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On using grid of collocated APs to improve performance of wireless VoD systems 利用并置ap网格提高无线VoD系统的性能
International Latin American Networking Conference Pub Date : 2009-09-24 DOI: 10.1145/1636682.1636686
Leonardo Bidese de Pinho, C. Amorim
{"title":"On using grid of collocated APs to improve performance of wireless VoD systems","authors":"Leonardo Bidese de Pinho, C. Amorim","doi":"10.1145/1636682.1636686","DOIUrl":"https://doi.org/10.1145/1636682.1636686","url":null,"abstract":"In previous work we showed that Collocated Wireless Access Points coupled with appropriate management of their non-overlapping channels could be used for building Scalable Wireless Video-On-Demand (SWVoD) systems within a limited covered area. In this paper, we introduce the Grid of collocated Access Points or simply GAPS, a novel approach that uses clusters of Collocated Access Points as the basic blocks to efficiently build SWVoD systems for a wider covered area. In GAPS, each basic block is responsible for a distinct part of the covered area and the amount of APs per block can be set either statically or dynamically depending on the client concentration pattern (CCP). We present in details the framework of GAPS and report simulated performance results that indicated that GAPS could significantly decrease the blocking rate of video requests in comparison with previous design based on fixed distribution of basic blocks. In addition, GAPS had the advantage of sustaining the lower blockage rate over larger covered areas. Also, we showed that the higher setup cost of dynamic grids was fully compensated by handling changes on CCP much better than the static scheme so that GAPS could generate a higher monthly net income according to our cost metric.","PeriodicalId":415618,"journal":{"name":"International Latin American Networking Conference","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124428102","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: 0
GoalBit: the first free and open source peer-to-peer streaming network GoalBit:第一个免费和开源的点对点流媒体网络
International Latin American Networking Conference Pub Date : 2009-09-24 DOI: 10.1145/1636682.1636691
María Elisa Bertinat, Daniel De Vera, D. Padula, F. Robledo, P. Rodríguez-Bocca, P. Romero, G. Rubino
{"title":"GoalBit: the first free and open source peer-to-peer streaming network","authors":"María Elisa Bertinat, Daniel De Vera, D. Padula, F. Robledo, P. Rodríguez-Bocca, P. Romero, G. Rubino","doi":"10.1145/1636682.1636691","DOIUrl":"https://doi.org/10.1145/1636682.1636691","url":null,"abstract":"In this paper we present the GoalBit platform. GoalBit is the first open source peer-to-peer system for the distribution of real-time video streams through the Internet. The main advantage of a P2P architecture is the possibility of exploiting the available bandwidth unused by the set of user' hosts connected to the network. The main difficulty is that these hosts are typically highly dynamic, they continuously enter and leave the network. To deal with this problem, we use a mesh connectivity approach (bittorrent-like) where the stream is decomposed into several pieces sent by different peers to each client. Nowadays, the GoalBit platform is used by operators and by final users to broadcast their live contents. In this paper we explain by the first time the Goalbit architecture, its protocol, and how the content is packetized. To illustrate its potential, we present some empirical results measured in a popular final user channel, with more than 60 peers concurrently connected.","PeriodicalId":415618,"journal":{"name":"International Latin American Networking Conference","volume":"74 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124192518","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: 31
Early traffic classification using support vector machines 早期使用支持向量机的流量分类
International Latin American Networking Conference Pub Date : 2009-09-24 DOI: 10.1145/1636682.1636693
G. Sena, P. Belzarena
{"title":"Early traffic classification using support vector machines","authors":"G. Sena, P. Belzarena","doi":"10.1145/1636682.1636693","DOIUrl":"https://doi.org/10.1145/1636682.1636693","url":null,"abstract":"Internet traffic classification is an essential task for managing large networks. Network design, routing optimization, quality of service management, anomaly and intrusion detection tasks can be improved with a good knowledge of the traffic.\u0000 Traditional classification methods based on transport port analysis have become inappropriate for modern applications. Payload based analysis using pattern searching have privacy concerns and are usually slow and expensive in computational cost.\u0000 In recent years, traffic classification based on the statistical properties of flows has become a relevant topic. In this work we analyze the size of the firsts packets on both directions of a flow as a relevant statistical fingerprint. This fingerprint is enough for accurate traffic classification and so can be useful for early traffic identification in real time.\u0000 This work proposes the use of a supervised machine learning clustering method for traffic classification based on Support Vector Machines. We compare our method accuracy with a more classical centroid based approach, obtaining promising results.","PeriodicalId":415618,"journal":{"name":"International Latin American Networking Conference","volume":"256 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122291801","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: 33
A connection level model for IEEE 802.11 cells IEEE 802.11单元的连接级模型
International Latin American Networking Conference Pub Date : 2009-09-24 DOI: 10.1145/1636682.1636687
Andrés Ferragut, F. Paganini
{"title":"A connection level model for IEEE 802.11 cells","authors":"Andrés Ferragut, F. Paganini","doi":"10.1145/1636682.1636687","DOIUrl":"https://doi.org/10.1145/1636682.1636687","url":null,"abstract":"We study a wireless network under the 802.11 random access protocol, supporting multiple physical layer rates. Based on models for the effective packet rates achieved at the MAC layer, in both the downlink and uplink situations, we study the connection level dynamics. In particular, we study the Markov chain model that results from Poisson traffic being served by these MAC layer rates. For the downlink case, we show the equivalence of the model with a discriminatory processor sharing (DPS) queue, from which we derive stability conditions and study performance through the resulting connection level throughput. We also propose a variation of the flow scheduling policy at the access point that can result in a fairer allocation. For the uplink case, we derive stability conditions by identifying the asymptotic behavior of the chain with another DPS queue, and study its performance numerically. We validate the theory and cover other aspects neglected from the models, through ns2 packet simulations.","PeriodicalId":415618,"journal":{"name":"International Latin American Networking Conference","volume":"106 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122606091","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
MONTE: an implementation of an MPLS online traffic engineering tool MONTE: MPLS在线流量工程工具的实现
International Latin American Networking Conference Pub Date : 2009-09-24 DOI: 10.1145/1636682.1636694
Isabel Amigo, Bernardo Cabrera, Juan Schandy, P. Belzarena, Gabriel Gomez
{"title":"MONTE: an implementation of an MPLS online traffic engineering tool","authors":"Isabel Amigo, Bernardo Cabrera, Juan Schandy, P. Belzarena, Gabriel Gomez","doi":"10.1145/1636682.1636694","DOIUrl":"https://doi.org/10.1145/1636682.1636694","url":null,"abstract":"Multiservice networks require careful mapping of traffic in order to provide quality of service. Applying offline Traffic Engineering techniques leads to a better usage of resources and allows to assure some degree of quality of service. Even with those techniques applied, as network and traffic conditions change dynamically, the initial quality could be reduced. When addressing this problem, online Traffic Engineering has a major role. In MONTE project a solution for addressing this problem in Multiprotocol Label Switching networks was proposed and implemented in software. Such solution involves network discovering and monitoring, congestion detection, a corrective algorithm, and a mechanism for signalling changes in the network. The entire solution was conceived to work in real time and vendor independent. This paper explains the details of the solution and its implementation. Results validating the correct operation of the tool are also shown. This results were obtained through tests in a live network.","PeriodicalId":415618,"journal":{"name":"International Latin American Networking Conference","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121876997","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: 1
A new user behaviour model and QoE determination on short-message-service 一种新的短消息服务用户行为模型及QoE确定方法
International Latin American Networking Conference Pub Date : 2009-09-24 DOI: 10.1145/1636682.1636698
Marcelo Fiori, Julio Fitipaldo
{"title":"A new user behaviour model and QoE determination on short-message-service","authors":"Marcelo Fiori, Julio Fitipaldo","doi":"10.1145/1636682.1636698","DOIUrl":"https://doi.org/10.1145/1636682.1636698","url":null,"abstract":"This work proposes a method for end-to-end Quality of Experience determination for Short-Message-Service based on a new user behaviour modelling and end-to-end QoS measurements. The suggested model includes several relevant properties of SMS users behaviour that have not been considered in previous works, and improves Quality of Experience evaluation by distinguishing different behaviour states. The proposed method was implemented and has been tested for a period of time on a local operator network, proving that it is effective for QoE determination, providing consistent results, including reliable real time fault detection.","PeriodicalId":415618,"journal":{"name":"International Latin American Networking Conference","volume":"261 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128875224","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: 0
Securing wireless mesh networks: a winning combination of routing and forwarding mechanisms 保护无线网状网络:路由和转发机制的成功结合
International Latin American Networking Conference Pub Date : 2009-09-24 DOI: 10.1145/1636682.1636685
Viviane Lima, Vitor Ruivo, M. Curado
{"title":"Securing wireless mesh networks: a winning combination of routing and forwarding mechanisms","authors":"Viviane Lima, Vitor Ruivo, M. Curado","doi":"10.1145/1636682.1636685","DOIUrl":"https://doi.org/10.1145/1636682.1636685","url":null,"abstract":"The popularity and the constant improvement of wireless technologies, such as WiFi and WiMAX, have been increasing the usage and applicability of new networking schemes, including Wireless Mesh Networks (WMNs). WMNs are multi-hop wireless networks made by a collection of two types of nodes, mesh routers and mesh clients. Their self-organizing, self-configuring and self-healing proprieties, in conjunction with their low maintenance and implementation costs, make them especially appealing as a solution for Internet access and social networking. The characteristics of WMNs make them more susceptible to malicious attacks than traditional wired networks, namely the scarce bandwidth, the high level of interference, the shared transmission media and the limited physical security. Secure routing and forwarding schemes are a key component to guarantee secure communications in hostile environments. There are however issues that must be considered when developing secure routing and forwarding solutions, namely the overhead introduced by such approaches and the effectiveness of the prediction schemes used. This paper discusses the main solutions for routing security in WMNs and presents a thorough evaluation, comprising a novel way to characterize the effectiveness of such approaches. The evaluation is based on CONFIDANT, a secure routing protocol based on the DSR protocol. The study performed addresses both the issues aforementioned and provides insight on the trade-offs associated with the deployment of secure routing and forwarding mechanisms.","PeriodicalId":415618,"journal":{"name":"International Latin American Networking Conference","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129677494","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
Enhancements to the opinion model for video-telephony applications 增强视频电话应用的意见模型
International Latin American Networking Conference Pub Date : 2009-09-24 DOI: 10.1145/1636682.1636697
J. Joskowicz, J. López-Ardao
{"title":"Enhancements to the opinion model for video-telephony applications","authors":"J. Joskowicz, J. López-Ardao","doi":"10.1145/1636682.1636697","DOIUrl":"https://doi.org/10.1145/1636682.1636697","url":null,"abstract":"In this paper, we show how the proposed model in ITU-T Recommendation G.1070 \"Opinion model for video-telephony applications\" cannot model properly the perceptual video quality, especially in the low bit rate range, due to the great variation of MOS values depending on video content. In this work, we present different enhancements to the model, allowing a much better approximation to the perceptual MOS values, knowing only the subjective movement content in the video application, classified in \"Low\", \"Medium\" or \"High\". Studies were made for more than 1500 processed video clips, coded in MPEG-2 and H.264/AVC, in bit rate ranges from 50 kb/s to 12 Mb/s, in SD, VGA, CIF and QCIF display formats. Video clips subjective quality was estimated using one of the quality metrics standardized in ITU-T Recommendation J.144 and ITU-R Recommendation BT.1683.","PeriodicalId":415618,"journal":{"name":"International Latin American Networking Conference","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114331318","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: 129
Optimal wavelength converter allocation: a new approach based MOEA 波长转换器最佳分配:一种基于MOEA的新方法
International Latin American Networking Conference Pub Date : 2009-09-24 DOI: 10.1145/1636682.1636689
R. Maciel, Marco Sobrino, D. Pinto, B. Barán, C. Brizuela
{"title":"Optimal wavelength converter allocation: a new approach based MOEA","authors":"R. Maciel, Marco Sobrino, D. Pinto, B. Barán, C. Brizuela","doi":"10.1145/1636682.1636689","DOIUrl":"https://doi.org/10.1145/1636682.1636689","url":null,"abstract":"With the incorporation of the wavelength division multiplexing technology in optical networks, wavelength converters allocation has become a key strategy to minimize blocking probability. The optimal wavelength converter allocation (OWCA) problem has been treated partially as a single-objective problem minimizing the number of wavelength converters subject to blocking probability constrains or alternatively, minimizing the blocking probability subject to cost constrains. Both objective functions are in conflict. Therefore, this work proposes a multi-objective optimization approach, based on a multi-objective evolutionary algorithm (MOEA), where the blocking probability and the number of wavelength converters are simultaneously minimizing. Extensive simulations prove that the proposed approach obtains better experimental results than a state of the art alternative.","PeriodicalId":415618,"journal":{"name":"International Latin American Networking Conference","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134518527","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: 3
An approach for wireless sensor networks topology control in indoor scenarios 一种室内无线传感器网络拓扑控制方法
International Latin American Networking Conference Pub Date : 2009-09-24 DOI: 10.1145/1636682.1636684
S. Kostin, R. Salles, C. Amorim
{"title":"An approach for wireless sensor networks topology control in indoor scenarios","authors":"S. Kostin, R. Salles, C. Amorim","doi":"10.1145/1636682.1636684","DOIUrl":"https://doi.org/10.1145/1636682.1636684","url":null,"abstract":"This work presents a new approach for topology control (TC) in wireless sensor networks (WSN) devised for indoor scenarios with obstacles and no feedback mechanisms. The technique is supported by two novel metrics, namely Blockage Rate and Useful Area Rate, applicable to environments with well-defined obstacles described by Site Specific Propagation models. Simulation results in some realistic scenarios showed that the technique allows to relate connectivity with transmission power levels and to identify critical transmission power levels. Also, it is shown that the technique is equivalent to an approximated mean value in terms of connectivity aspects.","PeriodicalId":415618,"journal":{"name":"International Latin American Networking Conference","volume":"77 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125998650","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
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