Pub Date : 2012-10-18DOI: 10.1109/ASMS-SPSC.2012.6333065
J. A. D. Peral-Rosado, J. López-Salcedo, G. Seco-Granados, F. Zanier, M. Crisci
The Long Term Evolution (LTE) is a mobile communication standard that is receiving significant attention, and especially offers positioning capabilities by specifying a dedicated downlink signal, i.e. the positioning reference signal (PRS). Thus, this technology can improve the location of mobile terminals operating in harsh environments, such as urban or indoor scenarios. This paper presents a study of the impact of the channel on the positioning capabilities of LTE with respect to the signal bandwidth. For that purpose, typical channel models, such as those recommended by the International Telecommunication Union (ITU), are used to obtain timing error distributions by means of the histogram of maximum likelihood estimates. The results obtained represent the worst-case scenario since the applied estimation process does not consider the presence of the multipath channel. The dependency of the timing error distributions with respect to the type of channel model is also analysed.
{"title":"Evaluation of the LTE positioning capabilities under typical multipath channels","authors":"J. A. D. Peral-Rosado, J. López-Salcedo, G. Seco-Granados, F. Zanier, M. Crisci","doi":"10.1109/ASMS-SPSC.2012.6333065","DOIUrl":"https://doi.org/10.1109/ASMS-SPSC.2012.6333065","url":null,"abstract":"The Long Term Evolution (LTE) is a mobile communication standard that is receiving significant attention, and especially offers positioning capabilities by specifying a dedicated downlink signal, i.e. the positioning reference signal (PRS). Thus, this technology can improve the location of mobile terminals operating in harsh environments, such as urban or indoor scenarios. This paper presents a study of the impact of the channel on the positioning capabilities of LTE with respect to the signal bandwidth. For that purpose, typical channel models, such as those recommended by the International Telecommunication Union (ITU), are used to obtain timing error distributions by means of the histogram of maximum likelihood estimates. The results obtained represent the worst-case scenario since the applied estimation process does not consider the presence of the multipath channel. The dependency of the timing error distributions with respect to the type of channel model is also analysed.","PeriodicalId":303959,"journal":{"name":"2012 6th Advanced Satellite Multimedia Systems Conference (ASMS) and 12th Signal Processing for Space Communications Workshop (SPSC)","volume":"87 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123026536","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 : 2012-10-18DOI: 10.1109/ASMS-SPSC.2012.6333075
V. Boussemart, L. Marini, M. Berioli
The return-link of a multi-beam satellite system can be regarded as a multiple-input multiple-output (MIMO) system, with users generating interference to each others. If the number of frequencies in the system (or number of colors) gets low (e.g. down to 1, for full frequency reuse), the level of inter-user interference gets higher, but the bandwidth available to each user is increased. Hence it is not straightforward to understand whether the resulting net system capacity is improved by reducing the number of colors. This paper considers this scenario and some state-of-the-art interference-cancellation techniques, together with a novel proposal, to show the impact of the satellite channel on the uncoded Bit Error Rate (BER). The known results from information theory on the optimal ordering for interference cancellation and on scheduling algorithms are exploited to prove the theoretically expected gains: the BER experienced by the worst user can be reduced and the overall system fairness can be increased (i.e. the difference among the BERs experienced by the users is decreased).
{"title":"Multi-beam satellite MIMO systems: BER Analysis of interference cancellation and scheduling","authors":"V. Boussemart, L. Marini, M. Berioli","doi":"10.1109/ASMS-SPSC.2012.6333075","DOIUrl":"https://doi.org/10.1109/ASMS-SPSC.2012.6333075","url":null,"abstract":"The return-link of a multi-beam satellite system can be regarded as a multiple-input multiple-output (MIMO) system, with users generating interference to each others. If the number of frequencies in the system (or number of colors) gets low (e.g. down to 1, for full frequency reuse), the level of inter-user interference gets higher, but the bandwidth available to each user is increased. Hence it is not straightforward to understand whether the resulting net system capacity is improved by reducing the number of colors. This paper considers this scenario and some state-of-the-art interference-cancellation techniques, together with a novel proposal, to show the impact of the satellite channel on the uncoded Bit Error Rate (BER). The known results from information theory on the optimal ordering for interference cancellation and on scheduling algorithms are exploited to prove the theoretically expected gains: the BER experienced by the worst user can be reduced and the overall system fairness can be increased (i.e. the difference among the BERs experienced by the users is decreased).","PeriodicalId":303959,"journal":{"name":"2012 6th Advanced Satellite Multimedia Systems Conference (ASMS) and 12th Signal Processing for Space Communications Workshop (SPSC)","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128104772","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 : 2012-10-18DOI: 10.1109/ASMS-SPSC.2012.6333062
C. Kourogiorgas, A. Panagopoulos, J. Kanellopoulos, Pantelis-Daniel M. Arapoglou
The increasing demand for delivering high data rates in Earth Observation systems using Low Earth Orbit (LEO) satellites has led the migration of operating frequency to Ka band. In this high frequency band rain attenuation is the dominant factor for the degradation of the quality of the link and Fade Mitigation Techniques (FMTs) are necessary in order to implement the links. However, FMTs require the prediction of time series of rain attenuation. In this paper a synthesizer is proposed which will be able to produce rain attenuation time series for LEO slant paths. The input parameters for this model are the elevation angle dependent statistical parameters of rain attenuation (long-term and dynamic) for a given elevation angle. Furthermore, in this paper an accurate methodology is provided to calculate the dynamic input parameter of the induced rain attenuation on the elevation angle-dependent slant path. The geographical coordinates of the sub-satellite points are derived from the AGI's software tool Satellite Tool Kit (STK).
{"title":"Rain attenuation time series synthesizer for LEO satellite systems operating at Ka band","authors":"C. Kourogiorgas, A. Panagopoulos, J. Kanellopoulos, Pantelis-Daniel M. Arapoglou","doi":"10.1109/ASMS-SPSC.2012.6333062","DOIUrl":"https://doi.org/10.1109/ASMS-SPSC.2012.6333062","url":null,"abstract":"The increasing demand for delivering high data rates in Earth Observation systems using Low Earth Orbit (LEO) satellites has led the migration of operating frequency to Ka band. In this high frequency band rain attenuation is the dominant factor for the degradation of the quality of the link and Fade Mitigation Techniques (FMTs) are necessary in order to implement the links. However, FMTs require the prediction of time series of rain attenuation. In this paper a synthesizer is proposed which will be able to produce rain attenuation time series for LEO slant paths. The input parameters for this model are the elevation angle dependent statistical parameters of rain attenuation (long-term and dynamic) for a given elevation angle. Furthermore, in this paper an accurate methodology is provided to calculate the dynamic input parameter of the induced rain attenuation on the elevation angle-dependent slant path. The geographical coordinates of the sub-satellite points are derived from the AGI's software tool Satellite Tool Kit (STK).","PeriodicalId":303959,"journal":{"name":"2012 6th Advanced Satellite Multimedia Systems Conference (ASMS) and 12th Signal Processing for Space Communications Workshop (SPSC)","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125304897","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 : 2012-10-18DOI: 10.1109/ASMS-SPSC.2012.6333072
Valentina Pullano, A. Vanelli-Coralli, G. Corazza
Peak Signal-to-Noise Ratio (PSNR) is the simplest and most widely used objective video quality evaluation method. However, traditional PSNR calculations do not take packet loss into account thus giving an inaccurate representation of the video quality. Indeed, transmission packet losses may be the cause of visible destructive distortions, which can result in a progressive quality degradation due to error propagation effects. This effect is even more visible in the mobile satellite video broadcasting scenario herein addressed. This paper proposes a novel video quality evaluation methodology, based on Y-PSNR (Luminance PSNR). This technique, called Windowed PSNR (WPSNR), allows to handle the packet loss problem and to evaluate the PSNR of the received sequence.
{"title":"PSNR evaluation and alignment recovery for mobile satellite video broadcasting","authors":"Valentina Pullano, A. Vanelli-Coralli, G. Corazza","doi":"10.1109/ASMS-SPSC.2012.6333072","DOIUrl":"https://doi.org/10.1109/ASMS-SPSC.2012.6333072","url":null,"abstract":"Peak Signal-to-Noise Ratio (PSNR) is the simplest and most widely used objective video quality evaluation method. However, traditional PSNR calculations do not take packet loss into account thus giving an inaccurate representation of the video quality. Indeed, transmission packet losses may be the cause of visible destructive distortions, which can result in a progressive quality degradation due to error propagation effects. This effect is even more visible in the mobile satellite video broadcasting scenario herein addressed. This paper proposes a novel video quality evaluation methodology, based on Y-PSNR (Luminance PSNR). This technique, called Windowed PSNR (WPSNR), allows to handle the packet loss problem and to evaluate the PSNR of the received sequence.","PeriodicalId":303959,"journal":{"name":"2012 6th Advanced Satellite Multimedia Systems Conference (ASMS) and 12th Signal Processing for Space Communications Workshop (SPSC)","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121959955","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 : 2012-10-18DOI: 10.1109/ASMS-SPSC.2012.6333103
E. Cianca, M. Sanctis, S. Mukherjee, T. Rossi, C. Stallo, M. Ruggieri, R. Prasad
The paper presents in overview of current RF technology for W-band communications and baseband design, outlining the main challenges and identifying some research trends.
本文概述了当前w波段通信和基带设计的射频技术，概述了主要挑战，并确定了一些研究趋势。
{"title":"Challenges and advances on RF and baseband design for W-band satellite links","authors":"E. Cianca, M. Sanctis, S. Mukherjee, T. Rossi, C. Stallo, M. Ruggieri, R. Prasad","doi":"10.1109/ASMS-SPSC.2012.6333103","DOIUrl":"https://doi.org/10.1109/ASMS-SPSC.2012.6333103","url":null,"abstract":"The paper presents in overview of current RF technology for W-band communications and baseband design, outlining the main challenges and identifying some research trends.","PeriodicalId":303959,"journal":{"name":"2012 6th Advanced Satellite Multimedia Systems Conference (ASMS) and 12th Signal Processing for Space Communications Workshop (SPSC)","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116807518","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 : 2012-10-18DOI: 10.1109/ASMS-SPSC.2012.6333077
G. Cocco, N. Alagha, C. Ibars, S. Cioni
We address several implementation issues related to multi-user physical layer network coding, in which the symbol-synchronous collision of an arbitrary number of signals is decoded. In particular we study the effect of frequency and phase offsets, the imperfect symbol synchronization of the colliding signals and the estimation of frequency and phase offsets and amplitudes in the presence of more than two colliding signals.
{"title":"Practical issues in multi-user physical layer network coding","authors":"G. Cocco, N. Alagha, C. Ibars, S. Cioni","doi":"10.1109/ASMS-SPSC.2012.6333077","DOIUrl":"https://doi.org/10.1109/ASMS-SPSC.2012.6333077","url":null,"abstract":"We address several implementation issues related to multi-user physical layer network coding, in which the symbol-synchronous collision of an arbitrary number of signals is decoded. In particular we study the effect of frequency and phase offsets, the imperfect symbol synchronization of the colliding signals and the estimation of frequency and phase offsets and amplitudes in the presence of more than two colliding signals.","PeriodicalId":303959,"journal":{"name":"2012 6th Advanced Satellite Multimedia Systems Conference (ASMS) and 12th Signal Processing for Space Communications Workshop (SPSC)","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123529139","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 : 2012-10-18DOI: 10.1109/ASMS-SPSC.2012.6333112
C. Caini, Vincenzo Fiore
Although Delay-/Disruption- Tolerant Networking, which originated from research on an Interplanetary Internet, has enlarged its scope to encompass all challenged networks, space applications are still one of its most important application fields. This paper deals with DTN communication from Moon to Earth, based on the use of a lunar satellite acting as a “data-mule” to collect data from a Lander located on the far side of the Moon. To make the scenario more interesting and complex from the point of view of possible security threats, we assume that data must be transferred to a non-institutional user connected to the Space Agency Control Centre via Internet. In particular, the paper investigates the state-of-the-art ability of ION, the NASA implementation of the DTN Bundle Protocol (BP), to cope with the many challenges of the space scenario under investigation, such as intermittent links, low bandwidth, relatively high delays, network partitioning, DTN routing, interoperability between LTP and TCP BP Convergence layers and security threats. To this end, the first part of the paper contains three brief overviews of the DTN architecture, the Bundle Security Protocol and the ION implementation. These facilitate comprehension of the following sections, dedicated to a detailed description of the experiment scenario and, most essentially, to the in depth discussion of the numerical results obtained with the latest ION version (3.0).
{"title":"Moon to earth DTN communications through lunar relay satellites","authors":"C. Caini, Vincenzo Fiore","doi":"10.1109/ASMS-SPSC.2012.6333112","DOIUrl":"https://doi.org/10.1109/ASMS-SPSC.2012.6333112","url":null,"abstract":"Although Delay-/Disruption- Tolerant Networking, which originated from research on an Interplanetary Internet, has enlarged its scope to encompass all challenged networks, space applications are still one of its most important application fields. This paper deals with DTN communication from Moon to Earth, based on the use of a lunar satellite acting as a “data-mule” to collect data from a Lander located on the far side of the Moon. To make the scenario more interesting and complex from the point of view of possible security threats, we assume that data must be transferred to a non-institutional user connected to the Space Agency Control Centre via Internet. In particular, the paper investigates the state-of-the-art ability of ION, the NASA implementation of the DTN Bundle Protocol (BP), to cope with the many challenges of the space scenario under investigation, such as intermittent links, low bandwidth, relatively high delays, network partitioning, DTN routing, interoperability between LTP and TCP BP Convergence layers and security threats. To this end, the first part of the paper contains three brief overviews of the DTN architecture, the Bundle Security Protocol and the ION implementation. These facilitate comprehension of the following sections, dedicated to a detailed description of the experiment scenario and, most essentially, to the in depth discussion of the numerical results obtained with the latest ION version (3.0).","PeriodicalId":303959,"journal":{"name":"2012 6th Advanced Satellite Multimedia Systems Conference (ASMS) and 12th Signal Processing for Space Communications Workshop (SPSC)","volume":"4 1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123268272","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 : 2012-10-18DOI: 10.1109/ASMS-SPSC.2012.6333094
T. Tordjman, O. Lücke
Integrated systems for provision of both operational and non-operational services are investigated in SANDRA (Seamless Aeronautical Networking through integration of Data-Links, Radios and Antennas). This ultimately comprises integration on the network layer which opposes the hardware segregation of operational and non-operational aeronautical domains. Segregation may in this case be achieved by IPsec which introduces significant overhead. This paper investigates the achievable bandwidth savings for future Air Traffic Services and Airline Operational Communications services through RObust Header Compression (ROHC) schemes for IPsec. Further, a ROHC scheme for IPsec with ESP NULL encryption for non-encrypted operational services is discussed.
{"title":"Evaluation of robust header compression for aeronautical operational data","authors":"T. Tordjman, O. Lücke","doi":"10.1109/ASMS-SPSC.2012.6333094","DOIUrl":"https://doi.org/10.1109/ASMS-SPSC.2012.6333094","url":null,"abstract":"Integrated systems for provision of both operational and non-operational services are investigated in SANDRA (Seamless Aeronautical Networking through integration of Data-Links, Radios and Antennas). This ultimately comprises integration on the network layer which opposes the hardware segregation of operational and non-operational aeronautical domains. Segregation may in this case be achieved by IPsec which introduces significant overhead. This paper investigates the achievable bandwidth savings for future Air Traffic Services and Airline Operational Communications services through RObust Header Compression (ROHC) schemes for IPsec. Further, a ROHC scheme for IPsec with ESP NULL encryption for non-encrypted operational services is discussed.","PeriodicalId":303959,"journal":{"name":"2012 6th Advanced Satellite Multimedia Systems Conference (ASMS) and 12th Signal Processing for Space Communications Workshop (SPSC)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133464785","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 : 2012-10-18DOI: 10.1109/ASMS-SPSC.2012.6333081
S. Rosati, G. Corazza, A. Vanelli-Coralli
In this paper we deal with Single Carrier Frequency Division Multiple Access (SC-FDMA) as uplink air interface of broadband satellite networks. Interestingly, SC-FDMA enables a significant increase of the spectral efficiency with respect to the state-of-the-art single-carrier systems. However, as witnessed by the recent specification of the Second Generation DVB Interactive Satellite System (DVB-RCS2) standard [1], in this context, the single-carrier solutions are still preferred to multicarrier ones. This choice is mainly due to the problem of the high vulnerability of multicarrier modulations to the synchronization offsets, phase noise, and, nonlinear distortion effects. In this paper we present a solution to these problems, by proposing a coded SC-FDMA system which including a Joint Multi-User (JMU) Estimation method, and a state-of-the-art Low Density Parity Check (LDPC) coding scheme. Accurate simulations considering, synchronization offsets, phase noise, and, nonlinear distortion effects, show that the present solution can effectively guarantee the quality of service necessary to support new interactive and on-demand services in a satellite scenario.
{"title":"Coded SC-FDMA for broadband satellite return links","authors":"S. Rosati, G. Corazza, A. Vanelli-Coralli","doi":"10.1109/ASMS-SPSC.2012.6333081","DOIUrl":"https://doi.org/10.1109/ASMS-SPSC.2012.6333081","url":null,"abstract":"In this paper we deal with Single Carrier Frequency Division Multiple Access (SC-FDMA) as uplink air interface of broadband satellite networks. Interestingly, SC-FDMA enables a significant increase of the spectral efficiency with respect to the state-of-the-art single-carrier systems. However, as witnessed by the recent specification of the Second Generation DVB Interactive Satellite System (DVB-RCS2) standard [1], in this context, the single-carrier solutions are still preferred to multicarrier ones. This choice is mainly due to the problem of the high vulnerability of multicarrier modulations to the synchronization offsets, phase noise, and, nonlinear distortion effects. In this paper we present a solution to these problems, by proposing a coded SC-FDMA system which including a Joint Multi-User (JMU) Estimation method, and a state-of-the-art Low Density Parity Check (LDPC) coding scheme. Accurate simulations considering, synchronization offsets, phase noise, and, nonlinear distortion effects, show that the present solution can effectively guarantee the quality of service necessary to support new interactive and on-demand services in a satellite scenario.","PeriodicalId":303959,"journal":{"name":"2012 6th Advanced Satellite Multimedia Systems Conference (ASMS) and 12th Signal Processing for Space Communications Workshop (SPSC)","volume":"90 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116649104","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 : 2012-10-18DOI: 10.1109/ASMS-SPSC.2012.6333074
F. Vieira, D. Lucani, N. Alagha
Driven by the increasing demand of Internet anywhere and anytime, mobile broadband services are set to represent an important share of the satellite traffic due to the availability advantages of satellite networks. These services require a robust and flexible mobility support mechanism, which includes efficient soft-handovers between beams. The latter poses important practical challenges at a physical and network level in order to provide two simultaneous connections to a mobile terminal via two different beams. From a network perspective, typical soft-handover algorithms require the system to transmit repetitions of the packets over both connections. Our approach breaks with this concept by considering soft-handovers as a resource allocation problem driven by the uncertainty of terminal mobility and the time-varying nature of loads in a multibeam satellite system. We propose a set of techniques and algorithms that provide load-aware soft-handovers for multibeam satellites that exploit the ability of advanced terminals to receive and process several overlapping beams. To provide a flexible resource allocation mechanism that exploits multiple routes, we rely on packet-level coding techniques, such as network coding, in order to increase robustness and relax the allocation problem. An advantageous collateral effect of our algorithms is the provision of load balancing between beams in satellites with conventional payloads. We provide simulation results for the case of a multi-beam satellite covering Europe with 70 beams serving fixed and mobile terminals that illustrate that our techniques can increase overall throughput by (i) reducing the resources allocated to each terminal for roaming support when compared to state-of-the-art soft-handover mechanisms, and (ii) spreading the load to beams with light traffic requirements.
{"title":"Load-aware soft-handovers for multibeam satellites: A network coding perspective","authors":"F. Vieira, D. Lucani, N. Alagha","doi":"10.1109/ASMS-SPSC.2012.6333074","DOIUrl":"https://doi.org/10.1109/ASMS-SPSC.2012.6333074","url":null,"abstract":"Driven by the increasing demand of Internet anywhere and anytime, mobile broadband services are set to represent an important share of the satellite traffic due to the availability advantages of satellite networks. These services require a robust and flexible mobility support mechanism, which includes efficient soft-handovers between beams. The latter poses important practical challenges at a physical and network level in order to provide two simultaneous connections to a mobile terminal via two different beams. From a network perspective, typical soft-handover algorithms require the system to transmit repetitions of the packets over both connections. Our approach breaks with this concept by considering soft-handovers as a resource allocation problem driven by the uncertainty of terminal mobility and the time-varying nature of loads in a multibeam satellite system. We propose a set of techniques and algorithms that provide load-aware soft-handovers for multibeam satellites that exploit the ability of advanced terminals to receive and process several overlapping beams. To provide a flexible resource allocation mechanism that exploits multiple routes, we rely on packet-level coding techniques, such as network coding, in order to increase robustness and relax the allocation problem. An advantageous collateral effect of our algorithms is the provision of load balancing between beams in satellites with conventional payloads. We provide simulation results for the case of a multi-beam satellite covering Europe with 70 beams serving fixed and mobile terminals that illustrate that our techniques can increase overall throughput by (i) reducing the resources allocated to each terminal for roaming support when compared to state-of-the-art soft-handover mechanisms, and (ii) spreading the load to beams with light traffic requirements.","PeriodicalId":303959,"journal":{"name":"2012 6th Advanced Satellite Multimedia Systems Conference (ASMS) and 12th Signal Processing for Space Communications Workshop (SPSC)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131039633","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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