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International Conference on wireless communications and Signal Processing (WCSP)

作者： Lihua Gao Haitao Ling Xutong Fan Jianxin Chen Qin Yin Lei Wang China Telecom Co Jiangsu Branch. Key Lab of Broadband Wireless Communication and Sensor Network Technology University of Telecommunications Ministry of Education Nanjing Multimedia Service Product Dept. China Telecom Co Jiangsu Branch Key Lab of Broadband Wireless Communication and Sensor Network Technology Nanjing University of Telecommunications Ministry of Education

ISBN: (纸本)9781509028610

With the popularity of network, P2P-based Video on Demand (VoD) has become one of the main services in Internet. However, due to the huge amount of videos, how to access the video quickly is important since it affects the subscriber's experience. In this paper, a popularity-driven storing model is proposed to fasten the video discovery for a centralized P2P-VoD system. All videos are stored in a binary tree in the server according to their popularities. Experimental results show that this scheme works well in terms of discovery delay and resource utilization.

关键词： Binary trees Servers Delays Peer-to-peer computing Telecommunications Computational modeling wireless communication

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Online energy management for data centers and electric vehicles in smart grid environment

Online energy management for data centers and electric vehic...

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Annual Conference of Industrial Electronics Society

作者： Liang Yu Yulong Zou Kun Wang Key Laboratory of Broadband Wireless Communication and Sensor Network Technology of Ministry of Education Nanjing University of Posts and Telecommunications Nanjing China

To avoid an additional demand charge incurred by the adoption of electric vehicles (EVs), we study an online cost minimization problem for geo-distributed data centers and EVs of their employees without violating heterogeneous EV charging delays and the given peak power limits in all geographical locations, where the total cost consists of the electricity bill, revenue loss, and the penalty imposed on unfinished EV demands. We first formulate a stochastic programming problem with the considerations of uncertainties in data center workloads, electricity prices, and EV energy demands. Since the future parameters are uncertain, an online algorithm is proposed to solve the formulated problem. Moreover, the performance analysis of the online algorithm is conducted. Simulation results indicate the advantages of the proposed algorithm over other baselines.

关键词： Algorithm design and analysis Delays Minimization Servers Electric vehicles Distributed databases Uncertainty

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T-QoS-aware based parallel ant colony algorithm for services composition

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Journal of Systems Engineering and Electronics 2015年第5期26卷 1100-1106页

作者： Lin Zhang Kaili Rao Ruchuan Wang College of Computer Nanjing University of Posts and Telecommunications Institute of Computer Technology Nanjing University of Posts and Telecommunications Jiangsu High Technology Research Key Laboratory for Wireless Sensor Networks Key Lab of Broadband Wireless Communication and Sensor Network Technology Nangjing University of Posts and Telecommunications

In order to make cloud users get credible, high-quality composition of services, the trust quality of service aware(TQoS-aware) based parallel ant colony algorithm is proposed. Our approach takes the service credibility as the weight of the quality of service, then calculates the trust service quality T-QoS for each service, making the service composition situated in a credible environment. Through the establishment on a per-service T-QoS initialization pheromone matrix, we can reduce the colony’s initial search time. By modifying the pheromone updating rules and introducing two ant colonies to search from different angles in parallel,we can avoid falling into the local optimal solution, and quickly find the optimal combination of global solutions. Experiments show that our approach can combine high-quality services and the improvement of the operational success rate. Also, the convergence rate and the accuracy of optimal combination are improved.

关键词： services composition trust service quality ant colony algorithm parallel

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Stable time synchronization for wireless sensor network by adaptive value tracking

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ICIC Express Letters, Part B: Applications 2016年第1期7卷 135-141页

作者： Hu, Bing Sun, Zhixin Key Laboratory of Broadband Wireless Communication and Sensor Network Technology Nanjing University of Posts and Telecommunications No. 66 New Mofan Road Nanjing210003 China

A desirable time synchronization protocol based on flooding in wireless sensor networks (WSNs) should neither demand fast propagation of latest time information nor keep track of the neighboring nodes. Moreover, such a protocol is strictly required to have a stable and energy efficient synchronization process. In this paper, we propose a stable time synchronization algorithm by adaptive value tracking that has smooth convergence process and low energy consumption. By considering both logical clock value and average rate of logical clock, each sensor node keeps synchronization with the rate of reference clock through successive feedbacks, and then adjusts clock offset of the node, and the network-wide synchronization is established fast without demanding fast propagation of latest time information and keeping track of the neighboring nodes. From our example comparison, we observed that the proposed algorithm provides stable time synchronization compared to the time synchronization algorithm by adaptive value tracking. © 2016.

关键词： Synchronization

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Device-free multiple people daily activity recognition using the channel state information of Wi-Fi signals

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International Journal of Smart Home 2016年第9期10卷 103-112页

作者： Al-qaness, Mohammed Abdulaziz Aide Li, Fangmin Key Laboratory of Fiber Optical Sensing Technology and Information Processing Ministry of Education Hubei Key Laboratory of Broadband Wireless Communication and Sensor Network Wuhan University of Technology Wuhan430070 China

This paper demonstrates on the problem of device-free multiple people daily activity recognition, which is very crucial for human computer interaction. The main idea of this paper lies in that we introduce channel state information of Wi-Fi signals to recognize multiple people daily activity. Channel state information is used in the receiver end to analyze features of a communication channel to detect tampering through the transmitter. In order to alleviate the negative influence of radio frequency interference, we define window size to build up vectors of Channel state information. Afterwards, the proposed device-free multiple people daily activity recognition method is implemented by solving the sparse representation classification problem using minimization. To testify the effectiveness of the proposed method, we set the experiment setting with a bedroom and a living room;moreover, two persons and a cat are set in this experiment. Experiments results show that proposed device-free multiple people daily activity recognition method is able to promote activity recognition accuracy under different experiment settings.

关键词： Channel state information

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TA3C: Teaching-Oriented Adaptive Wi-Fi Authorized Access Control Based on CSI

TA3C: Teaching-Oriented Adaptive Wi-Fi Authorized Access Con...

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International Conference on Mobile Ad-hoc and sensor networks, MSN

作者： Fu Xiao Jing Chen Xiaohui Xie Lijuan Sun Ruchuan Wang Key Lab of Broadband Wireless Communication and Sensor Network Technology of Ministry of Education Jiangsu China College of Computer Nanjing University of Posts and Telecommunications Jiangsu China

ISBN: (纸本)9781509056972

Wi-Fi has been widely deployed with the rapid development of wireless communication technique. Wi-Fi hotspots are popular in campus, making convenient wireless network access possible. However, during class teaching, in order to avoid students browsing the web based on Wi-Fi hotspots and distracting, we hope Wi-Fi hotspots adaptively shield network access to students in the classroom, while grant access to users outside the classroom. In this work, we prototype TA3C system, a teaching-oriented adaptive Wi-Fi authorized access control scheme, using Channel State Information (CSI) to locate instead of coarse-grained and temporally unstable Received Signal Strength Indication (RSSI). CSI can distinguish multipath signals, stay stable in the same propagation environment, and show different characteristics in different propagation environments, based on which, we can distinguish outdoor and indoor environments, and identify user's location to decide whether to offer him wireless network access or not. Experiment results show that TA3C effectively achieve adaptive Wi-Fi authorized access control, which provides a guarantee for the quality of class teaching. Compared to traditional indoor localization techniques, TA3C does not need accurate location information but simply recognizes user's location indoors or outdoors, which means it does not need dedicated hardware, realizing the low-cost indoor localization technique.

关键词： wireless communication wireless fidelity wireless sensor networks Antennas Fingerprint recognition Correlation coefficient Correlation

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A New Fragmentation Strategy for Video of HTTP Live Streaming

A New Fragmentation Strategy for Video of HTTP Live Streamin...

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International Conference on Mobile Ad-hoc and sensor networks, MSN

作者： Xiaorui Li Lei Wang Jingwu Cui Baoyu Zheng National Mobile Communications Research Laboratory Southeast University Nanjing China Key Lab of Broadband Wireless Communication and Sensor Network Technology (NUPT) Nanjing China

ISBN: (纸本)9781509056972

To achieve the flexible and efficient transmission of files in the video on demand system, this paper proposed a three-tier fragmentation strategy which provided a unfiled method of fragmentation for video of HTTP Live Streaming and large file. In order to prove the rationality of the three-tier fragmentation strategy, we compared it with the two layers fragmentation strategy and the fragmentation strategy of equal time. And the comparisons proved the superiority of three-tier fragmentation strategy.

关键词： Peer-to-peer computing IPTV Packet loss Video on demand Data communication

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Design of P2P Application Layer Protocol

Design of P2P Application Layer Protocol

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International Conference on Mobile Ad-hoc and sensor networks, MSN

作者： Yujie Ma Lei Wang Jingwu Cui Baoyu Zheng National Mobile Communications Research Laboratory Southeast University Nanjing China Network Technology (NUPT) Key Lab of Broadband Wireless Communication and Sensor Nanjing China

ISBN: (纸本)9781509056972

On the basis of studying the principle and application technology of P2P protocol, we design the private protocol of P2P application layer to meet the needs of P2P communication. This application layer protocol splits up video into three types of blocks in order to improve transmission efficiency. Besides, the protocol can be expanded when needed since there are some invalid bits in the state list.

关键词： Peer-to-peer computing Protocols Streaming media Authentication Servers Sockets Law

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A New BDI Forecasting Model based on Support Vector Machine

A New BDI Forecasting Model based on Support Vector Machine

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2016 IEEE Information technology,networking,Electronic and Automation Control Conference(ITNEC 2016)

作者： Jianmin Bao Lin Pan Yuanfa Xie Key Lab of Broadband Wireless Communication and Sensor Network Technology (Jiangsu Provincial Engineering Research Center of Telecommunications and Network Technology) Ministry of Education Baer Institute of Excellence Nanjing University of Posts and Telecommunications

ISBN: (纸本)9781467391955

BDI(Dry Baltic Index) is a barometer of the shipping market, which is very important and difficult to predict precisely. The traditional forecasting method is not enough to predict precisely for it with higher complexity. The support vector machine has strong nonlinear function approximation and strong generalization ability. In this paper, a new BDI forecasting model based on support vector machine combined with CFS(Correlation-based Feature Selection) is presented and we first introduce the macroeconomic fundamental indicators of BDI. Firstly, we studied and researched the main macroeconomic fundamental indicators of BDI, investigate the inherent law and external influence of freight index fluctuation, and then put forward the BDI forecasting model based on support vector machine and demonstrate the construction principle of the forecasting model. Finally, in order to evaluate the predictive power of support vector machines, we compare their performance with the neural network model. The results show that the SVM model has a better performance in both the trend and the forecast precision, which can provide a powerful tool for the shipping market operators and investors to grasp the market trend and avoid the price risk.

关键词： BDI support vector machine feature selection CFS modeling

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Sleeping-time Analysis for Cognitive OFDM-PON

Sleeping-time Analysis for Cognitive OFDM-PON

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International Conference on wireless communications and Signal Processing

作者： Qiang Yu Xiaoting Yu Xiao Wu Lei Wang Baoyu Zheng Global Energy Interconnection Research institute Key Lab of Broadband Wireless Communication and Sensor Network Technology (NUPT) National Mobile Communications Research Laboratory Southeast University

ISBN: (纸本)9781509028610

In this paper, we introduce the concept of OFDM-PON, and introduce the best method to choose the maximum sleep time based on link speed and queue buffer capacity. By analyzing the relationship between the longest sleep time and the queue buffer capacity, it is concluded that inducing cognition into OFDM-PON can be used as an effective method to improve the energy efficiency.

关键词： Cognition OFDM-PON Sleeping time Link speed Queue buffer capacity

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