3rd International ICST Conference on Broadband Communications, Networks, and Systems

Research Article

Relaxing Delayed Reservations: An approach for Quality of Service differentiation in Optical Burst Switching networks

  • @INPROCEEDINGS{10.1109/BROADNETS.2006.4374364,
        author={Kostas Christodoulopoulos and Kyriakos Vlachos and Kostas Yiannopoulos and Emmanuel A.  Varvarigos},
        title={Relaxing Delayed Reservations: An approach for Quality of Service differentiation in Optical Burst Switching networks},
        proceedings={3rd International ICST Conference on Broadband Communications, Networks, and Systems},
        publisher={IEEE},
        proceedings_a={BROADNETS},
        year={2006},
        month={10},
        keywords={},
        doi={10.1109/BROADNETS.2006.4374364}
    }
    
  • Kostas Christodoulopoulos
    Kyriakos Vlachos
    Kostas Yiannopoulos
    Emmanuel A. Varvarigos
    Year: 2006
    Relaxing Delayed Reservations: An approach for Quality of Service differentiation in Optical Burst Switching networks
    BROADNETS
    IEEE
    DOI: 10.1109/BROADNETS.2006.4374364
Kostas Christodoulopoulos1, Kyriakos Vlachos1,*, Kostas Yiannopoulos1, Emmanuel A. Varvarigos1
  • 1: Computer Engineering and Informatics Dept. (CEID) and Research Academic Computer Technology Institute (RACTI), University of Patras, GR26500, Rio
*Contact email: kvlachos@ceid.upatras.gr

Abstract

In this paper we present a signaling protocol for QoS differentiation suitable for optical burst switching networks. The proposed protocol is a two-way reservation scheme that employs delayed and in-advance reservation of resources. In this scheme delayed reservations may be relaxed, introducing a reservation duration parameter that is negotiated during call setup phase. This feature allows bursts to reserve resources beyond their actual size to increase their successful forwarding probability and is used to provide QoS differentiation. The proposed signaling protocol offers a low blocking probability for bursts that can tolerate the round-trip delay required for the reservations. We present the main features of the protocol and describe in detail timing considerations regarding the call setup and the reservation process. We also describe several methods for choosing the protocol parameters so as to optimize performance and present corresponding evaluation results. Furthermore, we compare the performance of the proposed protocol against that of two other typical reservation protocols, a Tell-and-Wait and a Tell-and-Go protocol.