OBS Core Node Research Articles

A Retrial Queueing Model with Scheduling Admission Control in QoS Supporting for FDL-equipped at OBS Core Node

A Retrial Queueing Model with Scheduling Admission Control in QoS Supporting for FDL-equipped at OBS Core Node

Mô hình hàng đợi retrial cho đường trễ quang FDL tại nút lõi OBS xét chất lượng dịch vụ QoS

Optical Burst Switching networks are considered as an important candidate for future transport networks. Many analysis models of the OBS core node with FDLs have been proposed recently. Our paper proposes a novel retrial queueing model at OBS core node architecture SPL - feed-forward with QoS. Blocking probability will be calculated based on Markov multi-dimensional models. Numerical results from the proposed analysis method are compared with simulation, as well as between these model.

A Retrial Queueing model with FDL at OBS core node

Optical Burst Switching networks are considered as an important candidate for the future transport networks. Many analysis models of OBS node with FDLs have been proposed recently. In this paper, we propose a novel retrial queueing model at OBS core node architecture SPL - feed-forward. Blocking probability will be calculated based on Markov multi-dimensional models. Numerical solution values from the proposed analysis method are compared with simulation, as well as between these models.

Mô hình phân tích kết hợp chuyển đổi bước sóng và FDL tại nút lõi mạng OBS với lưu lượng tổng quát GI

Optical Burst Switching networks are considered as an important candidate for the future transport networks. Many analysis models of OBS node with wavelength conversion and FDLs have been proposed recently. In this paper, we propose an approximate analytic model at OBS core node architecture SPL – FF (Share-Per-Link - Feed-Forward) for generally distributed arrivals (GI), including Poisson flow, specifically treating IPP distributed interarrival times. Blocking probability will be calculated based on Markov multi-dimensional models and approximation model. Numerical solution values from the proposed analysis method are compared with simulation, as well as between these models.

An analytical model of SPL-Feed-Forward OBS core nodes with mixed renewal and poisson process inputs.

An analytical model of SPL-Feed-Forward OBS core nodes with mixed renewal and poisson process inputs.

Traffic analysis in optical burst switching networks: a trace‐based case study

AbstractOptical burst switching (OBS) appears as a promising technology for building dynamic optical transport networks. The main advantage of OBS is that it allows for dynamic allocation of resources at sub‐wavelength granularity. Nevertheless, the burst contention problem, which occurs frequently inside the network, has to be addressed before OBS can be really deployed as the next generation optical transport network. Recently a lot of attention is devoted to different approaches for resolving contentions in OBS networks. Although performance analysis of these approaches is strongly dependent on the traffic characteristics in the network, the majority of the studies is so far based on very hypothetical traffic assumptions. In this study we use traces of real measurements in the Internet to derive realistic data about the traffic that is injected into the OBS network. Specifically, we investigate the marginal distributions of burst size, burst interdeparture time, assembly delay and number of packets per burst as well as the burstiness of the burst traces. We demonstrate that the performance of an OBS core node using the real traces is pretty similar to the results obtained when the traffic arriving to the core node is assumed to be Poisson. In fact, usage of the Poisson as the process of burst arrival to the core node leads in all the investigated cases to an upper bound on the burst drop rate at that node. Copyright © 2009 John Wiley & Sons, Ltd.

Optical burst switching: a new area in optical networking research

In this tutorial, we give an introduction to optical burst switching and compare it with other existing optical switching paradigms. Basic burst assembly algorithms and their effect on assembled burst traffic characteristics are described first. Then a brief review of the early work on burst transmission is provided, followed by a description of a prevailing protocol for OBS networks called just-enough-time (JET). Algorithms used as an OBS core node for burst scheduling as well as contention resolution strategies are presented next. Trade-offs between their performance and implementation complexities are discussed. Recent work on QoS support, IP/WDM multicast, TCP performance in OBS networks, and labeled OBS is also described, and several open issues are mentioned.