The first version of QUIC has recently been standardized by the IETF. The framework of QUIC enabl... more The first version of QUIC has recently been standardized by the IETF. The framework of QUIC enables the proposition, negociation and exploitation of extensions to adapt some of its mechanisms. As one example, the DATAGRAM extension enables the unreliable transmission of data. The BDP FRAME extension is a method that can improve traffic delivery by allowing a QUIC connection to remember the knowledge of path characteristics and exploit them when resuming a session. This technical report presents the rationale behind fast convergence in SATCOM systems and evaluate the BDP FRAME extension in emulated and live environments.
HAL is a multi-disciplinary open access archive for the deposit and dissemination of scientific r... more HAL is a multi-disciplinary open access archive for the deposit and dissemination of scientific research documents, whether they are published or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers. L’archive ouverte pluridisciplinaire HAL, est destinée au dépôt et à la diffusion de documents scientifiques de niveau recherche, publiés ou non, émanant des établissements d’enseignement et de recherche français ou étrangers, des laboratoires publics ou privés. R T CNES “ Virtualisation des composants sol THD ” Tâche 2 Pascal Berthou, Tanissia Djemai, Samir Medjiah, David Pradas, Fabrice Arnal
HAL is a multi-disciplinary open access archive for the deposit and dissemination of scientific r... more HAL is a multi-disciplinary open access archive for the deposit and dissemination of scientific research documents, whether they are published or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers. L’archive ouverte pluridisciplinaire HAL, est destinée au dépôt et à la diffusion de documents scientifiques de niveau recherche, publiés ou non, émanant des établissements d’enseignement et de recherche français ou étrangers, des laboratoires publics ou privés. R T CNES “ Virtualisation des composants sol THD ” Apport des solutions de virtualisation pour les systèmes satcom vHTS Pascal Berthou, Tanissia Djemai, Samir Medjiah, David Pradas, Fabrice Arnal
ABSTRACT Internet services can be efficiently provided in rural areas using hybrid architectures ... more ABSTRACT Internet services can be efficiently provided in rural areas using hybrid architectures for the access network. Our proposal relies on WiMAX technology for last mile access and satellite backhauling for Internet connectivity. The satellite link uses ETSI standardized air interface: DVB-S2 on the forward link, DVB-RCS on the return link. The application scenario is dedicated to communications in the Amazonian region where many villages are scattered along the Amazon river. The satellite uses Ku or Ka band frequencies. The paper addresses the design problems raised by this difficult propagation/topographical environment. As deep fades can be experienced, Fade Mitigation Techniques are activated. We describe the way physical and access layers are impacted by FMTs. Then cross-layer mechanisms are introduced to adapt network upper layers behavior to the capacity changes on the satellite link. The control load mechanisms are illustrated on the basis of the VoIP service. VoIP codec rate on user side is controlled by the Network Control Center in order to match the satellite link capacity drops due to physical layer adaptation to channel conditions. Realistic modeling is considered for both the hybrid architecture and the satellite channel.
Abstract—Unequal protection mechanisms have been proposed at several layers in order to improve t... more Abstract—Unequal protection mechanisms have been proposed at several layers in order to improve the reliability of multimedia contents, especially for video data. The paper aims at implementing a multi-layer unequal protection scheme, which is based on a Physical-Transport-Application cross-layer design. Hierarchical Modulation, in the physical layer, has been demonstrated to increase the overall user capacity of a wireless communications. On the other hand, unequal erasure protection codes at the transport layer turned out to be an efficient method to protect video data generated by the application layer by exploiting their intrinsic properties. In this paper, the two techniques are jointly optimized in order to enable recovering lost data in case the protection is performed separately. We show that the cross-layer design proposed herein outperforms the performance of hierarchical modulation and unequal erasure codes taken independently. Index Terms—Unequal erasure protection (UEP)...
Mobility management is a desired feature for the emerging Internet of Things (IoT). Mobility awar... more Mobility management is a desired feature for the emerging Internet of Things (IoT). Mobility aware solutions increase the connectivity and enhance adaptability to changes of the location and infrastructure. IoT is enabling a new generation of dynamic ecosystems in environments such as smart cities and hospitals. Dynamic ecosystems require ubiquitous access to Internet, seamless handover, flexible roaming policies, and an interoperable mobility protocol with existing Internet infrastructure. These features are challenges for IoT devices, which are usually constrained devices with low memory, processing, communication and energy capabilities. This work presents an analysis of the requirements and desirable features for the mobility support in the IoT, and proposes an efficient solution for constrained environments based on Mobile IPv6 and IPSec. Compatibility with IPv6-existing protocols has been considered a major requirement in order to offer scalable and inter-domain solutions that...
The new standard for Digital Video Broadcasting for satellite applications (DVB-S2) optimizes the... more The new standard for Digital Video Broadcasting for satellite applications (DVB-S2) optimizes the performance and the flexibility of the transmis-sion. It improves the capacity gain in about 30% over DVB-S. This gain is mostly thanks to the introduction of an adaptive physical ...
This paper presents a study of the cross-layer optimisation of real time traffic transmission ove... more This paper presents a study of the cross-layer optimisation of real time traffic transmission over satellite systems implementing DVB-S2/RCS. In particular, we focus on voice over IP (VoIP) transmission and we aim at reducing total transmission delay and jitter. We propose an end-user-centric scenario where codec rate adaptation is performed. Two possible cross-layer codec rate adaptations have been analyzed. First, we propose a bank of codecs be available at both transmission ends and a codec switch is performed driven by the RTCP (real time control protocol) reports. In this case a transport-to-application layer cross-layer information flow is required. Second, we propose the use of adaptive wideband codecs (inherently cross-layer across the network). Realistic modelling is considered for both the system and (Ka band) channel. We present an analysis of the two proposed cross-layer mechanism showing the potentiality of both approaches even in long-delay scenarios such as a GEO satellite system.
Hybrid architectures including satellites are of undoubted interest for wireless networks deploym... more Hybrid architectures including satellites are of undoubted interest for wireless networks deployment in rural and remote areas. We focus on VoIP capacity service optimization over a hybrid network and we compare performance under temperate and tropical propagation conditions. We have chosen a (GEO) satellite and wireless network combination, based on DVB-S2/RCS and WiMAX standards. This combination has already proven to
This paper presents a study of the cross-layer optimisation of real time traffic transmission ove... more This paper presents a study of the cross-layer optimisation of real time traffic transmission over hybrid networks. In particular, we focus on DVB-RCS/S2 satellite and WiMAX. We focus on Voice over IP (VoIP) transmission and we aim at reducing total transmission delay and jitter. We propose an enduser-centric scenario where codec rate adaptation is performed. Two possible cross-layer codec rate adaptations have been analyzed. First, we propose a bank of codec is available at both transmission ends and a codec switch is performed driven by the RTCP (Real Time Control Protocol) reports. In this case a transport-to-application layer cross-layer information flow is required. Second, we propose the use of adaptive wideband codecs (inherently cross-layer across the networks). Realistic modelling is considered for both the terrestrial and satellite (Ka band) channel. We present a preliminary analysis of the two proposed cross-layer mechanisms and we demonstrate that by reducing total transmission delay and jitter through cross-layer design, total capacity increases significantly. Our results thus show the great potentiality of cross-layer design even in a long-delay scenario such as a GEO satellite system.
DVB-SH has been demonstrated to provide an efficient way of carrying multimedia services over hyb... more DVB-SH has been demonstrated to provide an efficient way of carrying multimedia services over hybrid satellite and terrestrial networks for a big diversity of terminals. Moreover, a variety of possible hybrid system architectures can be chosen due to the two different physical layers specified: ODFM and TDM. Although DVB-SH has been designed for broadcast transmission, we propose to use it for multicast applications, which is more competitive over satellite systems. New system techniques implemented in the hybrid scheme, such as ACM and resource allocation, make the system strongly dependent on the channel conditions. Thus the capacity optimization in a multicast scenario becomes a powerful research challenge, mainly in mobile scenarios. In this paper, we aim at optimizing the multicast transmission over the satellite link and the terrestrial link of a DVB-SH based system. The architecture proposed includes resource allocation techniques adapted according to cross-layer information, and depending on the scenarios considered (users mobility and transmission mode). We first investigate a Hierarchical Allocation algorithm based on SC (HA-SC) for the OFDM air interface of DVB-SH, which is constrained to serve a minimum rate to all users. We later propose a Time Scheduling (TS) algorithm, more appropriate for TDM satellite-based systems, which finds the optimal number of users to be served in order to achieve the highest throughput in the multicast group. We show that TS algorithm performs successfully compared to the worst case user (broadcast). On the other hand, HA-SC is more suitable for the satellite since it outperforms TS.
The first version of QUIC has recently been standardized by the IETF. The framework of QUIC enabl... more The first version of QUIC has recently been standardized by the IETF. The framework of QUIC enables the proposition, negociation and exploitation of extensions to adapt some of its mechanisms. As one example, the DATAGRAM extension enables the unreliable transmission of data. The BDP FRAME extension is a method that can improve traffic delivery by allowing a QUIC connection to remember the knowledge of path characteristics and exploit them when resuming a session. This technical report presents the rationale behind fast convergence in SATCOM systems and evaluate the BDP FRAME extension in emulated and live environments.
HAL is a multi-disciplinary open access archive for the deposit and dissemination of scientific r... more HAL is a multi-disciplinary open access archive for the deposit and dissemination of scientific research documents, whether they are published or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers. L’archive ouverte pluridisciplinaire HAL, est destinée au dépôt et à la diffusion de documents scientifiques de niveau recherche, publiés ou non, émanant des établissements d’enseignement et de recherche français ou étrangers, des laboratoires publics ou privés. R T CNES “ Virtualisation des composants sol THD ” Tâche 2 Pascal Berthou, Tanissia Djemai, Samir Medjiah, David Pradas, Fabrice Arnal
HAL is a multi-disciplinary open access archive for the deposit and dissemination of scientific r... more HAL is a multi-disciplinary open access archive for the deposit and dissemination of scientific research documents, whether they are published or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers. L’archive ouverte pluridisciplinaire HAL, est destinée au dépôt et à la diffusion de documents scientifiques de niveau recherche, publiés ou non, émanant des établissements d’enseignement et de recherche français ou étrangers, des laboratoires publics ou privés. R T CNES “ Virtualisation des composants sol THD ” Apport des solutions de virtualisation pour les systèmes satcom vHTS Pascal Berthou, Tanissia Djemai, Samir Medjiah, David Pradas, Fabrice Arnal
ABSTRACT Internet services can be efficiently provided in rural areas using hybrid architectures ... more ABSTRACT Internet services can be efficiently provided in rural areas using hybrid architectures for the access network. Our proposal relies on WiMAX technology for last mile access and satellite backhauling for Internet connectivity. The satellite link uses ETSI standardized air interface: DVB-S2 on the forward link, DVB-RCS on the return link. The application scenario is dedicated to communications in the Amazonian region where many villages are scattered along the Amazon river. The satellite uses Ku or Ka band frequencies. The paper addresses the design problems raised by this difficult propagation/topographical environment. As deep fades can be experienced, Fade Mitigation Techniques are activated. We describe the way physical and access layers are impacted by FMTs. Then cross-layer mechanisms are introduced to adapt network upper layers behavior to the capacity changes on the satellite link. The control load mechanisms are illustrated on the basis of the VoIP service. VoIP codec rate on user side is controlled by the Network Control Center in order to match the satellite link capacity drops due to physical layer adaptation to channel conditions. Realistic modeling is considered for both the hybrid architecture and the satellite channel.
Abstract—Unequal protection mechanisms have been proposed at several layers in order to improve t... more Abstract—Unequal protection mechanisms have been proposed at several layers in order to improve the reliability of multimedia contents, especially for video data. The paper aims at implementing a multi-layer unequal protection scheme, which is based on a Physical-Transport-Application cross-layer design. Hierarchical Modulation, in the physical layer, has been demonstrated to increase the overall user capacity of a wireless communications. On the other hand, unequal erasure protection codes at the transport layer turned out to be an efficient method to protect video data generated by the application layer by exploiting their intrinsic properties. In this paper, the two techniques are jointly optimized in order to enable recovering lost data in case the protection is performed separately. We show that the cross-layer design proposed herein outperforms the performance of hierarchical modulation and unequal erasure codes taken independently. Index Terms—Unequal erasure protection (UEP)...
Mobility management is a desired feature for the emerging Internet of Things (IoT). Mobility awar... more Mobility management is a desired feature for the emerging Internet of Things (IoT). Mobility aware solutions increase the connectivity and enhance adaptability to changes of the location and infrastructure. IoT is enabling a new generation of dynamic ecosystems in environments such as smart cities and hospitals. Dynamic ecosystems require ubiquitous access to Internet, seamless handover, flexible roaming policies, and an interoperable mobility protocol with existing Internet infrastructure. These features are challenges for IoT devices, which are usually constrained devices with low memory, processing, communication and energy capabilities. This work presents an analysis of the requirements and desirable features for the mobility support in the IoT, and proposes an efficient solution for constrained environments based on Mobile IPv6 and IPSec. Compatibility with IPv6-existing protocols has been considered a major requirement in order to offer scalable and inter-domain solutions that...
The new standard for Digital Video Broadcasting for satellite applications (DVB-S2) optimizes the... more The new standard for Digital Video Broadcasting for satellite applications (DVB-S2) optimizes the performance and the flexibility of the transmis-sion. It improves the capacity gain in about 30% over DVB-S. This gain is mostly thanks to the introduction of an adaptive physical ...
This paper presents a study of the cross-layer optimisation of real time traffic transmission ove... more This paper presents a study of the cross-layer optimisation of real time traffic transmission over satellite systems implementing DVB-S2/RCS. In particular, we focus on voice over IP (VoIP) transmission and we aim at reducing total transmission delay and jitter. We propose an end-user-centric scenario where codec rate adaptation is performed. Two possible cross-layer codec rate adaptations have been analyzed. First, we propose a bank of codecs be available at both transmission ends and a codec switch is performed driven by the RTCP (real time control protocol) reports. In this case a transport-to-application layer cross-layer information flow is required. Second, we propose the use of adaptive wideband codecs (inherently cross-layer across the network). Realistic modelling is considered for both the system and (Ka band) channel. We present an analysis of the two proposed cross-layer mechanism showing the potentiality of both approaches even in long-delay scenarios such as a GEO satellite system.
Hybrid architectures including satellites are of undoubted interest for wireless networks deploym... more Hybrid architectures including satellites are of undoubted interest for wireless networks deployment in rural and remote areas. We focus on VoIP capacity service optimization over a hybrid network and we compare performance under temperate and tropical propagation conditions. We have chosen a (GEO) satellite and wireless network combination, based on DVB-S2/RCS and WiMAX standards. This combination has already proven to
This paper presents a study of the cross-layer optimisation of real time traffic transmission ove... more This paper presents a study of the cross-layer optimisation of real time traffic transmission over hybrid networks. In particular, we focus on DVB-RCS/S2 satellite and WiMAX. We focus on Voice over IP (VoIP) transmission and we aim at reducing total transmission delay and jitter. We propose an enduser-centric scenario where codec rate adaptation is performed. Two possible cross-layer codec rate adaptations have been analyzed. First, we propose a bank of codec is available at both transmission ends and a codec switch is performed driven by the RTCP (Real Time Control Protocol) reports. In this case a transport-to-application layer cross-layer information flow is required. Second, we propose the use of adaptive wideband codecs (inherently cross-layer across the networks). Realistic modelling is considered for both the terrestrial and satellite (Ka band) channel. We present a preliminary analysis of the two proposed cross-layer mechanisms and we demonstrate that by reducing total transmission delay and jitter through cross-layer design, total capacity increases significantly. Our results thus show the great potentiality of cross-layer design even in a long-delay scenario such as a GEO satellite system.
DVB-SH has been demonstrated to provide an efficient way of carrying multimedia services over hyb... more DVB-SH has been demonstrated to provide an efficient way of carrying multimedia services over hybrid satellite and terrestrial networks for a big diversity of terminals. Moreover, a variety of possible hybrid system architectures can be chosen due to the two different physical layers specified: ODFM and TDM. Although DVB-SH has been designed for broadcast transmission, we propose to use it for multicast applications, which is more competitive over satellite systems. New system techniques implemented in the hybrid scheme, such as ACM and resource allocation, make the system strongly dependent on the channel conditions. Thus the capacity optimization in a multicast scenario becomes a powerful research challenge, mainly in mobile scenarios. In this paper, we aim at optimizing the multicast transmission over the satellite link and the terrestrial link of a DVB-SH based system. The architecture proposed includes resource allocation techniques adapted according to cross-layer information, and depending on the scenarios considered (users mobility and transmission mode). We first investigate a Hierarchical Allocation algorithm based on SC (HA-SC) for the OFDM air interface of DVB-SH, which is constrained to serve a minimum rate to all users. We later propose a Time Scheduling (TS) algorithm, more appropriate for TDM satellite-based systems, which finds the optimal number of users to be served in order to achieve the highest throughput in the multicast group. We show that TS algorithm performs successfully compared to the worst case user (broadcast). On the other hand, HA-SC is more suitable for the satellite since it outperforms TS.
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Papers by David Pradas