Research On Optimal Power And Position Of Small Cell For 5G Communication System

The exponential growth of data traffic in the future prompts the study about the fifth generation of mobile communication (5G). Current research all indicate that the most practical solution to improve network capacity is cell densification, which is to say the hyper-intense deployment of small cell coverage is the goal of 5G.5G is the fusion of various wireless communication techniques, which covers the shortage of 4G and improves the system performance in terms of the overall throughput, time delay, number of connections and energy consumption. It is foreseen that in the age of 5G the base station will be miniaturized more, equipped with more powerful features, be able to be installed in various environment and fuse together with the surroundings. Additionally the network structure will flat and it will be superposition of a powerful base station and a great sever cluster. Therefore, the conception of Heterogeneous Networks (HetNet) has been introduced, which brings in and deploys some Small Cell of low transmission power into the network. Small-cell is an effective way to improve the coverage of system, throughput and the overall performance of network. And it can be deployed indoor or in blind spots that macro eNB cannot cover, which can effectively improve the quality of wireless signal for the users indoor or in blind spot. At present, small cell attracts a lot of attention and is studied extensively.Small cell is an important form to provide data to improve data flow diversion. However, it is worth attention that how the small cellular base station can coexist with the macro cell base station. When the same spectrum is utilized, co-channel interference will be introduced. The thesis mainly studies the performance of the whole communication network by introducing the small cell to the macro cellular. Through the system-level simulation, the optimum position and power of the small cellular base stations will be evaluated. Firstly, the power allocation optimization problem is discussed under the HetNet scenario with small cells. It is well known that the coverage of small cell is also limited for the interference control purpose, therefore, the optimal power allocation issue for small cells is evaluated. Then, the deployment of optimum location of small base station in scene of small cells is studied. In the development of communication technology in the future, small cell network of super dense network organization will be the key issue to satisfy people’s requirement of higher wireless communication service. Through theoretical analysis and simulation results, the optimal locations of small cell are found under the macro network.By establishing the system-level simulation platform, this thesis simulates, analyzes and assesses the technical performance of small cellular in networking scenario. The results showed that in original cell of macro eNB, it makes sense to add a small base station at appropriate place for improving the performance of the whole communication system of the macro-cell.