Cédric Baudoin

A mobile ad-hoc satellite and wireless Mesh networking approach for Public Safety communications

It is widely recognized that emergency management and disaster recovery systems are an issue of paramount importance in communities through the world. The definition of a public safety communications infrastructure is a high-priority task due to the lack of interoperability between emergency response departments, the reduced mobility during coordinated operations on a broad scale and the need for access to critical data in real-time. This work proposes an ldquoad-hoc networkingrdquo approach for emergency mobile communications in a satellite and wireless mesh scenario, in which ad hoc and IPv6 mobility mechanisms are combined together. First we analyze mobility management aspects and IP layer protocols and then we focus on proxy mobile IPv6, a network-based mobility management protocol which represents the more suitable micro-mobility solution for the proposed scenario with heterogeneous networks and unmodified mobile terminals.

PLATINE: DVB-S2/RCS Enhanced Testbed for Next Generation Satellite Networks

Emulation is a cost effective and efficient tool to perform performances evaluation and innovative access and network techniques validation. Its ability to interconnect real equipments with real applications provides excellent demonstrations means. The main problem is to overcome the emulation weakness which is the accuracy of the model reproducing the systems to be evaluated. Owing to its modular design and implementation, the PLATINE satellite emulation platform, presented in this paper, is able to emulate a complete DVB-RCS (Digital Video Broadcasting – Return Channel via Satellite)- DVB-S2 (Digital Video Broadcasting – Second ) system in a realistic and flexible way. It is possible to configure the platform to emulate a transparent DVBRCS system dimensioned around a single Hub, or to emulate a system using a regenerative satellite with an on-board switching matrix. Different DVB-RCS protocol stacks are implemented, and the adaptive physical layer is emulated in real time thanks to pre-calculated DRA schemes and MODCOD files. A DiffServ-like QoS Architecture that couples MAC and IP-Layer QoS mechanisms and Layer 2 security framework are currently under development. At the network side, IPv4 and IPv6 are fully supported as well as IPv6 mobility and dynamic multicast. In this paper, we mainly focus on the emulation platform and the tools developed to help the performance analysis of the emulated system.

IP Mobility and Its Impact on Satellite Networking

With the advent of new generation of wireless networks (3G and beyond) and the convergence of network technologies and services around IP, mobility is about to be a common feature integrated in all future networks. In GEO satellite networking, the deployment of Mobile IP raises some important issues that need to be addressed. This paper aims to pinpoint the impact of mobility in a satellite system with other key network features - namely QoS, multicast, and the specific issue of TCP acceleration with PEPs. Some candidate solutions based on the Mobile IP v6 framework and extensions are proposed and analyzed.

Architecture of an IP-based aeronautical network

The International Civil Aviation Organization (ICAO) has defined a mobile IPv6-based Aeronautical Telecommunications Network (ATN/IPS) as a next generation communication network for future Air Traffic Management (ATM). The ATN/IPS will be used with different terrestrial and satellite link technologies for supporting future ATM. In parallel, non-operational services will use different link technologies as well. In such an environment, the main challenge is to design a network architecture that integrates all link technologies in a way that mobile users (be it a cockpit user or a passenger) can make use of them in a seamless way. This paper presents the core functionalities developed within the NEWSKY project of such an integrated IP network architecture.

Overview of Platine emulation testbed and its utilization to support DVB-RCS/S2 evolutions

Designing new satellite access protocols or validating innovative satellite network concepts, evaluating their performances and demonstrating them require powerful test tools to check their compliance with satellite system requirements. Obviously, such tools have to be as representative as possible of typical satellite telecom systems, but also adaptable to specific research and engineering needs. Emulation testbeds provide a cost effective solution for networking activities in complement to traditional simulations tools that are rather suited in satcom research to system dimensioning evaluation. This paper presents the Platine emulation, briefly presents major projects where is has been used, and details its architecture and main features as well as its controller unit. Finally, future perspectives are stressed, for example in the aeronautical communication context.

Combining mobility and heterogeneous networking for emergency management: a PMIPv6 and HIP-based approach

Emergency Management is an important topic for research community worldwide, especially after recent major disasters. The problem of supporting mobility at the disaster site to rescue teams equipped with different heterogeneous access technologies and providing interoperability between different agencies and jurisdictions is still under investigation. In this work we propose to merge the advantages of IPv6 micro-mobility management of Proxy Mobile IPv6 (PMIPv6) with macro-mobility management, security, inter-technology handover and multi-homing features of Host Identity Protocol (HIP). This new approach applied to our proposed ad-hoc satellite and wireless mesh system architecture for emergency mobile communications can improve mobility, security, reliability and interoperability in Emergency Management domain.

Transport Challenges Facing a Next Generation Hybrid Satellite Internet

This paper considers the transport layer implications by assuming a position where satellite networks form one integrated component of a hybrid Internet architecture. It reviews the key role of transport protocols in providing a reliable and robust end-to-end Internet service. A history of TCP protocol evolution from a satellite perspective is followed by focussing on the role of protocol-enhancing proxies in satellite systems and how these have impacted the introduction of new Internet transport techniques. Current transport research issues are identified and related to two new architectural approaches to highlight the expected performance benefits and derive the implications on the design of geostationary satellite Internet systems as the network evolves toward a next-generation Internet. Copyright

Delivery of triple-play services over broadband satellite networks

Digital video broadcast return channel via satellite system (RCS) is a key European standard that specifies a broadband satellite system using dynamic capacity assignment and multi-frequency time-division multiple access. This study introduces new architectural components for an RCS system to support advanced Internet protocol (IP)-oriented multimedia. This will allow closer integration of satellite networks with the next generation of multimedia-enabled networks enabling operators to offer triple-play services that simultaneously support voice over IP, television-over IP and other services. These types of services are particularly suited to next generation satellite systems that combine transparent and multi-spot beam satellites with on-board regenerative signal processing, and can evolve to use adaptive coding and modulation.

A DTN Routing Scheme for Quasi-Deterministic Networks with Application to LEO Satellites Topology

We propose a novel DTN routing algorithm, called DQN, specifically designed for quasi-deterministic networks with an application to satellite constellations. We demonstrate that our proposal efficiently forwards the information over a satellite network derived from the Orbcomm topology while keeping a low replication overhead. We compare our algorithm against other well-known DTN routing schemes and show that we obtain the lowest replication ratio without the knowledge of the topology and with a delivery ratio of the same order of magnitude than a reference theoretical optimal routing.

Protocol Stack Options in Heterogeneous Aeronautical Networks

In the future the amount of air traffic as well as the total data traffic volume of aeronautical communication will significantly increase. A single terrestrial technology alone will likely not be able to manage this challenge but satellite communication systems will serve as complement to direct air to ground data links. The future air traffic management (ATM) will thus consist of highly heterogeneous networks consisting of diverse technologies. It is highly important to design the network protocol stack in a way that allows interoperability of all involved networks while being transparent to the end users and providing the required levels of QoS performance, especially in the presence of transport layer protocols like TCP. This paper presents three different protocol stack alternatives dealing with the mentioned issues, investigates their advantages and disadvantages and proposes a protocol stack fitting the needs of ATM communications.