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On-line permutation routing on WDM all-optical networks

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1 Author(s)
Qian-Ping Gu ; Sch. of Comput. Sci., Simon Fraser Univ., Burnaby, BC, Canada

For a sequence (s1, t1), ..., (si, ti), ... of routing requests with (si, ti) arriving at time step i on the wavelength-division multiplexing (WDM) all-optical network, the on-line routing problem is to set-up a path si → ti and assign a wavelength to the path in step i such that the paths set-up so far with the same wavelength are edge-disjoint. Two measures are important for on-line routing algorithms: the number of wavelengths used and the response time. The sequence (s1,t1), ..., (si, ti), ... is called a permutation if each node in the network appears in the sequence at most once as a source and at most once as a destination. Let Hn be the n-dimensional WDM all-optical hypercube. We develop two on-line routing algorithms on Hn. Our first algorithm is a deterministic one which realizes any permutation by at most 3(n-1)/2 + 1 wavelengths with response time O(2n). The second algorithm is a randomized one which realizes any permutation by at most (3/2 + δ)(n-1) wavelengths, where δ can be any value satisfying δ ≥ 2/(n-1). The average response time of the algorithm is O(n(1 + δ)/δ). Both algorithms use at most O(n) wavelengths for the permutation on Hn. This improves the previous bound of O(n2).

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Parallel Processing, 2002. Proceedings. International Conference on

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