Pub Date : 2007-12-26DOI: 10.1109/IWSSC.2007.4409388
O. Korcak, F. Alagoz
In this paper we investigate the beam management issue for providing optimal mapping between ground and space terminals in earth-fixed satellite systems. We take the non-homogeneity of the traffic demands into account and define an optimal beam management problem for supplying more bandwidth to denser areas. We model the problem as a network flow problem and propose a feasible solution approach. Performance results show that significant improvement in system availability can be achieved at the expense of acceptable increase in the system cost.
{"title":"Optimal Beam Management in Earth-fixed Satellite Systems","authors":"O. Korcak, F. Alagoz","doi":"10.1109/IWSSC.2007.4409388","DOIUrl":"https://doi.org/10.1109/IWSSC.2007.4409388","url":null,"abstract":"In this paper we investigate the beam management issue for providing optimal mapping between ground and space terminals in earth-fixed satellite systems. We take the non-homogeneity of the traffic demands into account and define an optimal beam management problem for supplying more bandwidth to denser areas. We model the problem as a network flow problem and propose a feasible solution approach. Performance results show that significant improvement in system availability can be achieved at the expense of acceptable increase in the system cost.","PeriodicalId":286578,"journal":{"name":"2007 International Workshop on Satellite and Space Communications","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-12-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124975778","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 : 2007-12-26DOI: 10.1109/IWSSC.2007.4409424
M. Noisternig, B. Collini-Nocker
The unidirectional lightweight encapsulation (ULE) protocol is an efficient and extensible wrapper mechanism for IP over MPEG-2 networks. Such networks are typically operated on broadcast wireless channels and are thus specifically vulnerable to attacks. Passive attacks, such as eaves-dropping, are simple to perform and emphasize the importance for security and support within ULE. In this paper a mandatory security extension for the ULE protocol is discussed that is designed with the aim of being conservative in bandwidth consumption and lightweight in the sense that it allows for implementation in low-cost, resource- scarce (mobile) receiver devices. The focus of this work is on two aspects of a complete ULE security framework: the format of the security extension.
{"title":"A lightweight security extension for ULE","authors":"M. Noisternig, B. Collini-Nocker","doi":"10.1109/IWSSC.2007.4409424","DOIUrl":"https://doi.org/10.1109/IWSSC.2007.4409424","url":null,"abstract":"The unidirectional lightweight encapsulation (ULE) protocol is an efficient and extensible wrapper mechanism for IP over MPEG-2 networks. Such networks are typically operated on broadcast wireless channels and are thus specifically vulnerable to attacks. Passive attacks, such as eaves-dropping, are simple to perform and emphasize the importance for security and support within ULE. In this paper a mandatory security extension for the ULE protocol is discussed that is designed with the aim of being conservative in bandwidth consumption and lightweight in the sense that it allows for implementation in low-cost, resource- scarce (mobile) receiver devices. The focus of this work is on two aspects of a complete ULE security framework: the format of the security extension.","PeriodicalId":286578,"journal":{"name":"2007 International Workshop on Satellite and Space Communications","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-12-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131268258","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 : 2007-12-26DOI: 10.1109/IWSSC.2007.4409420
M. Papaleo, R. Firrincieli, G. Corazza, A. Vanelli-Coralli
Digital video broadcasting through satellite transmission will provide new services to aeronautical, railway and maritime mobile terminals. However, mobile channel impairments request effective countermeasures to improve the C/N performance and counteract Doppler spread. The paper investigates the application of MPE-FEC (multi protocol encapsulation -forward error correction) to DVB-S2 standard chain for railway applications. In this scenario, trellis power arches may introduce deep fading events which cause bursts of data losses. An analytical model describing MPE-FEC decoder performance has been derived and validated through numerical simulation considering different train speed values, MOD-COD (modulation order and physical layer coding rate) configurations and number of rows in the MPE-FEC frame. Results show that, depending on the train speed, enlarging the number of rows or adopting a sliding encoding mechanism are effective in counteracting power arches impairments.
{"title":"On The Application of MPE-FEC to Mobile DVB-S2: Performance Evaluation in Deep Fading Conditions","authors":"M. Papaleo, R. Firrincieli, G. Corazza, A. Vanelli-Coralli","doi":"10.1109/IWSSC.2007.4409420","DOIUrl":"https://doi.org/10.1109/IWSSC.2007.4409420","url":null,"abstract":"Digital video broadcasting through satellite transmission will provide new services to aeronautical, railway and maritime mobile terminals. However, mobile channel impairments request effective countermeasures to improve the C/N performance and counteract Doppler spread. The paper investigates the application of MPE-FEC (multi protocol encapsulation -forward error correction) to DVB-S2 standard chain for railway applications. In this scenario, trellis power arches may introduce deep fading events which cause bursts of data losses. An analytical model describing MPE-FEC decoder performance has been derived and validated through numerical simulation considering different train speed values, MOD-COD (modulation order and physical layer coding rate) configurations and number of rows in the MPE-FEC frame. Results show that, depending on the train speed, enlarging the number of rows or adopting a sliding encoding mechanism are effective in counteracting power arches impairments.","PeriodicalId":286578,"journal":{"name":"2007 International Workshop on Satellite and Space Communications","volume":"43 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-12-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114237403","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 : 2007-12-26DOI: 10.1109/IWSSC.2007.4409387
Paolo Chini, G. Giambene, S. Marchi
The aim of this paper is to investigate QoS in a hybrid satellite-WiFi network and to study mapping issues in the interconnection of these two segments. We have considered both a DVB-RCS-based satellite network and a wireless system based on IEEE 802.11e. Both TCP-based and UDP-based traffic flows are considered. In the satellite network, a dynamic bandwidth allocation scheme is used that is managed by a network control center: differentiated QoS support is guaranteed by the use of separate queues at the Gateway for distinct traffic classes. An ns-2-based simulator has been implemented to study the hybrid scenario. We have been able to show the impact of both different traffic mapping solutions in the interconnection of the network segment and different channel condition on the TCP performance.
{"title":"QoS Support in Hybrid WiFi and DVB-S Networks","authors":"Paolo Chini, G. Giambene, S. Marchi","doi":"10.1109/IWSSC.2007.4409387","DOIUrl":"https://doi.org/10.1109/IWSSC.2007.4409387","url":null,"abstract":"The aim of this paper is to investigate QoS in a hybrid satellite-WiFi network and to study mapping issues in the interconnection of these two segments. We have considered both a DVB-RCS-based satellite network and a wireless system based on IEEE 802.11e. Both TCP-based and UDP-based traffic flows are considered. In the satellite network, a dynamic bandwidth allocation scheme is used that is managed by a network control center: differentiated QoS support is guaranteed by the use of separate queues at the Gateway for distinct traffic classes. An ns-2-based simulator has been implemented to study the hybrid scenario. We have been able to show the impact of both different traffic mapping solutions in the interconnection of the network segment and different channel condition on the TCP performance.","PeriodicalId":286578,"journal":{"name":"2007 International Workshop on Satellite and Space Communications","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-12-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130452341","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 : 2007-12-26DOI: 10.1109/IWSSC.2007.4409408
G. Liva, M. Chiani, M. Berioli, S. Scalise
In this paper we provide some novel design techniques for sparse-graph-based erasure correcting codes. The paper is focused on codes based on sparse graph belonging to the category of the so-called generalized low-density parity-check (G-LDPC) codes. Some design insights are provided for multi-edge type G-LDPC codes based on protographs. The performance assessment of some G-LDPC codes is carried out by use of both simulation and analytic tools, showing the capacity-approaching performance of the presented code designs on the uncorrelated binary erasure channel.
{"title":"Some Remarks on Sparse Graph Codes for Packet Loss Recovery","authors":"G. Liva, M. Chiani, M. Berioli, S. Scalise","doi":"10.1109/IWSSC.2007.4409408","DOIUrl":"https://doi.org/10.1109/IWSSC.2007.4409408","url":null,"abstract":"In this paper we provide some novel design techniques for sparse-graph-based erasure correcting codes. The paper is focused on codes based on sparse graph belonging to the category of the so-called generalized low-density parity-check (G-LDPC) codes. Some design insights are provided for multi-edge type G-LDPC codes based on protographs. The performance assessment of some G-LDPC codes is carried out by use of both simulation and analytic tools, showing the capacity-approaching performance of the presented code designs on the uncorrelated binary erasure channel.","PeriodicalId":286578,"journal":{"name":"2007 International Workshop on Satellite and Space Communications","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-12-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130963287","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 : 2007-12-26DOI: 10.1109/IWSSC.2007.4409390
S. Janaaththanan, C. Kasparis, B. Evans
Single carrier frequency division multiple access (SC-FDMA), a multiple access technique similar to orthogonal frequency division multiple access (OFDMA), presently features as a strong candidate in the return link of the long time evolution (LTE) of T-UMTS. In the satellite domain there is an emerging research interest in extending mobile broadcasting system architectures that include complementary ground components, in providing bi-directional data services to mobile users. In such 'evolved S-UMTS' architecture, compatibility with current (CDMA based) and future (OFDMA/SC-FDMA) based) T-UMTS physical layer techniques is of high relevance, if satellite networks are to assume a complementary role to terrestrial ones. In this paper, we first give an overview of SC-FDMA and then compare, via simulations, the performance of the technique with that of the WCDMA-based high speed uplink packet access (HSUPA) that has been defined in release 6 of T-UMTS. The performance evaluations are performed over channels that are representative of the evolved S-UMTS architectures. Emphasis in the study is also given to realistic channel estimation and taking into account the effects of the amplifier's non-linearity. Other elements addressed in this paper are the impact of linearization techniques, and the pilot channel design in order to achieve robust estimation in the presence of non-linear channels.
{"title":"Comparison of SC-FDMA and HSUPA in the Return-Link of Evolved S-UMTS Architecture","authors":"S. Janaaththanan, C. Kasparis, B. Evans","doi":"10.1109/IWSSC.2007.4409390","DOIUrl":"https://doi.org/10.1109/IWSSC.2007.4409390","url":null,"abstract":"Single carrier frequency division multiple access (SC-FDMA), a multiple access technique similar to orthogonal frequency division multiple access (OFDMA), presently features as a strong candidate in the return link of the long time evolution (LTE) of T-UMTS. In the satellite domain there is an emerging research interest in extending mobile broadcasting system architectures that include complementary ground components, in providing bi-directional data services to mobile users. In such 'evolved S-UMTS' architecture, compatibility with current (CDMA based) and future (OFDMA/SC-FDMA) based) T-UMTS physical layer techniques is of high relevance, if satellite networks are to assume a complementary role to terrestrial ones. In this paper, we first give an overview of SC-FDMA and then compare, via simulations, the performance of the technique with that of the WCDMA-based high speed uplink packet access (HSUPA) that has been defined in release 6 of T-UMTS. The performance evaluations are performed over channels that are representative of the evolved S-UMTS architectures. Emphasis in the study is also given to realistic channel estimation and taking into account the effects of the amplifier's non-linearity. Other elements addressed in this paper are the impact of linearization techniques, and the pilot channel design in order to achieve robust estimation in the presence of non-linear channels.","PeriodicalId":286578,"journal":{"name":"2007 International Workshop on Satellite and Space Communications","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-12-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114814257","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 : 2007-12-26DOI: 10.1109/IWSSC.2007.4409422
R. Asorey-Cacheda, N. Courville, F. González-Castaño, H. Bischl
In this paper, we review different architectures for near video-on-demand (NVoD) systems on satellite networks. In many scenarios, satellites are the only available option for content distribution. On the other hand, video-on-demand (VoD) has been a topic of intense research in the past. The main problem of VoD systems is that their bandwidth requirements do not scale well with user requests. For this reason, VoD is only feasible under some constraints. In general, NVoD systems are an approximation of VoD ones. In them, downloads do not necessarily start when the request arrives, but some time later. By doing so, it is possible to bound the total required bandwidth at the cost of introducing some delay in content download.
{"title":"A Survey and Perspective on NVoD Systems for Satellite Networks","authors":"R. Asorey-Cacheda, N. Courville, F. González-Castaño, H. Bischl","doi":"10.1109/IWSSC.2007.4409422","DOIUrl":"https://doi.org/10.1109/IWSSC.2007.4409422","url":null,"abstract":"In this paper, we review different architectures for near video-on-demand (NVoD) systems on satellite networks. In many scenarios, satellites are the only available option for content distribution. On the other hand, video-on-demand (VoD) has been a topic of intense research in the past. The main problem of VoD systems is that their bandwidth requirements do not scale well with user requests. For this reason, VoD is only feasible under some constraints. In general, NVoD systems are an approximation of VoD ones. In them, downloads do not necessarily start when the request arrives, but some time later. By doing so, it is possible to bound the total required bandwidth at the cost of introducing some delay in content download.","PeriodicalId":286578,"journal":{"name":"2007 International Workshop on Satellite and Space Communications","volume":"89 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-12-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116186483","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 : 2007-12-26DOI: 10.1109/IWSSC.2007.4409425
Sooyoung Kim, S. Kota
In this paper, we discuss recent standardization activities in the ITU-R Working Party (WP) 4B. The charter of WP 4B includes developing the Recommendations for fixed satellite systems performance. Currently, the working party is involved in, developing IP-based satellite network performance, transmission control protocol (TCP) over satellite, air interface, error performance objectives, digital performance and disaster recovery applications of satellites. To reflect the state-of-the-art technologies meeting the emerging user applications we describe the satellite network performance activities related to next generation systems. Following the discussion on the completed recommendations, we provide a brief account of the current recommendation developing efforts including quality of service and hybrid networking for emerging communication services.
{"title":"ITU-R Standardization of Fixed Satellite Services (FSS)","authors":"Sooyoung Kim, S. Kota","doi":"10.1109/IWSSC.2007.4409425","DOIUrl":"https://doi.org/10.1109/IWSSC.2007.4409425","url":null,"abstract":"In this paper, we discuss recent standardization activities in the ITU-R Working Party (WP) 4B. The charter of WP 4B includes developing the Recommendations for fixed satellite systems performance. Currently, the working party is involved in, developing IP-based satellite network performance, transmission control protocol (TCP) over satellite, air interface, error performance objectives, digital performance and disaster recovery applications of satellites. To reflect the state-of-the-art technologies meeting the emerging user applications we describe the satellite network performance activities related to next generation systems. Following the discussion on the completed recommendations, we provide a brief account of the current recommendation developing efforts including quality of service and hybrid networking for emerging communication services.","PeriodicalId":286578,"journal":{"name":"2007 International Workshop on Satellite and Space Communications","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-12-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122552672","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 : 2007-12-26DOI: 10.1109/IWSSC.2007.4409407
H. Tsunoda, N. Kato, Abbas Jamalipour, Y. Nemoto
In this paper, we evaluate the performance of stream control transmission protocol (SCTP) with adaptive multistreaming which we had previously proposed. This proposed modification can be useful for the resource limited mobile terminals in LEO satellite networks. In the proposed modification, a SCTP sender adaptively enables or disables multistreaming based on the comparison between the estimate of available bandwidth and current congestion window size. By doing this, user terminals use multistreaming feature appropriately and can avoid waste of resource caused by unnecessary use of multistreaming. In this paper, we propose a further modification to the adaptive multistreaming and evaluate its performance.
{"title":"Performance Evaluation of SCTP wth Adaptive Multistreamiing over LEO Satellite Networks","authors":"H. Tsunoda, N. Kato, Abbas Jamalipour, Y. Nemoto","doi":"10.1109/IWSSC.2007.4409407","DOIUrl":"https://doi.org/10.1109/IWSSC.2007.4409407","url":null,"abstract":"In this paper, we evaluate the performance of stream control transmission protocol (SCTP) with adaptive multistreaming which we had previously proposed. This proposed modification can be useful for the resource limited mobile terminals in LEO satellite networks. In the proposed modification, a SCTP sender adaptively enables or disables multistreaming based on the comparison between the estimate of available bandwidth and current congestion window size. By doing this, user terminals use multistreaming feature appropriately and can avoid waste of resource caused by unnecessary use of multistreaming. In this paper, we propose a further modification to the adaptive multistreaming and evaluate its performance.","PeriodicalId":286578,"journal":{"name":"2007 International Workshop on Satellite and Space Communications","volume":"48 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-12-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124636640","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 : 2007-12-26DOI: 10.1109/IWSSC.2007.4409403
A. Soro, J. Lacan, E. Chaput, C. Donny, C. Baudoin
Header compression techniques are now widely used in wireless and satellite communications. The main drawback of these techniques is to weaken the transmission against bit error or packet losses. Indeed, a corrupted or missing header can lead to a non-decompression of consecutive packets and then to a disconnection until the reception of a non-compressed packet. The parameters of the header compression system should then be carefully determined. In this paper, we first review the main header compression protocols standardized for a unidirectional link. This analysis allows us to build a simple generic header compression model depending on few parameters characterizing a header compression protocol. The evaluation of this model in cases corresponding to particular applications allows us to draw some first lessons for the use of header compression in Satellite communications.
{"title":"Evaluation of a Generic Unidirectional Header Compression Protocol","authors":"A. Soro, J. Lacan, E. Chaput, C. Donny, C. Baudoin","doi":"10.1109/IWSSC.2007.4409403","DOIUrl":"https://doi.org/10.1109/IWSSC.2007.4409403","url":null,"abstract":"Header compression techniques are now widely used in wireless and satellite communications. The main drawback of these techniques is to weaken the transmission against bit error or packet losses. Indeed, a corrupted or missing header can lead to a non-decompression of consecutive packets and then to a disconnection until the reception of a non-compressed packet. The parameters of the header compression system should then be carefully determined. In this paper, we first review the main header compression protocols standardized for a unidirectional link. This analysis allows us to build a simple generic header compression model depending on few parameters characterizing a header compression protocol. The evaluation of this model in cases corresponding to particular applications allows us to draw some first lessons for the use of header compression in Satellite communications.","PeriodicalId":286578,"journal":{"name":"2007 International Workshop on Satellite and Space Communications","volume":"281 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-12-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123269842","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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