Traffic shaping and scheduling for OBS-based IP/WDM backbones

Elhaddad, Mahmoud; Melhem, Rami; Znati, Taieb; Basak, Debashis

doi:10.1117/12.533541

Cited by 7 publications

(8 citation statements)

References 17 publications

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“…When the processing threshold is reached, the batch is processed and all bursts going to the same destination are grouped and the information about the new batch go into the same control packet to decrease the overhead imposed [11]. The inclusion of the acceptance window into the offset time increases the end-to-end delay experienced by the packets assembled in a burst.…”

Section: Theorem 42mentioning

confidence: 99%

An Optimal Batch Scheduling Algorithm for OBS Networks

Figueiredo

Xavier

Fonseca

2009

GLOBECOM 2009 - 2009 IEEE Global Telecommunications Conference

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This paper introduces an optimal batch scheduling algorithm for the scheduling of batches of bursts in optical burst switching networks. The algorithm, called BATCHOPT, considers both the requests being processed in the current batch and the requests previously scheduled in the search for an optimal solution. Moreover, an extended version of the JET reservation protocol is proposed for efficiently handling batches of bursts. Results obtained via simulation show that the BATCHOPT algorithm produces good performance when compared to other proposed existing algorithms.

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Section: Theorem 42mentioning

confidence: 99%

An Optimal Batch Scheduling Algorithm for OBS Networks

Figueiredo

Xavier

Fonseca

2009

GLOBECOM 2009 - 2009 IEEE Global Telecommunications Conference

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“…One way to perform the traffic shaping is through a burst assembly mechanism [15][16][17][18]. In [19], the authors propose regulating data bursts by combining periodic traffic reshaping at source nodes and a proactive reservation scheme. Traffic rerouting on alternative shortest paths (or load splitting) can also be implemented in order to reduce contentions on congested links.…”

mentioning

confidence: 99%

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

2007

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In this article we describe a feedback-based OBS network architecture in which core nodes send messages to source nodes requesting them to reduce their transmission rate on congested links. Within this framework, we introduce a new congestion control mechanism called congestion control with explicit reduction request (CCERQ). Through feedback signals, CCERQ proactively attempts to prevent the network from entering the congestion state. Basic building blocks and performance tradeoffs of CCERQ are the main focus of this article.

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“…Proactive reservation signaling promotes control plane efficiency by dividing the overhead of a reservation packet over multiple reservation requests [5]. The ingress periodically generates a control packet that contains the requested time slots during a target interval.…”

Section: Proactive Reservationmentioning

confidence: 99%

“…A channel scheduler in PRS maintains a time-slot allocation vector (calendar), for each buffer place, as well as for the channel itself [5]. At any given time, the channel scheduler and the switch controller operate on different parts of the calendar.…”

Section: Shaping and Contention Resolutionmentioning

confidence: 99%

“…Motivated by the dominance of TCP traffic on the Internet and the sensitivity of TCP throughput to packet loss, we introduced Proactive Reservation-based Switching (PRS) [5], a reservation-based slotted switching architecture that is built on the switching and signaling technology of OBS, to achieve the following goals: (1) To minimize the buffer capacity required at the core switches for TCP traffic to utilize the network bandwidth efficiently, (2) to allow flexibility in the allocation of bandwidth to elastic ingress-egress traffic aggregates, (3) to minimize the delay suffered by packets at the ingress of the network, and (4) to promote efficient use of control plane bandwidth. PRS defines a set of high-level transmission control functions for IP networks based on the OBS technology, specifically, reservation signaling, traffic shaping and scheduling at the edge routers and core switches.…”

Section: Introductionmentioning

confidence: 99%

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Decoupling packet loss from blocking in proactive reservation-based switching

Elhaddad

Melhem

Znati

First International Conference on Broadband Networks

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We consider the maximization of network throughput in buffer-constrained optical networks using aggregate bandwidth allocation and reservation-based transmission control. Assuming that all flows are subject to loss-based TCP congestion control, we quantify the effects of buffer capacity constraints on bandwidth utilization efficiency through contention-induced packet loss. The analysis shows that the ability of TCP flows to efficiently utilize successful reservations is highly sensitive to the available buffer capacity. Maximizing the bandwidth utilization efficiency under buffer capacity constraints thus requires decoupling packet loss from contention-induced blocking of transmission requests. We describe a confirmed (two-way) reservation scheme that eliminates contention-induced loss, so that no packets are dropped at the network's core, and loss can be incurred only at the adequately buffer-provisioned ingress routers, where it is exclusively congestion-induced. For the confirmed signaling scheme, analytical and simulation results indicate that TCP aggregates are able to efficiently utilize the successful reservations independently of buffer constraints.

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Traffic shaping and scheduling for OBS-based IP/WDM backbones

Cited by 7 publications

References 17 publications

An Optimal Batch Scheduling Algorithm for OBS Networks

An Optimal Batch Scheduling Algorithm for OBS Networks

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

Decoupling packet loss from blocking in proactive reservation-based switching

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