Hui Tang

Chongqing University, Ch’ung-ch’ing-shih, Chongqing Shi, China

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Publications (63)29.69 Total impact

  • EURASIP Journal on Wireless Communications and Networking 12/2015; 2015(1). DOI:10.1186/s13638-015-0270-0 · 0.81 Impact Factor
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    ABSTRACT: In the recent years, energy harvesting technology has been integrated into wireless sensor networks for resolving the energy “bottleneck” problems caused by the limited-capacity batteries equipped in traditional sensor nodes. However, due to the limited capacity of energy buffers equipped for storing the harvested energy, excessive harvested energy is indiscreetly discarded while sensor nodes are staying at the status of energy saturation. To address this issue, we present a topology control approach, for the energy harvesting wireless sensor network, that allows each node to adaptively adjust its transmission power for utilizing the harvested energy effectively. Specifically, we first model the behaviors of sensor nodes as an ordinal potential game where the high harvesting power nodes cooperate with the low harvesting power nodes to maintain the connectivity of the whole network. And we theoretically prove the existence of a Nash equilibrium for the game. Then, a polynomial-time algorithm is proposed to achieve the Nash equilibrium. Simulation results show that our proposed scheme improves the energy availability and outperforms existing energy-aware schemes in terms of energy conservation and balanced distribution.
    Ad Hoc Networks 04/2015; 27. DOI:10.1016/j.adhoc.2014.11.022 · 1.94 Impact Factor
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    ABSTRACT: Information Centric Network (ICN) is an emerging network paradigm centered around the named contents rather than the host-to-host connectivity. The common characteristic of ICN leverages in-network caching to achieve an efficient and reliable content distribution but also brings challenges. The in-network caching technique equips all ICN routers with cache storage. However, no existing works focus on the cache storage sharing mechanism among different applications to satisfy the line speed requirements and diversity of applications in ICN. In this paper, we formulate the per-application storage management problem into an optimized resource allocation problem and introduce a manifold learning method to classify the priority of applications. Dynamic programming is adopted to solve the formulated problem and an adaptive per-application storage management scheme is proposed on the basis of the optimal solutions. Extensive experiments have been performed to evaluate the proposed scheme and show that our approach is superior to static partitioning and shared storage schemes.
    Future Generation Computer Systems 07/2014; 36:170–179. DOI:10.1016/j.future.2013.09.016 · 2.64 Impact Factor
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    ABSTRACT: Content Centric Networking (CCN) is an emerging network architecture, shifting from an end-to-end connection to a content centric communication model. Each router in CCN has a content store module to cache the chunks passed by, and is arranged in an arbitrary network topology. It is important to allocate an appropriate cache size to each router in order to both improve the network performance and reduce the economic investment. Previous works have proposed several heterogeneous cache allocation schemes, but the gain brought by these schemes is not obvious. In this paper, we introduce a data mining method into the cache size allocation. The proposed algorithm uses manifold learning to analyze the regularity of network traffic and user behaviors, and classify routers based on their roles in the content delivery. Guided by the manifold learning embedding results, a novel cache size optimization scheme is developed. Extensive experiments have been performed to evaluate the proposed scheme. Simulation results show that the proposed scheme outperforms the existing cache allocation schemes in CCN.
    Journal of Network and Computer Applications 01/2014; 37:273–281. DOI:10.1016/j.jnca.2013.03.002 · 1.77 Impact Factor
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    ABSTRACT: With the rapid development of wireless networks and mobile terminals (MTs), cooperation among MTs in heterogeneous wireless networks is currently widely investigated. Cooperation among MTs has a lot of advantages such as increasing network throughput, decreasing file download time, saving energy. Traffic distribution, which means how to distribute the traffic to the cooperating MTs, is a key issue in MTs cooperation. To improve the quality of service and user's experience, we propose two distribution approaches: time-based approach and AHP-based (analytic hierarchy process based) approach. In time-based approach, an optimization model is used, in which the transmit time is decreased to the shortest. Besides, with the QoS parameters and cost taken into consideration, we proposed the AHP-based approach, in which the client's preference is also considered. Both the two proposed approaches show better performance than the traditional approach.
    2013 19th IEEE International Conference on Networks (ICON); 12/2013
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    ABSTRACT: Peer selection is one of the key issues in wireless peer-to-peer (P2P) networks and most of the traditional methods and algorithms those have been proposed are only based on homogeneous network. However, networks in the future will be highly heterogeneous. Different kinds of wireless networks such as GSM, UMTS, WLAN, exist together in the same area and different networks have different features and abilities. Thus peer selection in heterogeneous wireless networks will become more realistic. To solve this problem, we first propose a novel mechanism in which peer and its access network are treated together as a whole entity, which we call a virtual peer and then propose a virtual peer selection (VPS) algorithm based on information entropy theory and utility function to complete our mechanism. Simulation results show that our mechanism has much better performance. Simulations show that our mechanism has a better performance both in peer ability and energy consumption.
    2013 19th IEEE International Conference on Networks (ICON); 12/2013
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    ABSTRACT: Coverage is an importance issue in wireless sensor networks. In this work, we first propose a novel notion of information coverage, which refers to the coverage efficiency of field information covered by deployed sensor nodes. On the basis of information coverage, we consider an optimization problem of how to partition the given field into multiple parcels and to deploy sensor nodes in some selected parcels such that the field information covered by the deployed sensor nodes meets the requirement. First, we develop two effective polynomial-time algorithms to determine the deployed locations of source nodes for information 1-coverage and q-coverage of the field, respectively, without consideration of communication, where information q-coverage implies that the field information in terms of information point is covered by at least q source nodes. Also, we prove the upper bound in the theoretical for the approximate solution derived by our proposed method. Second, another polynomial-time algorithm is presented for deriving the deployed locations of relay nodes. In the theoretical, this proposed algorithm can achieve the minimized number of relay nodes. Further, the related information 1-coverage algorithms are applied in our wireless sensor network-based automatic irrigation project in precision agriculture. Experimental results show the major trade-offs of impact factors in sensor deployment and significant performance improvements achieved by our proposed method. Copyright © 2013 John Wiley & Sons, Ltd.
    Wireless Communications and Mobile Computing 10/2013; DOI:10.1002/wcm.2448 · 1.29 Impact Factor
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    ABSTRACT: Wireless sensor networks (WSNs) are attractive for monitoring and gathering physical information (e.g. temperature) via lots of deployed sensors. For the applications in WSNs, Web service is one of the recommended frameworks to publish, invoke, and manage services. However, the standard Web service description language (WSDL), defines only the service input and output while ignoring the corresponding input-to-output mapping relationships. This presents a serious challenge in distinguishing services with similar input and output interface. In this paper, we address this challenge by embedding the service policy into the traditional WSDL2.0 schema to describe the input-to-output mapping relationships. The service policy is then transformed into a policy binary tree so that the similarity between different Web services can be quantitatively evaluated. Furthermore, a new service redundancy detection approach is proposed based on this similarity. Finally, the case study and experimental analysis illustrate the applicability and capability of the proposed service redundancy detection approach.
    Journal of Network and Systems Management 09/2013; 21(3). DOI:10.1007/s10922-012-9237-1 · 0.44 Impact Factor
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    ABSTRACT: Cooperation among mobile terminals (MTs) in heterogeneous wireless networks is currently widely investigated. Cooperation among MTs has a lot of advantages such as increasing network throughput, decreasing file download time, saving energy and so on. Since different cooperate MTs have different influence on quality of service and user's experience, MT selection becomes a key issue in MTs cooperation. To improve the quality of service and user's experience, we propose a novel mechanism for MT selection which we call NMC (Network MTs Cooperation) mechanism in this paper. In NMC mechanism, MTs and its access network are integrated as a virtual MT. Then we propose a Cooperative Terminal Selection (CTS) algorithm to select the optimal virtual MT. Simulation results show that NMC can help to save energy consumption of MTs as well as ensure the download rates.
    2013 IEEE Symposium on Computers and Communications (ISCC); 07/2013
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    ABSTRACT: Network virtualization aims to provide a way to overcome ossification of the Internet. However, making efficient use of substrate resources requires effective techniques for embedding virtual networks: mapping virtual nodes and virtual edges onto substrate networks. Previous research has presented several heuristic algorithms, which fail to consider that the attributes of the substrate topology and virtual networks affect the embedding process. In this paper, for the first time, we introduce complex network centrality analysis into the virtual network embedding, and propose virtual network embedding algorithms based on closeness centrality. Due to considering of the attributes of nodes and edges in the topology, our studies are more reasonable than existing work. In addition, with the guidance of topology quantitative evaluation, the proposed network embedding approach largely improves the network utilization efficiency and decreases the embedding complexity. We also investigate our algorithms on real network topologies (e.g., AT&T, DFN) and random network topologies. Experimental results demonstrate the usability and capability of the proposed approach.
    Frontiers of Computer Science (print) 06/2013; 7(3). DOI:10.1007/s11704-013-2108-4 · 0.41 Impact Factor
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    ABSTRACT: Network virtualization has been a promising technology for overcoming the Internet impasse. A main challenge in network virtualization is the efficient assignment of virtual resources. Existing work focused on intra-domain solutions whereas inter-domain situation is more practical in realistic setting. In this paper, we present a distributed inter-domain framework for mapping virtual networks to physical networks which can ameliorate the performance of the virtual network embedding. The distributed framework is based on a Multi-agent approach. A set of messages for information exchange is defined. We design different operations and IPTV use scenarios to validate the advantages of our framework. Use cases shows that our framework can solve the inter-domain problem efficiently.
    Proceedings of SPIE - The International Society for Optical Engineering 03/2013; DOI:10.1117/12.2011971 · 0.20 Impact Factor
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    ABSTRACT: The traditional cross-layer model for video streaming can achieve significant improvement to the end-to-end video quality. However, the video quality measurement in terms of sum of squared error (SSE) in the model does not always correlate well with the perception of the human visual system. In this paper, we propose a perceptual quality driven cross-layer optimization scheme based on the structural similarity (SSIM) index for wireless video streaming. The H.264/AVC encoding parameters on the application layer and the modulation and channel coding modes on the physical layer are mainly considered to optimize the end-to-end perceptual video quality. In order to decrease the computation complexity, a low complexity optimization algorithm based on the rate-quantization (R-Q) model is proposed to reduce the range of the candidate optimization parameters. Experimental results show that the proposed SSIM-based cross-layer optimization scheme achieves better perceptual quality than the SSE-based cross-layer optimization scheme, and the proposed low complexity optimization algorithm can achieve about 62% computation decrease compared to the conventional exhaustive searching algorithm with little loss in perceptual quality.
    Consumer Communications and Networking Conference (CCNC), 2013 IEEE; 01/2013
  • The 8th Int’l Workshop on Agents and Data Mining Interaction; 01/2013
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    ABSTRACT: The SSIM-based rate distortion optimization (R-DO) has been proved to be an effective way to promote the perceptual video coding performance, and the Lagrange multiplier decision is the key to the SSIM-based RD-optimized video coding. Through extensively analyzing the characteristics of SSIM-based and SSE-based video distortions, this paper presents a low-complexity content-adaptive Lagrange multiplier decision method. The proposed method first estimates frame-level SSIM-based Lagrange multiplier by scaling the traditional SSE-based Lagrange multiplier with the ratio of SSE-based distortion to SSIM-based distortion. Via predicting the macroblock's perceptual importance in the whole frame, the macroblock-level Lagrange multiplier is further refined to promote the accuracy of the Lagrange multiplier decision. Experimental results show that the proposed method can obtain almost the same rate-SSIM performance and subjective quality as the state-of-the-art SSIM-based RD-optimized video coding methods with lower computation overheads.
    Circuits and Systems (ISCAS), 2013 IEEE International Symposium on; 01/2013
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    ABSTRACT: To build the service-oriented applications in a wireless sensor network (WSN), the workflow can be utilized to compose a set of atomic services and execute the corresponding pre-designed processes. In general, WSN applications rely closely on the sensor data which are usually inaccurate or even incomplete in the resource-constrained WSN. Then, the erroneous sensor data will affect the execution of atomic services and furthermore the workflows, which form an important part in the bottom-to-up dynamics of WSN applications. In order to alleviate this issue, it is necessary to manage the workflow hierarchically. However, the hierarchical workflow management remains an open and challenging problem. In this paper, by adopting the Bloom filter as an effective connection between the sensor node layer and the upper application layer, a hierarchical workflow management approach is proposed to ensure the QoS of workflow-based WSN application. The case study and experimental evaluations demonstrate the capability of the proposed approach.
    Proceedings of the 12th Pacific Rim international conference on Trends in Artificial Intelligence; 09/2012
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    ABSTRACT: With advance in mobile 3D display, mobile 3D video is already enabled by the wireless multimedia networking, and it will be gradually popular since it can make people enjoy the natural 3D experience anywhere and anytime. In current stage, mobile 3D video is generally delivered over the heterogeneous network combined by wired and wireless channels. How to guarantee the optimal 3D visual quality of experience (QoE) for the mobile 3D video streaming is one of the important topics concerned by the service provider. In this article, we propose a QoE-oriented transcoding approach to enhance the quality of mobile 3D video service. By learning the pre-controlled QoE patterns of 3D contents, the proposed 3D visual QoE inferring model can be utilized to regulate the transcoding configurations in real-time according to the feedbacks of network and user-end device information. In the learning stage, we propose a piecewise linear mean opinion score (MOS) interpolation method to further reduce the cumbersome manual work of preparing QoE patterns. Experimental results show that the proposed transcoding approach can provide the adapted 3D stream to the heterogeneous network, and further provide superior QoE performance to the fixed quantization parameter (QP) transcoding and mean squared error (MSE) optimized transcoding for mobile 3D video streaming.
    ACM Transactions on Multimedia Computing Communications and Applications 09/2012; 8(3s). DOI:10.1145/2348816.2348821 · 0.90 Impact Factor
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    ABSTRACT: With the fast-pacing deployment of wireless sen-sor network(WSN) services, service ranking becomes more and more important. However, current service ranking methods mostly ignore the physical-level quality variation, making service ranking inaccurate. To address this problem, in this paper we propose a novel QoS-based ranking approach for WSN services, which employs the physical-level context awareness to improve the WSN service ranking. We separately calculate QoS assess-ment of each candidate service from users' perspective and physical-level context perspective. Through characterizing the impact of physical quality variation on QoS performance and user QoS assessment, a new scheme of QoS performance weighting is proposed to rank WSN candidate services. Experiments results show the effectiveness of our approach.
    06/2012; 7(6). DOI:10.4304/jnw.7.6.926-934
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    ABSTRACT: With the development of hardware and software technologies, mobile computing has become popular and pervasive. As a result, user-created mobile contents overwhelmingly increase, and cont sharing becomes the most popular application in communication networks. In order to accommodate this technical trend, a new networking architecture -named data networking (NDN) -was proposed to optimize the performance of content sharing. However, NDN has little design consideration for mobile applications, especially for the real-time multimedia applications which are very sensitive to the end-to-end network delay. Therefore, in this paper, we propose a SIP-based mobility-enabled scheme for supporting mobile multimedia applications in NDN. We will give a new description based on SIP message exchange to support mobility in NDN. Then, two enhanced approaches are proposed to further improve the handoff performance in NDN for fast handoff and the low complexity of terminal. We evaluate the proposed scheme with the OPNET simulator. The results show that the proposed SIP-based scheme can well support mobility in NDN.
    06/2012; 7(6). DOI:10.4304/jnw.7.6.918-925
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    ABSTRACT: This article addresses cooperative video summary delivery over wireless networks which inherits advantages from both cooperative communication and video summarization. In this work, a novel decode-process-and-forward (DPF) scheme is proposed for video summary transmission, where a relay node with video processing capability is involved to generate a concise version of the summary frame, called summary of summary (SoS). The SoS information is effectively consumed by the destination side to enhance its error concealment capability, leading to an improved video reconstruction quality. This article proposes a generic crosslayer optimization framework for cooperative video summary transmission, which jointly considers the source coding, relay processing parameters, power allocation, and error concealment strategy to achieve the best video quality. The problem is solved by using Lagrangian relaxation and dynamic programming. Experimental results show that the proposed scheme significantly outperforms existing cooperative and non-cooperative transmission schemes.
    IEEE Wireless Communications 04/2012; 19(2):80-87. DOI:10.1109/MWC.2012.6189417 · 6.52 Impact Factor
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    Yanwei Liu, Song Ci, Hui Tang, Yun Ye
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    ABSTRACT: 3D video technologies have been gradually matured to be moved into mobile platforms. In the mobile environments, the specific characteristics of wireless network and mobile device present great challenges for 3D video coding and streaming. The application-adapted mobile 3D video coding and streaming technologies are urgently needed. Based on the mobile 3D video application framework, this paper reviews the state-of-the-art technologies of mobile 3D video coding and streaming. Specifically, the mobile 3D video formats and the corresponding coding methods are firstly reviewed and then the streaming adaptation technologies including 3D video transcoding, 3D video rate control and cross-layer optimized 3D video streaming are surveyed.
    03/2012; 3(1). DOI:10.1007/3DRes.01(2012)5

Publication Stats

195 Citations
29.69 Total Impact Points

Institutions

  • 2015
    • Chongqing University
      • Department of Communication Engineering
      Ch’ung-ch’ing-shih, Chongqing Shi, China
  • 2009–2013
    • Chinese Academy of Sciences
      • • Institute of Acoustics
      • • High Performance Network Laboratory
      Peping, Beijing, China
  • 2010
    • University of Nebraska at Lincoln
      • Department of Computer and Electronics Engineering
      Lincoln, NE, United States
  • 2009–2010
    • Institute of Aviation
      Warszawa, Masovian Voivodeship, Poland