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The research on network traffic modeling based on chaotic time series

Journal of Computational Information Systems 2012年第8期8卷 3323-3330页

作者： Yin, Ansheng Zhang, Shunyi Qi, Jin Key Lab. of Broadband Wireless Communication and Sensor Network Technology Nanjing University of Posts and Telecommunications Ministry of Education Nanjing 210003 China Institute of Information and Network Technology Nanjing University of Posts and Telecommunication No. 66 Xin Mofan Road Nanjing 210003 China

Spurred by the need of network monitoring and security, network traffic modeling is a much discussed research topic. However, the classical Markov flow model is no longer suitable for packet-switched network because of such network properties as self-similarity and long-range dependence. This paper presents a network traffic model based on chaotic time series which can predict the network traffic with smaller error than other models through experiments. © 2012 Binary Information Press.

关键词： Packet switching

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Differential space-time block coding based cooperative spectrum sensing over fading environments in cognitive radio sensor networks

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Journal of Information and Computational Science 2012年第15期9卷 4599-4606页

作者： Chen, Zhi Yue, Wenjing College of Computer Nanjing University of Posts and Telecommunications Nanjing 210003 China Key Laboratory for Novel Software Technology Nanjing University Nanjing 210093 China Jiangsu High Technology Research Key Laboratory for Wireless Sensor Networks Nanjing 210003 China Key Lab. of Broadband Wireless Communication and Sensor Network Technology Nanjing University of Posts and Telecommunications Ministry of Education Nanjing 210003 China

Incorporating cognitive radio capability in recource-constrainted multihop wireless sensor networks may help realize the deployment of multiple overlaid sensor networks, and eliminate collision and excessive contention delay incurred by dense node deployment. One of the main requirements of cognitive radio sensor networks is the ability to detect the presence of the primary user with fast speed and high accuracy in wireless environments. Cooperative spectrum sensing emerges as a promising candidate to meet these requirements. In practice, however, since the local sensing observations are forwarded to a sink through fading channels, the sensing performance of cooperative spectrum sensing is deteriorated due to the reporting errors introduced by the fading channels. To deal with this limitation, we propose a differential space-time block coding based cooperative spectrum sensing scheme to improve the sensing performance by decreasing the probability of reporting error. The sensing performance is also derived. Numerical results verify that better sensing performance can be achieved in proposed scheme compared to the conventional cooperative spectrum sensing. © 2012 by Binary Information Press.

关键词： Cognitive radio

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A free-rider forecasting model based on gray system theory in P2P networks

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Research Journal of Applied Sciences, Engineering and technology 2012年第21期4卷 4423-4428页

作者： Xu, He Zhou, Zhao-Xiong Wang, Suo-Ping Wang, Ru-Chuan College of Computer Nanjing University of Posts and Telecommunications Nanjing 210003 China College of Automation Jiangsu Nanjing 210003 China Jiangsu High Technology Research Key Laboratory for Wireless Sensor Networks Jiangsu Nanjing 210003 China Key Lab of Broadband Wireless Communication and Sensor Network Technology Nanjing University of Posts and Telecommunications Ministry of Education Jiangsu Province Nanjing 210003 China

The aim of this study is to forecast the number of free-riders in P2P networks which can help network managers to know the status of the networks in advance and take appropriate measures to cope with free-riding behavior. Free-riding behavior is common in P2P networks, which has a negative impact on the robustness, availability and stability of the networks. Severe free-riding behavior may lead to the crash of the whole P2P application system. Based on the research of free-riding behavior in P2P networks, this paper constructs a free-rider forecasting model (GST model) using Gray System Theory. Simulation experiments show that this model has high feasibility, and can carry out reasonable predictions on the number of free-riders in P2P networks. © Maxwell Scientific Organization, 2012.

关键词： Forecasting

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Relay power allocation in auction-based game approach

Relay power allocation in auction-based game approach

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IEEE Global communications Conference

作者： Dan Wu Yueming Cai Zhou, Liang Rodrigues, Joel Institute of Communications Engineering PLA University of Science and Technology The Key Lab of Broadband Wireless Communication and Sensor Network Technology (Nanjing University of Posts and Telecommunications) Ministry of Education Institute de Telecomunicacoes University of Beira Interior

ISBN: (纸本)9781467309202

In this work, with respect to the uncertainty about the individual information, we investigate the relay power allocation problem from the energy-efficient, Pareto optimal, and competitive fairness perspective. At first, we design an easy-implementation energy efficiency metric, which aims at striking a balance between the QoS provisioning and the energy consumption. Then, an auction mechanism is proposed for relay power allocation. By transferring the auction mechanism into a game, we prove the existence, uniqueness, and Pareto optimality of the Nash equilibrium (NE) for our auction game, and show that the allocation strategies from the NE can achieve the energy efficiency in terms of the proposed metric. Next, we develop a distributed relay power allocation algorithm based on our best-response functions to reach the Pareto optimal NE. Importantly, we not only certify the convergence of the proposed algorithm, but also provide quantitative analysis on it. Extensive simulations results are conducted to confirm the validity of the analytical results.

关键词： wireless cooperative networks Auction theory Energy efficiency Power allocation Outage probability

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A non-deterministic evaluation on SLA in cloud markets

International Journal of Digital Content Technology and its ...

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International Journal of Digital Content technology and its Applications 2012年第23期6卷 838-848页

作者： Xu, Jin-Song Yang, Geng Huang, Wan-Ming Xu, Xiao-Long Key Lab of Broadband Wireless Communication and Sensor Network Technology Ministry of Education China College of Computer Nanjing University of Post and Telecommunications China TongDa College Nanjing University of Post and Telecommunications China State Key Laboratory for Novel Software Technology Nanjing University China

The primary issue in dynamic cloud computing environments is how to select and schedule the ideal and different cloud resources to cooperation in order to guarantee the requirements of applications. This paper proposed a novel cloud services selection algorithm for hierarchy evaluation of SLA, which is selecting the proper resources to compromise services. The service level agreement can only ensure completion of the application. Through fuzzing the SLA attribute, this paper conducted a non-deterministic evaluation on the SLA attribute data provided by cloud service providers using variable weights. Based on the relationships among different SLA attributes, a better cloud service will be selected in a Service Oriented Architecture. The experimental results show the effectiveness of the algorithm: there is no force in the relationship between sub-tasks in the case, each cloud resource and service providers can effectively reduce the cost of application based on recommendations;with the introduction of mandatory use of strong relationships and recommendation of service resources, the effectiveness of the application is ensured while reducing the total consumption of services;the right way to use fuzzy variable cloud resources involved in service evaluation will help to cut the cost of commercial cloud services and providing users with better services.

关键词： Cloud computing

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Secure query in wireless sensor network using underground parties

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Journal of networks 2012年第12期7卷 2063-2069页

作者： Huang, Haiping Dou, Yi Chen, Jiutian Feng, Juan Qin, Xiaolin College of Computer Sci. and Tech. Nanjing University of Aeronautics and Astronautics Nanjing 210016 China College of Computer Nanjing University of Posts and Telecommunications Nanjing 210003 China Jiangsu High Technology Research Key Laboratory for Wireless Sensor Networks Nanjing 210003 China Key Lab of Broadband Wireless Communication and Sensor Network Technology of Ministry of Education Nanjing China University of Posts and Telecommunications Nanjing 210003 China

Recently, secure query has become a significant issue for researchers. It proposes the concept of secure multi-party query in Internet of things or sensor networks making use of "underground parties" to guarantee network security. Based on a novel network model assumption, it adopts homomorphic privacy and secure multi-party computation techniques to realize the above mentioned secure query, and then it puts forward the horizontal and vertical query algorithm in the top-k query through cooperation of underground parties. Thereafter, by the simulation tests it compares the time efficiency of the proposed algorithm with other typical sort algorithms under different top-k scenarios. At last, it analyzes the relationship between query time and number of underground party nodes. © 2012 ACADEMY PUBLISHER.

关键词： wireless sensor networks

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A random linear coding algorithm for cognitive wireless mesh networks

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Journal of Convergence Information technology 2012年第6期7卷 112-120页

作者： Qi, Jin Zhang, Shunyi Li, Shujing Cao, Lu Key Lab of Broadband Wireless Communication and Sensor Network Technology Nanjing University of Posts and Telecommunications Ministry of Education Nanjing 210003 China Institute of Information and Network Technology Nanjing University of Posts and Telecommunication Nanjing 210003 China College of Information Engineering FuYang Teachers' College Fuyang 236000 China

In viewing of the problem that network coding can improve network throughput as well as increase network complexity, this paper proposed a special cognitive wireless mesh network topology while constructed a novel coding algorithm. In the multicast model based on wireless channel, the algorithm improved information transmission rate to some extent with random linear processing of data at intermediate nodes, therefore transported several combinations of data messages. Compared with traditional random message distribution algorithms, the proposed algorithm can reduce transmission number of source packets effectively and improve network throughput measured with network coding gain. The effectiveness of the algorithm has been verified by the theoretical deduction and experimental results.

关键词： network coding

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Cognitive networks available resource health assessment model based on intelligent agent

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Advances in Information Sciences and Service Sciences 2012年第5期4卷 226-234页

作者： Qi, Jin Zhang, Shunyi Li, Linguo Sun, Yanfei Key Lab of Broadband Wireless Communication and Sensor Network Technology Nanjing University of Posts and Telecommunication Ministry of Education Nanjing 210003 China Institute of Information and Network Technology Nanjing University of Posts and Telecommunication Nanjing 210003 China College of Information Engineering FuYang Teachers' College Fuyang 236000 China

Refers to the both dynamic and multivariate network environment, we proposed a cognitive networks(CNs) available resource health assessment model, did health assessment of CNs resource availability through comprehensive fuzzy assessment model based on intelligent agent according to user Quality of Service(QoS) combined with network real-time state. Finally, by taking video on demand (VOD) as an example, we assessed the health degree of VOD service. The experimental results represented that the proposed approach can real-timely assess overall network performance as well as CNs available resource health effectively, therefore further guarantee the CNs overall performance and service end to end QoS.

关键词： Health

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Reliability based radio frequency identification reader redundant optimization model in electronic product code network

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International Journal of Advancements in Computing technology 2012年第18期4卷 577-584页

作者： Xu, He Wang, Suo-Ping Wang, Ru-Chuan College of Computer Nanjing University of Posts and Telecommunications Nanjing 210003 China College of Automation Nanjing University of Posts and Telecommunications Nanjing 210003 China Jiangsu High Technology Research Key Laboratory for Wireless Sensor Networks Jiangsu Nanjing 210003 China Key Lab of Broadband Wireless Communication and Sensor Network Technology Nanjing University of Posts and Telecommunications Ministry of Education Jiangsu Province Nanjing 210003 China

The Electronic Product Code (EPC) network, originally developed by the Auto-ID Center with its standards now managed by EPCglobal, is designed and implemented to enable all objects in the world to be linked via the Internet for all time. EPC is the next evolution of product identification, utilizing Radio Frequency Identification (RFID) technology to identify objects. RFID technology has been widely used in many areas, and how to deploy of a large number of readers becomes a core challenge due to the limited read range between reader and tag. This paper proposes a novel reader redundant optimization model for finding optimal redundant number of readers and their positions to cover all tags with using optimization algorithm in EPC network. Firstly, we give an overview of the collision problems in RFID system. Secondly, we propose reliability based RFID reader system model. Thirdly, we use ant colony algorithm to solve this optimization problem. Analysis results show the effectiveness of the proposed system model and simulation results show that the algorithm is effective in achieving the goal of this optimal solution.

关键词： Ant colony optimization

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A novel integrity-preserving privacy data aggregation in sensor networks

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Journal of Computational Information Systems 2012年第20期8卷 8471-8478页

作者： Zhou, Qiang Yang, Geng Yang, Zhen Key Lab of Broadband Wireless Communication and Sensor Network Technology of Ministry of Education Nanjing University of Post and Telecommunications Nanjing 210003 China College of Computer Nanjing University of Post and Telecommunications Nanjing 210003 China College of Computer and Information Engineering Chuzhou University Chuzhou 239000 China

Data privacy and integrity preserving play important roles in application of the Internet of Things (IoT). As a part of the IoT, wireless sensor networks (WSNs) should have the function of privacy preserving and integrity checking in data aggregation. This paper proposes a novel integrity-preserving privacy data aggregation in sensor networks, which is called IPPDA. Firstly, the "slicing and assembling" technique is implemented to provide privacy preserving;then aggregation nodes perform delayed aggregation, which trades off a slight increase in communication overhead in return for the ability to execute integrity checking;finally, the child monitoring mechanism is adopted to detect the location of bogus data, remove the compromised node and eliminate communication overhead caused by bogus data. The simulation results show that IPPDA can effectively preserve data privacy, check data integrity, and get accurate data aggregation results while having less communication. © 2012 Binary Information Press.

关键词： Data privacy

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