Cross-layer reliability management for multicast over satellite
Section snippets
Introduction and problem statement
Geostationary satellites have demonstrated their ability to support audio and video broadcasting services by transmitting information on a single carrier to many receivers dispersed over large areas illuminated by the satellite transmit antenna. Available bandwidth at Ka band and the now well established DVB-RCS standard will foster the development of satellite based services aiming at distribution of data. In particular, satellites will play an important role for IP multicast applications
Conventional reliability management in IP multicast over DVB-S
Fig. 1 displays the network configuration considered for multicast over satellite. The data contents generated by the source server are forwarded by a terrestrial IP network to the gateway, where IP datagrams are encapsulated in a DVB-S compliant data stream. The gateway uplinks this to the satellite which broadcasts the carrier to all receiving VSATs within its downlink coverage. IP routers are connected to the VSAT and participate in the delivery of multicast data to the end user terminals
Cross-layer reliability management for partially reliable multicast satellite service
In satellite systems errors frequently originate in propagation impairments, especially at the Ka band. Subsequently, with conventional reliability management, a single uncorrected bit-error may lead to the loss of the entire packet for the considered receiver, and the retransmission of the lost packet may delay information transfer to all receivers involved in the multicast session. This is of importance especially for long packets. This argues in favour of a change in the protocol
A type II Hybrid-ARQ transport protocol for fully reliable multicast satellite service
This section introduces fully reliable multicast in reliability management over satellite links. Our goal in the protocol design is to make the best use of data packets forwarded to the destination transport layer level. We propose to do this by means of the following processes at transport layer level: (1) using a hybrid ARQ scheme, (2) interleaving transmitted data, (3) decoding data with an appropriate error and erasure decoding algorithm, (4) selecting the appropriate granularity for
Performance evaluation
Performance is evaluated according to the number of packets transmitted, and to the number of retransmission cycles that have occurred to achieve a successful decoding of a FEC block which are those parameters chosen in [24]. These evaluations have required, due to the high complexity of implementation in a real environment, a simulation approach. Simulations have been performed thanks to the coding functions library from IT++ freeware [23], over a classical AWGN channel. Several assumptions
Concluding remarks and future work
In this paper, we have shown that the reliability management in multicast satellite service could be ensured by means of a specific protocol architecture. This proposed protocol architecture consists of a modified version of those that have been elaborated for use in terrestrial networks, incorporating specific coding and ARQ procedures along with cross-layering. The MPHP mechanism presented in this paper combined with the adaptation of the MPE layer can ensure, for a given noisy channel, an
Fabrice Arnal received his post graduate degree (DEA) in Computer Networks and Telecommunications from the Ecole Nationale Supérieure des Télécommunications (ENST) in Toulouse, France, in 2001. He is currently a Ph.D. candidate in Computer Science, at the cooperative Laboratory in Telecommunications for Space and Aeronautics (TéSA) in Toulouse with ENST. Its researches involve multicast communications over satellite and his work is funded by Alcatel Space.
References (24)
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- ISO/IEC 13818-1: Information Technology—Generic coding of moving pictures and associated audio: Systems, ISO/IEC,...
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Fabrice Arnal received his post graduate degree (DEA) in Computer Networks and Telecommunications from the Ecole Nationale Supérieure des Télécommunications (ENST) in Toulouse, France, in 2001. He is currently a Ph.D. candidate in Computer Science, at the cooperative Laboratory in Telecommunications for Space and Aeronautics (TéSA) in Toulouse with ENST. Its researches involve multicast communications over satellite and his work is funded by Alcatel Space.
Laurent Dairaine is currently associate Professor at “Ecole Nationale Supérieure d’Ingénieurs de Constructions Aéronautiques” (ENSICA) in Toulouse, France (http://www.ensica.fr). He received a Ph.D. in computer science from Pierre et Marie Curie University of Paris in 1994 (LIP6 Laboratory). In 1994 and 1995, he spent a year as visiting researcher at University of technology, Sydney (UTS), Australia. His research interests concerns quality of service and end-to-end communication architectures. He recently worked on application and transport protocols for IP Multicast over satellite and quality of service support over peer to peer and replication systems.
Jérôme Lacan received his M.E. and Ph.D. degrees in Computer Science from University Paul Sabatier, Toulouse, France in 1994 and 1997. In 1996–2000, he was assistant professor in University of Franche-Comté, France in Computer Science. Since 2001, he is with the Department of Applied Mathematics and Information Technology of the ENSICA and with the Cooperative Laboratory in Telecommunications for Space and Aeronautics (TéSA) in Toulouse, France. His research interests are coding theory and network protocols.
Gérard Maral is a well-known international expert and lecturer on various aspects of satellite communications. He graduated from the Ecole Centrale des Arts et Manufactures (Paris) in 1965, and received his Doctorat d’Etat from the French University in 1970. He was then appointed as a Professor of the University of Toulouse (France). He joined the Ecole Nationale Supérieure des Télécommunications (ENST) in 1984 and subsequently developed the site of Toulouse of ENST and its related Satellite Communications Systems Educational and Research Programme. He is the author of several texbooks on satellite communications: including Satellite Communications Systems (Wiley, fourth edition 2002), VSAT Networks (Wiley, 1995).