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Data Compression Conference (DCC)

作者： Sartipi, Mina Fletcher, Robert Univ Tennessee Chattanooga Dept Comp Sci & Engn Chattanooga TN 37403 USA

ISBN: (纸本)9780769543529

In this paper, we study the problem of data acquisition in wireless sensor networks (WSNs). A recently revitalized technique called compressive sensing (CS) has presented a new method to capture sparse signals at a rate below Nyquist. There are drawbacks to directly applying the existing CS algorithm to WSNs, which are mainly due to the fact that CS requires a large number of inter-communications for generating each projection. To mitigate these drawbacks, we propose compressive distributed sensing using random walk (CDS(RW)), an algorithm for CS in WSNs that uses rateless coding. This algorithm is independent of routing algorithms and network topologies. CDS(RW) collects sufficient number of sensor readings while combining them together without significantly increasing the inter-communication cost. We model the CS problem with code design for a set of parallel channels which helps us to design the rateless code degree distribution. This model provides the advantage of using non-uniform and unequal error protection codes.

关键词： Belief Propagation Compressive Sensing Random Walk Rateless Code Compressed sensing Random walk Belief propagation Data Collection Methods Wireless sensor networks CONTAINMENT SPRAY carbon monosulfide Cesium error protection conditioned stimulus routing algorithms

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An Impairment-aware Virtual Optical Network Composition Mechanism for Future Internet

An Impairment-aware Virtual Optical Network Composition Mech...

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37th European Conference and Exhibition on Optical Communication (ECOC)

作者： Peng, Shuping Nejabati, Reza Azodolmolky, Siamak Escalona, Eduard Simeonidou, Dimitra Univ Essex Sch Comp Sci & Elect Engn High Performance Networks Grp Wivenhoe Pk Colchester CO4 3SQ Essex England

A new impairment-aware infrastructure as a service architecture enabled by optical network virtualization is proposed. A novel impairment-aware virtual optical network composition mechanism for this architecture is pr... 详细信息

ISBN: (纸本)9781457719189

关键词： Network topology Optical network architecture Optical networks Q factor routing algorithms Wavelength assignment Networks (060.4250) Optical communications (060.4510)

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Exploiting Traffic Dynamics in Power-Aware Logical Topology Design

Exploiting Traffic Dynamics in Power-Aware Logical Topology ...

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37th European Conference and Exhibition on Optical Communication (ECOC)

作者： Bonetto, Edoardo Chiaraviglio, Luca Cuda, Davide Idzikowski, Filip Neri, Fabio Politecn Torino Corso Duca Abruzzi 24 I-10129 Turin Italy Orange Labs 38 Rue Gen Leclerc F-92794 Issy Les Moulineaux France Tech Univ Berlin TKN Einsteinufer 25 D-10587 Berlin Germany

We propose the Multi-Period Power-Aware Logical Topology Design. We compared two different heuristics and show that exploiting the day-night fluctuations of the traffic can lead to significant power savings at a low r... 详细信息

ISBN: (纸本)9781457719189

关键词： Genetic algorithms Networking hardware Optical networks routing algorithms Wavelength assignment Wavelength routing Networks (060.4250) Networks, wavelength routing (060.4265)

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Efficient Online Estimation of Bursty Wireless Links

Efficient Online Estimation of Bursty Wireless Links

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16th IEEE Symposium on Computers and Communications (lSCC)

作者： Alizai, Muhammad Hamad Wirtz, Hanno Kunz, Georg Grap, Benjamin Wehrle, Klaus Rhein Westfal TH Aachen Aachen Germany

ISBN: (纸本)9781457706783

Rapidly changing link conditions make it difficult to accurately estimate the quality of wireless links and predict the fate of future transmissions. In particular bursty links pose a major challenge to online link estimation due to strong fluctuations in their transmission success rates at short time scales. Therefore, the prevalent approach in routing algorithms is to employ a long term link estimator that selects only consistently stable links - PRR > 90% - for packet transmissions. The use of bursty links is thus disregarded although these links provide considerable additional resources for the routing process. Based on significant empirical evidence of over 100,000 transmissions over each link in widely used 802.15.4 and 802.11 testbeds, we propose two metrics, Expected Future Transmissions (EFT) and MAC(3), for runtime estimation of bursty wireless links. We introduce the Bursty Link Estimator (BLE) that, based on these two metrics, accurately estimates bursty links in the network rendering them available for packet transmissions.

关键词： BLE EFT Estimation History IEEE 802.11 testbeds IEEE 802.15.4 Measurement routing Runtime Wireless communication Wireless sensor networks bursty link estimator bursty wireless links expected future transmission online estimation packet transmissions radio links routing algorithms telecommunication network routing

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Enhancing AODV routing protocol over mobile ad hoc sensor networks

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INTERNATIONAL JOURNAL OF SENSOR NETWORKS 2011年第1-2期10卷 36-41页

作者： Soliman, Hamdy Al-Otaibi, Mohammad New Mexico Inst Min & Technol Dept Comp Sci & Engn Socorro NM 87801 USA

In this paper, we efficiently adapt the prominent Ad hoc On-demand Distance Vector (AODV) routing protocol with a reactive Local Link Repair (AODV-LR) for effective deployment in Mobile Ad hoc Sensor Networks (MASNETs) with restricted power and bandwidth. We introduce two replacement mechanisms to the local repair phase of the AODV. Our new approaches are self-repairing AODV algorithms called Reactive Self-repairing AODV (AODV-RSR) and Pre-emptive Self-repairing AODV (AODV-PSR). These two algorithms are able to find an alternative route to a failing link without depending only on broadcasting Route Request (RREQ) packets. Experimental results show that the new algorithms achieve better performance than the AODV-LR and Self-repair Algorithm (SRAODV) by obtaining lower packet delay, higher packet delivery ratio and lower control message overhead.

关键词： routing algorithms computer network performance AODV AODV-RSR AODV-PSR SRAODV

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On the Physical Impairments Constraint in OBS Networks

On the Physical Impairments Constraint in OBS Networks

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12th International Conference on Transparent Optical Networks (ICTON)

作者： Pedrola, Oscar Careglio, Davide Klinkowski, Miroslaw Sole-Pareta, Josep Univ Politecn Cataluna CCABA ES-08034 Barcelona Spain Inst Natl Telecommun Wroclaw Poland

ISBN: (纸本)9781424477982

The introduction of sub-wavelength switching is one of the main objectives of the future transparent optical mesh networks. One strong candidate is Optical Burst Switching (OBS) which improves the resource utilisation by setting up very short lived circuits (bursts). Nonetheless, introducing optical transparency in the optical layer has an important impact on the network performance. In fact, the signal propagates through a transparent optical path accumulates the effect of a variety of quality degrading phenomena which limits the system reach. Translucent optical networks are emerging as a promising solution for bridging the gap between opaque and transparent networks. In this paper we investigate these alternatives in OBS networks and test the effectiveness of the translucent solution.

关键词： Optical Burst Switching physical layer impairments routing algorithms regenerator placement

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Energetic sustainability of routing algorithms for energy-harvesting wireless sensor networks

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COMPUTER COMMUNICATIONS 2007年第14-15期30卷 2976-2986页

作者： Lattanzi, Ernanuele Regini, Edoardo Acquaviva, Andrea Bogliolo, Alessandro Univ Urbino Informat Sci & Technol Inst I-61029 Urbino Italy

A new class of wireless sensor networks that harvest power from the environment is emerging because of its intrinsic capability of providing unbounded lifetime. While a lot of research has been focused on energy-aware routing schemes tailored to battery-operated networks, the problem of optimal routing for energy harvesting wireless sensor networks (EH-WSNs) has never been explored. The objective of routing optimization in this context is not extending network lifetime, but maximizing the workload that can be autonomously sustained by the network. In this work we present a methodology for assessing the energy efficiency of routing algorithms for networks whose nodes drain power from the environment. We first introduce the energetic sustainability problem, then we define the maximum energetically sustainable workload (MESW) as the objective function to be used to drive the optimization of routing algorithms for EH-WSNs. We propose a methodology that makes use of graph algorithms and network simulations for evaluating the MESW starting from a network topology, a routing algorithm and a distribution of the environmental power available at each node. We present a tool flow implementing the proposed methodology and we show comparative results achieved on several routing algorithms. Experimental results highlight that routing strategies that do not take into account environmental power do not provide optimal results in terms of workload sustainability. Using optimal routing algorithms may lead to sizeable enhancements of the maximum sustainable workload. Moreover, optimality strongly depends on environmental power configurations. Since environmental power sources change over time, our results prompt for a new class of routing algorithms for EH-WSNs that are able to dynamically adapt to time-varying environmental conditions. (C) 2007 Elsevier B.V. All rights reserved.

关键词： wireless sensor networks energy harvesting routing algorithms

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Integrated hybrid optical node using dynamic reconfiguration and routing algorithms for bimodal traffic

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JOURNAL OF OPTICAL NETWORKING 2007年第10期6卷 1191-1209页

作者： Okorafor, Ekpe Texas A&M Univ College Stn TX 77845 USA

I propose an integrated hybrid optical node ( i-HON) architecture that is designed to combine both packet-switched and circuit-switched data in an effective manner to maximize link utilization, minimize communication latencies, and improve overall performance. I demonstrate the feasibility of i-HON by proposing a single wavelength optical header encoder and self-routing binary-encoded optical header address processing. I then develop dynamic hybrid routing heuristics and adapt these to the novel dynamic reconfiguration and routing algorithms suited for asynchronous bufferless optical networks that incorporate optical routing logic. I compare the performance of the presented algorithms. I use simulation results to show that i-HON provides overall system throughput performance improvements of up to 40% with similar to 50% reduction in network latency. (c) 2007 Optical Society of America.

关键词： Circuit switched networks Optical network architecture Optical networks Packet switching routing algorithms Wavelength routing

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Design of a reconfigurable pipelined switch for faulty on-chip networks

Design of a reconfigurable pipelined switch for faulty on-ch...

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10th IASTED International Conference on Parallel and Distributed Computing and Networks, PDCN 2011

作者： Chi, Hsin-Chou Chang, Tat-Seng Department of Computer Science and Information Engineering National Dong Hwa University Hualien Taiwan

ISBN: (纸本)9780889868649

Network-on-chip (NoC) architectures have been recently proposed as the communication framework for large-scale chips. The design of the routing system for the packet-switched on-chip network is one of the critical issues for the success of NoC architectures. In this paper, we present the design of a reconfigurable pipelined switch for mesh on-chip networks. When the switch is in the regular mode for the regular mesh, the routing is equivalent to the XY routing. When there are faulty links or switches, the switch is reconfigured in irregular mode for faulty mesh networks. The routing decision hardware in the switch is efficiently implemented based on a simple distance calculation algorithm. Our switch design is validated by implementation of four different versions with 64-bit, 128-bit, 256-bit, and 512-bit links, respectively. Our results show that our routing decision can be efficiently realized with distance calculation hardware.

关键词： routing algorithms

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Analysis of greedy forwarding in vehicular ad hoc networks

Analysis of greedy forwarding in vehicular ad hoc networks

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2011 International Conference on System Science, Engineering Design and Manufacturing Informatization, ICSEM 2011

作者： Li, Yuanzhen Xie, Shengxian Yu, Yiqiao School of Computer Science Liaocheng University Shandong Liaocheng 252059 China

ISBN: (纸本)9781457702471

In recent years, there is a growing interest on the research and deployment of MANET(Mobile Ad Hoc Networks) technology for vehicular communication. routing is crucial to the success of VANET(Vehicular Ad hoc Networks) applications, which is complicated by the fact that VANETs are highly mobile, and sometimes partitioned. Greedy forwarding is a primary and critical routing strategy for Vehicular Ad Hoc Networks. This paper proposed an analysis of the greedy forwarding routing protocol for Vehicular Ad Hoc Networks which is very important to improve the performance of greedy forwarding. And this paper is one beneficial and important component of the greedy forwarding routing protocol in Vehicular Ad Hoc Networks. Finally the analysis is validated by comparing simulation and analysis result. © 2011 IEEE.

关键词： routing algorithms

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