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IEEE Conference on Vehicular Technology (VTC)

作者： Liya Shan Qing Liao Qinyue Hu Shantao Jiang Jingling Zhao Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications Beijing P.R. China

ISBN: (纸本)9781479980925

In this paper, a Quality of Experience (QoE)-driven cross-layer resource allocation scheme for high traffic services over Open Wireless network (OWN) downlink is proposed. And the main novelty of this paper is that it solves the resource allocation problem about the users in overlap region of adjacent cells through central controller without the communication between different cells. Also, we have adopted the QoE assessment models for BestEffort and video services to abstract its' Mean Opinion Score (MOS) value. And we use the cross- layer architecture which considers the parameters in application layer, media access control layer and physical layer jointly. Then, we build the mathematical model of the resource allocation problem. Based on the Binary Constrained Particle Swarm Optimization (B_CPSO) algorithm, the optimization results can be found. In addition, Simulation results show that the proposed scheme have better performance than the other schemes in terms of maximizing average users' MOS value for the whole system as well as maintaining fairness among users.

关键词： Resource management Wireless networks Quality of service Packet loss Degradation

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Discretization of an Square Electromagneic Cloak based on Transformation Optics

Discretization of an Square Electromagneic Cloak based on Tr...

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The 6th International Symposium on Microwave,Antenna,Propagation,and Electromagnetic Compatibility Technologies(MAPE 2015)

作者： Li Deng Weijun Hong Shufang Li Jianfeng Zhu Biao Peng Botao Feng Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications Department of Electronics Engineering Shenzhen University

Existing discrete electromagnetic cloaks are often limited to circular shape and always based on one dimensional discretization of radius variable in cylindrical coordinates. In this paper, we proposed a two dimensional(2D) discrete square invisible cloak which really does not require any continuous constitutive material parameters. The discrete square cloak consists of several homogeneous blocks, and they are discretized from the original transform medium whose material parameters are often continuous spatial functions of both x and y variables in Cartesian coordinates. With proper design of numbers of blocks, we demonstrated the scattering properties of the proposed cloaking structure through rigorous analysis of the scattered electromagnetic fields. The proposed cloaking structure could be possibly realized, therefore may lead to a practical path to an experimental demonstration of electromagnetic cloaking.

关键词： discrete cloak transformation optics arbitrary polygon cloak

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Unequal power allocation for real-time uncompressed video transmission over wireless channels

Unequal power allocation for real-time uncompressed video tr...

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IEEE International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC)

作者： Zhilong Zhang Danpu Liu Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications Beijing P. R. China

Uncompressed video transmission has recently attracted research attentions because it ensures low end-to-end latency, high video quality and low complexity. In this paper, we propose a real-time uncompressed video transmission system, where unequal power allocation (UPA) strategies are adopted to minimize the end-to-end mean square error (MSE). Specifically, the relationship between the bit error rate (BER) and the MSE is established. Based on the relationship, an optimization problem is formulated, where both the power budget and the peak-to-average power ratio (PAPR) constraint are satisfied. By solving the problem, an optimal iterative UPA algorithm and a suboptimal simplified UPA algorithm are proposed. Simulation results show that the peak signal-to-noise ratio (PSNR) of the reconstructed video is improved largely.

关键词： Streaming media Resource management Peak to average power ratio Bit error rate Wireless communication Fading Signal to noise ratio

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A Distributed Scheduling Algorithm for Heterogeneous Cache-Enabled Small Cell networks Using ADMM

A Distributed Scheduling Algorithm for Heterogeneous Cache-E...

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IEEE Conference on Vehicular Technology (VTC)

作者： Zhilong Zhang Danpu Liu Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications Beijing P. R. China

ISBN: (纸本)9781479980925

We consider designing a distributed scheduling algorithm for multi-homing users in heterogeneous cache-enabled small cell networks. The aim is to minimize the total operation cost on condition that all users' QoS requirements are satisfied. The proposed algorithm is based on alternating direction method of multipliers (ADMM) and can be carried out in each small cell base station (SCBS) independently. Simulation results show that the operation cost converges to the global optimum after a few iterations and the proposed algorithm outperforms a conventional distributed method largely.

关键词： Quality of service Power demand Microprocessors Computer architecture Wireless communication Optimization Manganese

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Spatial and temporal mobility analysis in LTE mobile network

Spatial and temporal mobility analysis in LTE mobile network

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IEEE Conference on Wireless Communications and networking

作者： Qiujian Lv Yufei Di Yuanyuan Qiao Zhenming Lei Chao Dong Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications Beijing China Agricultural Bank of China Beijing China

ISBN: (纸本)9781479984077

As smartphones and location-based services gain mainstream popularity, human location histories analysis and user's future location prediction attract increased interest. Predicting the human mobility mainly on users' spatial movement has been conducted in extensive studies. In this paper, we focus on the user mobility prediction from spatial-temporal perspective, and implement several slot-based continuous next-place prediction models considering various contexts. The entropy is also measured to explore the influence of the intrinsic of user's trace on prediction performance. We experiment with real-world data derived from the factual LTE mobile network, and evaluate the performance of proposed predictors with several metrics. By thoroughly experimental analysis, our finding shows that user mobility is highly dependent on both temporal and spatial behavior. Models considering the spatial context of current and previous locations can achieve high accuracy and robustness in both spatial and temporal prediction. Also, the spatial movement independent temporal predictors gain an edge for users whose mobility is in a regular pattern.

关键词： Predictive models Entropy Markov processes Context Mobile communication Context modeling Accuracy

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Energy efficient session grouping scheme in network-coded cooperative communications

Energy efficient session grouping scheme in network-coded co...

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International Conference on Communications and networking in China (CHINACOM)

作者： Xiaomei Shen Tiankui Zhang Zhimin Zeng Xiao Lin Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications Beijing China Nanchang University Nanchang Jiangxi CN

ISBN: (纸本)9781479987962

network coding (NC) is an effective way to improve network throughput in cooperative communications. Researches have proved that the NC noise increases monotonically with session group size, which reduces throughput gain of network-coded cooperative communications (NC-CC). However, only few studies concern with the problem that receiver circuit power consumption with NC also increases as session group size enlarges. In this paper, an energy efficient session grouping scheme is proposed. Frist, the optimal energy efficient session grouping problem is modeled as the ratio of network throughput to total power consumption, in which the network throughput with NC noise and receiver circuit power consumption are taken into account. Then, we use quantum particle swarm optimization (QPSO) to solve this optimization problem. According to the solution of QPSO, we propose a session grouping scheme, which can improve the energy efficiency of NC-CC. Simulation results demonstrate that the proposed scheme can achieve better energy efficiency, compared with the direct transmission scheme and opportunistic cooperative communication scheme.

关键词： Energy efficiency Throughput Power demand Receivers Relays Unicast Tin

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Grey relational analysis based cross-layer caching for content centric networking

Grey relational analysis based cross-layer caching for conte...

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IEEE International Conference on Communications in China (ICCC)

作者： Lixia Wu Tiankui Zhang Xiaogeng Xu Zhimin Zeng Yinlong Liu Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications Beijing China Institute of Information Engineering Beijing CA China

In-networking caching is one of the most significant features in content centric network (CCN) to improve the content delivery efficiency. Some recent researches work on multi-metrics caching strategies to further improve the caching performance and caching space utilization. Nevertheless, it is still left open to deploy the correlation among multiple metrics. In this paper, a grey relational analysis (GRA) based cross-layer caching strategy is proposed. Firstly, user preference, betweenness centrality and caching replacement rate classified in application layer, network layer and physical layer, respectively are selected as the key metrics to caching strategy design. Then, an appropriate caching process based on GRA jointly considering the above three metrics of each node along the delivery path is developed. Simulation results demonstrate that the proposed strategy can achieve higher cache hit ratio and less average hops compared with well-known caching strategies.

关键词： Physical layer Next generation networking Cooperative caching Correlation Delays Social network services

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A multi-hop broadcast routing algorithm based on real-time traffic estimation for VANETs

A multi-hop broadcast routing algorithm based on real-time t...

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International Conference on Telecommunications (ICT)

作者： Fan Zhang Tao Luo Jianfeng Li Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications Beijing China Beijing University of Posts and Telecommunications Beijing Beijing CN

In this paper, we propose an efficient multi-hop broadcast routing algorithm based on Real-time Traffic Estimation in vehicular ad-hoc networks (VANETs) including a novel relay node selection scheme and an efficient adaptive rebroadcast wait delay strategy. Firstly, we take the overall traffic information into consideration to select the relay node, which is different with the traditional scheme only considering the distance information. In order to obtain more accurate traffic information in the target road segment, we employ the real-time traffic estimates algorithm to predict the information. Furthermore, we also reduce the rebroadcast waiting just select only one rebroadcast node by considering many influence factors such as the traffic density and the vehicle information. Therefore, a weighted utility function (WUF) is formulated to comprehensively consider the effect of these factors. Furthermore, the value of WUF can also be utilized to determine the waiting time of the rebroadcast node to achieve the adaptive wait scheme. Finally, the timeout retransmission strategy is employed to improve the reliability of broadcast message transmission at the source node. Theoretical and simulation results demonstrate the effectiveness of the proposed algorithm in terms of the packet delay, data redundancy, effective permeability and network robustness, when compared with classical M-Flood and Slotted algorithms.

关键词： Vehicles Routing Delays Prediction algorithms Algorithm design and analysis Real-time systems Reliability

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Broadcasting based neighborhood cooperative caching for content centric ad hoc networks

Broadcasting based neighborhood cooperative caching for cont...

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IEEE International Conference on Communications in China (ICCC)

作者： Le Zhou Tiankui Zhang Xiaogeng Xu Zhimin Zeng Yinlong Liu Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications Beijing China Institute of Information Engineering Beijing CA China

Content centric networking is a promising technology for data dissemination, which can be used in wireless ad hoc networks to cope with short-lived connectivity and dynamic topologies in wireless environments. Meanwhile, the broadcast nature of radio channel can be leveraged to improve the cooperative cache gain of content centric ad hoc networks. In this paper, a broadcasting based neighborhood cooperative caching (BNC) strategy is proposed. In BNC, a node selects caching node among its adjacent nodes and informs its caching node to cache the content while forwarding the data packet. By making best of the broadcast nature of radio channel, BNC achieves neighborhood cooperative caching without occupying extra wireless channel resource. In addition, the method of topology potential is exploited to make caching decision among adjacent nodes. Simulation results show that BNC can lead to better utilization of network cache space without deteriorating the network performances.

关键词： Topology Ad hoc networks network topology Cooperative caching Wireless communication Broadcasting Next generation networking

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Self-adaptive genetic algorithm for LTE backhaul network

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Journal of networks 2014年第3期9卷 682-688页

作者： Li, Li Song, Hui Chen, Jianya Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications Beijing China

Mobile communication evolution from 2G, 3G to LTE shows a broadband and IP-oriented trend and the architecture of LTE backhaul network turns to be flat. In order to fit these new features, layer 3 routing technology has to be adopted in backhaul network and needs to be modified to fit it. In this paper, a new algorithm, named Self-Adaptive Genetic Algorithm (SAGA), is proposed to meet the demand of providing a highly efficient and QoS guaranteed routing scheme for LTE backhaul network. It can be used in Open Shortest Path First protocol (OSPF) as the core path selection algorithm. It is based on traditional genetic algorithm(GA) but improves the population initialization process in it as well as proposes a new fitness calculation function for it. Simulation verifies it can balance not only the traffic of network but also the load of MME pools, which improves the utility efficiency of the whole network. © 2014 ACADEMY PUBLISHER.

关键词： Quality of service

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