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7th IET International Conference on wireless, Mobile and Multimedia networks, ICWMMN 2017

作者： Hu, Han Wang, Hong Yang, Jie Pan, Ziyu Jiangsu Key Lab of Wireless Communications Key Lab on Wideband Wireless Communications and Sensor Network Technology of Ministry of Education Nanjing University of Posts and Telecommunications Jiangsu Nanjing210003 China Communication Engineering Department Nanjing Institute of Technology Jiangsu Nanjing211167 China

ISBN: (纸本)9781785615153

In this paper, an analytical framework is developed to evaluate the uplink outage and spatial blocking performance in a multichannel heterogeneous cellular network. A weighted uplink cell association criterion and random channel reuse scheme are integrated in the considered model. The spatial locations of base stations (BSs) per tier as well as the users (UEs) are modelled as independent Poisson point processes. Because of the maximum transmit power constraint, a UE is allowed to communicate with its serving BS only when it has sufficient transmit power to support full channel inversion. With the aid of stochastic geometry, uplink spatial blocking and outage probability are respectively derived, which are validated to be quite close to the true distributions by extensive simulations. Thus, the theoretical analysis developed in this paper is valid. Then, the effect of network parameters, such as weighted factor, power cut-off threshold, and channel reuse factor, can be evaluated by quickly closed-form expressions rather than error-prone system-level simulations. © Institution of Engineering and technology. All rights reserved.

关键词： Outages

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Outage Performance of Satellite-Aerial-Terrestrial network

Outage Performance of Satellite-Aerial-Terrestrial Network

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IEEE Globecom Workshops

作者： Qingquan Huang Min Lin Jun-Bo Wang Wei-Ping Zhu Communications Engineering College Army Engineering University of PLA Nanjing China The 63rd Research Institute National University of Defense Technology Nanjing China Key Lab of Broadband Wireless Communication and Sensor Network Technology Ministry of Education Nanjing University of Posts and Telecommunications Nanjing China National Mobile Communications Research Laboratory Southeast University Nanjing China Department of Electrical and Computer Engineering Concordia University Montreal Canada School of Communication and Information Engineering Nanjing University of Posts and Telecommunications Nanjing China

ISBN: (数字)9781728109602

ISBN: (纸本)9781728109619

In this paper, we investigate the performance of an amplify-and-forward satellite-aerial-terrestrial network (SATN) with a multi-antenna unmanned aerial vehicle (UAV) relay, where the satellite-UAV link undergoes correlated Shadowed-Rician fading while the UAV-terrestrial links experience correlated Rician fading, respectively. Specifically, we first formulate a constrained optimization problem in terms of maximizing the system capacity to obtain the beamforming (BF) weight vectors at the UAV. By assuming that perfect channel state information (CSI) is unavailable, we design statistical CSI-aided BF scheme to enhance the system performance. Then, with the help of probability theory, we obtain the closed-form expression of outage probability for the considered SATN. Simulation results are provided to validate the effectiveness of our proposed BF scheme and the correctness of the derived expressions.

关键词： Satellites Unmanned aerial vehicles Relays Antenna arrays Signal to noise ratio wireless communication Optimization

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Multi-radio access based bandwidth allocation strategy for video communication in heterogeneous wireless networks

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The Journal of China Universities of Posts and Telecommunications 2016年第2期23卷 6-14页

作者： Zhu Xuewen Zhu Qi Jiangsu Key Laboratory of Wireless Communications Nanjing University of Posts and Telecommunications Key Laboratory on Wideband Wireless Communications and Sensor Network Technology Nanjing University of Posts and Telecommunications

In order to make full use of the radio resource of heterogeneous wireless networks（HWNs） and promote the quality of service（Qo S） of multi-homing users for video communication, a bandwidth allocation algorithm based on multi-radio access is proposed in this paper. The proposed algorithm adopts an improved distributed common radio resource management（DCRRM） model which can reduce the signaling overhead sufficiently. This scheme can be divided into two phases. In the first phase, candidate network set of each user is obtained according to the received signal strength（RSS）. And the simple additive weighted（SAW） method is employed to determine the active network set. In the second phase, the utility optimization problem is formulated by linear combining of the video communication satisfaction model, cost model and energy efficiency model. And finding the optimal bandwidth allocation scheme with Lagrange multiplier method and Karush-Kuhn-Tucker（KKT） conditions. Simulation results show that the proposed algorithm promotes the network load performances and guarantees that users obtain the best joint utility under current situation.

关键词： video communication heterogeneous wireless networks joint utility energy efficiency radio resource management

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Closed-form interference alignment with heterogeneous degrees of freedom

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High technology Letters 2017年第2期23卷 173-178页

作者：杨秀梅 Wang Jiang Wang Rui Zhou Ting Key Laboratory of Wireless Sensor Network & Communication Shanghai Institute of Microsystem and Information Technology Chinese Academy of Sciences Shanghai 200050 P. R. China Shanghai Research Center for Wireless Communications Shanghai 201210 P. R. China

Interference alignment(IA) has been recognized as a promising technique for obtaining the optimal degrees of freedom(DOF) in interference networks.A closed-form interference alignment design is proposed for three-cell uplink transmissions with heterogeneous *** exploiting the heterogeneity of DOFs from different transmission links,full or partial interference alignment precoders are calculated at each base station(BS).Aided by information exchange among BSs,the precoders can be finally obtained for all transmission *** to existing IA methods,the proposed scheme has a closed-form ***,there is no need to go through the iterative adaptation or jointly calculate the precoder and the *** results show that the proposed design is able to achieve the optimal DOF performance with the advantage of perfect alignment capabilities.

关键词： interference alignment(IA) heterogeneous DOFs precoder design

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Uplink Performance Analysis in Multi-Tier Heterogeneous Cellular networks with Power Control and Biased User Association

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China communications 2016年第12期13卷 25-36页

作者： Han Hu Hong Wang Qi Zhu Ziyu Pan Jiangsu Key Lab of Wireless Communications Key Lab on Wideband Wireless Communications and Sensor Network Technology of Ministry of EducationNanjing University of Posts and Telecommunications

A K-tier uplink heterogeneous cellular network is modelled and analysed by accounting for both truncated channel inversion power control and biased user association. Each user has a maximum transmit power constraint and transmits data when it has sufficient transmit power to perform channel inversion. With biased user association, each user is associated with a base station(BS) that provides the maximum received power weighted by a bias factor, but not their nearest BS. Stochastic geometry is used to evaluate the performances of the proposed system model in terms of the outage probability and ergodic rate for each tier as functions of the biased and power control parameters. Simulations validate our analytical derivations. Numerical results show that there exists a trade-off introduced by the power cut-off threshold and the maximum user transmit power constraint. When the maximum user transmit power becomes a binding constraint, the overall performance is independent of BS densities. In addition, we have shown that it is beneficial for the outage and rate performances by optimizing different network parameters such as the power cut-off threshold as well as the biased factors.

关键词： Heterogeneous cellular network uplink performance biased user association stochastic geometry

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Time-Efficient Power Allocation Scheme for Two-Way Multi-relay Cognitive Radio networks

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Chinese Journal of Electronics 2016年第2期25卷 357-363页

作者： ZHOU Zhikang ZHU Qi The Key Wireless Lab of Jiangsu Province School of Telecommunication and Information EngineeringNanjing University of Posts and Telecommunications Key Lab on Wideband Wireless Communications and Sensor Network Technology of Ministry of Education

Cooperative relaying has been emerging as a key technology in Cognitive radio(CR) networks. A two-way Amplify-and-forward(AF) based multi-relay CR network is considered, where a primary user coexists with a pair of secondary users and multiple relays. A Timeefficient sub-optimal power allocation scheme(TESOPA)based on Cauchy-Schwarz inequality is provided to maximize the total end-to-end transmission rate of the secondary system. TESOPA is proposed under maximal transmission power constraints, while ensuring the quality of service of the primary user during the whole communication process. The computational complexity is sharply decreased by using the Cauchy-Schwarz inequality. Simulation results show that the proposed TESOPA scheme performs very close to the near-optimal Interior point method based power allocation(IPMPA), especially in interference dominant networks where interference constraints play a key role in determining power allocation results instead of maximal transmission power constraints.

关键词： Power allocation Relay network Cognitive radio Amplify-and-forward Two-way communication

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Distributed Edge Caching in Ultra-dense Fog Radio Access networks: A Mean Field Approach

Distributed Edge Caching in Ultra-dense Fog Radio Access Net...

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IEEE Vehicular technology Conference

作者： Yabai Hu Yanxiang Jiang Mehdi Bennis Fu-Chun Zheng Shanghai Institute of Microsystem and Information Technology Chinese Academy of Sciences Key Laboratory of Wireless Sensor Network & Communication 865 Changning Road Shanghai 200050 China University of Oulu Centre for Wireless Communications Oulu 90014 Finland Harbin Institute of Technology School of Electronic and Information Engineering Shenzhen 518055 China

ISBN: (纸本)9781538663592;9781538663585

In this paper, the edge caching problem in ultra-dense fog radio access networks (F-RAN) is investigated. Taking into account time-variant user requests and ultra-dense deployment of fog access points (F-APs), we propose a dynamic distributed edge caching scheme to jointly minimize the request service delay and fronthaul traffic load. Considering the interactive relationship among F-APs, we model the caching optimization problem as a stochastic differential game (SDG) which captures the temporal dynamics of F-AP states and incorporates user requests status. The SDG is further approximated as a mean field game (MFG) by exploiting the ultra-dense property of F-RAN. In the MFG, each F-AP can optimize its caching policy independently through iteratively solving the corresponding partial differential equations without any information exchange with other F-APs. The simulation results show that the proposed edge caching scheme outperforms the baseline schemes under both static and time-variant user requests.

关键词： cache storage differential games optimisation partial differential equations radio access networks stochastic processes telecommunication traffic wireless networks differential games cache storage telecommunication traffic Markov chain Cache memory information exchange Differential equations NEBULISED fog fogs Partial differential equations

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Distributed edge caching in ultra-dense fog radio access networks: A mean field approach

arXiv

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arXiv 2018年

作者： Hu, Yabai Jiang, Yanxiang Bennis, Mehdi Zheng, Fu-Chun National Mobile Communications Research Laboratory Southeast University Nanjing210096 China State Key Laboratory of Integrated Services Networks Xidian University Xi'an710071 China Key Laboratory of Wireless Sensor Network & Communication Shanghai Institute of Microsystem and Information Technology Chinese Academy of Sciences Shanghai200050 China Centre for Wireless Communications University of Oulu Oulu90014 Finland School of Electronic and Information Engineering Harbin Institute of Technology Shenzhen518055 China National Mobile Communications Research Laboratory Southeast University Nanjing210096 China

In this paper, the edge caching problem in ultra-dense fog radio access networks (F-RAN) is investigated. Taking into account time-variant user requests and ultra-dense deployment of fog access points (F-APs), we propose a dynamic distributed edge caching scheme to jointly minimize the request service delay and fronthaul traffic load. Considering the interactive relationship among F-APs, we model the caching optimization problem as a stochastic differential game (SDG) which captures the temporal dynamics of F-AP states and incorporates user requests status. The SDG is further approximated as a mean field game (MFG) by exploiting the ultra-dense property of FRAN. In the MFG, each F-AP can optimize its caching policy independently through iteratively solving the corresponding partial differential equations without any information exchange with other F-APs. The simulation results show that the proposed edge caching scheme outperforms the baseline schemes under both static and time-variant user requests. Copyright © 2018, The Authors. All rights reserved.

关键词： Fog

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Power control via stackelberg game for small-cell networks

arXiv

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arXiv 2018年

作者： Jiang, Yanxiang Ge, Hui Bennis, Mehdi Zheng, Fu-Chun You, Xiaohu National Mobile Communications Research Laboratory Southeast University Nanjing210096 China State Key Laboratory of Integrated Services Networks Xidian University Xi’an710071 China Key Laboratory of Wireless Sensor Network & Communication Shanghai Institute of Microsystem and Information Technology Chinese Academy of Sciences Shanghai200050 China National Mobile Communications Research Laboratory Southeast University Nanjing210096 China Centre for Wireless Communications University of Oulu Oulu90014 Finland School of Electronic and Information Engineering Harbin Institute of Technology Shenzhen518055 China

In this paper, power control in the uplink for two-tier small-cell networks is investigated. We formulate the power control problem as a Stackelberg game, where the macrocell user equipment (MUE) acts as the leader and the small-cell user equipment (SUEs) act as the followers. To reduce the cross-tier and co-tier interferences and the power consumptions of both the MUE and SUEs, we propose optimizing not only the transmit rate but also the transmit power. The corresponding optimization problems are solved through a two-layer iteration. In the inner iteration, the SUEs compete with each other, and their optimal transmit powers are obtained through iterative computations. In the outer iteration, the optimal transmit power of the MUE is obtained in a closed form based on the transmit powers of the SUEs through proper mathematical manipulations. We prove the convergence of the proposed power control scheme, and we also theoretically show the existence and uniqueness of the Stackelberg equilibrium (SE) in the formulated Stackelberg game. The simulation results show that the proposed power control scheme provides considerable improvements, particularly for the MUE. Copyright © 2018, The Authors. All rights reserved.

关键词： Power control

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A hardware-efficient hybrid beamforming solution for mmwave MIMO systems

arXiv

引用

arXiv 2018年

作者： Li, Ming Wang, Zihuang Li, Hongyu Liu, Qian Zhou, Liang School of Information and Communication Engineering Dalian University of Technology DalianLiaoning116024 China School of Computer Science and Technology Dalian University of Technology Dalian Liaoning116024 China Key Laboratory of Broadband Wireless Communications and Sensor Network Technology Ministry of Education Nanjing University of Posts and Telecommunications Nanjing210003 China

In millimeter wave (mmWave) communication systems, existing hybrid beamforming solutions generally require a large number of high-resolution phase shifters (PSs) to realize analog beamformers, which still suffer from high hardware complexity and power consumption. Targeting at this problem, this article introduces a novel hardware-efficient hybrid precoding/combining architecture, which only employs a limited number of simple phase over-samplers (POSs) and a switch (SW) network to achieve maximum hardware efficiency while maintaining satisfactory spectral efficiency performance. The POS can be realized by a simple circuit and simultaneously outputs several parallel signals with different phases. With the aid of a simple switch network, the analog precoder/combiner is implemented by feeding the signals with appropriate phases to antenna arrays or RF chains. We analyze the design challenges of this POS-SW-based hybrid beamforming architecture and present potential solutions to the fundamental issues, especially the precoder/combiner design and the channel estimation strategy. Simulation results demonstrate that this hardware-efficient structure can achieve comparable spectral efficiency but much higher energy efficiency than that of the traditional structures. Copyright © 2018, The Authors. All rights reserved.

关键词： Phase shifters

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