2007 3rd International Conference on Testbeds and Research Infrastructure for the Development of Networks and Communities最新文献_第2页

Efficient Parallel Simulation of Mobile Wireless Networks by Run-time Prediction of Multi-hop Propagation Delay 基于多跳传播延迟运行时预测的移动无线网络高效并行仿真

2007 3rd International Conference on Testbeds and Research Infrastructure for the Development of Networks and Communities Pub Date : 2007-05-21 DOI: 10.1109/TRIDENTCOM.2007.4444664

H. Yamaguchi, K. Konishi, T. Higashino

{"title":"Efficient Parallel Simulation of Mobile Wireless Networks by Run-time Prediction of Multi-hop Propagation Delay","authors":"H. Yamaguchi, K. Konishi, T. Higashino","doi":"10.1109/TRIDENTCOM.2007.4444664","DOIUrl":"https://doi.org/10.1109/TRIDENTCOM.2007.4444664","url":null,"abstract":"In this paper, we propose a method to improve the performance of parallel and distributed simulation of multi-hop mobile wireless networks. We assume that the simulation field is divided into several pieces and is simulated by multiple parallel processes which synchronize conservatively, i.e., without violation of causality. The basic idea of our approach is to predict the lower bounds of timestamps of \"potential\" upcoming events which cause inter-process messages based on the timestamps of the currently scheduled events plus minimum multi-hop propagation delay estimated in run-time. By this prediction method, we are able to enlarge the lookahead of parallel processes, and their concurrency can be enhanced. We have implemented the parallel and distributed version of our network simulator MobiREAL, and have also implemented this mechanism. The experimental results have shown that we could achieve 50% speed up in average compared with the version using static lookahead in the simulation of end-to-end communications over 1,200 nodes.","PeriodicalId":397239,"journal":{"name":"2007 3rd International Conference on Testbeds and Research Infrastructure for the Development of Networks and Communities","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121648525","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 4

MagNets - experiences from deploying a joint research-operational next-generation wireless access network testbed magnet——部署联合研究-操作下一代无线接入网络试验台的经验

2007 3rd International Conference on Testbeds and Research Infrastructure for the Development of Networks and Communities Pub Date : 2007-05-21 DOI: 10.1109/TRIDENTCOM.2007.4444714

R. Karrer, I. Matyasovszki, A. Botta, A. Pescapé

引用次数: 52

Emulating Dynamic Topologies for Repeatable Experiments with Mobile Ad Hoc Networks 移动自组织网络可重复实验的动态拓扑仿真

2007 3rd International Conference on Testbeds and Research Infrastructure for the Development of Networks and Communities Pub Date : 2007-05-21 DOI: 10.1109/TRIDENTCOM.2007.4444711

S. Midkiff, L. Dasilva, G. Hadjichristofi, Tao Lin, Jahng S. Park

引用次数: 0

Integrating multiuser dynamic OFDMA into IEEE 802.11a and prototyping it on a real-time software-defined radio testbed 将多用户动态OFDMA集成到IEEE 802.11a中，并在实时软件定义无线电试验台上进行原型设计

2007 3rd International Conference on Testbeds and Research Infrastructure for the Development of Networks and Communities Pub Date : 2007-05-21 DOI: 10.1109/TRIDENTCOM.2007.4444671

H. Lichte, S. Valentin, Falk Eitzen, M. Stege, C. Unger, H. Karl

{"title":"Integrating multiuser dynamic OFDMA into IEEE 802.11a and prototyping it on a real-time software-defined radio testbed","authors":"H. Lichte, S. Valentin, Falk Eitzen, M. Stege, C. Unger, H. Karl","doi":"10.1109/TRIDENTCOM.2007.4444671","DOIUrl":"https://doi.org/10.1109/TRIDENTCOM.2007.4444671","url":null,"abstract":"Multiuser dynamic orthogonal frequency division multiple access (OFDMA) can achieve high downlink capacities in future wireless networks by optimizing the subcarrier allocation for each user. When it comes to the integration into current wireless local area network (WLAN) standards, dynamic OFDMA raises several implementation issues which are neglected in theoretical papers. Putting this emerging approach into practice requires to treat these issues accordingly and to demonstrate the feasibility of the system design. In this paper, we propose a dynamic OFDMA integration for the physical layer of the widespread IEEE 802.11a standard. To test our implementation and demonstrate its practical relevance we use a pragmatic approach: We prototype multiuser dynamic OFDMA on a real-time software-defined radio testbed for WLANs. We discuss details of our implementation and provide measurements showing that it does not introduce significant overhead into the IEEE 802.11a system at high subcarrier allocation quality. We particularly focus on the problems of our integration as well as the concepts and limitations of the used testbed.","PeriodicalId":397239,"journal":{"name":"2007 3rd International Conference on Testbeds and Research Infrastructure for the Development of Networks and Communities","volume":"62 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133637051","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 16

SWARMS: A Sensornet Wide Area Remote Management System 蜂群:传感器广域远程管理系统

2007 3rd International Conference on Testbeds and Research Infrastructure for the Development of Networks and Communities Pub Date : 2007-05-21 DOI: 10.1109/TRIDENTCOM.2007.4444657

Charles Gruenwald, Anders Hustvedt, Aaron Beach, Richard Han

引用次数: 11

Clock Synchronisation in Industry-standard Computer Hardware 工业标准计算机硬件中的时钟同步

2007 3rd International Conference on Testbeds and Research Infrastructure for the Development of Networks and Communities Pub Date : 2007-05-21 DOI: 10.1109/TRIDENTCOM.2007.4444668

M. Peuhkuri, A. Gröhn, Oskari Simola

引用次数: 1

Configuring a Lab to Support Community-Based Security Audit Projects 配置实验室以支持基于社区的安全审计项目

2007 3rd International Conference on Testbeds and Research Infrastructure for the Development of Networks and Communities Pub Date : 2007-05-21 DOI: 10.1109/TRIDENTCOM.2007.4444679

A. Holland, S. Lincke

引用次数: 1

A File System Abstraction and Shell Interface for a Wireless Sensor Network Testbed 无线传感器网络试验台的文件系统抽象与Shell接口

2007 3rd International Conference on Testbeds and Research Infrastructure for the Development of Networks and Communities Pub Date : 2007-05-21 DOI: 10.1109/TRIDENTCOM.2007.4444658

Andrew R. Dalton, J. Hallstrom

{"title":"A File System Abstraction and Shell Interface for a Wireless Sensor Network Testbed","authors":"Andrew R. Dalton, J. Hallstrom","doi":"10.1109/TRIDENTCOM.2007.4444658","DOIUrl":"https://doi.org/10.1109/TRIDENTCOM.2007.4444658","url":null,"abstract":"Despite tremendous research interest and increased adoption, deeply embedded sensor networks are difficult to design, debug, and deploy; ultra-dependability remains an elusive goal. To address these difficulties, we have previously presented an Interactive, server-centric testbed for wireless sensor networks that targets systems constructed using nesC and TinyOS - the emerging standard in sensor system development. The testbed infrastructure exposes an API suite that enables users to rapidly configure, instrument, compile, install, and profile their systems on one or more remote network deployments. The prototype deployment consists of 80 Tmote Sky devices arranged in a regular grid. The architecture is extensible in both the hardware and software dimensions to foster adoption and specialization. In this paper, we demonstrate the extensibility of the testbed software design, and present a novel file system abstraction and shell interface developed using the original API suite. The design of the new interface is informed by user feedback from client institutions where the standard graphical interface is being used to support research and teaching activities. The new shell interface complements the traditional graphical interface, reducing interaction latency, and enabling programmatic experimentation through an interpreted scripting facility. We present the design and implementation of the new testbed interface, and present a small, but representative case-study that illustrates its utility.","PeriodicalId":397239,"journal":{"name":"2007 3rd International Conference on Testbeds and Research Infrastructure for the Development of Networks and Communities","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129246210","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 10

Dynamic Optimal Fragmentation for Goodput Enhancement in WLANs 无线局域网中Goodput增强的动态最优分片

2007 3rd International Conference on Testbeds and Research Infrastructure for the Development of Networks and Communities Pub Date : 2007-05-21 DOI: 10.1109/TRIDENTCOM.2007.4444673

Yusun Chang, Christopher P. Lee, Bongkyoung Kwon, J. Copeland

{"title":"Dynamic Optimal Fragmentation for Goodput Enhancement in WLANs","authors":"Yusun Chang, Christopher P. Lee, Bongkyoung Kwon, J. Copeland","doi":"10.1109/TRIDENTCOM.2007.4444673","DOIUrl":"https://doi.org/10.1109/TRIDENTCOM.2007.4444673","url":null,"abstract":"To meet the demand for broadband wireless communication, wireless systems should work well in typical wireless environments, characterized by the path loss of the signals, multipath fading, interference to adjacent channels, and random errors. IEEE 802.11 VVLANs use the unlicensed 2.4 GHz industrial, scientific and medical (ISM) band, which is vulnerable to noise generated by TVs, microwaves, and cordless phones. This paper proposes an algorithm to enhance system goodput through the dynamic optimal fragmentation. The number of contending stations, packet collisions, packet error probabilities, and fragmentation overheads are modeled in the analysis. Using an adaptive SNR estimator, the sender estimates the SNR of the receiver, and chooses a fragmentation threshold to shape arbitrary sized packets into optimal length packets. Through the rigorous analysis and extensive experiments with implemented test-bed, we show that the dynamic optimal fragmentation enhances the goodput approximately 18% in a typical WLAN environment. The experiment results reinforce that the algorithm is a comprehensive analytical model applicable to any CSMA/CA based MAC protocol for next generation wireless networks, and a realistic approach that can be deployed without changing the IEEE802.11 MAC protocol.","PeriodicalId":397239,"journal":{"name":"2007 3rd International Conference on Testbeds and Research Infrastructure for the Development of Networks and Communities","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114778699","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 19

Integration of Open Source and Enterprise IP PBXs 开源IP pbx与企业IP pbx的集成

2007 3rd International Conference on Testbeds and Research Infrastructure for the Development of Networks and Communities Pub Date : 2007-05-21 DOI: 10.1109/TRIDENTCOM.2007.4444692

Krishna Sumanth Chava, J. Ilow

{"title":"Integration of Open Source and Enterprise IP PBXs","authors":"Krishna Sumanth Chava, J. Ilow","doi":"10.1109/TRIDENTCOM.2007.4444692","DOIUrl":"https://doi.org/10.1109/TRIDENTCOM.2007.4444692","url":null,"abstract":"Over the last few years, voice over Internet protocol (VoIP) evolved from enabling voice communications between computer terminals to providing much wider functionality of the public switched telephony network (PSTN). The idea of deploying VoIP in private branch exchanges (PBXs) is gaining credence among service providers, and this paper addresses some of the design issues related to an IP PBX implementation. Specifically, the paper explores the interoperability between Cisco call manager (CCM) and Linux-based asterisk PBXs corresponding to the enterprise-class and open source IP PBXs, respectively. The architecture of the networking testbed is documented for running various VoIP protocols between multi-vendor devices and IP PBXs. The results presented can be broadly defined into three areas of investigation: (i) the use of session initiation protocol (SIP) and inter asterisk exchange (IAX) trunks to integrate CCM to Asterisk PBXs and Asterisk to Asterisk PBXs, respectively; (ii) examining interoperability between the CCM and Asterisk PBX with advanced features like call display, voicemail, call detail records (CDR) and voicemail to e-mail transfer; and (iii) testing the resilience of voice quality against packet loss and delay in the open source PBX trunks with National Institute of Standards and Technology (NIST) network simulator.","PeriodicalId":397239,"journal":{"name":"2007 3rd International Conference on Testbeds and Research Infrastructure for the Development of Networks and Communities","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128053337","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 11