QoS supporting control packet scheduling strategy in optical burst switched networks

In Optical Burst Switched (OBS) networks, the requirements on packet loss probability vary for different class users. In order to meet different packet loss probability demands, besides the traditional methods to support Differentiated services (DiffServ) by resource allocation and contention resolution, the scheduling of control packets should also support DiffServ. A new type of scheduling strategy, Priority-based Weight Fair Queuing (PWFQ) scheduling strategy, is proposed. An equivalent analysis model is also presented to simplify the solving process of scheduling weight of each class. We also define a parameter, normalized deviation factor, to evaluate the validity of our analysis model as well as the fairness of scheduling strategy on supporting DiffServ. Numerical results confirm that, it is feasible to analyze queue system, in which PWFQ scheduling strategy is adopted, with our equivalent model. At the same time, it confirms that our scheduling strategy performs well on providing fair DiffServ in terms of packet loss probability.

[1]  Vinod Vokkarane,et al.  Burst segmentation: an approach for reducing packet loss in optical burst switched networks , 2002, 2002 IEEE International Conference on Communications. Conference Proceedings. ICC 2002 (Cat. No.02CH37333).

[2]  Marco Listanti,et al.  Performance evaluation of a new technique for IP support in a WDM optical network: optical composite burst switching (OCBS) , 2002 .

[3]  Parameswaran Ramanathan,et al.  Proportional differentiated services: delay differentiation and packet scheduling , 1999, SIGCOMM '99.

[4]  Mounir Hamdi,et al.  Proportional QoS over OBS networks , 2001, GLOBECOM'01. IEEE Global Telecommunications Conference (Cat. No.01CH37270).

[5]  David E. McDysan.  QoS & traffic management in IP & ATM networks , 2000 .

[6]  Chunming Qiao,et al.  Optical burst switching (OBS) - a new paradigm for an Optical Internet^{1} , 1999, J. High Speed Networks.

[7]  Hiroyuki Morikawa,et al.  Priority-based wavelength assignment algorithm for burst switched photonic networks , 2002, Optical Fiber Communication Conference and Exhibit.

[8]  Chunming Qiao,et al.  Efficient channel scheduling algorithms in optical burst switched networks , 2003, IEEE INFOCOM 2003. Twenty-second Annual Joint Conference of the IEEE Computer and Communications Societies (IEEE Cat. No.03CH37428).