Pub Date : 2008-10-24DOI: 10.1109/IWSSC.2008.4656822
F. Nadeem, E. Leitgeb, M. S. Awan, M.S. Khan, G. Kandus
Free Space Optics (FSO) links provide usage of high bandwidth and the flexibility of wireless communication links. However, weather patterns like fog and heavy snow fall limit the availability of FSO. Another technology providing similar properties regarding offered data rates and flexibility of set up is Millimeter Wave Technology (mmW), operating at several tens of GHz. In this case, heavy rain limits mmW link availability. A combination of both technologies has been proved to be very effective to achieve very high availability. This requires redundant transmission on both links, which results in loss of transmission bandwidth. In this paper, a bandwidth efficient switch-over between these technologies is discussed. This switch-over can maintain high availability without the loss of available bandwidth for unnecessary redundant transmission. The performance of this switch-over has been simulated for more than one year measured availability data for hybrid network of mmW link and FSO link. It has been shown that the availability with switch-over reaches the redundant link availability but it can increase the hybrid network throughput significantly.
{"title":"Throughput efficient solution for hybrid wireless network","authors":"F. Nadeem, E. Leitgeb, M. S. Awan, M.S. Khan, G. Kandus","doi":"10.1109/IWSSC.2008.4656822","DOIUrl":"https://doi.org/10.1109/IWSSC.2008.4656822","url":null,"abstract":"Free Space Optics (FSO) links provide usage of high bandwidth and the flexibility of wireless communication links. However, weather patterns like fog and heavy snow fall limit the availability of FSO. Another technology providing similar properties regarding offered data rates and flexibility of set up is Millimeter Wave Technology (mmW), operating at several tens of GHz. In this case, heavy rain limits mmW link availability. A combination of both technologies has been proved to be very effective to achieve very high availability. This requires redundant transmission on both links, which results in loss of transmission bandwidth. In this paper, a bandwidth efficient switch-over between these technologies is discussed. This switch-over can maintain high availability without the loss of available bandwidth for unnecessary redundant transmission. The performance of this switch-over has been simulated for more than one year measured availability data for hybrid network of mmW link and FSO link. It has been shown that the availability with switch-over reaches the redundant link availability but it can increase the hybrid network throughput significantly.","PeriodicalId":137382,"journal":{"name":"2008 IEEE International Workshop on Satellite and Space Communications","volume":"51 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132717501","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 : 2008-10-24DOI: 10.1109/IWSSC.2008.4656758
L. Csurgai-Horváth, J. Bitó
This paper investigates the Markov property of the fading process measured on land mobile satellite (LMS) channel and determines the appropriate order of discrete state and discrete time Markov chain, which is capable to reproduce the original fading process. The investigated radio link is an L- band terrestrial-satellite channel, measured on board of a moving vehicle in different environments (urban and highway), therefore the channel is effected by multipath/shadowing propagation impairments. As a first approach of the problem, the analog received power process will be transformed into a digital fading process in order to handle it as a two-state (fade/non-fade according to the given threshold) process. To correctly reproduce the high order statistics of the fading process an appropriate discrete time and discrete state homogenous Markov chain has to be selected. The order of the model influences its capability to reproduce the channel memory. With properly selected threshold, by transforming the analog fading process into a fading/non-fading digital process a Chi-square test can be applied to determine the order of the process. Our investigations are showing that the order of the two-state fade/non-fade process slightly depends on the threshold of separation the fade and interfade events. The results can be applied also to test the order in case of more than two states, when the quantization of the attenuation amplitude performed for multiple levels.
{"title":"Testing the Markov property of the multipath fading process","authors":"L. Csurgai-Horváth, J. Bitó","doi":"10.1109/IWSSC.2008.4656758","DOIUrl":"https://doi.org/10.1109/IWSSC.2008.4656758","url":null,"abstract":"This paper investigates the Markov property of the fading process measured on land mobile satellite (LMS) channel and determines the appropriate order of discrete state and discrete time Markov chain, which is capable to reproduce the original fading process. The investigated radio link is an L- band terrestrial-satellite channel, measured on board of a moving vehicle in different environments (urban and highway), therefore the channel is effected by multipath/shadowing propagation impairments. As a first approach of the problem, the analog received power process will be transformed into a digital fading process in order to handle it as a two-state (fade/non-fade according to the given threshold) process. To correctly reproduce the high order statistics of the fading process an appropriate discrete time and discrete state homogenous Markov chain has to be selected. The order of the model influences its capability to reproduce the channel memory. With properly selected threshold, by transforming the analog fading process into a fading/non-fading digital process a Chi-square test can be applied to determine the order of the process. Our investigations are showing that the order of the two-state fade/non-fade process slightly depends on the threshold of separation the fade and interfade events. The results can be applied also to test the order in case of more than two states, when the quantization of the attenuation amplitude performed for multiple levels.","PeriodicalId":137382,"journal":{"name":"2008 IEEE International Workshop on Satellite and Space Communications","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132720214","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 : 2008-10-24DOI: 10.1109/IWSSC.2008.4656797
A. Gotta, P. Barsocchi
This paper aims at studying the behaviour of satellite DVB systems in a vehicular mobile environment by deriving a channel model at packet level that accounts for the mobile characteristic of the channel and the performance of the DVB architecture at physical layer. Moreover the paper provides some solutions based on error recovery techniques, i.e. packet level FEC and interleaving, in order to boost the Quality of Service of streaming applications by providing quantitative and qualitative metrics of the reliability of such transmissions over a land mobile satellite channel.
{"title":"Experimental video broadcasting in DVB-RCS/S2 with land mobile satellite channel: A reliability issue","authors":"A. Gotta, P. Barsocchi","doi":"10.1109/IWSSC.2008.4656797","DOIUrl":"https://doi.org/10.1109/IWSSC.2008.4656797","url":null,"abstract":"This paper aims at studying the behaviour of satellite DVB systems in a vehicular mobile environment by deriving a channel model at packet level that accounts for the mobile characteristic of the channel and the performance of the DVB architecture at physical layer. Moreover the paper provides some solutions based on error recovery techniques, i.e. packet level FEC and interleaving, in order to boost the Quality of Service of streaming applications by providing quantitative and qualitative metrics of the reliability of such transmissions over a land mobile satellite channel.","PeriodicalId":137382,"journal":{"name":"2008 IEEE International Workshop on Satellite and Space Communications","volume":"298 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132827803","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 : 2008-10-24DOI: 10.1109/IWSSC.2008.4656733
J. Barceló, G. Giambene, M. Castro
This paper presents a methodology to optimize the use of the forward link DVB-S2 capacity. Our interest is optimizing the switching Eb/N0 thresholds for adaptive coding and modulation selection in DVB-S2 in order to maximize the TCP goodput according to a cross-layer design approach.
{"title":"Cross-layer optimization of TCP throughput for DVB-S2 links","authors":"J. Barceló, G. Giambene, M. Castro","doi":"10.1109/IWSSC.2008.4656733","DOIUrl":"https://doi.org/10.1109/IWSSC.2008.4656733","url":null,"abstract":"This paper presents a methodology to optimize the use of the forward link DVB-S2 capacity. Our interest is optimizing the switching Eb/N0 thresholds for adaptive coding and modulation selection in DVB-S2 in order to maximize the TCP goodput according to a cross-layer design approach.","PeriodicalId":137382,"journal":{"name":"2008 IEEE International Workshop on Satellite and Space Communications","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125243571","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 : 2008-10-24DOI: 10.1109/IWSSC.2008.4656823
S. Sahin, K. Narayanaswamy, E. Campos-Náñez
Todaypsilas mobile satellite systems are built to support a packet switched all IP communications infrastructure based on IP multimedia subsystem (IMS) leveraging the benefits of solutions already available in terrestrial networks. IMS technology provides a SIP based open platform that enables operators to introduce multimedia applications quickly and in a cost effective manner. Although IMS is very well suited for terrestrial IP networks, it is challenged by high propagation delay satellite environment with low data rates to provide equivalent levels of quality of experience enjoyed by subscribers of circuit switched systems. In this article, we first provide an overview of Circuit Switched and IMS Packet Switched based call flows for mobile satellite systems. We then concentrate specifically on voice call setup time and show how Circuit Switched architecture provides significantly better performance. Lastly, we propose several advancements on SIP call signaling to improve the IMS Packet Switched call setup times.
{"title":"Call setup performance improvements over mobile satellite systems using IP multimedia system","authors":"S. Sahin, K. Narayanaswamy, E. Campos-Náñez","doi":"10.1109/IWSSC.2008.4656823","DOIUrl":"https://doi.org/10.1109/IWSSC.2008.4656823","url":null,"abstract":"Todaypsilas mobile satellite systems are built to support a packet switched all IP communications infrastructure based on IP multimedia subsystem (IMS) leveraging the benefits of solutions already available in terrestrial networks. IMS technology provides a SIP based open platform that enables operators to introduce multimedia applications quickly and in a cost effective manner. Although IMS is very well suited for terrestrial IP networks, it is challenged by high propagation delay satellite environment with low data rates to provide equivalent levels of quality of experience enjoyed by subscribers of circuit switched systems. In this article, we first provide an overview of Circuit Switched and IMS Packet Switched based call flows for mobile satellite systems. We then concentrate specifically on voice call setup time and show how Circuit Switched architecture provides significantly better performance. Lastly, we propose several advancements on SIP call signaling to improve the IMS Packet Switched call setup times.","PeriodicalId":137382,"journal":{"name":"2008 IEEE International Workshop on Satellite and Space Communications","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125907841","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 : 2008-10-24DOI: 10.1109/IWSSC.2008.4656808
M. Smolnikar, A. Aroumont, M. Mohorčič, T. Javornik, L. Castanet
For satellite systems offering broadband and telecom services at Ka band frequencies and above Fade Mitigation Techniques (FMT), in particular Adaptive Modulation and Coding (ACM), are essential to improve the system capacity. One of the important aspects of ACM from a physical and MAC layer perspective is the choice of transmission modes to be used during the system operation that would achieve the optimal trade-off between the system complexity and performance. This paper deals with one such methodology of selecting the appropriate set of transmission modes (MODCOD subset) from a physical layer point of view for both DVB-S2 and extended DVB-RCS systems. Optimizing the achievable spectral efficiency with respect to implementation complexity has been the main focus of the proposed methodology. In particular, we show that subsets with 8 and 5 transmission modes provide best trade-off between the complexity of the ACM based system and the achieved average spectral efficiency for the forward and return link of the DVB-S2/RCS system respectively.
{"title":"On transmission modes subset selection in DVB-S2/RCS satellite systems","authors":"M. Smolnikar, A. Aroumont, M. Mohorčič, T. Javornik, L. Castanet","doi":"10.1109/IWSSC.2008.4656808","DOIUrl":"https://doi.org/10.1109/IWSSC.2008.4656808","url":null,"abstract":"For satellite systems offering broadband and telecom services at Ka band frequencies and above Fade Mitigation Techniques (FMT), in particular Adaptive Modulation and Coding (ACM), are essential to improve the system capacity. One of the important aspects of ACM from a physical and MAC layer perspective is the choice of transmission modes to be used during the system operation that would achieve the optimal trade-off between the system complexity and performance. This paper deals with one such methodology of selecting the appropriate set of transmission modes (MODCOD subset) from a physical layer point of view for both DVB-S2 and extended DVB-RCS systems. Optimizing the achievable spectral efficiency with respect to implementation complexity has been the main focus of the proposed methodology. In particular, we show that subsets with 8 and 5 transmission modes provide best trade-off between the complexity of the ACM based system and the achieved average spectral efficiency for the forward and return link of the DVB-S2/RCS system respectively.","PeriodicalId":137382,"journal":{"name":"2008 IEEE International Workshop on Satellite and Space Communications","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130102758","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 : 2008-10-24DOI: 10.1109/IWSSC.2008.4656777
Panos Papadimitratos, A. Jovanovic
An increasing number of mobile applications and services require that devices are aware of their location. Global navigation satellite systems (GNSS) are the predominant enabling technology. But location information provided by commercial GNSS is not secure, unlike what is the usual assumption. There are only few exceptions in the literature that present GNSS vulnerabilities. In this paper, we contribute the first detailed quantitative analysis of attacks against GNSS-based localization. We show how replay attacks against GNSS can have a significant impact: even against cryptographically secured GNSS instantiations, an adversary can manipulate the location and time calculated by victim GNSS receivers. We explain in detail how such attacks can be mounted, measure their impact, and discuss the effectiveness of possible countermeasures.
{"title":"Protection and fundamental vulnerability of GNSS","authors":"Panos Papadimitratos, A. Jovanovic","doi":"10.1109/IWSSC.2008.4656777","DOIUrl":"https://doi.org/10.1109/IWSSC.2008.4656777","url":null,"abstract":"An increasing number of mobile applications and services require that devices are aware of their location. Global navigation satellite systems (GNSS) are the predominant enabling technology. But location information provided by commercial GNSS is not secure, unlike what is the usual assumption. There are only few exceptions in the literature that present GNSS vulnerabilities. In this paper, we contribute the first detailed quantitative analysis of attacks against GNSS-based localization. We show how replay attacks against GNSS can have a significant impact: even against cryptographically secured GNSS instantiations, an adversary can manipulate the location and time calculated by victim GNSS receivers. We explain in detail how such attacks can be mounted, measure their impact, and discuss the effectiveness of possible countermeasures.","PeriodicalId":137382,"journal":{"name":"2008 IEEE International Workshop on Satellite and Space Communications","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127419152","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 : 2008-10-24DOI: 10.1109/IWSSC.2008.4656784
B. de la Cuesta, A. Yun, G. Fairhurst, B. Collini-Nocker, C. Prahauser
Current DVB-RCS systems present an IPv4-interface and no commercial RCS systems have yet offered IPv6 support. This paper explores encapsulation issues for next generation DVB-RCS terminals that will support IPv6. It assess two alternatives: the Unidirectional Lightweight Encapsulation (ULE) and the Generic Stream Encapsulation (GSE). These are shown to improve efficiency and performance and have been evaluated within a regenerative satellite platform test bed.
{"title":"Analysis of IPv6 encapsulation over ULE and MPE using a regenerative satellite payload","authors":"B. de la Cuesta, A. Yun, G. Fairhurst, B. Collini-Nocker, C. Prahauser","doi":"10.1109/IWSSC.2008.4656784","DOIUrl":"https://doi.org/10.1109/IWSSC.2008.4656784","url":null,"abstract":"Current DVB-RCS systems present an IPv4-interface and no commercial RCS systems have yet offered IPv6 support. This paper explores encapsulation issues for next generation DVB-RCS terminals that will support IPv6. It assess two alternatives: the Unidirectional Lightweight Encapsulation (ULE) and the Generic Stream Encapsulation (GSE). These are shown to improve efficiency and performance and have been evaluated within a regenerative satellite platform test bed.","PeriodicalId":137382,"journal":{"name":"2008 IEEE International Workshop on Satellite and Space Communications","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126332494","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 : 2008-10-24DOI: 10.1109/IWSSC.2008.4656746
R. Mort, M. Berioli, H. Cruickshank
The approach currently being taken by ETSI (BSM) in defining future open standards for network management architecture for IP-based broadband multimedia satellite systems is described. This work has recently begun and the final objective is to arrive at a consensus for an architecture which meets the requirements of compatibility and interworking with external networks (e.g. within the NGN) and is flexible enough to meet different operators needs.
{"title":"Network management architectures for broadband satellite multimedia systems","authors":"R. Mort, M. Berioli, H. Cruickshank","doi":"10.1109/IWSSC.2008.4656746","DOIUrl":"https://doi.org/10.1109/IWSSC.2008.4656746","url":null,"abstract":"The approach currently being taken by ETSI (BSM) in defining future open standards for network management architecture for IP-based broadband multimedia satellite systems is described. This work has recently begun and the final objective is to arrive at a consensus for an architecture which meets the requirements of compatibility and interworking with external networks (e.g. within the NGN) and is flexible enough to meet different operators needs.","PeriodicalId":137382,"journal":{"name":"2008 IEEE International Workshop on Satellite and Space Communications","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121329129","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 : 2008-10-24DOI: 10.1109/IWSSC.2008.4656764
P. Inigo, B. Durin, N. Girault, G. Verelst
Today, the digital divide originated by the unequal coverage of regions by terrestrial broadband solutions (xDSL, cable, optic fiber, etc) remains unfortunately an unsolved issue in a number of areas in Europe. Many regional, national and European policies have been defined in order to enable equal access to broadband communications for all citizens in all territories. The present article describes the activities carried out in the framework of the OURSES project that contributes to the development of the Information Society in accordance to these policies by addressing in particular the context of e-health assistance platforms and the satellite and wireless technologies.
{"title":"OURSES: Medical assistance over satellite","authors":"P. Inigo, B. Durin, N. Girault, G. Verelst","doi":"10.1109/IWSSC.2008.4656764","DOIUrl":"https://doi.org/10.1109/IWSSC.2008.4656764","url":null,"abstract":"Today, the digital divide originated by the unequal coverage of regions by terrestrial broadband solutions (xDSL, cable, optic fiber, etc) remains unfortunately an unsolved issue in a number of areas in Europe. Many regional, national and European policies have been defined in order to enable equal access to broadband communications for all citizens in all territories. The present article describes the activities carried out in the framework of the OURSES project that contributes to the development of the Information Society in accordance to these policies by addressing in particular the context of e-health assistance platforms and the satellite and wireless technologies.","PeriodicalId":137382,"journal":{"name":"2008 IEEE International Workshop on Satellite and Space Communications","volume":"233 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115749218","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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