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2017 17th IEEE International Conference on Communication Technology (ICCT 2017)

作者： Xueming Sui Hui Zhang Yuanhong Lv Key Laboratory of Optoelectronic Sensor and Sensing Network Technology Nankai University

With the growth of wireless communication services, large base stations will not only produce a lot of electromagnetic radiation, but also bring huge energy consumption, resulting in a large number of greenhouse gases. The fifth generation mobile communication will deploy the macro base stations and the micro base stations in multi-layer heterogeneous network to enhance the system network performance, reducing the negative impact of abovementioned factors. According to the theory of cell communication, in this paper, by adding the micro base stations distributed in different grid modes in the surrounding area of the macro base station, the purpose is to maximize the total area covered by the base stations in the cell under the condition that the total power consumption of the base stations is not increased.

关键词： heterogeneous network base station distribution cellular network Voronoi diagram coverage performance

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Analytical Study on Multi-Tier 5G Heterogeneous Small Cell Networks: coverage performance and Energy Efficiency

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SENSORS 2016年第11期16卷 1854-1854页

作者： Xiao, Zhu Liu, Hongjing Havyarimana, Vincent Li, Tong Wang, Dong Hunan Univ Coll Comp Sci & Elect Engn Changsha 410082 Hunan Peoples R China Xidian Univ State Key Lab Integrated Serv Networks Xian 710071 Peoples R China

In this paper, we investigate the coverage performance and energy efficiency of multi-tier heterogeneous cellular networks (HetNets) which are composed of macrocells and different types of small cells, i.e., picocells and femtocells. By virtue of stochastic geometry tools, we model the multi-tier HetNets based on a Poisson point process (PPP) and analyze the Signal to Interference Ratio (SIR) via studying the cumulative interference from pico-tier and femto-tier. We then derive the analytical expressions of coverage probabilities in order to evaluate coverage performance in different tiers and investigate how it varies with the small cells' deployment density. By taking the fairness and user experience into consideration, we propose a disjoint channel allocation scheme and derive the system channel throughput for various tiers. Further, we formulate the energy efficiency optimization problem for multi-tier HetNets in terms of throughput performance and resource allocation fairness. To solve this problem, we devise a linear programming based approach to obtain the available area of the feasible solutions. System-level simulations demonstrate that the small cells' deployment density has a significant effect on the coverage performance and energy efficiency. Simulation results also reveal that there exits an optimal small cell base station (SBS) density ratio between pico-tier and femto-tier which can be applied to maximize the energy efficiency and at the same time enhance the system performance. Our findings provide guidance for the design of multi-tier HetNets for improving the coverage performance as well as the energy efficiency.

关键词： heterogeneous networks small cells energy efficiency coverage performance

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Multi-Objective Deployment Optimization of UAVs for Energy-Efficient Wireless coverage

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IEEE TRANSACTIONS ON COMMUNICATIONS 2024年第6期72卷 3587-3601页

作者： Zhu, Xiumin Zhai, Linbo Li, Nianxin Li, Yumei Yang, Feng Shandong Normal Univ Sch Informat Sci & Engn Jinan 250014 Peoples R China

Recently, Unmanned Aerial Vehicles (UAVs) have attracted much attention due to their flexibility and low cost. However, there are limitations for multiple UAVs such as limited energy and collaborative coverage. To achieve a better coverage performance, each UAV needs to find the optimal position to cover many ground users while saving energy. However, there are trade-offs between coverage utility and energy consumption. In this paper, we study a multi-UAV communication scenario where multi-UAV array is deployed to provide wireless coverage for mobile ground users. Considering the number, 3D positions, and speeds of UAVs, we formulate a coverage Utility and Energy Multi-objective Optimization Problem (CUEMOP) to simultaneously maximize the total coverage utility and minimize the total energy consumption of UAVs. Due to the complexity and NP-hardness of the formulated CUEMOP, we propose Improved Multi-objective Grey Wolf Optimizer (ImMOGWO) algorithm. In this algorithm, we design the Role Determination (RD) algorithm to cluster the ground users and prepare for initialization of UAV number and position. Hybrid solution initialization (HSI) algorithm is to initialize multi-dimensional variables and overcome algorithm inefficiency caused by random initialization. The Levy flight and Sin Cosine method based on the MOGWO algorithm (LSCMGA) is proposed to increase the diversity of solutions and ensure the convergence effect of the algorithm. Simulation results verify that proposed ImMOGWO algorithm has better performance than some other benchmark methods.

关键词： Autonomous aerial vehicles Optimization Clustering algorithms Wireless communication Energy consumption Three-dimensional displays Base stations Multiple UAVs multi-objective optimization problem coverage performance energy efficiency

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A method for spatial effective coverage analysis in space-based optical observation

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OPTIK 2018年 166卷 116-126页

作者： Ji, Hao-ran Zeng, Guo-qiang Natl Univ Def Technol Coll Aeronaut & Astronaut Deya Rd 109 Changsha 410073 Hunan Peoples R China Wuhan Univ Inst Aerosp Sci & Technol Bayi Rd 299 Wuhan 430072 Hubei Peoples R China

Space-based optical observation is now developing rapidly and many researches have been done to analyze the various requirements for targets to be visible. However, there were few studies providing intuitive methods to solve the boundary of the effective coverage and the effective coverage rate integral, which are desperately needed to evaluate the actual coverage performance for the optical sensor systems. In this study, different shapes of field of views (FOVs) of an optical sensor and space geometrical visibility constraints are mapped to an observation celestial sphere mapping surface (OCSMS), which makes it feasible and convenient to calculate the effective coverage. This method shall be of significance for calculating the spatial covering capacity of optical sensor systems and furtherly optimizing the selection, installation and configuration of sensors during the design of space-based observation spacecraft. (C) 2018 Published by Elsevier GmbH.

关键词： Space-based optical observation coverage performance coverage rate integral Observation celestial sphere mapping surface

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Decoupled Downlink-Uplink coverage Analysis with Interference Management for Enriched Heterogeneous Cellular Networks

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IEEE ACCESS 2016年 4卷 6250-6260页

作者： Muhammad, Fazal Abbas, Ziaul Haq Abbas, Ghulam Jiao, Lei Ghulam Ishaq Khan Inst Engn Sci & Technol Fac Elect Engn Topi 23640 Pakistan Ghulam Ishaq Khan Inst Engn Sci & Technol Fac Comp Sci & Engn Topi 23640 Pakistan Univ Agder Dept Informat & Commun Technol N-4898 Grimstad Norway

Heterogeneous cellular networks (HetCNets) offer a promising solution to cope with the current cellular coverage crunch. Due to the large transmit power disparity, while following maximum power received (MPR) association scheme, a larger number of users are associated with macro-cell BS (MBS) than small-cell BSs (SBSs). Therefore, an imbalance load arrangement takes place across the HetCNets. Hence, using cell range expansion-based cell association, we can balance the load across the congested MBS. However, using MPR association scheme, users' offloading leads to two challenges: 1) macro-cell interference, in which the MBS interferes with the offloaded users, and 2) coupled downlink-uplink cell association, in which a random user associates with a single tier's base station (BS) both in uplink (UL) and downlink (DL) directions. This paper aims to address these problems while considering a two-tier scenario consisting of small-cell and macro-cell tiers. For the MBS interference mitigation, we employ a reverse frequency allocation (RFA) scheme. Besides coupled DL UL association (Co-DUA), this paper also highlights the notion of decoupled DL-UL association (De-DUA). In De-DUA, a random user associates with two different tiers' BSs, i.e., with one tier's BS in the DL direction and with the other tier's BS in the UL direction. Our results illustrate that, in comparison with the Co-DUA, De-DUA with RFA employment achieves a better coverage performance.

关键词： Heterogeneous cellular networks small-cell BSs reverse frequency allocation decoupled downlink-uplink association coverage performance

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Path coverage enhancement in wireless sensor networks based on CVT model

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WEB INTELLIGENCE 2021年第1-2期19卷 13-25页

作者： Yu, Guangxu Henan Inst Econ & Trade Sch Comp Engn Zhengzhou 450018 Peoples R China

In order to overcome the problems of low detection probability, low coverage uniformity and low coverage of current path coverage enhancement methods in wireless sensor networks, a new path coverage enhancement method based on CVT model is proposed in this paper. Firstly, the node perception model and network coverage model are constructed. On the basis of the node awareness model and network coverage model, CVT model is used to adjust the connection mode, density and location of nodes in wireless sensor networks, so as to improve the coverage performance of nodes in the detection area in wireless sensor networks, and realize the effective enhancement of path coverage in wireless sensor networks. Experimental results show that, compared with the traditional methods, the proposed method has high detection probability, high coverage uniformity and coverage rate, and the highest coverage rate reaches 97%, which has higher practical application performance.

关键词： CVT model wireless sensor network node awareness coverage performance

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Maintaining coverage Node Scheduling Algorithm in Wireless Sensor Network 8th

Maintaining Coverage Node Scheduling Algorithm in Wireless S...

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8th China Wireless Sensor Network Conference (CWSN)

作者： Qian, KaiGuo Shen, ShiKai Dai, ZuCheng Duan, Ren Kunming Univ Dept Phys Sci & Technol Kunming Peoples R China Kunming IOT & Ubiquitous Engn Ctr Kunming Peoples R China Kunming Univ Sch Informat & Technol Kunming Peoples R China Future Univ Hakodate Hokkaido Japan Yunnan Univ Finance & Econ Sch Informat Kunming Peoples R China

ISBN: (纸本)9783662469811;9783662469804

Scheduling the redundant nodes to sleep is an effective technology to sufficiently prolong the life circle of wireless sensor network on the premise of meeting the coverage quality. According to position distribution of the neighboring nodes, a node scheduling algorithm of wireless sensor network is proposed on the basis of the necessary condition that a node becomes a redundant one and whether the complementary neighboring nodes meet the circle cover. The new algorithm reduces the computational complexity. Simulation results show that the new algorithm is effective to schedule the redundant node to sleep for energy-saving. It predicates nearly 26 % nodes to sleep when the perception radius is 10 meters and coverage rate is unchanged. It identifies more than 50 % nodes to sleep with 15 meters radius.

关键词： Wireless sensor network Internal-neighbor node Redundant node coverage performance

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Success coverage Probability for Dynamic Resource Allocation in Small Cell Networks

Success Coverage Probability for Dynamic Resource Allocation...

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IEEE Wireless Communications and Networking Conference (WCNC)

作者： Li, Lei Peng, Mugen Yan, Zhipeng Zhao, Zhongyuan Li, Yong Beijing Univ Posts & Telecommun Minist Educ Key Lab Universal Wireless Commun Beijing Peoples R China

ISBN: (纸本)9781467398145

To guarantee the rapidly increasing applications of electrical consumer, ultra small cells have been proposed to provide high spectral efficiency. However, which are severely constrained by the inter-cell interference (ICI) when the system load is high, and the enhanced inter-cell interference coordination (eICIC) is key to improving performance. To quantify the performance gains from eICIC to the load-varied small cells, a stochastic-geometry model is established in this paper, and the successful coverage probability with a dynamic frequency resource allocation (DFRA) scheme adaptive to the varied system load is researched, in which the small cell base station (SCBS) location is modeled as a Poisson point process. The proposed DFRA scheme can decrease ICI through the cooperation of adjacent SCBSs, which results in the correlated spectral usage in adjacent SCBSs. Several approximations are used to handle this kind of correlation, and a Bayesian theory based evaluation method is proposed to derive the asymptotic expression of successful coverage probability. Simulation results show that these approximated expressions match well with the simulated results, and the proposed DFRA can effectively decrease ICI and significantly increase the success coverage probability.

关键词： Stochastic geometry enhanced inter-cell interference coordination coverage performance Bayesian theory

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Satellite Constellation Design with Multi-Objective Genetic Algorithm for Regional Terrestrial Satellite Network

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China Communications 2018年第8期15卷 1-10页

作者： Cuiqin Dai Guimin Zheng Qianbin Chen Chongqing Key Lab of Mobile Communication Technology Chongqing University of Posts and Telecommunications

Constellations design for regional terrestrial-satellite network can strengthen the coverage for incomplete terrestrial cellular network. In this paper, a regional satellite constellation design scheme with multiple feature points and multiple optimization indicators is proposed by comprehensively considering multi-objective optimization and genetic algorithm, and "the Belt and Road" model is presented in the way of dividing over 70 nations into three regular target areas. Following this, we formulate the optimization model and devise a multi-objective genetic algorithm suited for the regional area with the coverage rate under simulating, computing and determining. Meanwhile, the total number of satellites in the constellation is reduced by calculating the ratio of actual coverage of a single-orbit constellation and the area of targets. Moreover, the constellations' performances of the proposed scheme are investigated with the connection of C++ and Satellite Tool Kit(STK). Simulation results show that the designed satellite constellations can achieve a good coverage of the target areas.

关键词： regional terrestrial-satellite net-work constellation design multi-objective optimization genetic algorithm coverage performance

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Modeling and Analysis of Two-Tier HetNets With Cognitive Small Cells

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IEEE ACCESS 2017年 5卷 2904-2912页

作者： Yan, Zhi Zhou, Wentao Chen, Shuang Liu, Hongli Hunan Univ Sch Elect & Informat Engn Changsha 410082 Hunan Peoples R China

Heterogeneous networks (HetNets), which consist of traditional macro-cells overlaid with newly envisioned small cells (e.g., femtocells, picocells, microcells, and nanocells), are conceived as an appealing technology to satisfy the ever-increasing capacity requirements in future mobile networks. The cross-tier interference management is a challenging problem in conventional HetNets due to the large-scale deployment of small cells in random locations, and the lack of complete coordination. However, cognitive HetNets, where small-cell base stations are with cognitive capabilities (e.g., achieved through spectrum sensing), can efficiently overcome the posed challenge. In this paper, considering a two-tier cognitive HetNet, we utilize the statistic tool of stochastic geometry to model and analyze the coverage performance for macro-cell and small-cells over general Nakagami-m fading channels. Specifically, the exact closed form expressions of outage probability for per-tier cell-edge users with and without cognitive interference coordination are derived, respectively. More attractively, the theoretically analytical results can be used to help to design the constraints on the configurations of small cells considering the minimum requirements of coverage performance for macro-cell and small-cell. Simulation results validate our analysis.

关键词： HetNet small cells stochastic geometry cognitive interference management coverage performance

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