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Optical Switching and Networking 2 (2005) 217229 www.elsevier.com/locate/osn

Summary: Optical Switching and Networking 2 (2005) 217229
Rate-controlled optical burst switching for both congestion
avoidance and service differentiation
H. Boyraz1, N. Akar
Electrical and Electronics Engineering Department, Bilkent University, TR-06800 Bilkent, Ankara, Turkey
Received 23 May 2005; received in revised form 21 December 2005; accepted 27 January 2006
Available online 3 March 2006
Optical Burst Switching (OBS) has recently been proposed as a candidate architecture for the next generation optical Internet.
Several challenging issues remain to be solved to pave the way for the OBS vision. Contention arises in OBS networks when two
or more bursts are destined for the same wavelength, and a wide variety of reactive contention resolution mechanisms have been
proposed in the literature. One challenging issue in OBS is proactively controlling the traffic flowing through the OBS network
so that the network does not stay in a persistent state of contention, which we call the congestion avoidance problem. Another
challenging issue is the need for service differentiation, which is common today in electronically switched networks via the use
of advanced buffer management and scheduling mechanisms. However, such mechanisms cannot be used in OBS networks due to
the limited use, or total absence, of buffering. One of the popular existing approaches to service differentiation in OBS networks
is the use of larger offset times for high-priority bursts which, however, increases the delays and may adversely affect application-
level performance. In this paper, we propose a feedback-based rate control protocol for the control plane of the OBS network to
both address the congestion avoidance and service differentiation issues. Using this protocol, the incoming traffic is dynamically


Source: Akar, Nail - Department of Electrical and Electronics Engineering, Bilkent University


Collections: Engineering