Absolute Transmission Delay Guarantee in Optical Burst-Switched Networks: A Scheme and Performance Evaluation

Abstract

Among the promising solutions for next generation Internet backbone, one can consider optical burst switching (OBS) technology. This technology does not, however, provide suitable quality-of-service (QoS) support. Several schemes have been proposed to provide QoS differentiation in OBS networks. The majority of these schemes are based on a relative QoS model in which the performance of a given traffic class is defined in comparison with other classes. A set of mechanisms have been proposed to provide an absolute traffic loss guarantee, but no mechanism has been proposed to handle absolute transmission delay in OBS networks. The aim of this paper is to propose a solution to provide an absolute transmission delay guarantee over an OBS network and thus support emerging multimedia applications with delay and bandwidth constraints based on a network architecture that is suitable for OBS switching and QoS provisioning. We also develop an analytic model based on a queuing system of the proposed solution. Finally, simulation experiments are conducted to validate the proposed scheme and study its features.

TCP management over OBS using burst segmentation and segment retransmission

“…The reader can find in [6,7] a complete description of the OBS network architecture we consider in this paper. An OSB node is mainly composed of: a switching unit (SU), a waiting unit (WU), a switching control unit (SCU), an input processing unit (IPU), and an output-processing unit (OPU).…”

“…The reader can fine in [6] a detailed description of the contention resolution scheme implemented on the considered OBS network architecture. Based on dynamic parameters of the observed traffic, the adopted contention resolution scheme works as follows: For every data segment Si, we mainly consider two parameters: -Si_MBD: maximum network-wide buffering delay.…”

“…Let B i,j n and F i,j n denote the blocking probability of a ST i,j data segment at node n due to the lack wavelengths and FDL buffers, respectively. B i,j n and F i,j n can be analyzed based on a queuing network system and a new conservation law [6,8].…”

“…In this paper, we address the implementation of TCP protocol over a novel OBS network architecture suitable for contention resolution and QoS provisioning [6,7]. The considered architecture is mainly based on the use of a new burst assembly and segmentation technique and a specific contention resolution scheme that combines wavelength conversion, burst segmentation, and optical buffering.…”

A New All-Optical Switching Node Including Virtual Memory and Synchronizer

“…The first scheme is a relative service differentiation based on burst segmentation and a segment-priority based contention resolution. The second scheme aims to provide an absolute QoS guarantee based on the dynamic management of traffic parameters instead of static priorities [8]. Fortunately, both schemes allow a better QoS provision and the optimization of resource utilization in the architecture proposed in this paper.…”