Guoqiang Hu

Does burst assembly really reduce the self-similarity?

Recently, the question has been heavily discussed whether burst assembly in edge nodes of optical burst switching (OBS) networks reduces self-similarity of traffic. Our performance evaluation by analysis and simulation shows that in most cases self-similarity remains unchanged.

Research in optical burst switching within the e-Photon/ONe network of excellence

This paper presents a summary of Optical Burst Switching (OBS) research within the VI framework program e-Photon/ONe network of excellence. The paper includes network aspects such as routing techniques, resilience and contention resolution, together with burst switch architectures. On the other hand, we also discuss traffic analysis issues, Quality of Service (QoS) schemes, TCP/IP over OBS and physical layer aspects for OBS.

Evaluation of Packet Delay in OBS Edge Nodes

In OBS networks, packets are aggregated into bursts in the edge nodes and then send through the all-optical network to the destination node. Most of the delay phenomenon (variable delay) occurs in the edge node, which is an important issue for the QoS provisioning. The paper characterizes the packet delay in the edge node, which is mainly determined by the burst assembly, transmission queuing as well as the characteristic of the incoming IP traffic

Traffic and performance analysis of optical packet/burst assembly with self similar traffic

In this paper analytical and simulative study of optical packet/burst assembly in the presence of self similar input traffic is presented. The influence of the main assembly parameters is studied by simulation for timer and size-based aggregation strategies. Analytical model is proposed to represent the average traffic on optical link with the aim to evaluate system performance. Comparisons with simulation prove that the model is well suited to catch the loss system behaviour.

Deterministic delay guarantee in OBS edge node for premium services

In optical burst switched (OBS) networks, the queueing delay in ingress edge node is an important performance measure. In this paper, we propose a deterministic delay model and derive the upper bound of the burst queueing delay in an edge node. On this basis, the edge-to-edge delay guarantee framework for premium services is further outlined.

OBS vs. OpMiGua - A Comparative Performance Evaluation

Optical Burst Switching (OBS) and Optical Migration Capable Networks with Service Guarantees (OpMiGua) are two all-optical network architectures. In this paper we compare both by means of a quantitative performance evaluation based on simulations. In order to achieve a maximum of comparability both models are chosen as similar as possible and especially are fed with identical traffic. Results show differences regarding loss probabilities at which OpMiGua has a better performance.

Performance Issues in Optical Burst/Packet Switching

This chapter summarises the activities on optical packet switching (OPS) and optical burst switching (OBS) carried out by the COST 291 partners in the last 4 years. It consists of an introduction, five sections with contributions on five different specific topics, and a final section dedicated to the conclusions. Each section contains an introductive state-of-the-art description of the specific topic and at least one contribution on that topic. The conclusions give some points on the current situation of the OPS/OBS paradigms.

A framework for deterministic delay guarantee in OBS networks

In OBS networks, the delay of control packets in the switch control unit (SCU) of core nodes influences burst loss performance in the optical switching and should be constrained. Furthermore, the end-to-end (E2E) delay requirements of premium services need queueing delay guarantee in network nodes throughout the transmission path. For this purpose, a framework for deterministic delay guarantee is proposed in this article. It incorporates the deterministic delay model in the ingress edge node as well as in the SCUs of core nodes. On this basis, the configuration of the assembler and the offset time is addressed by means of an optimization problem under the delay constraints. Scenario studies are carried out with reference to realistic transport network topologies. Compared to statistical delay models in the literature, the deterministic model has advantages in rendering robust absolute delay guarantee for individual FEC flows, which is especially appreciated in the provisioning of premium services. By performance evaluation in comparison with the statistical models, it is shown that the adopted deterministic delay models lead to practical delay bounds in a magnitude that is close to the delay estimations by stochastic analysis.

The Research Agenda in Optical Burst Switching in e-Photon/ONe

Summary form only given. This talk provides an overview of the current research in optical burst switching within the EU network of excellence e-Photon/ONe, comprising network aspects such as routing techniques, resilience and contention resolution, together with burst switch architectures. On the other hand, we also discuss traffic analysis issues, quality of service (QoS) schemes, TCP/IP over OBS and physical layer aspects for OBS