An Efficient Network Utilization Scheme for Optical Burst Switched Networks

An Efficient Network Utilization Scheme for Optical Burst Switched Networks

Rajneesh Randhawa (Regional Institute of Management and Computer Sciences, India), J.S. Sohal (Ludhiana College of Engineering and Technology, India), Amit Kumar Garg (Shri Mata Vaishno Devi University (J&K), India) and R. S. Kaler (Thapar University, India)
Copyright: © 2010 |Pages: 16
DOI: 10.4018/jitr.2010040103
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Abstract

Optical Burst Switching (OBS) is one of the most important switching technologies for future IP over wavelength division multiplexing (WDM) networks. In OBS Network, the burst assembly technique is a challenging issue in the implementation of the system. Burst assembly influences burst characteristics, which negatively impacts network performance. In this paper, the authors propose an efficient hybrid burst assembly approach, which is based on approximate queuing network model. To reduce the time complexity, an approximate queuing network model has been considered. Throughput performance has been investigated, taking into account both burst loss probability and time complexity. Simulation results have shown that the proposed hybrid approach based on variable burst length threshold and fixed maximum time limitation provides Simulation results have also shown a good trade-off between burst blocking performance and scheduling time.
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Introduction

With the rapid advancements in dense wavelength division multiplexing (DWDM) technology, it is possible to use 80–120 separate wavelengths on a single fiber, each supporting a data rate of more than 400 Gbits/s. Nevertheless, there is a relative marginally increase in the electronic processing speed, which means that data optically transmitted would be slowed down at each node if it is switched electronically. So, it is expected that IP packet can be transported directly over optical layer without any Optical to Electrical and Electrical to Optical (O/E/O) conversions. However, both currently existing switching paradigms, namely optical circuit switching (OCS) and optical packet switching (OPS) have inherent shortcomings to support bursty traffic. OCS has low bandwidth utilization because it has a large bandwidth provisioning timescale. An OPS has a good adaptation to the bursty traffic, however, it faces two major challenges:

  • Lack of optical random access memory

  • Stringent requirement for synchronization

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