medium and long-term Planning and Development of Science and Technology (2006-2020) mentioned one of the goal of information technology development is "master of broadband wireless mobile communication, and the next generation network core technology". National "Twelfth Five-Year Plan" proposed to build the next generation of national information infrastructure with broadband, fusion, and security. However, the wireless communication development is restricted by the microwave frequency spectrum resource. Although there are many technical improvement to increase bandwidth, the effect is very limited. In recent years, millimeter wave communication and THz communication have been prevalent, both are designed to expand the wireless communication frequency band to higher frequency, in order to improve the transmission bandwidth. But with the emerging of white LED devices, wireless communication becomes possible by using visible light band of higher frequency. Thus we can reach higher transmission rate, and at the same time avoiding wireless authorization band tension. On the other hand, the energy is an important restriction for the development of our national economy. With the explosive growth of communication capacity, energy consumption of the communication equipment become very prominent. In this context, the state begins to promote the green communication. White LED devices are called the next generation green solid light source. Compared with the fluorescent light source, it has lower power, higher brightness and smaller size. Moreover the light can be used as carrier, thus realizes the combination of green lighting and energy-saving communication. In addition, visible light waves band are not harmful to human body, thus guarantees the long-time safe communication under the environment. Therefore, indoor visible light communication based on white LED is a fast, flexible, and environmental broadband communication technology and it satisfies national strategic demand of developing broadband and green communication.The white light-emitting-diode (LED) based indoor visible light communication (VLC) realizes flexible, green and broadband access by using the next-generation green lighting device, white LED, as the communication source and the indoor free-space as the channel. It combines the advantages of both optical communication and wireless communication, and can be widely deployed in many occasions including the microwave-limited situations, indoor high-speed access and secure communication. Current study on this field mostly focuses on the system-level techniques, such as channel modeling, modulation and encoding methods. On the other hand, research on the network-level techniques of VLC still faces several challenges.In this paper, I concentrate on these problems and try to get some original achievements in mechanism and methods of VLC networking based on IEEE802.15.7standard. I build a heterogeneous network model of VLC and Wi-Fi, and propose a room-division-multiplexing access method. Compared with the traditional broadcast visible light communication network, RDM greatly improves the network throughput. In addition, a visible light communication network and LTE network fusion theory is proposed, signaling flow chart are given when the terminal switching between two networks. Based on these achievements, a comprehensive networking model and realization mechanism will be presented for VLC.