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检索条件"任意字段=Conference on Scalability and Traffic Control in IP Networks"

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An approach towards improved energy-efficiency in wireless sensor nets

An approach towards improved energy-efficiency in wireless s...

引用

IEEE Radio and Wireless Symposium (RWS formerly RAWCON)

作者： S. Raghuwanshi A. Mishra Wireless Internet Networking Group Bradley Department of Electrical and Computer Engineering Virginia Technology Blacksburg USA

Wireless sensor networks (WSNs) are made up of sensor nodes that can only be equipped with limited energy resources, but can still be used over an extensive set of diverse applications. The traffic inherent to WSNs is however, variable and highly correlated. We analyze the energy-efficiency with the varying traffic in such networks. We expect sensor nodes to save more energy by using an adaptive scheme for varying traffic conditions giving robustness to different application scenarios. A random timing scheme for optimizing the radio on/off time-interval by adapting to traffic loads is discussed. The discussion in this paper aims to produce a reliable energy-aware sensing network, in spite of node failures, minimizing energy consumption at the same time.

关键词： Energy efficiency Wireless sensor networks traffic control Telecommunication traffic Energy consumption Robustness Media Access Protocol Intelligent networks ip networks Energy resources

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Statistical per-flow service bounds in a network with aggregate provisioning

Statistical per-flow service bounds in a network with aggreg...

引用

IEEE Annual Joint conference: INFOCOM, IEEE Computer and Communications Societies

作者： J. Liebeherr S.D. Patek A. Burchard Department of Computer Science University of Virginia USA Department of Systems and Information Engineering University of Virginia USA Department of Mathematics University of Virginia USA

scalability concerns of QoS implementations have stipulated service architectures where QoS is not provisioned separately to each flow, but instead to aggregates of flows. This paper determines stochastic bounds for the service experienced by a single flow when resources are managed for aggregates of flows and when the scheduling algorithms used in the network are not known. Using a recently developed statistical network calculus, per-flow bounds can be calculated for backlog, delay, and the burstiness of output traffic.

关键词： Intelligent networks Aggregates Scheduling algorithm Telecommunication traffic Switches scalability Calculus Communication system traffic control Fluid flow measurement Computer science

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Flow level simulation of large ip networks

Flow level simulation of large IP networks

引用

IEEE Annual Joint conference: INFOCOM, IEEE Computer and Communications Societies

作者： F. Baccelli D. Hong INRIA/ENS Paris France

The aim of this paper is to simulate the interaction of a large number of TCP controlled flows and UDP flows sharing many routers/links, from the knowledge of the network parameters (capacity, buffer size, topology, scheduling) and of the characteristics of each TCP (RTT, route etc.) and UDP flow. This work is based on the description via some fluid evolution equations, of the joint evolution of the window sizes of all flows over a single bottleneck router/link, as function of the synchronization rate. It is shown that the generalization of this fluid dynamics to a network composed of several routers can be described via equations allowing one to simulate the interaction of e.g. millions of TCP flows on networks composed of tens of thousands of links and routers on a standard workstation. The main output of the simulator are the mean value and the fluctuations of the throughput obtained by each flow, the localization of the bottleneck routers/links, the losses on each of them and the time evolution of aggregated input traffic at each router or link. The method is validated against NS simulations. We show that several important statistical properties of TCP traffic which were identified on traces are also present on traffic generated by our simulator: for instance, aggregated traffic generated by this representation exhibits the same short time scale statistical properties as those observed on real traces. Similarly, the experimental laws describing the fairness of the bandwidth sharing operated by TCP over a large network are also observed on the simulations.

关键词： ip networks traffic control TCPip Equations Telecommunication traffic Fluid flow control Size control Network topology Fluid dynamics Workstations

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A new differentiated service model paradigm via explicit endpoint admission control

A new differentiated service model paradigm via explicit end...

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IEEE Symposium on Computers and Communications (ISCC)

作者： Jie Yang Jian Ye S. Papavassiliou New Jersey Center for Wireless Networking and Internet Security Department of Electrical and Computer Engineering New Jersey Institute of Technology University Heights NJ USA

In this paper we propose a scalable differentiated service model paradigm to provide fine QoS granularity in Internet via the framework of a distributed admission control scheme referred to as explicit endpoint admission control (EEAC). Specifically, in the proposed EEAC scheme the end host sends out probing packet to the network and makes admission decision according to the probing results that are explicitly provided at each router along the path. By introducing the concept of service vector, the proposed service model paradigm allows users to choose different services at different nodes along the path from the source to the destination to achieve fine QoS granularity and architectural scalability. Models for both users and network service providers to maximize their benefits are also discussed in this paper. The corresponding simulation results demonstrate that the new service model paradigm and EEAC scheme can result in lower request drop ratio, satisfactory end-to-end performance, and lower cost for each user.

关键词： Admission control Quality of service scalability Diffserv networks Web and internet services ip networks traffic control Communication system security Computer security Costs

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History-based adaptive QoS provisioning in mobile ip networks

History-based adaptive QoS provisioning in mobile IP network...

引用

IEEE conference and Exhibition on Global Telecommunications (GLOBECOM)

作者： J.M. Moon M.Y. Yun Y.J. Kim S.H. Kim Wireless System Research Department Electronics and Telecommnications Research Institute Daejeon South Korea Department of Computer Science Chungnam National University Daejeon South Korea

We propose an admission control scheme for guaranteeing the mobile QoS in mobile ip networks. The proposed scheme considers the tunnel reservation for keeping handoff dropping probability below predefined values. It reserves resources dynamically by estimating the number of mobile users and mobility features in each mobility agent. We propose mobility entities that depict mobility features and the history which has statistical mobility information in each mobility agent. We describe the requirements for macro mobility considerations and prove that our scheme satisfies them. With the mobility entities and the history, our scheme makes a history tuple to predict a mobility feature of the next time. It can be applied to a real world, because it reflects mobility features of each mobility agent to measure and analysis mobility entities. It provides an adaptive reservation scheme which allocates additional resources depending on a measured handoff dropping probability even if a handoff probability is changed unexpectedly.

关键词： Intelligent networks ip networks Mobile computing Resource management Admission control History scalability Programmable control Adaptive control Computer science

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Optimization of handover margins in GSM/GPRS networks

Optimization of handover margins in GSM/GPRS networks

引用

IEEE conference on Vehicular Technology (VTC)

作者： M. Toril S. Pedraza R. Ferrer V. Wille Department Ingenìería de Comunicaciones Universidad de Málaga Malaga Spain Nokia Networks IP Mobility Networks NSR-Málaga SCT Edif. Institute Universitarios Malaga Spain

Optimization of handover boundaries has been suggested to cope with non-homogeneous traffic distribution in GSM/GPRS networks. In this paper, an automatic optimization algorithm is proposed, which is able to maximize the overall traffic carried in the network by equalizing long-term blocking effects. Field trial results indicate that system capacity can be significantly improved with respect to homogeneous handover parameter settings.

关键词： Intelligent networks GSM Ground penetrating radar Telecommunication traffic traffic control Land mobile radio cellular systems Electronic mail System performance Analytical models Resource management

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Centralized peer-to-peer streaming with layered video

Centralized peer-to-peer streaming with layered video

引用

IEEE International conference on Multimedia and Expo (ICME)

作者： I. Lee Ling Guan School of Electrical and Information Engineering University of Sydney Sydney NSW Australia Department of Electrical and Computer Engineering Ryerson University Toronto ONT Canada

Faster computational power and higher network bandwidth facilitates Internet applications to improve the way we live, work and play. For video streaming applications, it is a challenge to provide the scalability while maintaining the central manageability and the robustness. In this paper, we propose the centralized peer-to-peer streaming protocol (P2PSP), which features the centralized management, guaranteed perceived quality of service (PQoS), while decentralized the traffic loads. To evaluate the protocol, a layered video coding technique based on 3D discrete cosine transform (DCT) is designed. This codec applies self-organizing tree map (SOTM) to generate cascaded vector quantization codebooks. We demonstrate the effectiveness of the centralized P2PSP by comparing the video streaming simulations under the proposed architecture and the client/server architecture.

关键词： Peer to peer computing Streaming media Protocols Discrete cosine transforms Computer networks Bandwidth ip networks scalability Robustness Quality management

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Speculative routing and update propagation: a kundali centric approach

Speculative routing and update propagation: a kundali centri...

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IEEE International conference on Communications (ICC)

作者： A. Mohan V. Kalogeraki Department of Computer Science Brown University Providence RI USA Department of Computer Science and Engineering University of California Riverside CA USA

Peer-to-peer networks have gained much attention due to their attractive features of self-organization, scalability and decentralized control. The key challenge in these networks is how to efficiently locate and retrieve the correct data. In this paper, we propose propagation and routing algorithms for a fully decentralized, self-organizing network. Our goal is to maximize the probability of finding the data, minimize peer access latencies and balance the workload among many peers. Central to our approach is the Kundali data structure that represents the set of data maintained by the peers and drives the smart routing of the search requests (queries). We have implemented our algorithms in the context of a fully decentralized Internet caching service in our internal network. Our mechanism is inexpensive, highly scalable, and resilient to node failures and with low administration cost. Experimental results validate or algorithms and show that they have good performance results.

关键词： Routing Peer to peer computing scalability Distributed control Information retrieval Self-organizing networks Delay Data structures Context-aware services ip networks

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The role of ad hoc networking in future wireless communications

The role of ad hoc networking in future wireless communicati...

引用

International conference on Communication Technology (ICCT)

作者： Bangnan Xu S. Hischke B. Walke Technologiezentrum T-Systems Darmstadt Germany Communication Networks RWTH Aachen University of Technology Aachen Germany

This paper discusses the role of ad hoc networking in future wireless communications. Ad hoc networks are classified as isolated ad hoc networks with large and small sizes, integrated ad hoc networks in various scenarios and cellular ad hoc networks for the future mobile access networks. The very low traffic performance of large-scale ad hoc networks is shown by simulation results, indicating such a king of networks having little commercial potential. Small size ad hoc networks seem to be ubiquitous because of the availability of cheap wireless LAN technologies. Integration of small size ad hoc networks with the global Internet can be realized by ad hoc gateways, which are proposed in this paper. In contrast to large scale isolated ad hoc networks, traffic performance of a cellular ad hoc network is very promising, indicating that cellular ad hoc networking seems to be a promising solution to fulfill the requirements of future wireless communication systems.

关键词： Wireless communication Ad hoc networks Cellular networks Telecommunication traffic Large-scale systems traffic control Availability Wireless LAN Isolation technology ip networks

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QoS routing algorithms under inaccurate routing for bandwidth constrained applications

QoS routing algorithms under inaccurate routing for bandwidt...

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IEEE International conference on Communications (ICC)

作者： X. Masip-Bruin S. Sanchez-Lopez J. Sole-Pareta J. Domingo-Pascual Departament d'Arquitectura de Computadors Universitat Poliltècnica de Catalunya Catalonia Spain

Multiprotocol label switching and traffic engineering are proposed by the IETF to improve the network performance. Moreover, some QoS routing algorithms must be added in order to optimize the path selection process. However, in highly dynamic large networks, existing QoS routing algorithms suffer from a blocking probability, which in part is due to the existence of inaccuracy in the network state information used to select the path. This paper deals with the BYPASS based routing mechanism, which was introduced in the previous paper to overcome this routing inaccuracy effect in ip/MPLS scenarios. We suggest an enhancement of the BBR mechanism to optimize the bandwidth allocation by balancing the path length and the residual bandwidth, and its performance is evaluated by simulation.

关键词： Bandwidth Multiprotocol label switching Telecommunication traffic Routing protocols Databases Contracts Councils Channel allocation ip networks traffic control

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