차세대 이동통신 시스템에서 밀집된 스몰셀 네트워크를 위한 혼합형 동적 채널할당 방법

Abstract

Abstract

Hybrid and Dynamic Channel Allocation for Dense Small-cell Networks in the Next Generation Mobile Communications

Ban IlHak Advisor : Prof. ChaiYeoung Jung, Ph.D. Department of Natural Science, Graduate School of Chosun University

Together with the 4th industrial revolution, mobile communication is moving into the next generation network. Internet speeds are getting faster, smart phones are becoming more diverse, mobile data is going to grow even faster, as it allows communication between machines and machines as well as communications between humans and humans. Increasing mobile data traffic has always been a problem. Many techniques have been developed and are under study to solve this problem. One of them is small cell technology. In the environment where only the existing macro cell was used, it was difficult to handle a large number of users while using a limited frequency. To overcome this problem, small cells were added to shaded areas in macro cells to improve capacity and system performance. However, the interference problem can not be avoided because macro cells and small cells use limited frequencies. In particular, terminals at cell boundaries are highly affected by interference. Macro terminals at macro cell boundaries are affected by interference from neighboring macro cells and small cells, and small cell terminals at the small cell boundary are strongly interfered by surrounding small cells and macro cells. In this paper, we propose a hybrid frequency reuse method to improve macro cell performance while efficiently utilizing scarce frequency resources. Comparing the performance with existing reuse methods, it is found that the performance of the terminals on the small cell boundary is similar but the performance of the terminals on the macro cell boundary is improved. In this paper, we propose an outage boundary to reduce the interference of small cells and improve the performance of macro users by using NBTC and WBTC. This paper is written to improve the performance of users in an environment where existing macro cells and small cells overlap each other. In this paper, we apply the hybrid and dynamic frequency resource allocation method using the existing frequency reuse method. This allowed us to improve the performance of the users of each cell while using the existing frequency. As a result of comparison, the proposed method improves the performance of the macro cell user and improves the performance by increasing the resource consumption of the small cell user. The proposed method is accessible with two perspectives. The performance of a small cell is improved by improving the performance of a macro cell user, and the performance of a small cell is improved by increasing the resource consumption of a small cell with respect to the performance of a macro cell user. These two perspectives will be used effectively in the upcoming next generation networks. The former is an advantage of improving the performance of the macro user by reducing the additional resources of the small cell when they are unnecessary, and the latter can be used to fill the scarce resources of the small cells while maintaining the performance of the macro users. This is because the liquidity can cope in some cases in a dense environment.