Architectural and technological issues for future optical Internet networks

Listanti, Marco; Eramo, V.; Sabella, R.

doi:10.1109/35.868147

Cited by 118 publications

(39 citation statements)

References 18 publications

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“…Sources S -SN employ an infinite FTP flow to the respective destination D1 -DN (N=20). Optical links have 1 Figure 12 shows the loss probability for each egress node as a function of the burst length with the parameters 1 /, = 200,u sec, 1/A = 2msec, M = 1, the nodal processing delay A = 50,usec and the assembly timeout T = lOmsec. The statistics of the generated bursts is grouped into 10 bins according to the number of packets in the burst, which ranges from 1 to a maximum value of 60 packets.…”

Section: Burst Length Dependent Lossesmentioning

confidence: 99%

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Effect of Number of Burst Assemblers on TCP Performance in Optical Burst Switching Networks

Gurel

Karasan

2006

2006 3rd International Conference on Broadband Communications, Networks and Systems

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Abstract-Burst assembly mechanism is one of the fundamental factors that determine the performance of an optical burst switching (OBS) network. In this paper, we investigate the influence of number of burstifiers on TCP performance for an OBS network. An ns2-based OBS network simulator is developed for simulating the optical network. The goodput of TCP flows between an ingress and an egress nodes traveling through an optical network is studied for different values of the number of assembly buffers per destination. First, the losses resulting from the congestion in the core OBS network are modeled using a burst independent Bernoulli loss model. Then, a background burst traffic is generated to create contention at a core node in order to realize a burst dependent loss model. Simulation results show that for an OBS network employing timer-based assembly algorithm, TCP goodput increases as the number of burst assemblers is increased for both types of loss models. The improvement from one burstifier to moderate number of burst assemblers is significant (15-50% depending on the burst loss probability, processing delay and the TCP version), but the goodput difference between moderate number of buffers and perflow aggregation is relatively small, implying that a cost-effective OBS edge switch implementation should use moderate number of assembly buffers per destination for enhanced TCP performance.

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Section: Burst Length Dependent Lossesmentioning

confidence: 99%

“…Increasing demand for services with very large bandwidth requirements, e.g., grid networks, facilitates the deployment of optical networking technologies [1]. Using Dense Wavelength Division Multiplexing (DWDM) technology, optical networks are able to meet the huge bandwidth requirements of future Internet Protocol (IP) backbones [2].…”

Section: Introductionmentioning

confidence: 99%

Effect of Number of Burst Assemblers on TCP Performance in Optical Burst Switching Networks

Gurel

Karasan

2006

2006 3rd International Conference on Broadband Communications, Networks and Systems

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“…OBS with offset: in this category, the data burst is delayed at the source [11,12] and sent after a short delay as shown in figure 2a. This offset must be long enough to cover the processing time at all intermediate nodes.…”

Section: Optical Burst Switcidng Techniquesmentioning

confidence: 99%

Segmented Burst Switching: Enhancement of Optical Burst Switching to Decrease Loss Rate and Support Quality of Service

Maach

Bochmann

2003

Next Generation Optical Network Design and Modelling

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Abstract:With the growing demand of bandwidth and the development being made in the optical components technology, the IP over DWDM using optical burst switching seems to be the best solution to take advantage of the huge capacity of the fiber and accommodate high traffic of information. In this architecture the optical network is seen as an optical cloud with intelligent edges capable to interpret the IP address and store the information in electronic domains as well as checking and correcting errors. Optical burst switching [1,3] achieves better bandwidth exploitation because all the fiber wavelengths are shared among the bursts without resource pre-allocation and the whole wavelength capacity can be used by a burst. However with higher load, contention increases, and hence the number of dropped burst increases leading to a big lost of performance. Several methods can be used to lower the burst-dropping probability such as wavelength conversion [5] and the use of buffers [6], but these solutions are still not there due to the high cost and the immaturity of technology. In this paper we will propose another method where the burst is segmented into several parts of equal length and in case of contention only the parts at the beginning, causing the conflict, will be discarded. We will analyze and compare this method with other practical methods: delayed burst, deflection routing. The segments of burst can be used to carry different class of service since the dropping probability of each segment depends on its position in the burst. The parts at the end have the smallest probability to be dropped. We prove trough analysis and simulation that the segmented burst improves the performance and is more suitable for traffic with several class of service. 70 Abdelilah Maach , Gregor von BochmannKey words: Optical network, optical burst switching, contention resolution, segmented burst switching INTRODUCTIONWavelength division multiplexing WDM consists of the use of several light paths in the same fiber. This increases tremendously the capacity of the fiber, which makes it a good solution to face the increasing demand of bandwidth. At the beginning the network consisted of electronic switch connected by optical fibers. At each intermediate node, the data has to be converted to the electronic domain and stored temporarily while the header is being processed. Unfortunately the electronic processing and conversions limits the speed of the network, and doesn't exploit all the advantages of WDM. Fwthermore the network cost is very high due to the components used to perform opto-electronic conversion and storage. The trend now is to keep the information as long as possible in the optical domain, which can overcome the limitations imposed by the electronic processing and optoelectronic conversion as well as the buffering problems while providing high speed, high transparency and decreases the network cost. The trend in photonic network is to carry IP traffic directly over the DWDM. [7]; in this kind of network only a small part...

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“…Increasing demand for services with very large bandwidth requirements facilitates the deployment of optical networking technologies [1]. Using Dense Wavelength Division Multiplexing (DWDM) technology, optical networks are able to meet the huge bandwidth requirements of future Internet Protocol (IP) backbones.…”

Section: Introductionmentioning

confidence: 99%

Using multiple per egress burstifiers for enhanced TCP performance in OBS networks

Gurel

Karasan

2008

Photon Netw Commun

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Burst assembly mechanism is one of the fundamental factors that determine the performance of an optical burst switching (OBS) network. In this paper, we investigate the influence of the number of burstifiers on TCP performance for an OBS network. The goodput of TCP flows between an ingress node and an egress node traveling through an optical network is studied as the number of assembly buffers per destination varies. First, the burst-length independent losses resulting from the contention in the core OBS network using a non-void-filling burst scheduling algorithm, e.g., Horizon, are studied. Then, burst-length dependent losses arising as a result of void-filling scheduling algorithms, e.g., LAUC-VF, are studied for two different TCP flow models: FTP-type long-lived flows and variable size short-lived flows. Simulation results show that for both types of scheduling algorithms, both types of TCP flow models, and different TCP versions (Reno, Newreno and Sack), TCP goodput increases as the number of burst assemblers per egress node is increased for an OBS network employing timer-based assembly algorithm. The improvement from one burstifier to moderate number of burst assemblers is significant (15-50% depending on the burst loss probability, perhop processing delay, and the TCP version), but the goodput difference between moderate number of buffers and per-flow aggregation is relatively small, implying that an OBS edge A preliminary version of this paper was presented at the Sixth International Workshop on Optical Burst/Packet Switching (WOBS), Oct. 2006.G. Gurel · E. Karasan (B) Department of Electrical and Electronics Engineering, Bilkent University, 06800 Ankara, Turkey e-mail: ezhan@ee.bilkent.edu.tr G. Gurel e-mail: guray@ee.bilkent.edu.tr switch should use moderate number of assembly buffers per destination for enhanced TCP performance without substantially increasing the hardware complexity.

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Architectural and technological issues for future optical Internet networks

Cited by 118 publications

References 18 publications

Effect of Number of Burst Assemblers on TCP Performance in Optical Burst Switching Networks

Effect of Number of Burst Assemblers on TCP Performance in Optical Burst Switching Networks

Segmented Burst Switching: Enhancement of Optical Burst Switching to Decrease Loss Rate and Support Quality of Service

Using multiple per egress burstifiers for enhanced TCP performance in OBS networks

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