Comparison of resilience mechanisms for dynamic services in intelligent optical networks

Schupke, Dominic; Jäger, Monika; Hülsermann, Ralf

doi:10.1109/drcn.2003.1275345

Cited by 20 publications

(13 citation statements)

References 7 publications

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“…The STG problem was considered in previous studies [6] [8]. In dynamic STG [6], performance metrics include wavelength and port usage for Protection-at-Connection (PAC) level and Protection-at-Lightpath (PAL) level.…”

Section: Introductionmentioning

confidence: 99%

Lightpath-Level Protection versus Connection-Level Protection for Carrier-Grade Ethernet in a Mixed-Line-Rate Telecom Network

Batayneh

Schupke²,

Hoffmann³

et al. 2007

IEEE GLOBECOM 2007-2007 IEEE Global Telecommunications Conference

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Ethernet is a success story in Local Area Networks (LAN). Efforts for extending its boundaries beyond LAN to the carriers' backbone networks are in progress. We study the problem of designing reliable and cost-efficient high-rate (100 Gbit/s) carrier-grade Ethernet in a multi-line-rate telecom network under signal transmission-range constraints. Reliability is achieved using shared-path protection at two levels: (1) Protection-at-Connection (PAC) level, or (2) Protection-at-Lightpath (PAL) level. We study the two cases for their impact on network cost and other performance parameters. We construct a graph, called Mixed Topology (MT), using which it is possible to: (1) identify traffic grooming possibilities, (2) select a path which requires the minimum amount of 3R regeneration, and (3) effectively choose the data rate of a lightpath to be established. Our algorithms, tested on the 17-node German network, lead to the following findings: (1) for both PAL and PAC, our MT-based algorithm resulted in lower network cost and higher lightpath utilization compared with other schemes; and (2) in general, PAL incurs slightly higher cost than PAC.

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Section: Introductionmentioning

confidence: 99%

Lightpath-Level Protection versus Connection-Level Protection for Carrier-Grade Ethernet in a Mixed-Line-Rate Telecom Network

Batayneh

Schupke²,

Hoffmann³

et al. 2007

IEEE GLOBECOM 2007-2007 IEEE Global Telecommunications Conference

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“…the product of mean holding time and arrival rate) is 1. Furthermore, the a1354_1.pdf OWA2.pdf original demands defined in COST266 [3] are multiplied by a linear demand scaling factor S (as also used by [10]) to assess the blocking probability in the future when the total network traffic has increased leading to lower inter-arrival times because all demands need to be fulfilled in the same total simulation time. We assumed the lowest granularity of demands to be 10 Gb/s.…”

Section: Regenerator Placement and Constraint-based Routing Modelmentioning

confidence: 99%

Physical Impairment Based Regenerator Placement and Routing in Translucent Optical Networks

Pachnicke

Paschenda

Krummrich

2008

OFC/NFOEC 2008 - 2008 Conference on Optical Fiber Communication/National Fiber Optic Engineers Conference

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A novel constraint-based routing (CBR) algorithm taking into account the dominant linear and nonlinear fiber optical transmission impairments has been analyzed. It is shown that CBR and intelligent regenerator placement decrease the blocking probability significantly. IntroductionIn future transparent optical transmission systems automatic wavelength switching will be introduced (automatically switched optical network, ASON). The rapidly increasing traffic demands require solutions, which reduce the operational expenditure by efficient routing. In the past, opaque (employing optoelectronic conversions at each node), fully-transparent or translucent (with selective regeneration) networks have been investigated. Because of the high cost of optoelectronic conversions and limited reach in fully-transparent networks the translucent topology seems to be the most promising candidate for future wavelength agile longhaul networks.Physical degradation effects such as noise, linear impairments and nonlinear fiber effects affect the signal quality along the transmission path. Depending on the channel load and transmission distance some paths cannot be set up fully transparently because the transmission quality requirements (i.e. pre-FEC bit error ratio (BER) = 10 -9 or Q-factor = 15.56 dB) cannot be fulfilled. In the last couple of years the inclusion of physical layer effects in the network operation and routing has been a topic of intensive research (e.g., [1],[2]). In this paper we propose a combined approach of regenerator placement based on the estimated signal degradation along the links and nodes and constraint-based routing (CBR) to set up paths according to the demands. We show -for the first time to our knowledge -that the combined approach of regenerator placement and routing, both based on physical degradation effects, may significantly decrease the blocking probability in a realistic network scenario with a varying dispersion map and different span lengths. Investigated networkFor the investigations the COST266 reference network (large topology) has been chosen [3]. This network has pan-European dimensions (37 nodes and 57 links) in a mesh topology (Fig. 1, left). System simulations have shown that for very long paths in the COST266 network the nonlinear fiber effects of cross-phase modulation (XPM) and four-wave mixing (FWM) cannot be neglected when 10 Gb/s NRZ-OOK modulation is employed (Fig. 2). This is why we included the analytical models presented in [4] in our CBR approach to assess XPM and FWM. From Fig. 2 an average transparent reach of approximately 1820 km for SSMF can be observed. However, there are short paths with poor signal quality (min. 1280 km) and long paths with good quality (max. 2220 km) making an accurate assessment of the actual signal quality desirable. In the COST266 reference network only link lengths and demands have been defined. For the assessment of the signal quality, however, it is essential to know the physical parameters of the links. For this purpose a heuristic ap...

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“…Survivable designs in WDM network with or without wavelength conversion using p-cycles were studied in [5]. In [6], the performance of different resilience mechanisms in protecting dynamic traffic was studied. The concept of Protected Working Capacity Envelopes…”

Section: Introductionmentioning

confidence: 99%

A p-cycle based survivable design for dynamic traffic in WDM networks

Fang

Somani

2005

GLOBECOM '05. IEEE Global Telecommunications Conference, 2005.

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Achieving both high capacity efficiency and fast restoration speed is a primary goal of survivable design in WDM network. The pcycle method aims to benefit from the fast restoration of ring-like protection and high capacity efficiency of mesh protection. In this paper, we first present a p-cycle based method to deal with dynamic traffic in survivable WDM network design. In this method, we first find an optimal set of p-cycles for the given network topology. Next, we propose three routing strategies for accommodating dynamic requests upon their arrival time. The performance of our p-cycle based design using different routing strategies are compared with that of the Shared Backup Path Protection (SBPP). The results show that proposed p-cycle based design method performs better than SBPP in dense networks. Whereas SBPP performs better than the p-cycle based design in sparse networks. IEEEGlobecom 2005 1869 0-7803-9415-1/05/$20.00 © 2005 IEEE 0-7803-9415-1/05/$20.00 © 2005 IEEE 0-7803-9415-

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Comparison of resilience mechanisms for dynamic services in intelligent optical networks

Cited by 20 publications

References 7 publications

Lightpath-Level Protection versus Connection-Level Protection for Carrier-Grade Ethernet in a Mixed-Line-Rate Telecom Network

Lightpath-Level Protection versus Connection-Level Protection for Carrier-Grade Ethernet in a Mixed-Line-Rate Telecom Network

Physical Impairment Based Regenerator Placement and Routing in Translucent Optical Networks

A p-cycle based survivable design for dynamic traffic in WDM networks

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