Keeping the packet sequence in optical packet-switched networks

Authors:
F. Callegati;D. Careglio;W. Cerroni;G. Muretto;C. Raffaelli;J. Solé Pareta;P. Zaffoni
Affiliations:
Dipartimento di Elettronica, Informatica e Sistemistica, University of Bologna, Viale Risorgimento, 2, 40136 Bologna, Italy;Advanced Broadband Communications Center (CCABA), Universitat Politècnica de Catalunya, Jordi Girona, 1-3, Modul D6, 08034 Barcelona, Spain;Dipartimento di Elettronica, Informatica e Sistemistica, University of Bologna, Viale Risorgimento, 2, 40136 Bologna, Italy;Dipartimento di Elettronica, Informatica e Sistemistica, University of Bologna, Viale Risorgimento, 2, 40136 Bologna, Italy;Dipartimento di Elettronica, Informatica e Sistemistica, University of Bologna, Viale Risorgimento, 2, 40136 Bologna, Italy;Advanced Broadband Communications Center (CCABA), Universitat Politècnica de Catalunya, Jordi Girona, 1-3, Modul D6, 08034 Barcelona, Spain;Dipartimento di Elettronica, Informatica e Sistemistica, University of Bologna, Viale Risorgimento, 2, 40136 Bologna, Italy
Venue:
Optical Switching and Networking
Year:
2005

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Abstract

This paper deals with optical packet switches with limited buffer capabilities, subject to asynchronous, variable-length packets and connection-oriented operation. The focus is put on buffer scheduling policies and queuing performance evaluation. In particular a combined use of the wavelength and time domain is exploited in order to obtain contention resolution algorithms that guarantee the sequence preservation of packets belonging to the same connection. Four simple algorithms for strict and loose packet sequence preservation are proposed. Their performance is studied and compared with previously proposed algorithms. Simulation results suggest that by accepting some additional processing effort it is possible to guarantee very low packet loss probabilities while avoiding the out-of-sequence delivery.