Threshold based selective link restoration for optical wdm mesh networks

Shenai, R.; Maciocco, Christian; Mishra, Manish Kumar; Sivalingam, Krishna M.

doi:10.1109/drcn.2003.1275335

Cited by 9 publications

(9 citation statements)

References 12 publications

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“…In this section, we present threshold based selective link restoration (ThBR) that we originally proposed in [13]. This scheme utilizes aggregated link load information in order to improve the restoration efficiency of dynamic link restoration.…”

Section: Selective Link Restorationmentioning

confidence: 99%

“…where × Û is the amount of actual bandwidth reserved on a specific link, × Û Ñ Ü is the maximum bandwidth that can be reserved on a specific link, and × Ø Ñ Ü and × Ø Ñ Ò µ represents a configurable threshold window which regulates the amount of bandwidth to be allocated [13]. …”

Section: Threshold Based Selective Segment Restorationmentioning

confidence: 99%

“…A note on the implementation: In an attempt to improve the lookup performance at each pass, the implementation considered use of a hash table of Tries [6,14], hence leading to a worst case time complexity of Ç´Ò µ for every pass , where Ò is the size of the input to pass . With this advantage, this mechanism can be easily extended to cater to large input sizes.…”

Section: Frequently Used Segment Discovery (Fused)-algorithm Descriptionmentioning

confidence: 99%

“…The ThBR mechanism proposed the use of aggregated link load information in order to identify critical or high-risk links in the networks, which are selectively protected as deemed necessary. We first present new detailed results on the performance of the ThBR scheme by using a dynamic routing mechanism and compare it to the static routing scheme considered in [13]. We then extend the ThBR approach to present a segment based restoration mechanism termed threshold based selective segment restoration, where collected lightpath usage information is employed to identify critical segments in the network.…”

Section: Introductionmentioning

confidence: 97%

“…Hence as a first step, this paper considers the influence of collected network state information in a bid to improve the restoration efficiency of a survivability technique -dynamic restoration in this case. This paper builds upon the hybrid protection-restoration mechanism called threshold based selective link restoration (called ThBR) originally proposed in [13]. The ThBR mechanism proposed the use of aggregated link load information in order to identify critical or high-risk links in the networks, which are selectively protected as deemed necessary.…”

Section: Introductionmentioning

confidence: 99%

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Threshold based selective survivability for optical WDM mesh networks

Shenai¹,

Venkatachalam

Maciocco

et al.

First International Conference on Broadband Networks

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This paper presents survivability mechanisms that attempt to improve the overall restoration efficiency of dynamic link restoration in optical WDM mesh networks. The proposed mechanisms make use of network state information such as link load in order to identify critical network sections (such as links or segments) that are subsequently protected by selectively assigning backup capacity ahead of failures. The first approach, termed "Threshold based selective link restoration", utilizes existing link load information to identify critical links, and the second approach, termed "Threshold based selective segment restoration", employs data-analysis techniques to identify critical segments. The overall goal of the proposed algorithms is to improve the restoration efficiency by providing a trade-off between proactive protection and reactive restoration. The experimental results indicate that under high loads, the proposed approaches maintain a consistent restoration efficiency that is at least 10% when compared to dynamic restoration.

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Section: Selective Link Restorationmentioning

confidence: 99%

Section: Threshold Based Selective Segment Restorationmentioning

confidence: 99%

Section: Frequently Used Segment Discovery (Fused)-algorithm Descriptionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

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Threshold based selective survivability for optical WDM mesh networks

Shenai¹,

Venkatachalam

Maciocco

et al.

First International Conference on Broadband Networks

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A Survey of Survivability Techniques for Optical WDM Networks

Sivakumar

Shenai

Sivalingam

2005

Emerging Optical Network Technologies

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In an optical wavelength division multiplexed (WDM) network, link or node failures may result in huge amounts of lost data, due to the enormous fiber throughput. This requires that optical WDM network be designed to be resilient to failures. Thus, survivability can be defined as the ability to respond gracefully to such failures. This chapter presents a comprehensive survey of various mechanisms proposed to achieve survivability. The survey considers different topologies, different failure models, implementation issues, signaling issues and quality-of-protection issues. Keywords:Survivable Optical WDM Networks, Protection and Restoration, Single and dual-link failures, Node failures, Channel failures, Implementation, GMPLSbased Signaling, Quality of Protection. IntroductionOptical fiber based networks, characterized by a bandwidth of over 50 terabits per second (Tb/s), have emerged as the transmission medium of choice for high speed communication due to their capacity, reliability, cost and scalability. Recent advances in optical technology and in particular wavelength division multiplexing (WDM), a multiplexing technique that partitions the bandwidth provided by an optic fiber into individual multi-gigabit channels, have been identified as enabling technologies that will allows us to fully and effectively utilize the fiber capacity [1, 2]. Current optical technology demonstrations have shown a feasibility of 160 channels, each operating at 10 gigabits per second (Gb/s), and future networks are expected to operate at 40 Gb/s per channel or higher.

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