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Journal of Optical Communications and Networking

Journal of Optical Communications and Networking

  • Editor: Richard A. Linke
  • Vol. 3, Iss. 1 — Jan. 2, 2004
  • pp: 50–74

Traffic grooming for survivable WDM networks: dedicated protection [Invited]

Canhui (Sam) Ou, Keyao Zhu, Jing Zhang, Hongyue Zhu, Biswanath Mukherjee, Hui Zang, and Laxman Sahasrabuddhe  »View Author Affiliations


Journal of Optical Networking, Vol. 3, Issue 1, pp. 50-74 (2004)
http://dx.doi.org/10.1364/JON.3.000050


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Abstract

We investigate the survivable traffic-grooming problem for optical mesh networks employing wavelength-division multiplexing (WDM) and dedicated protection. We consider the dynamic-provisioning environment in which a connection arrives at random, holds for a random amount of time, and then departs. A typical connection request may require bandwidth less than that of a wavelength, and it may also require protection from network failures, typically fiber cuts. On the basis of generic grooming-node architecture, we propose two approaches--protection-at-lightpath (PAL) level and protection-at-connection (PAC) level--for grooming a connection request. Here we investigate dedicated protection. In a companion paper [IEEE J. Sel. Areas Commun. 21, 1367 (2003)], we investigate shared protection, which leads to a substantially different treatment. For dedicated protection, we prove that the problem of provisioning a connection under PAC is NP-complete, propose effective heuristics for both schemes, and define comprehensive performance metrics to compare PAL with PAC with respect to wavelength or grooming-port efficiency. Our findings are as follows. Under today's typical connection-bandwidth distribution in which lower-bandwidth connections outnumber higher-bandwidth connections, PAC outperforms PAL (in terms of bandwidth-blocking ratio, lightpath use, and wavelength use) if the number of grooming ports is large; however, PAL outperforms PAC (in terms of bandwidth-blocking ratio and grooming-port use) when the number of grooming ports is moderate or small.

© 2003 Optical Society of America

OCIS Codes
(060.4250) Fiber optics and optical communications : Networks
(060.4510) Fiber optics and optical communications : Optical communications

ToC Category:
FOCUS: Survivable Optical Networks

History
Original Manuscript: September 10, 2003
Revised Manuscript: September 9, 2003
Published: January 2, 2004

Citation
Canhui (Sam) Ou, Keyao Zhu, Jing Zhang, Hongyue Zhu, Biswanath Mukherjee, Hui Zang, and Laxman Sahasrabuddhe, "Traffic grooming for survivable WDM networks: dedicated protection [Invited]," J. Opt. Netw. 3, 50-74 (2004)
http://www.opticsinfobase.org/jocn/abstract.cfm?URI=jon-3-1-50

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