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Proceedings Paper

A new method for solving routing and wavelength assignment problems under inaccurate routing information in optical networks with conversion capability
Author(s): Yanting Luo; Yongjun Zhang; Wanyi Gu
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Paper Abstract

In large dynamic networks it is extremely difficult to maintain accurate routing information on all network nodes. The existing studies have illustrated the impact of imprecise state information on the performance of dynamic routing and wavelength assignment (RWA) algorithms. An algorithm called Bypass Based Optical Routing (BBOR) proposed by Xavier Masip-Bruin et al can reduce the effects of having inaccurate routing information in networks operating under the wavelength-continuity constraint. Then they extended the BBOR mechanism (for convenience it's called EBBOR mechanism below) to be applied to the networks with sparse and limited wavelength conversion. But it only considers the characteristic of wavelength conversion in the step of computing the bypass-paths so that its performance may decline with increasing the degree of wavelength translation (this concept will be explained in the section of introduction again). We will demonstrate the issue through theoretical analysis and introduce a novel algorithm which modifies both the lightpath selection and the bypass-paths computation in comparison to EBBOR algorithm. Simulations show that the Modified EBBOR (MEBBOR) algorithm improves the blocking performance significantly in optical networks with Conversion Capability.

Paper Details

Date Published: 19 November 2009
PDF: 8 pages
Proc. SPIE 7633, Network Architectures, Management, and Applications VII, 76331R (19 November 2009); doi: 10.1117/12.850996
Show Author Affiliations
Yanting Luo, Beijing Univ. of Posts and Telecommunications (China)
Yongjun Zhang, Beijing Univ. of Posts and Telecommunications (China)
Wanyi Gu, Beijing Univ. of Posts and Telecommunications (China)

Published in SPIE Proceedings Vol. 7633:
Network Architectures, Management, and Applications VII
Ken-ichi Sato; Lena Wosinska; Jing Wu; Yuefeng Ji, Editor(s)

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