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2007 2nd International Symposium on Wireless Pervasive Computing最新文献

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Active Cache Based Defense against DoS Attacks in Wireless Mesh Network 基于主动缓存的无线网状网络DoS攻击防御
2007 2nd International Symposium on Wireless Pervasive Computing Pub Date : 2007-04-16 DOI: 10.1109/ISWPC.2007.342640
L. Santhanam, D. Nandiraju, N. Nandiraju, D. Agrawal
{"title":"Active Cache Based Defense against DoS Attacks in Wireless Mesh Network","authors":"L. Santhanam, D. Nandiraju, N. Nandiraju, D. Agrawal","doi":"10.1109/ISWPC.2007.342640","DOIUrl":"https://doi.org/10.1109/ISWPC.2007.342640","url":null,"abstract":"Wireless mesh network (WMN) is evolving to be a new paradigm for wireless Internet connectivity as it obviates the need for wired infrastructure at every access point (AP) a.k.a mesh router (MR). The MRs collaboratively forward the traffic towards the Internet gateway (IGW). The self-configurable architecture of MRs paves way for malicious intruders to conduct a denial-of-service attack (DoS) on the MRs by flooding the network with a large volume of traffic; thus rendering the system inaccessible to the real users. In this paper, we present a cache based defense at the MRs to identify flooding style DoS attacks. We use a most frequently used cache mechanism to identify such flows and raise an early alert to curb them. We effectively avert any performance degradation by dropping the identified attack flows along the forwarding routers. Simulation results indicate that our scheme offers an active line of defense against DoS attacks","PeriodicalId":403213,"journal":{"name":"2007 2nd International Symposium on Wireless Pervasive Computing","volume":"64 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126041203","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: 27
Quality Assessment of an Adaptive Filter for Artifact Reduction in Mobile Video Sequences 一种用于移动视频序列伪影减少的自适应滤波器质量评估
2007 2nd International Symposium on Wireless Pervasive Computing Pub Date : 2007-04-16 DOI: 10.1109/ISWPC.2007.342630
U. Engelke, A. Rossholm, H. Zepernick, B. Lovstrom
{"title":"Quality Assessment of an Adaptive Filter for Artifact Reduction in Mobile Video Sequences","authors":"U. Engelke, A. Rossholm, H. Zepernick, B. Lovstrom","doi":"10.1109/ISWPC.2007.342630","DOIUrl":"https://doi.org/10.1109/ISWPC.2007.342630","url":null,"abstract":"In this paper, we examine an adaptive deblocking deringing filter for mobile video sequences in H.263 format. The considered filter has been designed with reference to the constraints of computational complexity and working memory of mobile terminals. The post filter suggested by the International Telecommunications Union (ITU) in Recommendation H.263 App. III is also included as a reference. Given that fidelity metrics such as the peak signal-to-noise ratio (PSNR) do not necessarily correlate well with video quality as experienced by the user, we consider in this paper objective quality metrics that can incorporate knowledge about the user's perception into the quality assessment. Guidelines for choosing filter parameters in relation to user-perceived video quality are obtained from the numerical results","PeriodicalId":403213,"journal":{"name":"2007 2nd International Symposium on Wireless Pervasive Computing","volume":"104 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126056897","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
A WLAN/WMAN Dual Mode Transceiver System for Indoor/Outdoor Application 用于室内/室外应用的WLAN/WMAN双模收发器系统
2007 2nd International Symposium on Wireless Pervasive Computing Pub Date : 2007-04-16 DOI: 10.1109/ISWPC.2007.342592
K. Chun, Joonyeop Lee, Ji-hyuk Kim, H. Kim, Kwang-Jun Yoon, Young-il Kim, I. Song
{"title":"A WLAN/WMAN Dual Mode Transceiver System for Indoor/Outdoor Application","authors":"K. Chun, Joonyeop Lee, Ji-hyuk Kim, H. Kim, Kwang-Jun Yoon, Young-il Kim, I. Song","doi":"10.1109/ISWPC.2007.342592","DOIUrl":"https://doi.org/10.1109/ISWPC.2007.342592","url":null,"abstract":"WLAN (IEEE 802.11a)/VMAN (IEEE 802.16a) dual mode transceiver chip has been proposed, designed and fabricated. Transceiver RF IC chip with packaged size of 6 mm*6 mm was fabricated using 0.25 um SiGe BiCMOS process. Power amplifier and PLL/VCO chip were fabricated using the same process. Ceramic front-end filter were also fabricated for WLAN/WMAN frequencies. To make compact transceiver system, these chips was mounted on 2 cm*2 cm double side PCB. The full system has been tested with external ADC/DAC and baseband modem. The measured results show that fabricated transceiver system meets the requirements for WLAN/WMAN standards","PeriodicalId":403213,"journal":{"name":"2007 2nd International Symposium on Wireless Pervasive Computing","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121724368","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: 2
Multiple-Objective Metric for Placing Multiple Base Stations in Wireless Sensor Networks 无线传感器网络中多基站放置的多目标度量
2007 2nd International Symposium on Wireless Pervasive Computing Pub Date : 2007-04-16 DOI: 10.1109/ISWPC.2007.342679
Soo Kim, Jeong-Gil Ko, Jongwon Yoon, Heejo Lee
{"title":"Multiple-Objective Metric for Placing Multiple Base Stations in Wireless Sensor Networks","authors":"Soo Kim, Jeong-Gil Ko, Jongwon Yoon, Heejo Lee","doi":"10.1109/ISWPC.2007.342679","DOIUrl":"https://doi.org/10.1109/ISWPC.2007.342679","url":null,"abstract":"The placement of base stations in wireless sensor networks affects the coverage of sensor nodes, the tolerance against faults or attacks, the energy consumption and the congestion from communication. However, previous studies mostly focus on the placement of base stations to improve a partial property, not considering all of them. In this paper we propose multiple-objective metric (MOM), which reflects four different metrics for base station placement in wireless sensor networks. First, the ratio of sensor nodes which can communicate with a base station via either single-hop or multi-hop represents the coverage of sensor nodes. Second, the average ratio of sensor nodes after the failure of base stations represents the fault tolerance of a network. Third, the average distance between sensor nodes and their nearest base station represents the energy consumption of a network. Fourth, the standard deviation of the degree of base stations represents the average delay of a network due to congestion. We show that placing multiple base stations using our proposed MOM can fairly increase various properties of wireless sensor networks","PeriodicalId":403213,"journal":{"name":"2007 2nd International Symposium on Wireless Pervasive Computing","volume":"102 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121480979","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: 38
Virtual Mobile Backbones for Wireless Ad-hoc Networks with the support of Directional Array Antennas 定向阵列天线支持下无线自组织网络的虚拟移动主干网
2007 2nd International Symposium on Wireless Pervasive Computing Pub Date : 2007-04-16 DOI: 10.1109/ISWPC.2007.342621
Jeonggil Ko, Ji-Hun Ha, B. Park, Seung-goo Lee, Hak-Lim Ko
{"title":"Virtual Mobile Backbones for Wireless Ad-hoc Networks with the support of Directional Array Antennas","authors":"Jeonggil Ko, Ji-Hun Ha, B. Park, Seung-goo Lee, Hak-Lim Ko","doi":"10.1109/ISWPC.2007.342621","DOIUrl":"https://doi.org/10.1109/ISWPC.2007.342621","url":null,"abstract":"Ad-hoc network techniques are in the center of attention to many scientists and engineers in the fact that wireless ad-hoc networks will bring high speed communication to the users with no given fixed infrastructure such as the base station or the AP (access point). However, the infrastructure-less topology brings new limitations such as small connectivity of nodes in the network caused by the short communication range of nodes. In this work, to solve these problems we propose the adaptation of directional array antennas in a virtual mobile backbone ad-hoc network. This adaptation can partially solve the complexity problem by activating directional array antennas only at backbone nodes and by performing beamforming techniques it will bring better connectivity of the nodes in the network resulting higher throughput performance","PeriodicalId":403213,"journal":{"name":"2007 2nd International Symposium on Wireless Pervasive Computing","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127720864","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
Optimization of IEEE 802.11e Access Class Parameters with Cross-layer Approach 跨层方法优化IEEE 802.11e接入类参数
2007 2nd International Symposium on Wireless Pervasive Computing Pub Date : 2007-04-16 DOI: 10.1109/ISWPC.2007.342589
Ivano Alocci, Giovanni Giambene, Y. Koucheryavy
{"title":"Optimization of IEEE 802.11e Access Class Parameters with Cross-layer Approach","authors":"Ivano Alocci, Giovanni Giambene, Y. Koucheryavy","doi":"10.1109/ISWPC.2007.342589","DOIUrl":"https://doi.org/10.1109/ISWPC.2007.342589","url":null,"abstract":"The aim of this paper is to analyze the performance of diverse applications in a wireless scenario based on the IEEE 802.11e standard. In particular, TCP-based traffic (several TCP versions was be used, such as: TCP NewReno, SACK, and Westwood+) and UDP-based traffic was considered referring to FTP download and VoIP applications, respectively. Tests carried out in the ns-2 environment have permitted to evaluate quality of service issues and the cross-layer impact on the transport layer due to EDCA parameters. The interest is here on the selection of the contention window sizes for different IEEE 802.11e access classes in order to guarantee a good performance for both TCP-based and UDP-based traffic flows.","PeriodicalId":403213,"journal":{"name":"2007 2nd International Symposium on Wireless Pervasive Computing","volume":"59 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122182287","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: 5
A Framework for supporting VoIP Services over the Downlink of an OFDMA Network 在OFDMA网络下行链路上支持VoIP业务的框架
2007 2nd International Symposium on Wireless Pervasive Computing Pub Date : 2007-04-16 DOI: 10.1109/ISWPC.2007.342646
Patrick Hosein
{"title":"A Framework for supporting VoIP Services over the Downlink of an OFDMA Network","authors":"Patrick Hosein","doi":"10.1109/ISWPC.2007.342646","DOIUrl":"https://doi.org/10.1109/ISWPC.2007.342646","url":null,"abstract":"The fourth generation of wireless networks (4G) are presently being discussed in standards bodies (3GPP2, 3GPP, 802.16, 802.20) and one common conclusion is that the most appropriate technology for the forward link is orthogonal frequency division multiple access (OFDMA). In addition, it is believed that all services (i.e., both real-time services like voice and also data) can be supported over such a channel using an all-IP network. However, even for 3G networks, the efficient support of services such as voice over IP (VoIP) over wireless packet switched channels is still to be verified in the field. In this paper, we look at the issues involved in transporting VoIP over the forward link of an OFDMA network and propose a framework that can address many of these issues. We support our proposals with numerical results","PeriodicalId":403213,"journal":{"name":"2007 2nd International Symposium on Wireless Pervasive Computing","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131947952","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
A New Protocol to Mitigate the Unheard RTS/CTS Problem in Networks with Switched Beam Antennas 一种缓解交换波束天线网络中未听RTS/CTS问题的新协议
2007 2nd International Symposium on Wireless Pervasive Computing Pub Date : 2007-04-16 DOI: 10.1109/ISWPC.2007.342587
Valli A. RamMohan, H. Sethu, Madhusudan Hosaagrahara, K. Dandekar
{"title":"A New Protocol to Mitigate the Unheard RTS/CTS Problem in Networks with Switched Beam Antennas","authors":"Valli A. RamMohan, H. Sethu, Madhusudan Hosaagrahara, K. Dandekar","doi":"10.1109/ISWPC.2007.342587","DOIUrl":"https://doi.org/10.1109/ISWPC.2007.342587","url":null,"abstract":"Wireless networks with the capability for directional transmissions using switched beam antennas have increasingly been used to increase the coverage area of nodes as well as to improve spatial reuse. This paper is concerned with the unheard RTS/CTS problem that arises due to the use of directional transmissions. The problem occurs because a node, while beam-formed in one direction, cannot hear the RTS/CTS messages that arrive on another direction with information pertaining to channel reservation. A node, therefore, transmits when it should defer, leading to unnecessary collisions and degraded performance. In this paper, we propose a new MAC protocol that uses a combination of three features to combat the problem: fragmentation of packets, the use of a tone signal to alert potential collision-causing nodes during ongoing transmission, and the use of a pause period when transmission is likely to lead to a collision. As opposed to other work on this problem, our protocol does not assume separate data and control channels. We present simulation results showing that our protocol can reduce the number of retransmissions of data packets due to the unheard RTS/CTS problem by as much as 86%, thus improving the delay and throughput characteristics of the network.","PeriodicalId":403213,"journal":{"name":"2007 2nd International Symposium on Wireless Pervasive Computing","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132830833","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: 6
Performance Study of a Secure Routing Protocol in Wireless Mobile Ad Hoc Networks 无线移动自组网中安全路由协议的性能研究
2007 2nd International Symposium on Wireless Pervasive Computing Pub Date : 2007-04-16 DOI: 10.1109/ISWPC.2007.342641
M. Alsaadi, Y. Qian
{"title":"Performance Study of a Secure Routing Protocol in Wireless Mobile Ad Hoc Networks","authors":"M. Alsaadi, Y. Qian","doi":"10.1109/ISWPC.2007.342641","DOIUrl":"https://doi.org/10.1109/ISWPC.2007.342641","url":null,"abstract":"Mobile ad hoc network (MANET) is a special type of mobile wireless network where a collection of mobile devices form a temporary network without any aid of an established infrastructure. Security issues put special challenges in MANET routing protocol design. This paper focuses on the performance study for security of a MANET routing protocol, and particularly on the improvement of the security for dynamic source routing protocol (DSR). We improve the security of routing for the existing DSR protocol by enhancing the concept of trust value, the selection of a secure route will be based on these trust values, ns-2 simulations are performed to evaluate the impact of applying trust value based route selection to the DSR protocol","PeriodicalId":403213,"journal":{"name":"2007 2nd International Symposium on Wireless Pervasive Computing","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115521424","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: 13
EUTRAN Uplink Performance EUTRAN上行链路性能
2007 2nd International Symposium on Wireless Pervasive Computing Pub Date : 2007-04-16 DOI: 10.1109/ISWPC.2007.342658
T. Lunttila, J. Lindholm, K. Pajukoski, E. Tiirola, A. Toskala
{"title":"EUTRAN Uplink Performance","authors":"T. Lunttila, J. Lindholm, K. Pajukoski, E. Tiirola, A. Toskala","doi":"10.1109/ISWPC.2007.342658","DOIUrl":"https://doi.org/10.1109/ISWPC.2007.342658","url":null,"abstract":"Alongside with on-going further WCDMA development, work on evolved universal terrestrial radio access network (EUTRAN), also known as long term evolution (LTE), has been initiated in 3GPP. The objective of EUTRAN is to develop a framework for the evolution of the 3GPP radio-access technology towards wider bandwidth, lower latency and packet-optimized radio-access technology with peak data rate capability up to 100 Mbps. For the uplink direction, single carrier-FDMA (SC-FDMA) has been chosen as the multiple access technology. This paper introduces the uplink technology, the current state of progress in 3GPP as well as expected schedule for actual specification availability and describes a couple of key features, channel dependent frequency domain scheduling and multi-user MIMO in more detail. System performance results for channel dependent frequency domain scheduling are presented as well","PeriodicalId":403213,"journal":{"name":"2007 2nd International Symposium on Wireless Pervasive Computing","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125037259","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: 64
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