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2017 2nd International Conference on Advanced Materials Science and Environment Engineering(AMSEE2017)

作者： Gang HE Yue-jian XIAO Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications

In the context of load balancing [1], Lu et al. proposed a novel class of algorithms called Join-Idle-Queue(JIQ) for distributed load balancing in large systems, where a group of dispatchers distribute jobs to a cluster of parallel servers. Each dispatcher maintains a queue called Idle-Queue for idle servers. When a job arrives to a dispatcher at random, the dispatcher sends it to a server which in the head of the Idle-Queue, or to a random server if the Idle-Queue is empty. Meanwhile conversely,when a server has no jobs, it actively requests to be placed on an Idle-Queue. Although this algorithm was shown to be quite effective [2,3], it is defective in some respects. This paper presents several new improvements, which makes the algorithm more effective, especially in Cloud-based Flow Security system(CFS). These improvements focus primarily on these aspects, such as the definition of idle server, data concurrency while choosing an Idle-Queue, etc. The experimental results show that the improved load balancing algorithm can improve the utilization of resources in a certain extent.

关键词： Cloud computing Load balancing Join-Idle-Queue algorithm Randomized algorithm

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Modeling and Analysis of BS Deployment in Multi-scene Urban Areas

Modeling and Analysis of BS Deployment in Multi-scene Urban ...

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2017 2nd International Conference on Computational Modeling, Simulation and Applied Mathematics（CMSAM 2017)

作者： Rui-qiang MA Mu-qing WU Jian ZHANG Xiu-sheng WAN Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications

With the coming of 5G, the structure of cellular network becomes more and more complex, which provides a great challenge to network modeling. In order to model the real cellular network accurately, researchers proposed many models based on stochastic geometry, such as Strauss process(SP), Poisson hard-core process(PHCP), Thomas cluster process(TCP) and Marten cluster process(MCP). In this paper, we creatively divided the urban areas into three kinds by the indicator of their BS density, which are low-density, middle-density and high-density. Through simulation analysis, we found TCP is more accurate in modeling the low-density city and the middle-density city, while MCP is more accurate in modeling the high-density city.

关键词： Cellular network Base Station(BS) modeling Stochastic geometry

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App Traffic Acquisition and Management on Mobile Terminals in Cloud-based Flow Security system

App Traffic Acquisition and Management on Mobile Terminals i...

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2017 2nd International Conference on Advanced Materials Science and Environment Engineering(AMSEE2017)

作者： Gang HE Chang LIU Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications

With the development of 4 G network and the introduction of the cloud computing, the development of mobile Internet has entered a new area, and the most concerned is the *** of the cloud service providers provide what services, the cloud service will be provided to users through different terminals. This paper will mainly discuss the role of mobile terminals in data security in the cloud service framework and implements capturing the traffic from mobile terminals as well as distinguish the packets collected. This paper also integrates with MITM to deal with SSL packets collected.

关键词： Cloud computing Mobile terminals Collect traffic MITM

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Towards a smart campus: Innovative applications with WiCloud platform based on mobile edge computing

Towards a smart campus: Innovative applications with WiCloud...

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International Conference on Computer Science & Education (ICCSE)

作者： Yaqiong Liu Guochu Shou Yihong Hu Zhigang Guo Hongxing Li Feng Peng Hock Soon Seah Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications Beijing China Beijing Key Laboratory of Network System Architecture and Convergence University of Posts and Telecommunications Beijing Beijing China Nanyang Technological University Singapore

A smart campus refers to a campus where modern information and communication technologies bring more convenience to campus life, assist campus users to improve and more efficiently accomplish their daily activities, and enhance social interactions. Regarding the high demand of services such as mining campus users' semantic information, building augmented reality assisted mobile campus and smart class, we establish an innovative platform, namely, WiCloud, based on Mobile Edge Computing, to provide multiple innovative applications towards a smart campus. We first briefly present the architecture, implementation, and the basic functions of our WiCloud platform. We then elaborate three highly innovative applications, (i) campus users' semantic information analysis, (ii) mobile augmented reality assisted smart campus, and (iii) smart class, that are developed based on WiCloud. Multiple examples of each innovative application demonstrate the innovative applications based on WiCloud perform well and have achieved the goal of benefiting campus users and building a smart campus.

关键词： Mobile communication Servers Cloud computing Semantics Buildings Mobile computing Computer architecture

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A traffic prediction algorithm based on Bayesian spatio-temporal model in cellular network

A traffic prediction algorithm based on Bayesian spatio-temp...

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International Symposium on Wireless Communication systems (ISWCS)

作者： Zhen Zhang Fangfang Liu Zhimin Zeng Wen Zhao Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications Beijing China

5G communication will bring a surge traffic in cellular network. The traffic in cellular network not only has strong variability by time, but also has strong spatio-temporal correlation, which brings large difficulty to predict. In order to make reasonable use of communication network resources, it is important to describe and predict the spatio-temporal information of traffic in cellular network. In this paper, we propose a traffic prediction algorithm based on Bayesian spatio-temporal model to predict the spatial distribution of traffic in cellular network at different moments via realistic traffic data of base stations (BSs). Firstly, we select Gaussian Predictive Process (GPP) as the basic model of the Bayesian spatio-temporal model and set proper prior distribution of the parameters. Secondly, we train the basic model by Gibbs sampling and the realistic traffic data to obtain the posterior distribution of the parameters. Then, we predict the spatio-temporal information of traffic in cellular network by Markov chain Monte Carlo (MCMC) computational techniques. Finally, we make theoretical analysis of prediction accuracy for the prediction results. The Index of Agreement (IA) of the prediction results in three different areas can reach 0.9 above, which indicate good prediction performance. The traffic prediction algorithm can be used to predict the spatio-temporal information of traffic in cellular network in different areas.

关键词： Cellular networks Bayes methods Predictive models Data models Computational modeling Prediction algorithms Correlation

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Energy efficient clustering and beamforming for cooperative multicell networks

Lecture Notes of the Institute for Computer Sciences, Social...

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Lecture Notes of the Institute for Computer Sciences, Social-Informatics and Telecommunications Engineering, LNICST 2017年 174卷 24-33页

作者： Chen, Yawen Wen, Xiangming Lu, Zhaoming Shao, Hua Lu, Jingyu Jing, Wen Peng Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications Beijing China Beijing Laboratory of Advanced Information Networks Beijing China

network densification is the most important way to improve the network capacity and hence is widely adopted to handle the everincreasing mobile traffic demand. However, network densification will make the inter-cell interference severe and also significantly increase the energy budget. Multicell cooperative transmission is an efficient way to mitigate the inter-cell interference and plays an important role in energy efficiency optimization. This paper investigates the energy efficient multicell cooperation strategy for dense wireless networks. Joint cluster forming and beamforming are considered to optimize the energy efficiency (evaluated by bits/Hz/J). The optimization problem is then decoupled into two subproblems, i.e., energy efficient beamforming problem and energy efficient cluster forming problem. The fractional programming and Lagrangian duality theory are used to obtain the optimal beamformer. Coalition formation game theory is exploited to solve the cluster forming problem. The proposed energy efficient clustering and beamforming strategy can provide flexible network service according to spatially uneven traffic and greatly improve the network energy efficiency. © ICST Institute for Computer Sciences, Social Informatics and Telecommunications Engineering 2017.

关键词： Energy efficiency

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Tri-band bpf with six transmission zeros based on quad-mode DGS resonator and MSIR

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Progress In Electromagnetics Research C 2017年 75卷 193-201页

作者： Peng, Biao Li, Shufang Deng, Li Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications Beijing China Beijing Laboratory of Advanced Information Network Beijing University of Posts and Telecommunications Beijing China

This paper presents the comprehensive design and analysis of a tri-band bandpass filter (BPF) based on a novel quad-mode defected ground structure resonator (QMDGSR) fed by two 50 Ω microstrip lines under the source-load coupling condition. Four transmission zeros (TZs) are produced in the proposed tri-band bandpass structure with two TZs beside each passband. All the four TZs are thoroughly analysed using equivalent circuit models based on the even-/odd-mode theory, and the corresponding equation for extracting the frequency of each TZ is developed and verified. The bandwidths (BWs) of the 1st and 3rd operating bands are broadened by incorporating the proposed tri-band bandpass structure with a traditional microstrip stepped impedance resonator (MSIR). Also, two additional TZs are generated due to the coupling between the feeding lines and the newly incorporated MSIR, which significantly result in the passband selectivity improvement. The lower and upper stopband rejections of the fabricated prototype are as high as 83.3 and 43.9 dB, respectively. © 2017, Electromagnetics Academy. All rights reserved.

关键词： Defected ground structures

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Scheduling of Security Resources in Software Defined Security architecture

Scheduling of Security Resources in Software Defined Securit...

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第九届网络分布式计算与知识发现国际会议( 2017 International Conference on Cyber-enabled distributed computing and knowledge discovery)

作者： Gang Zhang Xiaofeng Qiu Wei Chang Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and TelecommunicationsBeijing 100876China

With the development of Software Defined networking,its software programmability and openness brings new idea for network ***,many Software Defined Security architectures emerged at the right *** Defined Security decouples security control plane and security data *** Software Defined Security architectures,underlying security devices are abstracted as security resources in resource pool,intellectualized and automated security business management and orchestration can be realized through software programming in security control ***,network management has been becoming extremely complicated due to expansible network scale,varying network devices,lack of abstraction and heterogeneity of network ***,new-type open security devices are needed in SDS architecture for unified management so that they can be conveniently abstracted as security resources in resource *** paper firstly analyses why open security devices are needed in SDS architecture and proposes a method of opening security *** this new architecture requires a new security scheduling mechanism,this paper proposes a security resource scheduling algorithm which is used for managing and scheduling security resources in resource pool according to user's security *** security resource scheduling algorithm aims to allocate a security protection task to a suitable security resource in resource pool so that improving security protection *** the algorithm,we use BP neural network to predict the execution time of security tasks to improve the performance of the *** simulation result shows that the algorithm has ideal ***,a usage scenario is given to illustrate the role of security resource scheduling in software defined security architecture.

关键词： open security devices security resources scheduling software dejined security security task abstracting security resource capability abstracting

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SWN: An SDN Based Framework for Carrier Grade WiFi networks

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China Communications 2016年第3期13卷 12-26页

作者： LEI Tao WEN Xiangming LU Zhaoming ZHAO Xing LI Yangchun ZHANG Biao Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications Beijing Laboratory of Advanced Information Networks Beijing University of Posts and Telecommunications

With the rapid growth of mobile data traffic and vast traffic offloaded from cellular network, Wi-Fi has been considered as an essential component to cope with the tremendous growth of mobile data traffic. Although operators have deployed a lot of carrier grade Wi-Fi networks, but there are still a multitude of arrears for nowadays Wi-Fi networks, such as supporting seamless handover between APs, automatic network access and unified authentication, etc. In this paper, we propose an SDN based carrier grade Wi-Fi network framework, namely SWN. The key conceptual contribution of SWN is a principled refactoring of Wi-Fi networks into control and data planes. The control plane has a centralized global view of the whole network, can perceive the underlying network state by network situation awareness(NAS) technique, and bundles the perceived information and network management operations into northbound Application Programming Interface(API) for upper applications. In the data plane, we construct software access point(SAP) to abstract the connection between user equipment(UE) and access point(AP). network operators can design network applications by utilizing these APIs and the SAP abstraction to configure and manage the whole network, which makes carrier grade Wi-Fi networks more flexible, user-friendly, and scalable.

关键词： SWN carrier grade Wi-Finet works SDN seamless handover load balancing Hotspot 2.0 traffic offloading

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Reduced frame set on wireless distorted video for quality assessment

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The Journal of China Universities of Posts and Telecommunications 2016年第4期23卷 77-82,100页

作者： Shao Hua Wen Xiangming Lu Zhaoming Chen Yawen Lu Jingyu Beijing Laboratory of Advanced Information Networks Beijing University of Posts and Telecommunications Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications

Objective video quality assessment methods often evaluate all the frames regardless of their importance. For wireless distorted videos, not every frame has the same contribution to the final overall quality due to the channel fading and interference, which may lead to the capacity variation in temporal. Besides, with the content similarity and error propagation pattern in temporal domain, it is possible to evaluate the overall quality with only part of the frames. In this paper, a demonstration is performed to show that the video quality can be evaluated with reduced frames set（RFS）, and a state transition model is proposed to extract the RFS. At last, a video quality assessment（VQA） method is carried out based on RFS. Compared with several state-of-the-art methods, our method can achieve a suitable accuracy with less frames to be processed.

关键词： VQA wireless distortion quality of experience

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