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检索条件"机构=Beijing Key Laboratory of Network System Architecture and Convergence"

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Visual attention modeling for video quality assessment with structural similarity

Visual attention modeling for video quality assessment with ...

引用

International Symposium on Wireless Personal Multimedia Communications (WPMC)

作者： Bin Fu Zhaoming Lu Xiangming Wen Luhan Wang Hua Shao Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications China

Saliency map demonstrates the regions where the human eye will typically focus, and the key step of proposed video assessment metrics is to generate saliency map of each frame over the video sequence. However, it remains a challenge of the accuracy of saliency detection. In this paper, a lightweight multiscale approach is presented to extract spatial and temporal attention. The final saliency map is obtained by integrating two attention models. Spatial attention modeling takes into account the characteristics of the human visual system (HVS). In temporal attention modeling, we use a novel muItiscale approach method to extract motion feature, which is based on segmentation of objects in video sequence. As the temporal pooling schemes used in existing video quality assessment are only direct average or Minkowski summation of image quality scores over the video sequence, we use a procedure which takes HVS mechanism on video sequence into account adequately. In addition, the results demonstrate that the proposed method in this paper can improve the performance of video quality metrics obviously.

关键词： Computational modeling

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A novel fuzzy logic based vertical handoff decision algorithm for heterogeneous wireless networks

A novel fuzzy logic based vertical handoff decision algorith...

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International Symposium on Wireless Personal Multimedia Communications (WPMC)

作者： Peng Yang Yong Sun Chao Liu Wei Li Xiangming Wen Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications Beijing China

The next generation wireless communication systems will combine multiple wireless access networks, thus can provide mobile users with the best services. In these heterogeneous wireless networks, vertical handoff decision plays an important role to guarantee Always Best Connected (ABC) services and seamless mobility for mobile terminals. In this paper, we first introduce a speed-adaptive system discovery scheme before vertical handoff decision, which effectively improves the update rate of the candidate networks set. Then we propose a vertical handoff decision algorithm based on fuzzy logic with a pre-handoff decision method. Compared with the traditional RSS based handoff algorithm and sole fuzzy logic based handoff algorithm, the simulation results show that the proposed algorithm's performance is enhanced by reducing unnecessary handoffs, balancing the whole network resources and decreasing the probability of call blocking and dropping.

关键词： fuzzy logic mobility management (mobile radio) probability radio networks

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Transmission capacity for overlaid wireless networks: A homogeneous primary network versus an inhomogeneous secondary network

Transmission capacity for overlaid wireless networks: A homo...

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International Conference on Communications, Circuits and systems (ICCCAS)

作者： Yang Liu Changchuan Yin Jing Gao Xiaohui Sun Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications Beijing China

ISBN: (纸本)9781479930524

We study the transmission capacity of two overlaid wireless ad hoc networks, where a primary network and a secondary network operate in the same geographic region and share the same spectrum. The primary network has a high priority to access the spectrum and is oblivious of the presence of the secondary network while the secondary network limits its interference to the primary network by controlling the density of its transmitters. Assuming the primary transmitter nodes are distributed as a Poisson point process and the secondary transmitter nodes are distributed as a Matern cluster process, we present an upper and a lower bounds for the transmission capacity of the primary network and that of the secondary network. Numerical results show that the transmission capacity of the primary network and that of the secondary network have a small increment due to the inhomogeneity of the secondary network.

关键词： Nonhomogeneous media Interference Wireless networks Transmitters Laplace equations Upper bound Mobile ad hoc networks

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Weight based KNN recommender system

Weight based KNN recommender system

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2013 5th International Conference on Intelligent Human-Machine systems and Cybernetics, IHMSC 2013

作者： Wang, Bin Liao, Qing Zhang, Chunhong Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications Beijing China

ISBN: (纸本)9780769550114

Today, the personalized recommendation is one of the most important technologies in the Internet and e-commerce system, along with the increasing number of users and commodities. Among personalized recommendation algorithms, CF (Collaborate Filtering) has been researched for many years. The similarity computation method, which is the key in personalized recommender, like cosine theorem or pearson correlation coefficient, does not consider the distinguish degree of the items. In this paper, we will propose weight Based similarity algorithm, called IR-IUF++, which updates pearson correlation coefficient. IR-IUF++ performs better than traditional similarity algorithm in our experiment. © 2013 IEEE.

关键词： Correlation methods

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Optimal User Association Based on Topological Potential in Heterogeneous networks

Optimal User Association Based on Topological Potential in H...

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IEEE International Symposium on Personal, Indoor and Mobile Radio Communications

作者： Rui Han Chunyan Feng Hailun Xia Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications Beijing China

ISBN: (纸本)9781467362337

In traditional cellular networks, User Equipments (UEs) always connect to the strongest Base Station (BS), which offers either the maximum Signal to Interference Plus Noise Ratio (SINR) or the best Reference Signal Received Power (RSRP). However, in heterogeneous networks, due to a large difference of transmit power between macrocells and low power nodes, the user association methods mentioned above may lead to unbalance of user distribution between the two kinds of BSs. The goal of our research is to balance the user association between macrocells and picocells while maintain the network performance. We solve the user association problem by introducing the topological potential between UEs and BSs, from which both the channel condition and the number of severing UEs in each cell are considered. Since maximizing the topological potential in network-wide is NP-hard, a heuristic method is proposed to reach a suboptimal. Finally, the tradeoff between association fairness and network throughput is discussed via system level simulation, and a better fairness user association is given compared to the range expansion method in the same condition of network throughput.

关键词： Heterogeneous networks topological potential fairness associaton

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Power control algorithm with active link protection for two-tier femtocell networks

Power control algorithm with active link protection for two-...

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International Symposium on Wireless Personal Multimedia Communications (WPMC)

作者： Yuanbao Xie Wei Zheng Wei Li Jingfang Liu Xiangming Wen Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications Beijing China

Femtocell is a promising cost-effective technology for enhancing indoor coverage with high-rate data. However, femtocell base station (FBS) is controlled by terminal users, the bursty interference caused by femtocell will greatly degrade the Quality of Service (QoS) of macrocell users (MUEs), and even cause their communication interrupt. To address this problem, this paper investigates a suite of distributed power control algorithm with active link protection in two-tier femtocell networks. First, MUE collects the pilot signal power strength of FBSs at predetermined time interval to judge the presence of nearby femtocells. Second, MUE chooses an access channel (AC), and then initializes the protection margin of the signal to interference plus noise ratio (SINR) and transmitted power for this AC according to the above judgment. Finally, MUE and femtocell users (FUEs) update their transmitted power synchronously by the modified distributed power control based on active link protection (DPC/ALP) algorithm to maintain their QoS. Numerical examples show that the proposed scheme can be effectively applied in two-tier femtocell networks, and provide an acceptable admission speed and an effective QoS protection for both MUEs and FUEs.

关键词： Quality of service Signal to noise ratio Interference Economic indicators

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An adaptive cross-layer optimization scheme for high-definition video transmission based on IEEE 802.11n

An adaptive cross-layer optimization scheme for high-definit...

引用

International Conference on Communications, Circuits and systems (ICCCAS)

作者： Yan Wang Danpu Liu Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications Beijng China

ISBN: (纸本)9781479930524

As a novel branch of widely used Wi-Fi technology, IEEE 802.11n has improved its maximum data rate to 600Mbps, which makes the transmission of high-definition video possible. Although many techniques have been adopted to maximize data rate for high definition(HD) video transmission, very few researches keep an eye on video distortion in parallel with proper data rate. In this paper, we present a cross-layer optimization scheme for HD video transmission based on IEEE 802.11n, which can adaptively adjust quantization parameter (QP) on video coding layer (VCL) and modulation and coding scheme (MCS) on PHY to minimize the received video distortion. Simulation results prove that the proposed scheme can select a proper QP and MCS for a given SNR and obviously improve the quality of the received video in terms of PSNR.

关键词： IEEE 802.11n Standard Optimization Bit error rate PSNR Encoding Approximation methods

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A simple adaptive STDMA scheduling scheme in mmWave wireless networks

A simple adaptive STDMA scheduling scheme in mmWave wireless...

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International Conference on Communications, Circuits and systems (ICCCAS)

作者： Guangcan Yan Danpu Liu Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications Beijng China

ISBN: (纸本)9781479930524

In this paper, we investigate the problem of medium access control in 60GHz mmWave directional wireless networks, and propose an adaptive STDMA scheduling scheme for throughput enhancement. By taking advantage of directivity in millimeter-wave communication, the proposed adaptive STDMA scheduling scheme allocates a single TDMA time-slot to multiple communication links simultaneously for throughput enhancement. The co-channel interference (CCI) among links is considered in adaptive scheduling process, and related MAC design is presented in detail. We evaluate the scheduling scheme through MATLAB simulations, and compare it with existing scheduling algorithm. The results show that the proposed scheduling scheme achieves higher throughput than the existing algorithm.

关键词： Throughput Adaptive scheduling Antenna arrays Adaptation models Interference Adaptive systems

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Software Defined networking for HTTP Video Quality Optimization

Software Defined Networking for HTTP Video Quality Optimizat...

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2013 15th IEEE International Conference on Communication Technology

作者： Hui Liu Yihong Hu Guochu Shou Zhigang Guo Beijing University of Posts and Telecommunications Beijing Laboratory of Network System Architecture and Convergence

ISBN: (纸本)9781479900763

In this paper,the scheme to improve HTTP video quality using Software Defined networking(SDN) is ***,by analyzing the characteristics of current HTTP video and the defects of the widely used Content Delivery network(CDN),a HTTP video content delivery scheme is proposed in SDN ***,the authors build SDN experimental platform,and present five experiments to measure video quality in the presence of different round-trip delay according to round-trip delay test results of HTTP video access in both SDN and actual network environment(including CDN).Finally,the user QOE of the video measured in each experiment is calculated and *** all experimental results examined,SDN scheme yields a substantial improvement in HTTP video quality and user QOE,and achieves more than Good level of video quality and MOS>4 user QOE even in poor network environment with high pocket loss rate.

关键词： SDN HTTP video Programmable Storage Router CDN QOE RTT

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A virtual network embedding algorithm based on virtual topology connection feature

A virtual network embedding algorithm based on virtual topol...

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International Symposium on Wireless Personal Multimedia Communications (WPMC)

作者： Hongyan Cui Wenjun Gao Jiang Liu Yunjie Liu Key Laboratory of Network System Architecture and Convergence Key Laboratory of Universal Wireless Communications Beijing University of Posts and Telecommunications Beijing China

Virtual network mapping provides a promising way to solve the ossification of current Internet. Mapping multiple virtual topologies onto a shared substrate network is a challenging problem. In this paper, we provide a new virtual network embedding algorithm based on virtual topologies connection feature and introduce a node connection-degree to measure the priority of the alternative physical nodes. Using the node connection-degree based on the virtual topologies feature, we can select nodes which are closer to each other and the algorithm will be more effective. Multiple simulation results show that our new algorithm enhances the performance of the acceptance ratio, long-term revenue/cost ratio (RIC) and the runtime compared with the existing embedding algorithms.

关键词： Substrates Quality of service

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