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Adaptativité de charges utiles pour satellites multifaisceaux par reconfiguration de couverture

Adaptive multibeam satellite payload by means of coverage reconfiguration

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Abstract

This paper presents a set of algorithms aiming at the reconfiguration of a multibeam satellite coverage by control of the beam forming networks. Two kinds of algorithm are studied : one for the satellite gain management and the other for channels to beam allocation. The reconfigurable system is compared to a fixed coverage one using a switching matrix for the allocation of satellite channels to beams. It is shown that for short time communications (typically 100 ms) the reconfigurable system, offers, with the same antenna size, a dramatic increase in terms of the number of potential customers while maintaining a service quality comparable to that offered by the fixed coverage system using a switching matrix for the allocation of satellite channels to beams. The service quality is described here by two parameters : waiting time and blocking probability. However for communications with longer duration (typically several minutes) the degradation is unbearable.

Résumé

Cet article présente un ensemble ď algorithmes utilisables pour la reconfiguration de couverture ďun satellite multifaisceaux par commande des formateurs de faisceaux de ľantenne. Deux types ďalgorithme sont présentés : le premier gère la ressource gain de manière à garantir la qualité minimale requise sur la liaison, le second permet ďaffecter à la demande la capacité de traitement embarquée c’ est-à-dire les canaux de communication du satellite. Le système à reconfiguration de couverture (formateurs de faisceaux variables) est comparé à un systéme à couverture non reconfigurable (formateurs de faisceaux fixes) mais disposant ďune matrice de réaffectation des canaux entre les faisceaux. Il est montré, dans le contexte ďun service à courte durée de communication (100 ms), que le systéme à reconfiguration de couverture permet de desservir un nombre ďusagers beaucoup plus important que le systéme à formateurs de faisceaux fixes utilisant une matrice de réaffectation des canaux entre les faisceaux tout en offrant une qualité de service équivalente, en terme de temps ď attente pour ľallocation de ressource, ou de probabilité de blocage. Par contre pour des services è durée de communication plus élevée (quelques minutes) la dégradation de la qualité de service est excessive.

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Authors and Affiliations

  1. Télvcom Paris, site de Toulouse, BP 4004, F-31028, Toulouse Cedex, France

    Jean-Pierre Cances & Gérard Maral

  2. Alcatel Espace Toulouse, 28, avenue J.-F. Champollion, BP 1187, F-31037, Toulouse Cedex, France

    Bernard Coulomb & Régis Lenormand

Authors
  1. Jean-Pierre Cances
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  2. Gérard Maral
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  3. Bernard Coulomb
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  4. Régis Lenormand
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Cances, JP., Maral, G., Coulomb, B. et al. Adaptativité de charges utiles pour satellites multifaisceaux par reconfiguration de couverture. Ann. Télécommun. 48, 513–529 (1993). https://doi.org/10.1007/BF02995479

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  • DOI: https://doi.org/10.1007/BF02995479

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