Cross layer techniques for flexible transport protocol using UDP-Lite over a satellite network

Traditional real-time multimedia and streaming services have utilised UDP over RTP. Wireless transmission, by its nature, may introduce a variable, sometimes high bit error ratio. Current transport layer protocols drop all corrupted packets, in contrast, protocols such as UDP-Lite allow error-resilient applications to be supported in the networking stack. This paper presents experimental quantitative performance metrics using H.264 and UDP Lite for the next generation transport of IP multimedia, and discusses the architectural implications for enhancing performance of a wireless and/or satellite environment

Optimisation of multimedia over wireless IP links via X-layer design: an end-to-end transmission chain simulator

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Network layer security: Design for a cross layer architecture

Traditional modular layering schemes have served a major part in the development of a variety of protocols. However, as the physical layer impairments become more unpredictable, a cross layer design (CLD) which is dynamic in nature provides better performance. CLD introduces new challenges in protocol design as well as in the area of security. Using numerical analysis, we show that a link layer design employing header compression and cross layer signalling to protect protocol headers can limit packet discarding. This paper also reviews the IPsec protocol and describes how IPsec can be modified for cross layer architecture. © 2007 IEEE

Rohc-Mpls Tunnel Architecture For Wireless Mesh

Natural or human-made disasters are sudden events that can cause significant damage, especially to the network communication infrastructure. In these events, a rapid deployment of network communication systems is required in order to relay or receive the communication among the people in the disaster areas to conduct relief and rescue efforts. Wireless mesh networks have emerged and has been recognised for its potential for rapid deployment and last mile coverage of network infrastructure, which is highly suitable for emergency response management. While wireless mesh networks have beneficial attributes, it also introduces some crucial problems. During data transmission, the path recovery time is significantly higher resulting in the loss of data if node and link failures occur

DVB-NGH: the Next Generation of Digital Broadcast Services to Handheld Devices

This paper reviews the main technical solutions adopted by the next-generation mobile broadcasting standard DVB-NGH, the handheld evolution of the second-generation digital terrestrial TV standard DVB-T2. The main new technical elements introduced with respect to DVB-T2 are: layered video coding with multiple physical layer pipes, time-frequency slicing, full support of an IP transport layer with a dedicated protocol stack, header compression mechanisms for both IP and MPEG-2 TS packets, new low-density parity check coding rates for the data path (down to 1/5), nonuniform constellations for 64 Quadrature Amplitude Modulation (QAM) and 256QAM, 4-D rotated constellations for Quadrature Phase Shift Keying (QPSK), improved time interleaving in terms of zapping time, end-to-end latency and memory consumption, improved physical layer signaling in terms of robustness, capacity and overhead, a novel distributed multiple input single output transmit diversity scheme for single-frequency networks (SFNs), and efficient provisioning of local content in SFNs. All these technological solutions, together with the high performance of DVB-T2, make DVB-NGH a real next-generation mobile multimedia broadcasting technology. In fact, DVB-NGH can be regarded the first third-generation broadcasting system because it allows for the possibility of using multiple input multiple output antenna schemes to overcome the Shannon limit of single antenna wireless communications. Furthermore, DVB-NGH also allows the deployment of an optional satellite component forming a hybrid terrestrial-satellite network topology to improve the coverage in rural areas where the installation of terrestrial networks could be uneconomical.Gómez Barquero, D.; Douillard, C.; Moss, P.; Mignone, V. (2014). DVB-NGH: the Next Generation of Digital Broadcast Services to Handheld Devices. IEEE Transactions on Broadcasting. 60(2):246-257. doi:10.1109/TBC.2014.2313073S24625760

Towards a GNU/Linux IEEE 802.21 Implementation

Abstract-Multiaccess mobile devices and overlapping wireless network deployments have emerged as a next generation network fixture. To make the most of all available networks, mobile devices should be capable of handing over between heterogeneous networks seamlessly and automatically. At the same time, operators should be able to steer network attachment based on their criteria. Although several cross layer mechanisms have been proposed in recent years, only the Media Independent Handover (MIH) Services framework has advanced in any of the established standardization bodies. This paper presents a blueprint for a GNU/Linux implementation of IEEE 802.21. We review the salient points of the standard, introduce our software implementation architecture, detail information gathering in GNU/Linux, and show how our prototype implementation can be used in practice. In contrast with prior published work, this paper presents a real IEEE 802.21 implementation, not an abstracted or reduced MIH-like framework, tested and empirically evaluated over real heterogeneous networks

Robust MAC-Lite and soft header recovery for packetized multimedia transmission

International audienceThis paper presents an enhanced permeable layer mechanism useful for highly robust packetized multimedia transmission. Packet header recovery at various protocol layers using MAP estimation is the cornerstone of the proposed solution. The inherently available intra-layer and inter-layer header correlation proves to be very effective in selecting a reduced set of possible header configurations for further processing. The best candidate is then obtained through soft decoding of CRC protected data and CRC redundancy information itself. Simulation results for WiFi transmission using DBPSK modulated signals over AWGN channels show a substantial (4 to 12 dB) link budget improvement over classical hard decision procedures. We also introduce a sub-optimal and hardware realizable version of the proposed algorithm

Contributions à la fiabilisation du transport de la vidéo

Les applications vidéo rencontrent un franc succes dans les nouveaux réseaux de communication. Leur utilisation dans des contextes de plus en plus difficiles : réseaux de paquets non fiables (internet), diffusion vers des récepteurs mobiles via des canaux sans fil, ont requis le développement de nouvelles solutions plus efficaces et mieux adaptées. Les travaux de cette thèse sont une tentative de réponse à ces besoins. Les solutions qui ont été développées peuvent être regroupées en deux ensembles : des solutions issues de travaux nouveaux développés dans un contexte d'utilisation ordinaire et des solutions issues de l'amélioration et l'optimisation de travaux existants développés pour des contextes extrêmes.Le canal de Bernoulli a représenté pour nous le cadre de travail pour le développement des nouvelles solutions. Ainsi pour les applications de diffusion vidéo, nous avons ciblé la protection inégale et avons développé un mécanisme à protection inégale des données vidéo (DA-UEP). Ce mécanisme se situe à proximité de la source vidéo et adapte le niveau de protection des données à leur degré d'importance. Son originalité réside dans sa manière d'intégrer la particularité d'interdépendances des données vidéo dans le générateur de la protection inégale. Dans un travail d'approfondissement et d'exploration, nous avons combiné la protection inégale des couches hautes produite par DA-UEP avec de la protection inégale de la couche physique produite par de la modulation hiérarchique. L'optimisation de ce système a permis d'obtenir des gains significatifs et a validé le bien fondé de cette piste de recherche. Pour les communications vidéo interactives, nous avons évalué les performances du mécanisme Tetrys pour les communications vidéo. Ce mécanisme de codage à la volée avec intégration des acquittements a permis d'obtenir des résultats à la hauteur de ceux obtenus par la protection inégale dans un cadre de diffusion. Ces résultats ont aussi permis de mettre en avant tout le potentiel de ce mécanisme. Pour les canaux satellites mobiles, nous nous sommes intéressés à la diffusion vidéo vers des récepteurs mobiles. Dans ce cadre, nous avons évalué des mécanismes tels que les codes correcteurs d'erreurs, les entrelaceurs de la couche physique et de la couche liaison et les codes à effacement de niveau intermédiaire. Nous avons travaillé sur un canal réaliste en prenant en compte les contraintes pratiques telles que les temps de zapping et la vitesse de déplacement des récepteurs. Nous avons révélé les relations qui existent entre vitesse de déplacement, étalement spatial et qualité de réception. Ainsi, nous avons pu mettre en évidence les combinaisons de mécanismes qui permettent d'obtenir les meilleurs résultats en termes de fiabilité et de temps de zapping dans ce contexte particulier. ABSTRACT : Video applications are growing more and more successful in the new communication networks. Their utilization in growing harder context as lossy packet network (Interne), satellitemobile broadcasting wireless channel, call for the developments of more ecient and well adapted solutions. The work done in this thesis is an attempt to answer those new needs. The proposed solutions can be grouped into two sets : solutions based on new works developed for medium context and solutions based on the improvement and optimization of existing works developed for extremes contexts. The Bernoulli channel represented the working environment to develop new solutions. So for video streaming application, we targeted unequal protection mechanisms and developed dependency-aware unequal protection codes (DA-UEP). This mechanism is located near the source application and adapt the protection level to the importance of the data. Its originality comes from its ability to integrate video data dependencies into the protection generator. In a forward work of improvement and exploration, we combined DA-UEP unequal protection from high layers with hierarchical-modulation unequal protection from lower layer. The system optimization achieves substantial gains and validate the righteous of this research area. For conversational video applications, we evaluated the performances of Tetrys in the video communication context. This On-the-y coding mechanism with acknowledgment integration achieves performances as high as those obtained by unequal protection in streaming context. Those performances also advances the high potential of this mechanism. The land mobile satellite channels represented the working environment to improve and optimize existing solutions. We particulary focus on satellite to mobile video broadcasting applications. In this context, we evaluated mechanisms such as forward errors correcting codes (FEC), data interleaving at physical or link layers and forward erasures correcting codes at intermediates layers. The evaluation is made on a realistic satellite channel and takes into account practical constraints such as the maximum zapping time and the user mobility at several speeds. We reveal the existing relations between user velocity, data spreading and reception quality. Consequently, We identied the combinations of mechanisms that give the best performance in terms of reliability and zapping time in this particular framework

3D video transmission over LTE

This thesis presents a research work on quality of experience in 3D video transmission over LTE networks. The objective is to study the state-of-art of LTE and 3D video, described in the scientific literature, and to quantify the user quality of experience (QoE) during a simulated LTE transmission. The work will start by a study of the University of Wien “LTE-A System Simulator” and its capabilities. In addition, different scenarios with various users equipment (UEs) and base stations (eNodeBs) densities will be configured and simulated in order to obtain the frame-by-frame Block Error Rate (BLER) values experienced by different UEs. Once obtained, the Block Error Rate frames will be converted to packet level error traces, which will be used to introduce erasures and corruptions into the packetized 3D video bitstream. The corrupted encoded video stream will be decoded using an error-concealment capable video decoder and the decoded/recovered video quality (QoE) will be estimated based on the Structural Similarity Index of the recovered video. Finally, the QoE results for the different system configurations will allow classifying the severity of the QoE degradations due to transmission losses, through inferring the relationship between those system parameters and the achievable QoE.Esta dissertação apresenta um trabalho de investigação sobre a qualidade de experiência numa transmissão de vídeo 3D sobre redes LTE. O objectivo é estudar o estado-da-arte no que respeita a rede LTE e vídeo 3D, descrito na literatura científica, e obter a qualidade de experiência de usuário (QoE) durante uma simulação de transmissão LTE. O trabalho começará por um estudo do University of Wien “LTE-A System Simulator” e as suas capacidades. Para este efeito, vão ser configurados diferentes cenários com distintas densidades de utilizadores (UEs) e estações base (eNodeBs), com o fim de obter a taxa de erros do bloco (BLER) experimentada por diferentes utilizadores. Depois de obter esta taxa, as tramas da taxa de erros do bloco (BLER) serão convertidas em tramas de nível de erro de pacotes, que vão ser usadas para adicionar corrupções de bit em ficheiros de vídeo 3D. O fluxo de vídeo codificado e corrompido será descodificado usando um descodificador de vídeo e a qualidade do vídeo recuperado vai ser calculada com base no Índice de Similitude Estrutural. Finalmente, os resultados de QoE para as diferentes configurações do sistema permitirão classificar o nível das degradações de QoE devido a perdas de transmissão, por meio de inferir a relação entre os parâmetros do sistema e a QoE obtida.Ingeniería de Telecomunicació

Contributions à la fiabilisation du transport de la vidéo

Les applications vidéo rencontrent un franc succes dans les nouveaux réseaux de communication. Leur utilisation dans des contextes de plus en plus difficiles : réseaux de paquets non fiables (internet), diffusion vers des récepteurs mobiles via des canaux sans fil, ont requis le développement de nouvelles solutions plus efficaces et mieux adaptées. Les travaux de cette thèse sont une tentative de réponse à ces besoins. Les solutions qui ont été développées peuvent être regroupées en deux ensembles : des solutions issues de travaux nouveaux développés dans un contexte d'utilisation ordinaire et des solutions issues de l'amélioration et l'optimisation de travaux existants développés pour des contextes extrêmes.Le canal de Bernoulli a représenté pour nous le cadre de travail pour le développement des nouvelles solutions. Ainsi pour les applications de diffusion vidéo, nous avons ciblé la protection inégale et avons développé un mécanisme à protection inégale des données vidéo (DA-UEP). Ce mécanisme se situe à proximité de la source vidéo et adapte le niveau de protection des données à leur degré d'importance. Son originalité réside dans sa manière d'intégrer la particularité d'interdépendances des données vidéo dans le générateur de la protection inégale. Dans un travail d'approfondissement et d'exploration, nous avons combiné la protection inégale des couches hautes produite par DA-UEP avec de la protection inégale de la couche physique produite par de la modulation hiérarchique. L'optimisation de ce système a permis d'obtenir des gains significatifs et a validé le bien fondé de cette piste de recherche. Pour les communications vidéo interactives, nous avons évalué les performances du mécanisme Tetrys pour les communications vidéo. Ce mécanisme de codage à la volée avec intégration des acquittements a permis d'obtenir des résultats à la hauteur de ceux obtenus par la protection inégale dans un cadre de diffusion. Ces résultats ont aussi permis de mettre en avant tout le potentiel de ce mécanisme.Pour les canaux satellites mobiles, nous nous sommes intéressés à la diffusion vidéo vers des récepteurs mobiles. Dans ce cadre, nous avons évalué des mécanismes tels que les codes correcteurs d'erreurs, les entrelaceurs de la couche physique et de la couche liaison et les codes à effacement de niveau intermédiaire. Nous avons travaillé sur un canal réaliste en prenant en compte les contraintes pratiques telles que les temps de zapping et la vitesse de déplacement des récepteurs. Nous avons révélé les relations qui existent entre vitesse de déplacement, étalement spatial et qualité de réception. Ainsi, nous avons pu mettre en évidence les combinaisons de mécanismes qui permettent d'obtenir les meilleurs résultats en termes de fiabilité et de temps de zapping dans ce contexte particulier.Video applications are growing more and more successful in the new communication networks. Their utilization in growing harder context as lossy packet network (Interne), satellitemobile broadcasting wireless channel, call for the developments of more ecient and well adapted solutions. The work done in this thesis is an attempt to answer those new needs. The proposed solutions can be grouped into two sets : solutions based on new works developed for medium context and solutions based on the improvement and optimization of existing works developed for extremes contexts. The Bernoulli channel represented the working environment to develop new solutions. So for video streaming application, we targeted unequal protection mechanisms and developed dependency-aware unequal protection codes (DA-UEP). This mechanism is located near the source application and adapt the protection level to the importance of the data. Its originality comes from its ability to integrate video data dependencies into the protection generator. In a forward work of improvement and exploration, we combined DA-UEP unequal protection from high layers with hierarchical-modulation unequal protection from lower layer. The system optimization achieves substantial gains and validate the righteous of this research area. For conversational video applications, we evaluated the performances of Tetrys in the video communication context. This On-the-y coding mechanism with acknowledgment integration achieves performances as high as those obtained by unequal protection in streaming context. Those performances also advances the high potential of this mechanism. The land mobile satellite channels represented the working environment to improve and optimize existing solutions. We particulary focus on satellite to mobile video broadcasting applications. In this context, we evaluated mechanisms such as forward errors correcting codes (FEC), data interleaving at physical or link layers and forward erasures correcting codes at intermediates layers. The evaluation is made on a realistic satellite channel and takes into account practical constraints such as the maximum zapping time and the user mobility at several speeds. We reveal the existing relations between user velocity, data spreading and reception quality. Consequently, We identied the combinations of mechanisms that give the best performance in terms of reliability and zapping time in this particular framework.TOULOUSE-INP (315552154) / SudocSudocFranceF