International Telemetering Conference Proceedings / October 30-November 02, 1989 / Town & Country Hotel & Convention Center, San Diego, California / During the current decade, international cooperation in space projects has become more and more popular and this trend is increasing. Initially, this involved only single missions with agencies flying payloads on other agencies' spacecraft. Later, this trend continued with international ventures, involving different agencies. In the immediate future, even more challenging scenarios are foreseen. The best known example and prime driver for such sophisticated missions will be the Space Station Freedom and its participating partners' spacecraft. Some of the international missions (ESA missions) are described briefly in this paper, in order to set the scene for a better understanding of the complex needs for standards within advanced orbiting systems. These ventures call for efficient means for cooperation and interoperability. Part of these requirements can be met by following international standards for space communications and space data systems. The Consultative Committee for Space Data Systems (CCSDS) undertook the task of integrating the space data systems requirements and developing appropriate recommendations for data systems standards for these Advanced Orbiting Systems (AOS). All international partners in the Space Station Freedom Program participated in the definition, development, and review of the AOS recommendations. The need for better cooperation in space communications via data relay satellite prompted the formation of a three party international panel called the Space Network Interoperability Panel (SNIP). An important aspect is the need for verification and validation of the concept and of the detailed technical recommendations. For the immediate future, special compatibility campaigns, involving the international agencies are planned in order to ensure the smooth application and functioning of the AOS recommendations.

Le routage par clé et par contenu sont des systèmes de routage ou la destination d'un message suit un parcours entre les nœuds du réseau qui dépend seulement du contenu du message même. On peut les trouver utilisés soit dans des systèmes pair-à-pair connus comme Réseaux Overlay Structurés (Structured Overlay Networks, SON), soit dans les architecture internet de nouvelle génération, les Réseaux Centrés sur les Contenus (Content-Centric Networks, CCN). Le but de cette thèse est double. D'un côté, on explore le sujet de l'interconnexion et de la coopération des réseaux d'overlay, et on propose une architecture capable de permettre à plusieurs réseaux d'overlay hétérogènes, avec différentes topologies et différents mécanismes de routage, d'interagir, grâce à une infrastructure basée sur des nœuds passerelles. On montre, par des moyennes de simulation et déploiement dans un réseaux réel, que la solution est scalable et permet un routage quasi-exhaustif avec un nombre relativement bas des nœuds passerelle bien connectés. De plus, on présente deux exemples d'applications qui pourront bénéficier de cette architecture. Dans une deuxième partie, on rentre plutôt dans les possibilités offertes par le routage basé sur les contenus hors sa "zone de confort": d'abord, on analyse les améliorations qu'un réseau d'overlay structuré peut porter à un système de diffusion vidéo pair-à-pair, en termes de qualité du vidéo et de perte des paquets pendant la transmission. Après, on examine un système entièrement centré sur le routage basé sur les contenus, en développant une solution de diffusion vidéo en temps réel dans un réseau CCN. / Key-based and content-based routing are a class of routing techniques where the destination and routing path for a message depends solely on the content of the message itself. This kind of routing has been implemented in certain peer-to-peer systems, known as Structured Overlay Networks (SON), or in the Next Generation Internet architectures, under the name of Content-Centric Networks (CCN). The scope of this thesis is twofold: on the one side, we explore the topic of the interconnection and cooperation of different structured overlays, and propose architecture capable of allowing several heterogeneous overlay networks, with different topologies and different routing schemes, to interact, thanks to a lightweight infrastructure consisting of co-located nodes. Through the use of simulations and real-world deployment, we show how this solution is scalable and how it facilitates quasi-exhaustive routing, with even a relatively low number of well-connected co-located nodes. To address the problem of scaling network design to millions of nodes, we propose a mathematical model capable of deriving basic performance figures for an interconnected system. Furthermore, we present two application examples that could greatly benefit from such architecture. On the other side, we investigate a little further into the capabilities of content-based routing outside of its "comfort zone": first, we analyze the improvement that a SON could bring to a peer-to-peer real-time video streaming system (P2P-TV), in terms of chunk loss and Quality of Experience. Then, we move the approach to a fully content-based domain, implementing the P2P-TV solution on top of Content-Centric Networks.

The transformation of the legacy electric grid to Smart Grid (SG) poses numerous challenges in the design and development of an efficient SG communications network. While there has been an increasing interest in identifying the SG communications network and possible SG applications, specific research challenges at the network protocol have not been elaborated yet. This dissertation revisited each layer of a TCP/IP protocol stack which basically was designed for a wired network and optimized their performance in IEEE 802.11s-based Advanced Metering Infrastructure (AMI) communications network against the following challenges: security and privacy, AMI data explosion, periodic simultaneous data reporting scheduling, poor Transport Control Protocol (TCP) performance, Address Resolution Protocol (ARP) broadcast, and network interoperability. To address these challenges, layered and/or cross-layered protocol improvements were proposed for each layer of TCP/IP protocol stack. At the application layer, a tree-based periodic time schedule and a time division multiple access-based scheduling were proposed to reduce high contention when smart meters simultaneously send their reading. Homomorphic encryption performance was investigated to handle AMI data explosion while providing security and privacy. At the transport layer, a tree-based fixed Retransmission Timeout (RTO) setting and a path-error aware RTO that exploits rich information of IEEE 802.11s data-link layer path selection were proposed to address higher delay due to TCP mechanisms. At the network layer, ARP requests create broadcast storm problems in IEEE 802.11s due to the use of MAC addresses for routing. A secure piggybacking-based ARP was proposed to eliminate this issue. The tunneling mechanisms in the LTE network cause a downlink traffic problem to IEEE 802.11s. For the network interoperability, at the network layer of EPC network, a novel UE access list was proposed to address this issue. At the data-link layer, to handle QoS mismatch between IEEE 802.11s and LTE network, Dual Queues approach was proposed for the Enhanced Distributed Channel Access. The effectiveness of all proposed approaches was validated through extensive simulation experiments using a network simulator. The simulation results showed that the proposed approaches outperformed the traditional TCP/IP protocols in terms of end to end delay, packet delivery ratio, throughput, and collection time.