A feedback-based congestion control mechanism for labeled optical burst switched networks

Farahmand, Farid; Zhang, Qiong; Jue, Jason P.

doi:10.1007/s11107-007-0093-y

Cited by 8 publications

(3 citation statements)

References 17 publications

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“…Such schemes aim at limiting the amount of traffic sent to prevent the network from blocking. CAC schemes can be based on the analysis of the incoming flow [9], or can take their decision based on feedback received from other nodes [10].…”

Section: Congestion Control In Obs Networkmentioning

confidence: 99%

Adaptive burst admission and forwarding in OBS networks

Rumley

Pedrola

Klinkowski

et al. 2009

2009 11th International Conference on Transparent Optical Networks

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This paper addresses the problem of controlling the performance of optical burst switching (OBS) networks in presence of non-stationary traffic demands. We propose a joint burst admission control and forwarding mechanism that operates in core nodes. This mechanism dynamically adapts its behaviour according to the feedback messages received from other nodes. By not forwarding certain bursts not complying with given requirements, an admission control is implicitly made. Moreover, by forwarding bursts to appropriately selected nodes, traffic balancing is achieved. The advantageous effects of the proposed mechanism can additionally be amplified by granting extra offset time to the burst. The benefits provided by this mechanism are supported by numerical results. Keywords: optical burst switching, adaptive routing, deflection routing, performance analysis. INTRODUCTIONModern communication networks are intended to deal with highly varying traffic conditions. The demands they have to carry out often imply traffic intensities varying both in the short and long term. Since the data traffic is generally statistically multiplexed, the networks that are subject to the varying traffic conditions are always susceptible to congestion states, in particular, to transient congestion due to short term traffic fluctuations, and to semi-permanent congestion due to long term traffic variation. Several approaches have been considered in order to diminish the network congestion under varying traffic demands. One consists in delaying temporarily the data traffic by means of buffering, which allows postponing the transmission until the outgoing link is available. This approach is effective for solving transient congestions but not for semi-permanent ones. It is also possible, when applying proper routing, to take advantage of the whole network capacity rather than only the one available on a specific path. Thus, by distributing intelligently the traffic over the network, permanent congestion can be avoided. Transient congestions can also be alleviated if alternative (or deflection) paths toward destination are explored. Eventually, in critical cases, a Connection Admission Control (CAC) mechanism can limit the amount of traffic entering or travelling through the network. In this way, the traffic supposed to cause congestion anyway is dropped, prior to consume network resources.On the other hand, high-capacity communication networks make an extensive use of photonic technologies. Primarily reserved to point-to-point transmission, fibre optics progressively acquired new functionalities such as switching and routing. With the advent of Wavelength Dimension Multiplexing (WDM) and optical crossconnects (OXC), Optical Circuit Switched (OCS) networks have been deployed, with nodes able to route transparently an optical signal (lightpath) to the next hop. Moreover, two upcoming technologies, Optical Packet Switching (OPS) and Optical Burst Switching (OBS) have been proposed to achieve statistical multiplexing directly at the optical leve...

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Section: Congestion Control In Obs Networkmentioning

confidence: 99%

Adaptive burst admission and forwarding in OBS networks

Rumley

Pedrola

Klinkowski

et al. 2009

2009 11th International Conference on Transparent Optical Networks

View full text Add to dashboard Cite

show abstract

“…Some approaches are based on the modification of signaling protocols [4,13,16] and also on burst preemption [6,10]. These approaches, however, may increase the end-to-end delay of high-priority bursts because of the extra offset introduced [12], and are also hard to implement in practice.…”

Section: Related Workmentioning

confidence: 99%

An efficient admission control mechanism for optical burst-switched networks

et al. 2008

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This article proposes the load-level-based admission control (LLAC) mechanism in order to provide service differentiation for optical burst-switched networks. The LLAC mechanism admits bursts of a given service class according to the network load and a class-associated parameter. Based on this parameter, called load level, the proposed mechanism differentiates the burst blocking probability experienced by each service class. We develop an analytical model for the proposed mechanism and evaluate its performance for different configurations through mathematical analysis. The results show that the load-level-based mechanism reduces the blocking probability of high-priority bursts by two orders of magnitude or more depending on the analyzed scenario. In addition, compared to other similar mechanisms, the loadlevel-based mechanism effectively differentiates the services in all analyzed configurations, requires less states in optical burst switching (OBS) nodes, and does not suffer from priority inversion.

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“…How to survive from failures becomes one of the primary objectives in OBS network design. There have been few works on OBS survivability [14][15][16]. While the restoration mechanism is demonstrated to deal with single-link failure for wavelength-routed OBS in [14], architecture for OBS 1+1 protection based on the multi-protocol label switching (MPLS) protection is developed in [15].…”

Section: Introductionmentioning

confidence: 99%