On Achieving the Optimal Performance of FDL Buffers Using Burst Assembly

Choi, Jung Yul; Vu, Hai L.; Kang, Minho

doi:10.1109/lcomm.2007.071350

Cited by 6 publications

(6 citation statements)

References 5 publications

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“…Since the burst transmission at the cores is entirely at the optical domain and with the absence of potential optical buffers, there is a possibility of two or more bursts contend at the same outgoing channel and at the same instant. This phenomenon is There are a number of resolution mechanisms available like wavelength conversion [5], segmentation [6], optical buffering [7] and deflection routing [8].…”

Section: Fig -2: Burst Header Packet (Bhp) Formatmentioning

confidence: 99%

Spectral Threat in TCP Over Optical Burst Switched Networks

Fernandez¹

2014

IJRET

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Section: Fig -2: Burst Header Packet (Bhp) Formatmentioning

confidence: 99%

Spectral Threat in TCP Over Optical Burst Switched Networks

Fernandez¹

2014

IJRET

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“…Assuming that time t > 0, the arrival rate of IP packets λ packet (t) can be changed as time goes by, and ρ burst (t) and D(t) can be obtained as traffic load changes. Consequently, the average burst length L burst (t) [7] can be altered by the following equation.…”

Section: Optimal Burst Length In a Single Node With Fdl Buffersmentioning

confidence: 99%

“…Extensive studies on contention resolution suggested using fiber delay line (FDL) buffer [5][6][7][8], wavelength converter (WC) [1], deflection routing [9], burst segmentation [10], burst retransmission [11], and a feedback-based contention avoidance mechanism [12].…”

Section: Introductionmentioning

confidence: 99%

“…However, in reality, manipulating the granularity of FDL buffers is not practicable once the granularity is fixed [6]. Choi et al [7] studied a way to achieve the optimal performance of FDL buffers with a fixed granularity by manipulating the size threshold of the burst assembly. Rostami and Wolisz [8] inquired into the optimal granularity of FDL buffers at the environment of assembling multiple IP streams into a burst.…”

Section: Introductionmentioning

confidence: 99%

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An adaptive load-aware burst assembly scheme to achieve optimal performance of FDL buffers in OBS networks

Jeong¹,

Choi

Kang³

2008

Photon Netw Commun

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Optical burst switching (OBS) is regarded as one of the most promising switching technologies for next generation optical networks. Contention resolution of data bursts is a critical mission to implement practical OBS. The use of fiber delay line (FDL) buffers has received a lot of attention as a fundamental but effective solution to resolve burst contention. Several studies have investigated the way to achieve the optimal performance of FDL buffers at a single-node level. However, this article studies how to achieve the best performance of OBS networks with FDL buffers under varying traffic condition at a network level. For this purpose, we propose an adaptive load-aware burst assembly (ALBA) scheme, which adaptively adjusts the size threshold of burst assembler optimized to the current network traffic load. A piggybacking method used to deliver the traffic-load information from core nodes to ingress edge nodes accelerates the adaptiveness of the proposed scheme by reducing the update time of the size threshold. The effectiveness of the ALBA scheme is proved by comparing with No-FDL case and fixed size-threshold cases under changing traffic-load environment from extensive simulation tests.

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“…In order to ensure acceptable performance for Internet application services, OBS needs to overcome several roadblocks, especially including data burst contention. Extensive studies on contention resolution suggested the use of fiber delay line (FDL) buffers [5] and [6], Wavelength converters (WC) [1], deflection routing [7], burst segmentation [8], burst retransmission [9], and a feedback-based contention avoidance mechanism [10]. In spite of previous efforts to resolve the contention problem, it remained as a hurdle to guarantee quality of service (QoS).…”

Section: Introductionmentioning

confidence: 99%

A tree-based slot allocation algorithm for loss-free slotted OBS networks

2009

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Optical burst switching (OBS) is regarded as one of the most promising switching technologies for next generation optical networks. However, the data burst contention problem is still unresolved thoroughly even though slotted OBS (SOBS) is studied as a new paradigm reducing the blocking rate. In this article, we propose a tree-based slot allocation (TSA) algorithm for loss-free SOBS networks, where the TSA algorithm originally avoids contention of the time-slots by reserving the time-slots with different timeslot positions for the source nodes, respectively. In order to manage the time-slots efficiently, we also propose an OBS superframe, which is a cyclic period and consists of multiple time-slots transmitted by the source nodes toward the same incoming port of a destination node. In addition, we attempt to optimize multiplexing of the OBS superframes to reduce wavelength consumption. On the other hand, when incoming traffic is beyond expectation, a source node may need more time-slots to prevent packet loss because of buffer overflow. For reallocation of the time-slots, we propose a flow control scheme managing some number of shared time-slots, where a control node adaptively allocates (or redeems) the time-slots to (or from) source nodes by utilizing the shared H. Jeong (B) Long Term Evolution R&D Laboratory, DMC, time-slots based on fluctuating traffic condition. Simulation results show that the blocking rate of the proposed TSA-OBS scheme is zero with acceptable queueing delay at moderate traffic offered loads. In addition, multiplexing optimization simulated in the 14-node NSFNET achieves a 63% reduction of wavelength consumption. Moreover, the proposed flow control scheme assisting the TSA algorithm maintains a target upper-bound of queueing delay at the source node, so that packet loss caused by buffer overflow is prevented.

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On Achieving the Optimal Performance of FDL Buffers Using Burst Assembly

Cited by 6 publications

References 5 publications

Spectral Threat in TCP Over Optical Burst Switched Networks

Spectral Threat in TCP Over Optical Burst Switched Networks

An adaptive load-aware burst assembly scheme to achieve optimal performance of FDL buffers in OBS networks

A tree-based slot allocation algorithm for loss-free slotted OBS networks

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