Pub Date : 2008-10-24DOI: 10.1109/IWSSC.2008.4656810
B. Héder, J. Bitó
In point-multipoint (PmP) systems the signal to interference and noise ratio (SINR) highly depends on the assignment of terminal stations (TS) to base stations (BS). The broadband fixed wireless access (BFWA) systems operate at high carrier frequencies, i.e. microwave domain. In this frequency range wave propagation is highly influenced by precipitation, especially rain. Feeding of base stations can be solved with fiber optic or e.g. with satellite. In this work satellite feeding is assumed, which avoids land demolition caused by fiber deployment, but its drawback is the precipitation attenuation of Earth-space links. Applying site diversity can mitigate rain attenuation effects; however, known site diversity methods are only considering downlink channel quality and during site diversity terminals do not consider decisions of each other. By site diversity when downlink signal level decreases below a threshold, terminal station can be assigned to an other base station, though in point-multipoint systems this base station re-assignment can raise uplink interferences at other terminals. Present contribution provides a special site diversity which adopts genetic algorithm (GA) to simultaneously optimize downlink and uplink SINR values in BFWA. A convergence analysis method of the applied genetic algorithm is provided using Markov chain model.
{"title":"Convergence analysis of genetic algorithm applied for dynamic optimization of terminal to base station assignment in satellite Fed BFWA systems","authors":"B. Héder, J. Bitó","doi":"10.1109/IWSSC.2008.4656810","DOIUrl":"https://doi.org/10.1109/IWSSC.2008.4656810","url":null,"abstract":"In point-multipoint (PmP) systems the signal to interference and noise ratio (SINR) highly depends on the assignment of terminal stations (TS) to base stations (BS). The broadband fixed wireless access (BFWA) systems operate at high carrier frequencies, i.e. microwave domain. In this frequency range wave propagation is highly influenced by precipitation, especially rain. Feeding of base stations can be solved with fiber optic or e.g. with satellite. In this work satellite feeding is assumed, which avoids land demolition caused by fiber deployment, but its drawback is the precipitation attenuation of Earth-space links. Applying site diversity can mitigate rain attenuation effects; however, known site diversity methods are only considering downlink channel quality and during site diversity terminals do not consider decisions of each other. By site diversity when downlink signal level decreases below a threshold, terminal station can be assigned to an other base station, though in point-multipoint systems this base station re-assignment can raise uplink interferences at other terminals. Present contribution provides a special site diversity which adopts genetic algorithm (GA) to simultaneously optimize downlink and uplink SINR values in BFWA. A convergence analysis method of the applied genetic algorithm is provided using Markov chain model.","PeriodicalId":137382,"journal":{"name":"2008 IEEE International Workshop on Satellite and Space Communications","volume":"34 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":"131827011","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.2008.4656790
G. Fairhurst, G. Giambene, S. Giannetti, C. Párraga, A. Sali
DVB-S2 is a second-generation standard for satellite transmissions, developed to improve the performance of DVB-S. Recently, research efforts have been devoted to extend this standard for mobile usage. In this paper we consider a scenario composed of a Ku-band GEO bent-pipe satellite, a gateway and some mobile users. The interest is here in investigating the performance of a scheduling scheme to manage DVB-S2 resources on the forward channel for the delivery of video CBR and FTP traffic flows to mobile users. A novel scheduler scheme, called UBMT, has been proposed that aims to manage CBR packet transmission deadlines while maximizing the aggregated goodput. Simulation runs have permitted to validate the optimal performance achieved by UBMT in comparison with other schemes. The impact of different TCP versions has been investigated as well showing the good results obtained with the SACK option.
{"title":"Multimedia traffic scheduling in DVB-S2 networks with mobile users","authors":"G. Fairhurst, G. Giambene, S. Giannetti, C. Párraga, A. Sali","doi":"10.1109/IWSSC.2008.4656790","DOIUrl":"https://doi.org/10.1109/IWSSC.2008.4656790","url":null,"abstract":"DVB-S2 is a second-generation standard for satellite transmissions, developed to improve the performance of DVB-S. Recently, research efforts have been devoted to extend this standard for mobile usage. In this paper we consider a scenario composed of a Ku-band GEO bent-pipe satellite, a gateway and some mobile users. The interest is here in investigating the performance of a scheduling scheme to manage DVB-S2 resources on the forward channel for the delivery of video CBR and FTP traffic flows to mobile users. A novel scheduler scheme, called UBMT, has been proposed that aims to manage CBR packet transmission deadlines while maximizing the aggregated goodput. Simulation runs have permitted to validate the optimal performance achieved by UBMT in comparison with other schemes. The impact of different TCP versions has been investigated as well showing the good results obtained with the SACK option.","PeriodicalId":137382,"journal":{"name":"2008 IEEE International Workshop on Satellite and Space Communications","volume":"41 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":"122952087","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.2008.4656824
Gürkan Gür, S. Bayhan, F. Alagoz, A. Jamalipour
In this paper, the use of mobile WiMAX (IEEE 802.16e) as terrestrial multicast/broadcast segment for the delivery of multimedia content to mobile users in DVB-SH networks is investigated. The WiMAX multicast/broadcast services (MBS) protocol stack is defined after a brief description of DVB-SH system specifications and multicast/broadcast services in WiMAX. Consequently, the symbiotic mobile WiMAX and DVB-SH architecture is presented and key issues are listed. A modified MBS protocol stack and the functional enhancements for the WiMAX MBS are described for better provisioning of DV-BSH services via mobile WiMAX where satellite coverage is not available.
{"title":"On the use of WiMAX as the terrestrial segment for DVB-SH networks","authors":"Gürkan Gür, S. Bayhan, F. Alagoz, A. Jamalipour","doi":"10.1109/IWSSC.2008.4656824","DOIUrl":"https://doi.org/10.1109/IWSSC.2008.4656824","url":null,"abstract":"In this paper, the use of mobile WiMAX (IEEE 802.16e) as terrestrial multicast/broadcast segment for the delivery of multimedia content to mobile users in DVB-SH networks is investigated. The WiMAX multicast/broadcast services (MBS) protocol stack is defined after a brief description of DVB-SH system specifications and multicast/broadcast services in WiMAX. Consequently, the symbiotic mobile WiMAX and DVB-SH architecture is presented and key issues are listed. A modified MBS protocol stack and the functional enhancements for the WiMAX MBS are described for better provisioning of DV-BSH services via mobile WiMAX where satellite coverage is not available.","PeriodicalId":137382,"journal":{"name":"2008 IEEE International Workshop on Satellite and Space Communications","volume":"74 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":"123008843","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.2008.4656755
J. Lacan, E. Lochin
Delay Tolerant Networking (DTN) is currently an open research area following the interest of space companies in the deployment of Internet protocols for the space Internet. Thus, these last years have seen an increase in the number of DTN protocol proposals such as Saratoga or LTP-T. However, the goal of these protocols are more to send much error-free data during a short contact time rather than operating to a strictly speaking reliable data transfer. Beside this, several research work have proposed efficient acknowledgment schemes based on the SNACK mechanism. However, these acknowledgement strategies are not compliant with the DTN protocol principle. In this paper, we propose a novel reliability mechanism with an implicit acknowledgment strategy that could be used either within these new DTN proposals or in the context of multicast transport protocols. This proposal is based on a new erasure coding concept specifically designed to operate efficient reliable transfer over bi-directional links.
{"title":"Rethinking reliability for long-delay networks","authors":"J. Lacan, E. Lochin","doi":"10.1109/IWSSC.2008.4656755","DOIUrl":"https://doi.org/10.1109/IWSSC.2008.4656755","url":null,"abstract":"Delay Tolerant Networking (DTN) is currently an open research area following the interest of space companies in the deployment of Internet protocols for the space Internet. Thus, these last years have seen an increase in the number of DTN protocol proposals such as Saratoga or LTP-T. However, the goal of these protocols are more to send much error-free data during a short contact time rather than operating to a strictly speaking reliable data transfer. Beside this, several research work have proposed efficient acknowledgment schemes based on the SNACK mechanism. However, these acknowledgement strategies are not compliant with the DTN protocol principle. In this paper, we propose a novel reliability mechanism with an implicit acknowledgment strategy that could be used either within these new DTN proposals or in the context of multicast transport protocols. This proposal is based on a new erasure coding concept specifically designed to operate efficient reliable transfer over bi-directional links.","PeriodicalId":137382,"journal":{"name":"2008 IEEE International Workshop on Satellite and Space Communications","volume":"11 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":"123906987","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.2008.4656765
C. Mailhes, B. Comet, H. Bernard, E. Campo, A. Prieto, S. Bonhomme
ldquoOURSESrdquo project, French acronym for ldquoOffer of Services Rural Use using Satelliterdquo, proposes three telemedicine applications linked to services for elderly people. It focuses particularly on the use of satellites as a complement to terrestrial technologies to ensure the deployment of tele-services in areas where telecommunication infrastructure is lacking. This paper describes the three telemedicine applications which can be viewed as tele-monitoring systems for elderly people.
{"title":"Telemedicine applications in OURSES project","authors":"C. Mailhes, B. Comet, H. Bernard, E. Campo, A. Prieto, S. Bonhomme","doi":"10.1109/IWSSC.2008.4656765","DOIUrl":"https://doi.org/10.1109/IWSSC.2008.4656765","url":null,"abstract":"ldquoOURSESrdquo project, French acronym for ldquoOffer of Services Rural Use using Satelliterdquo, proposes three telemedicine applications linked to services for elderly people. It focuses particularly on the use of satellites as a complement to terrestrial technologies to ensure the deployment of tele-services in areas where telecommunication infrastructure is lacking. This paper describes the three telemedicine applications which can be viewed as tele-monitoring systems for elderly people.","PeriodicalId":137382,"journal":{"name":"2008 IEEE International Workshop on Satellite and Space Communications","volume":"57 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":"122608010","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.2008.4656774
G. Fairhurst, B. Collini-Nocker, L. Caviglione
This paper identifies key research issues and technologies that we envision will be important to the continued evolution of satellite networking and its integration as a core component of a future Internet that offers reliable, robust and pervasive networking and access to network services.
{"title":"FIRST: Future Internet — a role for satellite technology","authors":"G. Fairhurst, B. Collini-Nocker, L. Caviglione","doi":"10.1109/IWSSC.2008.4656774","DOIUrl":"https://doi.org/10.1109/IWSSC.2008.4656774","url":null,"abstract":"This paper identifies key research issues and technologies that we envision will be important to the continued evolution of satellite networking and its integration as a core component of a future Internet that offers reliable, robust and pervasive networking and access to network services.","PeriodicalId":137382,"journal":{"name":"2008 IEEE International Workshop on Satellite and Space Communications","volume":"91 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":"125154658","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.2008.4656740
E. Matricciani
By applying the Synthetic Storm Technique to the large collection of rain rate time series measured at Spino dpsilaAdda, in 8 years of continuous observation (1993-2000), we have simulated 1120 time series of simultaneous attenuation and phase delay due to rain in a 20deg slant path at 8.4 and 32 GHz. The relationship between phase delay and attenuation exceeded with the same probability is given by a power law, whose exponent is 0.73, likely to be independent of frequency. The results are useful for satellite and deep space tracking.
{"title":"A relationship between phase delay and attenuation due to rain","authors":"E. Matricciani","doi":"10.1109/IWSSC.2008.4656740","DOIUrl":"https://doi.org/10.1109/IWSSC.2008.4656740","url":null,"abstract":"By applying the Synthetic Storm Technique to the large collection of rain rate time series measured at Spino dpsilaAdda, in 8 years of continuous observation (1993-2000), we have simulated 1120 time series of simultaneous attenuation and phase delay due to rain in a 20deg slant path at 8.4 and 32 GHz. The relationship between phase delay and attenuation exceeded with the same probability is given by a power law, whose exponent is 0.73, likely to be independent of frequency. The results are useful for satellite and deep space tracking.","PeriodicalId":137382,"journal":{"name":"2008 IEEE International Workshop on Satellite and Space Communications","volume":"114 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":"133387042","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.2008.4656791
F. Lattanzi, G. Acar, B. Evans
In the last few years, EU and ESA have funded several research programmes to investigate mobility issues related to the extension of the ETSI DVB-RCS standard in order to provide mobile collective vehicles with broadband access. In this paper, we analyse the performance of a lightweight DVB-RCS handover scheme which relies on a history of recent GPS measurements to estimate the terminal residual residence time within the current spot-beam. A geostationary vehicular satellite network is envisaged which is populated by two classes of terminals sharing the same resources: aircrafts and high speed trains. Mobility updates are periodically conveyed via SYNC bursts to the NCC which implements a threshold-based queuing strategy to prioritise handover requests and minimise the number of connections forced to termination. A first-order approximate analytical model of the network is proposed which is used to derive new connection and handover blocking probabilities. Results are validated through an accurate NS-2 modelling of existing DVB-RCS signalling mechanisms. It is emphasised that our handover scheme does not introduce any change to the signalling messages that are already laid out in the DVB-RCS specification.
{"title":"Performance study of a lightweight DVB-RCS handover scheme for vehicular GEO networks","authors":"F. Lattanzi, G. Acar, B. Evans","doi":"10.1109/IWSSC.2008.4656791","DOIUrl":"https://doi.org/10.1109/IWSSC.2008.4656791","url":null,"abstract":"In the last few years, EU and ESA have funded several research programmes to investigate mobility issues related to the extension of the ETSI DVB-RCS standard in order to provide mobile collective vehicles with broadband access. In this paper, we analyse the performance of a lightweight DVB-RCS handover scheme which relies on a history of recent GPS measurements to estimate the terminal residual residence time within the current spot-beam. A geostationary vehicular satellite network is envisaged which is populated by two classes of terminals sharing the same resources: aircrafts and high speed trains. Mobility updates are periodically conveyed via SYNC bursts to the NCC which implements a threshold-based queuing strategy to prioritise handover requests and minimise the number of connections forced to termination. A first-order approximate analytical model of the network is proposed which is used to derive new connection and handover blocking probabilities. Results are validated through an accurate NS-2 modelling of existing DVB-RCS signalling mechanisms. It is emphasised that our handover scheme does not introduce any change to the signalling messages that are already laid out in the DVB-RCS specification.","PeriodicalId":137382,"journal":{"name":"2008 IEEE International Workshop on Satellite and Space Communications","volume":"245 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":"134209710","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.2008.4656766
N. Girault, N. Jegham, N. Lerouge, C. Le Guern, A. Beylot
Different encapsulation schemes are studied and compared for DVB-S2 data transmission.
对不同的DVB-S2数据传输封装方案进行了研究和比较。
{"title":"OURSES: Efficiency of IP encapsulation over DVB-S2 links","authors":"N. Girault, N. Jegham, N. Lerouge, C. Le Guern, A. Beylot","doi":"10.1109/IWSSC.2008.4656766","DOIUrl":"https://doi.org/10.1109/IWSSC.2008.4656766","url":null,"abstract":"Different encapsulation schemes are studied and compared for DVB-S2 data transmission.","PeriodicalId":137382,"journal":{"name":"2008 IEEE International Workshop on Satellite and Space Communications","volume":"128 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":"132806323","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.2008.4656783
L. Liang, H. Cruickshank, Z. Sun, L. Fan, S. Iyengar, M. Mazzella, D. Barvaux
Satellites are expected to play an essential role in bridging the ldquodigital dividerdquo; satellite networks are likely to be the only way to provide broadband services to regions that cannot be economically reached by terrestrial networks, in particular the more remote regions of Europe and the rest of the world. Security can be a problem for such global services. This paper presents a link layer security solution and how it is implemented for the unidirectional lightweight encapsulation (ULE). A satellite testbed is constructed where the ULE security implementation is validated. The experiments results are presented in this paper.
{"title":"ULE security implementation in PLATINE","authors":"L. Liang, H. Cruickshank, Z. Sun, L. Fan, S. Iyengar, M. Mazzella, D. Barvaux","doi":"10.1109/IWSSC.2008.4656783","DOIUrl":"https://doi.org/10.1109/IWSSC.2008.4656783","url":null,"abstract":"Satellites are expected to play an essential role in bridging the ldquodigital dividerdquo; satellite networks are likely to be the only way to provide broadband services to regions that cannot be economically reached by terrestrial networks, in particular the more remote regions of Europe and the rest of the world. Security can be a problem for such global services. This paper presents a link layer security solution and how it is implemented for the unidirectional lightweight encapsulation (ULE). A satellite testbed is constructed where the ULE security implementation is validated. The experiments results are presented in this paper.","PeriodicalId":137382,"journal":{"name":"2008 IEEE International Workshop on Satellite and Space Communications","volume":"11 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":"114175940","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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