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Proceedings Paper

An effect scheme for fixed-length tunnel allocation in hierarchical WDM networks
Author(s): Tse-Yu Lo; Chien Chen; Ying-Yu Chen
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Paper Abstract

In this paper, we investigate the static tunnel allocation problem in multigraularity optical cross-connect (MG-OXC) networks. Our goal is to allocate a set of tunnels that minimize the blocking probability for the dynamic traffic that will follow the prior-known historical traffic matrix. A heuristic Capacity-Balanced Static Tunnel Allocation (CB-STA) has been proposed, which always tries to allocate a tunnel from the node with maximal predicted traffic going out to the node with maximal predicted traffic coming in. However, the tunnel length constraint is not carefully considered while selecting node pairs. Thus, this work proposes a heuristic, Weighted Tunnel Allocation (WTA), to improve CB-STA. WTA adds some additional edges with predefined hop length, termed auxiliary links, to the original topology to form an auxiliary graph. Node pair incident to an auxiliary link means that there could be tunnels allocated for it. By routing the historical traffic on the auxiliary graph, preference of tunnel allocation for each node pair incident to the auxiliary link can be estimated. Finally the tunnels will be allocated according to the preference. The simulation results show that WTA outperforms CB-STA in all switching type combinations.

Paper Details

Date Published: 8 February 2005
PDF: 9 pages
Proc. SPIE 5626, Network Architectures, Management, and Applications II, (8 February 2005); doi: 10.1117/12.576788
Show Author Affiliations
Tse-Yu Lo, National Chiao Tung Univ. (Taiwan)
Chien Chen, National Chiao Tung Univ. (Taiwan)
Ying-Yu Chen, National Chiao Tung Univ. (Taiwan)


Published in SPIE Proceedings Vol. 5626:
Network Architectures, Management, and Applications II
S. J. Ben Yoo; Gee-Kung Chang; Guangcheng Li; Kwok-wai Cheung, Editor(s)

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