Tran Minh Trung

Ph.D., Hanoi University of Science and Technology – School of Electronics and Communications

Optical Burst Switching (OBS) Networks

Posted by trungtm on June 22, 2007

I. Research Topics

Since Optical Burst Switching (OBS) Networks do not have internal buffers of intermediate routers, the path for burst packets must be reserved through control packets. However, the fact that the blocking probability becomes relatively high results in lower performance. One of main issues on OBS networks is how to reduce the blocking probability for high performance. Another is to provide Quality of Service (QoS) for many kinds of traffic types such as video and audio. To satisfy the expected QoS, the parameters like bandwidth and delay should be guaranteed. For these purposes, we have focus on the following two topics.

  1. Burst level congestion control Edge node of OBS networks generate burst packet. Core node forwards the burst packet onto another core node or edge node. The edge node ‘ s generating the burst packet may be controlled by using feed back mechanism for high throughput. This project investigates the effect of feed-back types and messages and designs the optimal feedback system for high throughput.
  2. Transport protocol on OBS networks The performance of TCP is tightly related to packet loss. The high blocking probability originates the low performance of TCP on OBS networks. To overcome the limitation, we propose new mechanism of loss recovery and congestion control in TCP for high throughput of TCP on OBS networks.
  3. OBS-NS simulator OBS-NS simulator was developed in 2004. We manage and improve the OBS-NS simulator and will add new features proposed in our project.

This project is sponsored by Optical Internet Research Center (OIRC) and Korea Science and Engineering Foundation (KOSEF)

Extra topics

  1. Traffic Grooming in WMD optical networks .

II. Publication

  1. T.M.Trung , N.T.T.Thao, J.H.Mo, “A Simple Cost and Time Efficient Traffic Grooming Algorithm” , in Proc. The 4th International Conference on Optical Communications and Networks (ICOCN2005) & IEEE Traffic grooming workshop, Boston, USA, 2005.

III. Released OBS-NS source code

  1. Download link:
  2. Document:

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