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coverage performance of UAV-Assisted SWIPT Networks With Directional Antennas

IEEE INTERNET OF THINGS JOURNAL 2022年第13期9卷 10600-10609页

作者： Jiang, Ruihong Xiong, Ke Yang, Hong-Chuan Cao, Jie Zhong, Zhangdui Ai, Bo Beijing Jiaotong Univ Sch Comp & Informat Technol Beijing 100044 Peoples R China Beijing Jiaotong Univ Beijing Key Lab Traff Data Anal & Min Beijing 100044 Peoples R China Univ Victoria Dept Elect & Comp Engn Victoria BC V8W 2Y2 Canada Nanjing Univ Finance & Econ Jiangsu Prov Key Lab E Business Nanjing 210023 Peoples R China Nanjing Univ Sci & Technol Sch Comp Sci & Engn Nanjing 210094 Peoples R China Beijing Jiaotong Univ State Key Lab Rail Traff Control & Safety Beijing Peoples R China Beijing Jiaotong Univ Beijing Engn Res Ctr High Speed Railway Broadband Beijing Peoples R China

This article studies the coverage performance of unmanned aerial vehicle (UAV)-assisted simultaneous wireless information and power transfer (SWIPT) networks under the nonlinear and linear energy harvesting (EH) models in the rich scattering scenarios, including smart farming and smart ranching, where the None-Line-of-Sight (NLoS) links are the dominate component of the wireless channel. Multiple UAVs are equipped with directional antennas to transfer information and energy to ground users (GUs). Power splitting (PS) or time switching (TS) architecture is employed at GUs. In order to evaluate the system performance in fading channels, the information and energy coverage probabilities of the system are discussed, and by using the stochastic geometry approach and the approximate scaling method, the general and lower bound explicit expressions of the coverage probabilities are derived. Numerical results show that the coverage performance of PS-based systems is superior to that of TS-based systems. Moreover, although the linear EH model yields better results than the nonlinear one, as the linear EH model is too ideal, its yielded results may mismatch practical EH circuits, and the ones yielded by the nonlinear EH model is much closer to practice, as the nonlinear EH model is based on real data measurement. Additionally, the nonlinear EH model has a relatively small effect on the harvested energy coverage probability, and the linear EH model introduces greater bias for the TS-based system than that for PS-based one.

关键词： Wireless communication Fading channels Wireless sensor networks Integrated circuit modeling Data models Base stations Sensors coverage performance energy harvesting (EH) nonlinear EH model simultaneous wireless information and power transfer (SWIPT) stochastic geometry

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coverage performance of the Terrestrial-UAV HetNet Utilizing Licensed and Unlicensed Spectrum Bands

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IEEE ACCESS 2021年 9卷 124100-124114页

作者： Jiang, Yifan Fei, Zesong Guo, Jing Cui, Qimei Beijing Inst Technol Sch Informat & Elect Beijing 100081 Peoples R China Beijing Univ Posts & Telecommun Natl Engn Lab Mobile Network Technol Beijing 100876 Peoples R China

To address the spectrum shortage issue, the technology of sharing the unlicensed spectrum resource has been developed for terrestrial wireless networks, e.g., the New Radio Unlicensed technology. Recently, due to the limitation of terrestrial wireless networks, unmanned aerial vehicles (UAVs) have been proposed to improve the coverage for users. Hence, the combination of the unlicensed spectrum band technology and the UAV communication can fulfill the requirements of offering 3-D coverage while improving the spectrum efficiency. In this paper, we investigate the terrestrial and UAV heterogeneous network (HetNet), where both the terrestrial base stations and aerial base stations implement the random mode selection procedure to use either the licensed or unlicensed spectrum band. Based on stochastic geometry, we develop a tractable mathematical framework to characterize the medium access probability and the overall coverage probability. The accuracy of the analytical evaluations is validated by simulations. Our results show that the incorporation of the licensed and unlicensed spectrum band by using the mode selection scheme can improve the overall network performance, compared with the performance of the 3-D HetNet operating in the licensed spectrum band only. Furthermore, mode selection of the aerial network plays the dominant role in improving the overall coverage probability, and the mode selection probability (i.e., the probability of switching to use the unlicensed spectrum band) has to be selected carefully to maximize the overall coverage probability.

关键词： Unmanned aerial vehicles Resource management Interference Fading channels Cellular networks Base stations Wireless networks Unlicensed spectrum unmanned aerial vehicle HetNet poisson point process coverage performance

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coverage performance analysis of multi-camera networks based on observing reliability model

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OPTIK 2014年第10期125卷 2220-2224页

作者： Sun, Qian Xu, Dong Wu, Zhong Cao, Wenyuan Beihang Univ Sch Instrumentat Sci & Optoelect Engn Beijing 100191 Peoples R China

coverage control is a fundamental problem in sensor networks, which has been explored thoroughly based on a traditional scalar sensing model. However, camera sensors are different from traditional scalar sensors as different cameras from different positions can form distinct views of the target. Hence, Target size and geometric structure of camera nodes can greatly influence the surveillance ability of a camera network. In view of this, a novel observation reliability model of a camera network is proposed, and relationship between surveillance ability and observing reliability for the target is studied. On the basis, a camera network coverage model which considers about obstacles and interesting area of the environment is investigated, and optimized by dynamic planning method. Simulation results show that our method can effectively improve the target capture rate of the network and also we can observe the target from a better view. (c) 2013 Elsevier GmbH. All rights reserved.

关键词： Multi-camera networks coverage performance Camera model Observing reliability model Capture rate

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coverage performance Analysis of Backhaul-Limited UAV-Assisted Cellular Networks

Coverage Performance Analysis of Backhaul-Limited UAV-Assist...

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IEEE International Conference on Communications (IEEE ICC)

作者： Zhu, Qiangfeng Zheng, Jun Southeast Univ Natl Mobile Commun Res Lab Sch Informat Sci & Engn Frontiers Sci Ctr Mobile Informat Commun & Secur Nanjing 210096 Peoples R China Purple Mt Labs Nanjing 211111 Peoples R China

ISBN: (纸本)9781538674628

This paper analyzes the coverage performance of a backhaul-limited UBS-assisted cellular network and focuses on the downlink coverage probability of the network, taking into account the effects of both access links and backhaul links. Based on stochastic geometry, a theoretical model is derived to build the relationship between the downlink coverage probability and relevant system parameters. In deriving the model, the distributions of UAV base stations (UBSs) and macro- base stations (MBSs) are modeled as two independent Poisson point processes (PPPs). For access links and backhaul links, both line-of-sight (LoS) links and non-line-of-sight (NLoS) links are considered. Moreover, an association strategy in which a user selects a BS providing the largest average received power for connection is considered. The derived theoretical model is validated through simulation results. Based on numerical results, the impacts of relevant system parameters and UAV parameters on the coverage probability of the network are investigated. The results indicate that backhaul links have a big impact on the coverage performance of the network and are expected to be guaranteed. Moreover, the derived theoretical model can be used to provide a theoretical basis for the deployment of UBSs

关键词： UAV UBS coverage performance backhaul link cellular network

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coverage performance Analysis of Grid Distribution in Heterogeneous Network 17

Coverage Performance Analysis of Grid Distribution in Hetero...

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IEEE 17th International Conference on Communication Technology (ICCT)

作者： Sui, Xueming Zhang, Hui Lv, Yuanhong Nankai Univ Key Lab Optoelect Sensor & Sensing Network Techno Tianjin Peoples R China

ISBN: (纸本)9781509039449

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 above-mentioned 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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Dynamic coverage performance of wind-assisted balloons mesh based on Voronoi partition and energy constraint

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ADVANCES IN SPACE RESEARCH 2022年第2期70卷 470-484页

作者： Du, Huafei Sun, Tianfang Lv, Mingyun Junhui, Meng Zhang, Zhenlin Beihang Univ Sch Aeronaut Sci & Engn Beijing 100191 Peoples R China Beijing Inst Technol Sch Aerosp Engn Beijing 100081 Peoples R China North Automat Control Technol Inst Taiyuan 030006 Shanxi Peoples R China

Efficiently navigating a fleet of several thousand high-altitude balloons to provide communication network and information system to the entire Earth is a promising technology. Here we proposed the use of balloons with altitude control system to coverage the entire Earth by exploiting the natural time-varying wind field. The energy constraints are deduced based on the energy collectingconsuming model and the energy management strategy of the wind-assisted balloon. The Voronoi partition is introduced to optimize the configuration. Then a dynamic coverage algorithm for multi-balloons system is developed. Three schemes of 1500 balloons in two launch sites are simulated to show the effectiveness of the algorithm. The results demonstrate that Voronoi partition with energy constraints is an effective solution to spread the wind-assisted balloons out over the entire Earth within a short time and then maintain the optimal dynamic coverage configuration for quite a long time. This can serve as a guideline for the design and flight test of the serviceable wind-assisted balloons coverage mesh. (c) 2022 COSPAR. Published by Elsevier B.V. All rights reserved.

关键词： Altitude control system coverage performance Energy constraint Voronoi partition Wind-assisted balloon

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Energy-Efficiency Study for Two-tier Heterogeneous Networks (HetNet) Under coverage performance Constraints

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MOBILE NETWORKS & APPLICATIONS 2013年第4期18卷 567-577页

作者： Zhang, Xing Su, Zhuowen Yan, Zhi Wang, Wenbo Beijing Univ Posts & Telecommun Key Lab Universal Wireless Commun Wireless Signal Proc & Network Lab Minist Educ Beijing 100876 Peoples R China

Recently, heterogeneous networks (HetNet) have been widely studied as an effective approach to provide high network capacity and coverage, which jointly utilizes the technologies of cognitive radio and cooperative communications. However, the dense and random deployment of small-cells (e.g., micro, pico and femtocells) raises important questions about the energy consumption for HetNets. In this paper, we study the optimal energy efficiency of a two-tier heterogeneous network consists of a macro-cell and many small-cells under coverage performance constraints for different spectrum deployments (including orthogonal and co-channel spectrum deployments). Firstly, we derive the closed-form expressions of coverage performance for each tier based on stochastic geometry. Then the relationship between energy efficiency and the density of small-cells for the two-tier network is evaluated, the optimal density of small-cells that maximize energy efficiency under coverage performance constraints for the two-tier network is obtained. The theoretical analysis is validated by *** results show that the energy efficiency of the two-tier networks with orthogonal spectrum deployment is better than that with co-channel spectrum deployment. The results also show that the optimal density of small-cells for maximal energy efficiency is only dependent on the coverage performance of small-cells in orthogonal spectrum deployment scenario. However, in co-channel spectrum deployment scenario, the optimal density of small-cells for maximal energy efficiency is jointly decided by the coverage performance of both macro-cell and small-cell. This work provides an essential understanding for successful deployment of green heterogeneous networks.

关键词： Energy-efficiency Two-tier networks Heterogeneous networks (HetNet) coverage performance

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Antenna Deployment Optimization for coverage performance Improvement in High-Speed Railway Communications

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IEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS 2024年第10期23卷 2929-2933页

作者： Li, Nan Dong, Jia Shao, Zhe Cao, Jingyang Li, Hao Ding, Haiyu Beijing Univ Posts & Telecommun Sch Informat & Commun Engn Beijing 100876 Peoples R China China Mobile Res Inst Beijing 100053 Peoples R China China Mobile Commun Grp Co Ltd Beijing 100032 Peoples R China

This letter presents a low-cost antenna deployment optimization method for the coverage performance improvement in high-speed railway (HSR) communications. The installation status of the base station antenna is optimized to realize the best projection of the antenna gain pattern on the line-type coverage area for the railway dedicated network. Detailed analysis of the optimized antenna deployment is conducted for different range of the engineering parameters of the sites. Moreover, a simplified deployment method is presented and verified, suitable for both the discrete antenna with a flexible azimuth angle and integrated antennas with a fixed included angle. The field test is carried out to validate the superior coverage performance of the proposed antenna deployment solution in comparison with traditional antenna solutions.

关键词： Antennas Rail transportation Base stations Azimuth Array signal processing Directive antennas Antenna arrays Antenna deployment antenna gain pattern base station (BS) antenna coverage performance energy projection efficiency ground projection high-speed railway (HSR) communications

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coverage performance of the multilayer UAV-terrestrial HetNet with CoMP transmission scheme

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Frontiers of Information Technology & Electronic Engineering 2022年第1期23卷 61-72页

作者： Weihao WANG Yifan JIANG Zesong FEI Jing GUO School of Information and Electronics Beijing Institute of TechnologyBeijing100081China

To support the ubiquitous connectivity requirement of sixth generation communication,unmanned aerial vehicles(UAVs)play a key role as a major part of the future communication *** major issue in UAV communications is the interference resulting from spectrum sharing and line-of-sight ***,the application of the coordinated multipoint(CoMP)technology has been proposed to reduce the interference in the UAV-terrestrial heterogeneous network(HetNet).In this paper,we consider a three-dimensional(3D)multilayer UAV-terrestrial HetNet,where the aerial base stations(ABSs)are deployed at multiple different *** stochastic geometry,we develop a tractable mathematical framework to characterize the aggregate interference and evaluate the coverage probability of this *** numerical results show that the implementation of the CoMP scheme can effectively reduce the interference in the network,especially when the density of base stations is relatively ***,the system parameters of the ABSs deployed at higher altitudes dominantly influence the coverage performance of the considered 3D HetNet.

关键词： Unmanned aerial vehicle Poisson point process Coordinated multipoint(CoMP) Statistics of interference coverage performance

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A Study on coverage performance for LTE-FDD System and Comparison with WCDMA System

A Study on Coverage Performance for LTE-FDD System and Compa...

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International Conference on Information Technology and Applications (ITA)

作者： Xu, Jun Pei, Yushan Zhou, Fei Zhang, Yaoxu Lv, Zhaobiao China Unicom Network Technol Res Inst Beijing Peoples R China China United Network Telecommun Corp Ltd Guangdong Branch Beijing Peoples R China

ISBN: (纸本)9781479928767

whenever new cellular technology is considered for mass deployment hundreds of its RF parameters go through tuning process with a view to find out optimum value. And usually, it costs a lot of time and money. Consequently, extensive simulation becomes meaningful before commercial deployment. System can be facilitated in numerous ways and cost would be greatly minimized With the path loss and propagation model, the radius of the site, the sites spacing and the coverage area of the site can be calculated. The system characteristics of LTE FDD and the link budgets for LTE FDD and WCDMA are calculated in this paper.

关键词： link budget LTE WCDMA coverage performance

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