Pub Date : 2007-06-06DOI: 10.1109/ITST.2007.4295839
S. Yousefi, Eitan Altman, R. El-Azouzi, M. Fathy
Connectivity in vehicular ad hoc networks tends to be vulnerable. This is mostly because of the influence of road's traffic parameters like traffic flow and vehicle's speed. One possible way to improve the connectivity is to add some nodes with higher transmission range. These nodes also could give some commercial services to the vehicles on roads (i.e. audio/video service, traffic information, etc.). In this paper we study the connectivity in presence of these nodes which we call mobile base-stations. Our approach is based on the work of Miorandi and Altman that transformed the problem of connectivity distance distribution into that of the distribution of the busy period of an equivalent infinite server queue. We study the effects of mobile base-stations on the connectivity distance and number of nodes in a spatial cluster (platoon). In our investigation we use some publicly available statistical data and realistic traffic patterns. Our model can be used to obtain optimum values for number of base-stations and their transmission range in order to achieve intended degree of connectivity.
{"title":"Connectivity in vehicular ad hoc networks in presence wireless mobile base-stations","authors":"S. Yousefi, Eitan Altman, R. El-Azouzi, M. Fathy","doi":"10.1109/ITST.2007.4295839","DOIUrl":"https://doi.org/10.1109/ITST.2007.4295839","url":null,"abstract":"Connectivity in vehicular ad hoc networks tends to be vulnerable. This is mostly because of the influence of road's traffic parameters like traffic flow and vehicle's speed. One possible way to improve the connectivity is to add some nodes with higher transmission range. These nodes also could give some commercial services to the vehicles on roads (i.e. audio/video service, traffic information, etc.). In this paper we study the connectivity in presence of these nodes which we call mobile base-stations. Our approach is based on the work of Miorandi and Altman that transformed the problem of connectivity distance distribution into that of the distribution of the busy period of an equivalent infinite server queue. We study the effects of mobile base-stations on the connectivity distance and number of nodes in a spatial cluster (platoon). In our investigation we use some publicly available statistical data and realistic traffic patterns. Our model can be used to obtain optimum values for number of base-stations and their transmission range in order to achieve intended degree of connectivity.","PeriodicalId":106396,"journal":{"name":"2007 7th International Conference on ITS Telecommunications","volume":"106 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132024774","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}
Pub Date : 2007-06-06DOI: 10.1109/ITST.2007.4295860
P. Gkonis, T. Athanaileas, G. Tsoulos, D. Kaklamani
The purpose of the study presented in this paper is to investigate the performance of a multicelluar Wideband Code Division Multiple Access (WCDMA) network for different multiuser detection (MUD) strategies in terms of maximum achievable capacity. Capacity is evaluated both with system level simulations for different loading, as well as with link level simulations for different MUD techniques. Due to the increased complexity of the problem, a grid-enabled problem solving environment is developed in order to reduce execution time and make feasible the Monte Carlo (MC) simulation of scenarios with up to 4 tiers of cells and increased number of users. Hence, this Grid enabled WCDMA simulator now allows for detailed consideration of the multi-cell multi-user interference with complex techniques like MUD, previously not possible. Results indicate that the parallel interference cancellation (PIC) technique with one stage detection has the best performance in a multicellular network with ideal power control.
{"title":"Performance of WCDMA in a Multicellular Network for different Multiuser Detection Strategies","authors":"P. Gkonis, T. Athanaileas, G. Tsoulos, D. Kaklamani","doi":"10.1109/ITST.2007.4295860","DOIUrl":"https://doi.org/10.1109/ITST.2007.4295860","url":null,"abstract":"The purpose of the study presented in this paper is to investigate the performance of a multicelluar Wideband Code Division Multiple Access (WCDMA) network for different multiuser detection (MUD) strategies in terms of maximum achievable capacity. Capacity is evaluated both with system level simulations for different loading, as well as with link level simulations for different MUD techniques. Due to the increased complexity of the problem, a grid-enabled problem solving environment is developed in order to reduce execution time and make feasible the Monte Carlo (MC) simulation of scenarios with up to 4 tiers of cells and increased number of users. Hence, this Grid enabled WCDMA simulator now allows for detailed consideration of the multi-cell multi-user interference with complex techniques like MUD, previously not possible. Results indicate that the parallel interference cancellation (PIC) technique with one stage detection has the best performance in a multicellular network with ideal power control.","PeriodicalId":106396,"journal":{"name":"2007 7th International Conference on ITS Telecommunications","volume":"4 6","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132090696","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}
Pub Date : 2007-06-06DOI: 10.1109/ITST.2007.4295826
H. Chu, Yun Cai, Xiaoguang Yang
Bus Arrival Time Prediction (BATP) is one component of ITS and travel time information is also a major aspect of Bus Information Service System In order to predict travel time, in an accurate and timely manner, the consideration of traffic state is essential, including traffic congestion, bus dwell time at stops, intersection signal time, weather and incidents information etc. In this paper, previous research has been looked up to and a BATP model has been developed to predict the bus arrival time with data from 910-line buses in Shanghai. A BAT code has been created to consider multi-source traffic information for predicting bus arrival time. At last the prediction results have been proved good enough to applying. So the BATP model in this paper will has practical meanings for project.
{"title":"Research on Bus Arrival Time Prediction Based on Multi-Source Traffic Information","authors":"H. Chu, Yun Cai, Xiaoguang Yang","doi":"10.1109/ITST.2007.4295826","DOIUrl":"https://doi.org/10.1109/ITST.2007.4295826","url":null,"abstract":"Bus Arrival Time Prediction (BATP) is one component of ITS and travel time information is also a major aspect of Bus Information Service System In order to predict travel time, in an accurate and timely manner, the consideration of traffic state is essential, including traffic congestion, bus dwell time at stops, intersection signal time, weather and incidents information etc. In this paper, previous research has been looked up to and a BATP model has been developed to predict the bus arrival time with data from 910-line buses in Shanghai. A BAT code has been created to consider multi-source traffic information for predicting bus arrival time. At last the prediction results have been proved good enough to applying. So the BATP model in this paper will has practical meanings for project.","PeriodicalId":106396,"journal":{"name":"2007 7th International Conference on ITS Telecommunications","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128433769","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}
Pub Date : 2007-06-06DOI: 10.1109/ITST.2007.4295864
E. Baccelli, Thomas H. Clausen, Philippe Jacquet, Dang-Quan Nguyen
Solutions for mobile ad hoc routing have matured. Building atop these foundations, new challenges are set for MANETs, such as integration in the Internet core. On this topic, this paper designs and evaluates MPR-OSPF, an extension of the OSPF protocol enabling its operation on networks that may include both MANET nodes and usual fixed routers. Automatic integration of different types of vehicular ad hoc networks (VANETs) in the IP infrastructure is then possible using the classic OSPF framework. Techniques used therefore are derived from OLSR, the MANET routing protocol that is the most compatible with traditional IP environments.
{"title":"Integrating VANETs in the Internet Core with OSPF : the MPR-OSPF Approach","authors":"E. Baccelli, Thomas H. Clausen, Philippe Jacquet, Dang-Quan Nguyen","doi":"10.1109/ITST.2007.4295864","DOIUrl":"https://doi.org/10.1109/ITST.2007.4295864","url":null,"abstract":"Solutions for mobile ad hoc routing have matured. Building atop these foundations, new challenges are set for MANETs, such as integration in the Internet core. On this topic, this paper designs and evaluates MPR-OSPF, an extension of the OSPF protocol enabling its operation on networks that may include both MANET nodes and usual fixed routers. Automatic integration of different types of vehicular ad hoc networks (VANETs) in the IP infrastructure is then possible using the classic OSPF framework. Techniques used therefore are derived from OLSR, the MANET routing protocol that is the most compatible with traditional IP environments.","PeriodicalId":106396,"journal":{"name":"2007 7th International Conference on ITS Telecommunications","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126205652","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}
Pub Date : 2007-06-06DOI: 10.1109/ITST.2007.4295871
Fan Yu, S. Biswas
This paper presents a performance comparison between the DSRC-recommended 802.11 medium access control (MAC) and a novel vehicular self-organizing MAC (VeSOMAC) protocol in the context intelligent transportation system applications. VeSOMAC is a distributed TDMA MAC protocol that relies on in-band control exchange for autonomous and self-configurable TDMA slot allocation. Detailed network and vehicular traffic models have been developed in this paper for a cooperative collision avoidance (CCA) application in highway and urban traffic intersection scenarios. Simulation results demonstrate that unlike the 802.11 style contention based protocols, VeSOMAC can offer better vehicle safety in both highway and urban intersection scenarios through smaller and bounded inter-vehicle packet latency.
{"title":"Impacts of Radio Access Protocols on the Performance of DSRC based ITS Applications","authors":"Fan Yu, S. Biswas","doi":"10.1109/ITST.2007.4295871","DOIUrl":"https://doi.org/10.1109/ITST.2007.4295871","url":null,"abstract":"This paper presents a performance comparison between the DSRC-recommended 802.11 medium access control (MAC) and a novel vehicular self-organizing MAC (VeSOMAC) protocol in the context intelligent transportation system applications. VeSOMAC is a distributed TDMA MAC protocol that relies on in-band control exchange for autonomous and self-configurable TDMA slot allocation. Detailed network and vehicular traffic models have been developed in this paper for a cooperative collision avoidance (CCA) application in highway and urban traffic intersection scenarios. Simulation results demonstrate that unlike the 802.11 style contention based protocols, VeSOMAC can offer better vehicle safety in both highway and urban intersection scenarios through smaller and bounded inter-vehicle packet latency.","PeriodicalId":106396,"journal":{"name":"2007 7th International Conference on ITS Telecommunications","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127427003","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}
Pub Date : 2007-06-06DOI: 10.1109/ITST.2007.4295856
V. Hinostroza
This work is about the effect of frequency selectivity on multi-carrier wideband signals in two different environments; indoors and outdoor to indoor. The investigation was made using measurements carried out with a sounder with a 300 MHz bandwidth. The main part of this work is to evaluate the contribution of several related parameters; frequency selective fading, coherence bandwidth and delay spread on the frequency selectivity of the channel. A description of the sounder parameters and the sounded environments are given. The 300 MHz bandwidth is divided in segments as small as 60 kHz to perform the evaluation of frequency selective fading. Sub channels of 20 MHz for OFDM systems and 5 MHz for WCDMA were evaluated. Graphics are provided for a number of bands, parameters and locations in the different environments. It is also shown the variation of the signal level due to frequency selective fading. The practical assumptions about the coherence bandwidth and delay spread are reviewed and a comparison is made with actual measurements. Statistical analysis was performed over some of the results.
{"title":"Frequency Selectivity Parameters for Broadband Signals","authors":"V. Hinostroza","doi":"10.1109/ITST.2007.4295856","DOIUrl":"https://doi.org/10.1109/ITST.2007.4295856","url":null,"abstract":"This work is about the effect of frequency selectivity on multi-carrier wideband signals in two different environments; indoors and outdoor to indoor. The investigation was made using measurements carried out with a sounder with a 300 MHz bandwidth. The main part of this work is to evaluate the contribution of several related parameters; frequency selective fading, coherence bandwidth and delay spread on the frequency selectivity of the channel. A description of the sounder parameters and the sounded environments are given. The 300 MHz bandwidth is divided in segments as small as 60 kHz to perform the evaluation of frequency selective fading. Sub channels of 20 MHz for OFDM systems and 5 MHz for WCDMA were evaluated. Graphics are provided for a number of bands, parameters and locations in the different environments. It is also shown the variation of the signal level due to frequency selective fading. The practical assumptions about the coherence bandwidth and delay spread are reviewed and a comparison is made with actual measurements. Statistical analysis was performed over some of the results.","PeriodicalId":106396,"journal":{"name":"2007 7th International Conference on ITS Telecommunications","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126599138","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}
Pub Date : 2007-06-06DOI: 10.1109/ITST.2007.4295917
G. Yao, Tianhao Tang
For the purpose of marine safety, this paper, after discussing the advantages of MAS compared with traditional DCS structure, presents a hybrid intelligent multi-agent method for engineer room monitoring and faults diagnosis. A new diagnosis process, combined with data mining and neural networks, are discussed as well as the functions and structure of agent which implements these algorithms. At last, some simulation results are shown to demonstrate the efficiency of the proposed system.
{"title":"A Multi-Agent Based Intelligent Engineer Room Monitoring and Diagnosis Method for Marine Safety","authors":"G. Yao, Tianhao Tang","doi":"10.1109/ITST.2007.4295917","DOIUrl":"https://doi.org/10.1109/ITST.2007.4295917","url":null,"abstract":"For the purpose of marine safety, this paper, after discussing the advantages of MAS compared with traditional DCS structure, presents a hybrid intelligent multi-agent method for engineer room monitoring and faults diagnosis. A new diagnosis process, combined with data mining and neural networks, are discussed as well as the functions and structure of agent which implements these algorithms. At last, some simulation results are shown to demonstrate the efficiency of the proposed system.","PeriodicalId":106396,"journal":{"name":"2007 7th International Conference on ITS Telecommunications","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129862639","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}
Pub Date : 2007-06-01DOI: 10.1109/ITST.2007.4295890
Panos Papadimitratos, L. Buttyán, J. Hubaux, F. Kargl, A. Kung, M. Raya
The deployment of vehicular communication (VC) systems is strongly dependent on their security and privacy features. In this paper, we propose a security architecture for VC. The primary objectives of the architecture include the management of identities and cryptographic keys, the security of communications, and the integration of privacy enhancing technologies. Our design approach aims at a system that relies on well-understood components which can be upgraded to provide enhanced security and privacy protection in the future. This effort is undertaken by SeVeCom (http://www.sevecom.org), a transversal project providing security and privacy enhancing mechanisms compatible with the VC technologies currently under development by all EU funded projects.
{"title":"Architecture for Secure and Private Vehicular Communications","authors":"Panos Papadimitratos, L. Buttyán, J. Hubaux, F. Kargl, A. Kung, M. Raya","doi":"10.1109/ITST.2007.4295890","DOIUrl":"https://doi.org/10.1109/ITST.2007.4295890","url":null,"abstract":"The deployment of vehicular communication (VC) systems is strongly dependent on their security and privacy features. In this paper, we propose a security architecture for VC. The primary objectives of the architecture include the management of identities and cryptographic keys, the security of communications, and the integration of privacy enhancing technologies. Our design approach aims at a system that relies on well-understood components which can be upgraded to provide enhanced security and privacy protection in the future. This effort is undertaken by SeVeCom (http://www.sevecom.org), a transversal project providing security and privacy enhancing mechanisms compatible with the VC technologies currently under development by all EU funded projects.","PeriodicalId":106396,"journal":{"name":"2007 7th International Conference on ITS Telecommunications","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127999265","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}
Pub Date : 1900-01-01DOI: 10.1109/itst.2007.4295844
{"title":"Sensing Technologies","authors":"","doi":"10.1109/itst.2007.4295844","DOIUrl":"https://doi.org/10.1109/itst.2007.4295844","url":null,"abstract":"","PeriodicalId":106396,"journal":{"name":"2007 7th International Conference on ITS Telecommunications","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116818747","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}
Pub Date : 1900-01-01DOI: 10.1109/itst.2007.4295827
{"title":"Vehicle to Vehicle/Infrastructure Communications - 1","authors":"","doi":"10.1109/itst.2007.4295827","DOIUrl":"https://doi.org/10.1109/itst.2007.4295827","url":null,"abstract":"","PeriodicalId":106396,"journal":{"name":"2007 7th International Conference on ITS Telecommunications","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128653178","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}
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