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

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A tracker-based cache utilization strategy in CCN

A tracker-based cache utilization strategy in CCN

引用

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

作者： Liu Hongbao Wu Muqing Hu Qian Peng Li Wang Ning Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications Beijing Peoples Republic of China

One important feature of Content-centric networking (CCN) is to utilize built-in network caches to improve the transmission efficiency of content dissemination. In CCN, all nodes have the function of caching contents. Consequently, caches are ubiquitous and diverse. How to make full use of these caches to reduce the network load and the transmission delay has become a hot research topic in recent years. In order to speed up content distribution and improve network resource utilization, a cooperative caching strategy called Tracker-based Cache Utilization Strategy (TBCUS) is proposed in this paper. In TBCUS, an idea of partial centralized management of the caches is introduced into traditional CCN. Moreover, in order to alleviate the pressure that the incurred overhead imposes on network bandwidth, TBCUS divides the whole caching system into several sub-systems. Each of the sub-systems has a tracker server as the controller and some peers. The contents cached in a sub-system are transparent to each other through the coordination of the tracker server. Once a content request reaches to a sub-system, all the caches in the sub-system can be selected to respond to this request. While the traditional caching strategy in CCN is that only the caches on the delivery path can be used to respond to the content request. TBCUS improves the cache utilization and has higher cache hit ratio and lower transmission delay and network load compared with the traditional caching strategy.

关键词： Peer-to-peer computing Servers Internet Land mobile radio Mobile computing Wireless networks

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The global flow table based on the software-defined networking

The global flow table based on the software-defined networki...

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International Conference on Computational Problem-Solving (ICCP)

作者： Qiuzheng Ren Xiaofeng Qiu Pengcheng Chen XiaoDong Liang Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications Beijing China

ISBN: (纸本)9781467365451

With the rapid development of SDN, its security problem is increasingly outstanding. Because of the openness and intelligence of SDN, the flow can be dispatched and controlled globally by the network controller. However there is not a mechanism that provides a clear visibility of the distribution, path and traffic of the whole network flows for the security equipment. Now many security detection methods need to know the distribution and behaviors of the global flows. So the paper proposes a new mechanism named global flow table and corresponding algorithms to realize the global flows' collection, the whole network flow path computation and global flows storing. This method can provide both the global details of the whole network topology and the key information of per flow mentioned above conveniently and directly for the security equipment. And we also design a structure to store the details of all flows. Then we analyze the time performance of the algorithm theoretically. The experimental result verifies the theoretical analysis and concludes that the algorithm has a good time performance. The primary affecting factors of the algorithm are the number of the flow tables and the ratio of the links to the switches.

关键词： network topology Ports (Computers) Algorithm design and analysis Security Topology Routing Sorting

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DPSO-based clustering routing algorithm for energy harvesting wireless sensor networks

DPSO-based clustering routing algorithm for energy harvestin...

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International Conference on Wireless Communications and Signal Processing (WCSP)

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

ISBN: (纸本)9781467376884

Energy harvesting wireless sensor networks (EH-WSNs) have been widely used in various areas in recent years. Unlike battery-powered wireless sensor networks, EH-WSNs are powered by energy harvested from ambience. This change calls for new designs on routing protocols in EH-WSNs. This paper proposes a novel centralized clustering routing algorithm based on discrete particle swarm optimization (DPSO). The base station (BS) gathers status information from all nodes, then runs a modified DPSO algorithm to find the optimal topology for wireless sensor networks. The cluster heads election and member nodes attribution are considered as an overall problem and are optimized simultaneously. Simulation results show that the DPSO-based clustering routing has stronger ability to balance energy consumption among sensor nodes in EH-WSNs and increases the network throughput by 15% than sLEACH.

关键词： Routing Clustering algorithms Wireless sensor networks Energy harvesting Algorithm design and analysis Optimization Routing protocols

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Investigation of spatial sharing enhancement in multi-hop 60GHz mmWave WPANs

Investigation of spatial sharing enhancement in multi-hop 60...

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

作者： Ran Cai Danpu Liu Fangfang Yin Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications P.R. China

Spatial sharing (SPSH) is one of the most important merits in 60 GHz millimeter wave (mmWave) wireless personal area networks. Multihop architecture exhibits significant potential for concurrent transmission. In this study, we investigate the SPSH problem for single-hop and multihop architecture under the physical interference model. The minimum length schedule problem of satisfying the required traffic demand with the shortest time is formulated as the optimization problem. Concurrent scheduling and routing are jointly considered in the multihop case. To reduce the complexity of the computation, the column generation algorithm is employed to derive the optimal solution. The simulation results show that multihop architecture can enhance the network throughput by 20% to 30% compared with single-hop architecture.

关键词： Interference Wireless personal area networks Relays Schedules Gain Spread spectrum communication Receivers

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A QoE-Driven Cross-Layer Resource Allocation Scheme for High Traffic Services over Open Wireless network Downlink

A QoE-Driven Cross-Layer Resource Allocation Scheme for High...

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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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SDN-based energy-saving scheme for fiber-wireless network

SDN-based energy-saving scheme for fiber-wireless network

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11th International Conference on Wireless Communications, networking and Mobile Computing (WiCOM 2015)

作者： Shuai Li Guochu Shou Yihong Hu Zhigang Guo Beijing Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications 100876 China

ISBN: (纸本)9781510821279

With the development of Mobile Internet and the rapid growth of mobile social communication and mobile video, the network scale has been growing rapidly and the energy consumption is too huge to be ignored. Current estimates indicate that Information and Communication Technology (ICT) is responsible for a fraction of the global energy consumption ranging between 1% and 2%, among which, the consumption in access network is a major component. Currently Fiber-Wireless (FiWi) access network, combining the flexibility, ubiquity and mobility of wireless access network with robustness and high capacity support of the optical access network, is one of the research hotspots. In this paper, combining with the OpenFlow technology in Software Define network (SDN), we propose a SDN-based energy-saving scheme for FiWi access network, which implements the energy-saving from the global perspective. Simulation results have showed that the proposed energysaving scheme can gain more effective energy-saving, which proves its validity and offer a reference for research and implementation of future integrated networks.

关键词： Controller Energy-Efficiency Energy-Saving Fiber-Wireless networks SDN Energy efficiency access network energy saving Controllers Wireless networks energy consumption Scheme Information and communication technology mobile Internet

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An implementation of multi-domain Software Defined networking

An implementation of multi-domain Software Defined Networkin...

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11th International Conference on Wireless Communications, networking and Mobile Computing (WiCOM 2015)

作者： Zhengxin Guo Yihong Hu Guochu Shou Zhigang Guo Beijing Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications 100876 China

ISBN: (纸本)9781510821279

Software Defined network (SDN) is an emerging architecture which can simplify network management and enable innovation through network programmability by decoupling the control plan and the data plan of the network. However, traditional SDN architecture is not suitable for all cases; a single controller may become a performance bottleneck in a wide area network. While current multiple controller solutions always make the network more complex and harder to be managed than traditional SDN network. In this paper, we proposed a new architecture for multi-domain software defined networks, which divided the control platform into two layers vertically. The bottom layer consists of local controllers, which only has the knowledge of the local domain it controls. And the top layer is coordinating controller controlling all local controllers. The communications between local controllers and coordinating controller use a standard NBI as communication protocol which is also the protocol used when controllers (both local controllers and coordinate controllers) communicate with applications. We implemented the architecture and our evaluations show the feasibility of it.

关键词： Coordinating Controller Implementation and Evaluation Multi-Domain North-Bound Interface SDN local controller Controllers CONSOLE top layer Wide area networks Building construction architecture Communication protocols new buildings network management networking computer software network

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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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