NDLI: Grooming of Symmetric Traffic in Unidirectional SONET/WDM Rings

Content Provider	IEEE Xplore Digital Library
Author	Yong Wang Qian-Ping Gu
Copyright Year	2006
Description	Author affiliation: School of Computing Science, Faculty of Applied Science, Simon Fraser University, Burnaby B.C. Canada V5A 1S6 Email: qgu@cs.sfu.ca (Qian-Ping Gu) \|\| School of Computing Science, Faculty of Applied Science, Simon Fraser University, Burnaby B.C. Canada V5A 1S6 Email: ywangb@cs.sfu.ca (Yong Wang)
Abstract	In SONET/WDM networks, a wavelength channel is shared by multiple low-rate traffic demands. The multiplexing is known as traffic grooming and realized by SONET add-drop multiplexers (SADM). The grooming factor is the maximum number of low-rate traffic demands that can be multiplexed in one wavelength. Since SADMs are expensive, a key optimization problem in traffic grooming is to minimize the number of SADMs. This optimization problem is challenging and NP-hard even for unidirectional SONET/WDM ring networks with symmetric unitary traffic demands. In this paper, we propose an algorithm for this NP-hard problem. For a set R of symmetric pairs of unitary traffic demands on a SONET ring with n nodes, and a grooming factor of k, our algorithm grooms R into [\|R\|]/k wavelengths using at most [(1 + 1/k)\|R\|] + [n/4] SADMs. It can be proved that there exists an instance whose optimal solution requires as many as (1 + 1/k)\|R\| + \|R\|/2k SADMs, which is very close to our upper bound. For the guaranteed performance, our algorithm achieves a better approximation ratio than previous ones. Our algorithm uses the minimum number of wavelengths that are also precious resources in optical networks. In addition, the experimental results show that our algorithm has much better practical performance than the previous algorithms in most cases.
Starting Page	2407
Ending Page	2414
File Size	199716
Page Count	8
File Format	PDF
ISBN	1424403553
ISSN	81649547
DOI	10.1109/ICC.2006.255130
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2006-06-11
Publisher Place	Turkey
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	SONET Wavelength division multiplexing Telecommunication traffic WDM networks Clocks Approximation algorithms Costs Optical fibers Protection Optical fiber communication graph decomposition Traffic grooming SONET/WDM networks unidirectional rings approximation algorithm
Content Type	Text
Resource Type	Article

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