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Performance Analysis of Optical Packet Switches with Reconfiguration Overhead
KuanHung CHOU Woei LIN
Publication
IEICE TRANSACTIONS on Communications
Vol.E94B
No.6
pp.16401647 Publication Date: 2011/06/01
Online ISSN: 17451345
DOI: 10.1587/transcom.E94.B.1640
Print ISSN: 09168516 Type of Manuscript: PAPER Category: Fundamental Theories for Communications Keyword: stochastic analysis, optical communication, discretetime system, stochastic decomposition, batch arrival,
Full Text: PDF>>
Summary:
In optical packet switches, the overhead of reconfiguring a switch fabric is not negligible with respect to the packet transmission time and can adversely affect switch performance. The overhead increases the average waiting time of packets and worsens throughput performance. Therefore, scheduling packets requires additional considerations on the reconfiguration frequency. This work intends to analytically find the optimal reconfiguration frequency that minimizes the average waiting time of packets. It proposes an analytical model to facilitate our analysis on reconfiguration optimization for inputbuffered optical packet switches with the reconfiguration overhead. The analytical model is based on a Markovian analysis and is used to study the effects of various network parameters on the average waiting time of packets. Of particular interest is the derivation of closedform equations that quantify the effects of the reconfiguration frequency on the average waiting time of packets. Quantitative examples are given to show that properly balancing the reconfiguration frequency can significantly reduce the average waiting time of packets. In the case of heavy traffic, the basic roundrobin scheduling scheme with the optimal reconfiguration frequency can achieve as much as 30% reduction in the average waiting time of packets, when compared with the basic roundrobin scheduling scheme with a fixed reconfiguration frequency.

