Providing Service Differentiation for Optical-Burst-Switched Networks

Abstract

This paper proposes a service differentiation scheme called preemptive wavelength reservation protocol (PWRP) to provide proportional quality of service (QoS) for optical-burst-switched (OBS) networks. In the context of service differentiation, traffic is divided into different service classes based on traffic characteristics. A service differentiation scheme then provides different degrees of resource assurance to different classes of traffic in proportion to their service classes. Unlike existing approaches, which may degrade to classless schemes or which may suffer from low wavelength utilization, the mechanism in this paper is robust and efficient and supports an incremental deployment of QoS support. A usage profile for each class is maintained at the router, and a preemptive wavelength reservation mechanism is implemented to ensure QoS. An analytical model is derived and simulations are conducted to evaluate the performance. The results show that the approach described in this paper performs better than existing mechanisms in terms of lower blocking probability and higher resource utilization, making it an excellent QoS mechanism for OBS networks.

Joint Path and Resource Selection for OBS Grids with Adaptive Offset Based QoS Mechanism

“…This scheme is based on selective segmentation, deflection and dropping is applied at the ingress router depending on the service class of the burst. [34] proposes and analyzes a preemptive wavelength reservation scheme. A low priority burst may be preempted before or during the transmission by a high priority burst to satisfy QoS requirements.…”

An efficient multiclass mechanism for optical burst-switching networks

“…In this section, we present the analytical model developed for the proposed mechanism based on the Erlang loss model [5], [7], [8]. We assume that the burst link arrival is a Poisson process with rate λ and the burst size is exponentially distributed with mean 1/µ for all service classes.…”

“…RELATED WORK Quality of service support is a challenging issue in OBS networks. Several mechanisms [5], [6], [7], [8] have been proposed to address this point.…”

A novel ingress node design for video streaming over optical burst switching networks

“…Optical burst switching is envisioned as the technology that will support growing future bandwidth needs efficiently, as in many ways it combines the merits of OCS and OPS while overcoming their shortcomings [2,3]. However, with the prevalence of triple-play services (i.e., data, voice, and video) and web-based multimedia applications, Quality of Service (QoS) differentiation has become a crucial issue for future OBS networks intended for practical deployment [4][5][6].…”