Pub Date : 2009-10-13DOI: 10.1109/IWSSC.2009.5286355
C. Kissling
{"title":"Regular session 4 (room E) transport and quality of service I","authors":"C. Kissling","doi":"10.1109/IWSSC.2009.5286355","DOIUrl":"https://doi.org/10.1109/IWSSC.2009.5286355","url":null,"abstract":"","PeriodicalId":137431,"journal":{"name":"2009 International Workshop on Satellite and Space Communications","volume":"29 10","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-10-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114136344","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 : 2009-10-13DOI: 10.1109/IWSSC.2009.5286348
T. Pérennou, A. Bouabdallah, A. Brunstrom, Johan Garcia, Per Hurtig
Distributed applications and transport protocols communicating over a satellite link may react very strongly to conditions specific to that kind of link. Providing an evaluation framework to allow tests of real implementations of such software in that context is quite a challenging task. In this paper we show how the use of the general-purpose KauNet IP-level emulator combined with satellite-specific packet loss patterns can help by reproducing losses and delays experienced on a satellite link with a simple Ethernet LAN setup. We also describe a simple experimentation platform and how a typical demonstration is carried out. Such a platform is an essential tool for developers performing continuous testing as they provide new features for e.g. video codecs or transport-level software like DCCP and its congestion control components.
{"title":"IP-level satellite link emulation with KauNet","authors":"T. Pérennou, A. Bouabdallah, A. Brunstrom, Johan Garcia, Per Hurtig","doi":"10.1109/IWSSC.2009.5286348","DOIUrl":"https://doi.org/10.1109/IWSSC.2009.5286348","url":null,"abstract":"Distributed applications and transport protocols communicating over a satellite link may react very strongly to conditions specific to that kind of link. Providing an evaluation framework to allow tests of real implementations of such software in that context is quite a challenging task. In this paper we show how the use of the general-purpose KauNet IP-level emulator combined with satellite-specific packet loss patterns can help by reproducing losses and delays experienced on a satellite link with a simple Ethernet LAN setup. We also describe a simple experimentation platform and how a typical demonstration is carried out. Such a platform is an essential tool for developers performing continuous testing as they provide new features for e.g. video codecs or transport-level software like DCCP and its congestion control components.","PeriodicalId":137431,"journal":{"name":"2009 International Workshop on Satellite and Space Communications","volume":"220 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-10-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134350955","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 : 2009-10-13DOI: 10.1109/IWSSC.2009.5286378
P. Vyskočil, J. Sebesta
This paper is focused on the measurement and evaluation of the relative timing characteristics of GPS (Global Positioning System) timing receivers for time synchronization application. I-Lotus M12M oncore timing modules optimized for the timing applications were utilized as tested timing modules. These modules represent the next generation of the low cost GPS timing receivers which expect accuracy of time synchronization to the so-called Universal Time Coordinated (UTC) in the nanoseconds. The previous generation of receivers was M12+ oncore. Measurement was realized with two M12M timing receivers to obtain their relative time error. The relative time differences between generated 1PPS (one pulse per second) output signals (between rising edges of the pulses) and also 100PPS signals were measured. Error from UTC time was not needed to know but only relative time error between generated 1PPS (100 PPS) signals by the receivers. From the viewpoint of these receiver's application for precise time synchronization measured date are presented and statistically evaluated. The aim of using such timing system is a precision signal marking in different known locations.
{"title":"Relative timing characteristics of GPS timing modules for time synchronization application","authors":"P. Vyskočil, J. Sebesta","doi":"10.1109/IWSSC.2009.5286378","DOIUrl":"https://doi.org/10.1109/IWSSC.2009.5286378","url":null,"abstract":"This paper is focused on the measurement and evaluation of the relative timing characteristics of GPS (Global Positioning System) timing receivers for time synchronization application. I-Lotus M12M oncore timing modules optimized for the timing applications were utilized as tested timing modules. These modules represent the next generation of the low cost GPS timing receivers which expect accuracy of time synchronization to the so-called Universal Time Coordinated (UTC) in the nanoseconds. The previous generation of receivers was M12+ oncore. Measurement was realized with two M12M timing receivers to obtain their relative time error. The relative time differences between generated 1PPS (one pulse per second) output signals (between rising edges of the pulses) and also 100PPS signals were measured. Error from UTC time was not needed to know but only relative time error between generated 1PPS (100 PPS) signals by the receivers. From the viewpoint of these receiver's application for precise time synchronization measured date are presented and statistically evaluated. The aim of using such timing system is a precision signal marking in different known locations.","PeriodicalId":137431,"journal":{"name":"2009 International Workshop on Satellite and Space Communications","volume":"394 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-10-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130475616","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 : 2009-10-13DOI: 10.1109/IWSSC.2009.5286343
D. Lopez-Pacheco, E. Lochin
Router-assisted congestion control protocols, also known as Explicit Rate Notification (ERN) protocols, implement complex algorithms inside a router in order to provide both high link utilization and high fairness. Thus, router-assisted approaches overcome most of the end-to-end protocols problems in large bandwidth-delay product networks. Today, router-assisted protocols cannot be deployed in heterogeneous networks (e.g., Internet) due to their non-compliance with current network protocols. Nevertheless, these approaches can be deployed in satellite networks in the context of splitting PEPs. In this work, as router-assisted protocols can use TCP algorithms to enable reliability, we aim at understanding and providing a detailed view of the impact of such algorithms on the performance obtained by router-assisted protocols over satellite links. In particular, we both study XCP and P-XCP proposals over long delay, lossy and asymmetric links and propose an ns-2 implementation of the P-XCP protocol to the satellite community. To the best of our knowledge, this study is the first one which tackles the impact of TCP internal mechanisms on XCP protocol. Our main conclusion is that P-XCP on TCP New Reno Slow But Steady variant is to date, the most optimal configuration for satellite proxies.
{"title":"Optimal configuration for satellite PEPs using a reliable service on top of a routers-assisted approach","authors":"D. Lopez-Pacheco, E. Lochin","doi":"10.1109/IWSSC.2009.5286343","DOIUrl":"https://doi.org/10.1109/IWSSC.2009.5286343","url":null,"abstract":"Router-assisted congestion control protocols, also known as Explicit Rate Notification (ERN) protocols, implement complex algorithms inside a router in order to provide both high link utilization and high fairness. Thus, router-assisted approaches overcome most of the end-to-end protocols problems in large bandwidth-delay product networks. Today, router-assisted protocols cannot be deployed in heterogeneous networks (e.g., Internet) due to their non-compliance with current network protocols. Nevertheless, these approaches can be deployed in satellite networks in the context of splitting PEPs. In this work, as router-assisted protocols can use TCP algorithms to enable reliability, we aim at understanding and providing a detailed view of the impact of such algorithms on the performance obtained by router-assisted protocols over satellite links. In particular, we both study XCP and P-XCP proposals over long delay, lossy and asymmetric links and propose an ns-2 implementation of the P-XCP protocol to the satellite community. To the best of our knowledge, this study is the first one which tackles the impact of TCP internal mechanisms on XCP protocol. Our main conclusion is that P-XCP on TCP New Reno Slow But Steady variant is to date, the most optimal configuration for satellite proxies.","PeriodicalId":137431,"journal":{"name":"2009 International Workshop on Satellite and Space Communications","volume":"130 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-10-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132701585","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 : 2009-10-13DOI: 10.1109/IWSSC.2009.5286420
B. de la Cuesta, A. Yun, A. Solano
The convergence between fixed and mobile network is the new paradigm in the world wide telecommunications network. Satellites are striving to become an important actor in the Next Generation Networks (NGN) by offering seamless integration with the terrestrial networks. Satellite systems can also provide the right complement in the convergence as one more access network that can cover vast regions and sparsely populates areas, or in areas where terrestrial systems have been destroyed by a recent disaster. DVB-RCS (Digital Video Broadcast - Return Channel Satellite) broadband satellite multimedia systems [8] have a great potential, particularly in this direction, primarily due to the many possible solutions aimed at increasing the efficiency of bandwidth usage and SLA adaptations.
{"title":"DVB-RCS systems in the NGN convergence framework","authors":"B. de la Cuesta, A. Yun, A. Solano","doi":"10.1109/IWSSC.2009.5286420","DOIUrl":"https://doi.org/10.1109/IWSSC.2009.5286420","url":null,"abstract":"The convergence between fixed and mobile network is the new paradigm in the world wide telecommunications network. Satellites are striving to become an important actor in the Next Generation Networks (NGN) by offering seamless integration with the terrestrial networks. Satellite systems can also provide the right complement in the convergence as one more access network that can cover vast regions and sparsely populates areas, or in areas where terrestrial systems have been destroyed by a recent disaster. DVB-RCS (Digital Video Broadcast - Return Channel Satellite) broadband satellite multimedia systems [8] have a great potential, particularly in this direction, primarily due to the many possible solutions aimed at increasing the efficiency of bandwidth usage and SLA adaptations.","PeriodicalId":137431,"journal":{"name":"2009 International Workshop on Satellite and Space Communications","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-10-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117266027","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 : 2009-10-13DOI: 10.1109/IWSSC.2009.5286329
D. Pradas, Lei Jiang, M. Vazquez Castro, P. Barsocchi, F. Potortì
This paper aims at providing different cost-efficient solutions for the channel impairments in tropical areas. In order to extend service to isolated areas, we propose an hybrid architecture based on DVB-S2/RCS + Wi-Fi networks. In this scenario, the delay of the ACM reaction to fade changes can affect the quality of the video transmission, especially because of the characteristics of tropical deep fading events. In order to avoid QoS reduction, we focus on the DVB PHY-layer shifted threshold, which we study not only for different Amazon areas and different rain conditions, but also for different reaction delays. The performance of the PHY-layer selector is evaluated in terms of video quality (PSNR), packet error rate and bandwidth efficiency.
{"title":"Satellite PHY-layer selector design for video applications in tropical areas","authors":"D. Pradas, Lei Jiang, M. Vazquez Castro, P. Barsocchi, F. Potortì","doi":"10.1109/IWSSC.2009.5286329","DOIUrl":"https://doi.org/10.1109/IWSSC.2009.5286329","url":null,"abstract":"This paper aims at providing different cost-efficient solutions for the channel impairments in tropical areas. In order to extend service to isolated areas, we propose an hybrid architecture based on DVB-S2/RCS + Wi-Fi networks. In this scenario, the delay of the ACM reaction to fade changes can affect the quality of the video transmission, especially because of the characteristics of tropical deep fading events. In order to avoid QoS reduction, we focus on the DVB PHY-layer shifted threshold, which we study not only for different Amazon areas and different rain conditions, but also for different reaction delays. The performance of the PHY-layer selector is evaluated in terms of video quality (PSNR), packet error rate and bandwidth efficiency.","PeriodicalId":137431,"journal":{"name":"2009 International Workshop on Satellite and Space Communications","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-10-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124485996","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 : 2009-10-13DOI: 10.1109/IWSSC.2009.5286374
F. Nadeem, E. Leitgeb, M. S. Awan, G. Kandus
The benefits of Free space Optics (FSO) motivates to use it for future high data rate demanding communication applications. However, widespread growth of the technology has been hampered by reduced availability due to weather influences on the link. The fog has been analysed as the most detrimental for FSO communication. There are some models that predict fog attenuation in terms of visibility. These models are compared with measured attenuation data. The comparison has been in terms of Mean Square Error (MSE).
{"title":"Comparison of different models for prediction of attenuation from visibility data","authors":"F. Nadeem, E. Leitgeb, M. S. Awan, G. Kandus","doi":"10.1109/IWSSC.2009.5286374","DOIUrl":"https://doi.org/10.1109/IWSSC.2009.5286374","url":null,"abstract":"The benefits of Free space Optics (FSO) motivates to use it for future high data rate demanding communication applications. However, widespread growth of the technology has been hampered by reduced availability due to weather influences on the link. The fog has been analysed as the most detrimental for FSO communication. There are some models that predict fog attenuation in terms of visibility. These models are compared with measured attenuation data. The comparison has been in terms of Mean Square Error (MSE).","PeriodicalId":137431,"journal":{"name":"2009 International Workshop on Satellite and Space Communications","volume":"87 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-10-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122045226","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 : 2009-10-13DOI: 10.1109/IWSSC.2009.5286427
E. Lutz, A. Donner
SatNEx aims to overcome the fragmentation in Europe's satellite communications research by bringing together Europe's leading academic institutions and research organisations in a cohesive and durable way. This paper gives an overview over the first two phases of the SatNEx Network of Excellence project, as well as an outlook to the extension, SatNEx-III, planned for the years 2009 – 2012.
{"title":"The Satellite Communications Network of Excellence “SatNEx”","authors":"E. Lutz, A. Donner","doi":"10.1109/IWSSC.2009.5286427","DOIUrl":"https://doi.org/10.1109/IWSSC.2009.5286427","url":null,"abstract":"SatNEx aims to overcome the fragmentation in Europe's satellite communications research by bringing together Europe's leading academic institutions and research organisations in a cohesive and durable way. This paper gives an overview over the first two phases of the SatNEx Network of Excellence project, as well as an outlook to the extension, SatNEx-III, planned for the years 2009 – 2012.","PeriodicalId":137431,"journal":{"name":"2009 International Workshop on Satellite and Space Communications","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-10-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130308284","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 : 2009-10-13DOI: 10.1109/IWSSC.2009.5286361
A. Rathke, C. Jentsch, O. Wallner
We review future interplanetary missions with the goal of identifying the major drivers for the communication and navigation systems. For a set of 13 characteristic mission scenarios we analyze the communication and navigation architecture and identify the hardware requirements and limiting elements on both, space segment and ground segment. Trends for the design of the communication and navigation systems are identified and analyzed. Special attention is paid to the introduction of advanced concepts such as optical communication and autonomous navigation. The identified design drivers of the communication and navigation systems may serve as a guideline for future technology development activities.
{"title":"The drivers for future interplanetary communication and navigation","authors":"A. Rathke, C. Jentsch, O. Wallner","doi":"10.1109/IWSSC.2009.5286361","DOIUrl":"https://doi.org/10.1109/IWSSC.2009.5286361","url":null,"abstract":"We review future interplanetary missions with the goal of identifying the major drivers for the communication and navigation systems. For a set of 13 characteristic mission scenarios we analyze the communication and navigation architecture and identify the hardware requirements and limiting elements on both, space segment and ground segment. Trends for the design of the communication and navigation systems are identified and analyzed. Special attention is paid to the introduction of advanced concepts such as optical communication and autonomous navigation. The identified design drivers of the communication and navigation systems may serve as a guideline for future technology development activities.","PeriodicalId":137431,"journal":{"name":"2009 International Workshop on Satellite and Space Communications","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-10-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132296911","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 : 2009-10-13DOI: 10.1109/IWSSC.2009.5286352
P. Pech, Puming Huang, M. Bousquet, M. Robert, A. Duverdier
This paper describes a DVB-S2 based adaptive air interface designed to meet the performance constraints of bidirectional satellite communication links to be established in a post-disaster emergency situation in Ku/Ka and Q/V bands where strong channel impairments occur. The proposed solution allows to establish very quickly a minimal low bit rate satellite return link, using the available resources of a primary geostationary satellite system, and very small, low-cost and power-limited dedicated ground terminals. The focus is placed on: (i) the principle and performance analysis of the adaptive strategy that was devised using the DVB-S2 modulation and coding (ACM) scheme along with other techniques, (ii) the implementation of the transmission channel simulation model within the Juzzle open source environment software, and (iii) the preliminary simulation results obtained.
{"title":"Simulation of an adaptive strategy designed for low bit rate emergency satellite communications links in Ku/Ka/Q/V bands","authors":"P. Pech, Puming Huang, M. Bousquet, M. Robert, A. Duverdier","doi":"10.1109/IWSSC.2009.5286352","DOIUrl":"https://doi.org/10.1109/IWSSC.2009.5286352","url":null,"abstract":"This paper describes a DVB-S2 based adaptive air interface designed to meet the performance constraints of bidirectional satellite communication links to be established in a post-disaster emergency situation in Ku/Ka and Q/V bands where strong channel impairments occur. The proposed solution allows to establish very quickly a minimal low bit rate satellite return link, using the available resources of a primary geostationary satellite system, and very small, low-cost and power-limited dedicated ground terminals. The focus is placed on: (i) the principle and performance analysis of the adaptive strategy that was devised using the DVB-S2 modulation and coding (ACM) scheme along with other techniques, (ii) the implementation of the transmission channel simulation model within the Juzzle open source environment software, and (iii) the preliminary simulation results obtained.","PeriodicalId":137431,"journal":{"name":"2009 International Workshop on Satellite and Space Communications","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-10-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129972164","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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