Robust Power Control for 5G Small Cell Networks with Sleep Strategy
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Robust Power Control for 5G Small Cell Networks with Sleep Strategy Zhixin Liu1 · Jieshuai Wu1 · Yazhou Yuan1 · Xinping Guan2
© Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract In this paper, the resource scheduling and power control strategy is studied for a two-tier 5G network system, which is comprised of a central macrocell and several small cells. Because cellular deployment is ultra dense in the 5G network, a sleep strategy for small cells is proposed to reduce energy consumption caused by the cellular overlapping coverage. Specifically, the imperfect channel state information (CSI) is considered due to the complex and dynamic communication environment in practice. This work attempts to maximize the resource utilization and enhance the robustness of the power control strategy with imperfect CSI. An optimization problem with probability constraints is formulated, and the high rate requirements of 5G network users are included. A novel method is provided to convert probability constraints into deterministic ones. An iterative algorithm of power control to enhance the network efficiency is proposed further. Finally, numerical results are given to illustrate the effectiveness of the joint resource scheduling scheme. Keywords Small cell networks · Power control · Sleep strategy · Probability constraint
1 Introduction In recent years, as a promising technology, the fifth generation mobile communication technology (5G) rises sharply. As a new communication technology, 5G have a great many advantages, such as increased capacity, improved data rate, decreased latency and better quality of service, and so on. The ordinary single-layer network cannot match the 5G networks [1, 2]. The two-layer network is just a good choice to solve these problems, and small cells technology has gained great attention in both academia and industry. However, as small cells are deployed randomly on a super-large scale, there are some technical challenges such as cross-tier interference, network topology variation, cellular overlapping coverage, etc. Since the deployment of small cells for 5G network is super dense in order to meet the demand of complete coverage, the problem of cellular overlapping * Zhixin Liu [email protected] 1
School of Electrical Engineering, Yanshan University, Qinhuangdao 066004, China
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School of Electronic, Information and Electrical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
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coverage may seriously degrades the performance of 5G two-tier network systems [3, 4]. For instance, a user locates at the coverage regions of two cells at the same time. When the user transmits information to one of two cells, the other cell will be idle. This situation will cause the waste of base station resources. It also goes against the development of green communication. To reduce energy consumption caused by the 5G network cellular overlapping coverage, sleep strategy has been extensively studied in existing literature. As an effe
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