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Lightweight Signaling and Efficient Coupling Heuristic for Optical Star Networks MAC Protocols

  • Maurice Gagnaire
Chapter
Part of the IFIP — The International Federation for Information Processing book series (IFIPAICT)

Abstract

Several MAC protocols have been proposed to prevent collisions on passive optical star networks. Time Division Multiple Access (TDMA) is a simple way to guarantee conflict-free concurrent transmissions on such networks. Because it does not require any signaling, TDM efficiency is not distance dependant. However, TDM suffers from non negligible access delays under low load. To reduce this drawback, dynamic allocation schemes (DAS) such as the Random Sheduling Algorithm (RSA) or the Group Time Division Multiplexing (GTDM) have been proposed. Both of these mechanisms reserves slots on a packet-bypacket basis by means of a signaling channel. The capacity in bit/s of this signaling channel is directly related to the number of buffers used in each node. The parallel queueing strategy allows to reduce the signaling cost by using a small number of buffers in each node. In that case, coupling algorithms such as the Minimum-degree Vertex First Scheduling (MVFS) have been proposed to manage the packets enqueueing/dequeueing process. In this paper, we propose a new MAC protocol for passive optical star networks which cumulates the benefits of GTDM in terms of lightweight signaling with those of the MVFS algorithm in terms of coupling efficiency. The performance of this new protocol is compared to other existing solutions by means of computer simulations. We also underline the disruptive influence of propagation delays on the DAS-type protocols efficiency.

Keywords

Single-hop networks passive optical star MAC protocols performance evaluation. 

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Copyright information

© Springer Science+Business Media Dordrecht 1998

Authors and Affiliations

  • Maurice Gagnaire
    • 1
  1. 1.Ecole Nationale Supérieure des TélécommunicationsParis cedex 13France

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