Abstract:
An analytical expression for the burst loss rate is proposed on the basis of a one-way
protocol in a slotted optical burst-switching network with wavelength conversion
capability. In this protocol; a wavelength is reserved" (in a core node) for a burst
immediately after the arrival of the corresponding control packet. In our analysis, a
slotted timing model is used in which the entire time period of a burst is divided; each of
divided duration is called slot time. Burst loss rate is related with different network
design parameters such as wavelength conversion capability, burst arrival" probability,
network traffic, number of slots per burst and number of wavelengths. Further, analytical
expression for burst loss rate is also extended which shows the relationship of burst loss
rates between two different service classes. Each service class has a fixed number of
reserved wavelengths. If the transmitted" burst of one service class is smaller than the
number of reserved wavelengths, the excess reserved wavelengths of that service class
are used to carry burstS of dIe other service class. In this situation, an algorithm is
developed to calculate the number of wavelengths for each service classes. The burst loss
rates between two service classes is differentiated'where one service class has increasing
number of reserved wavelengths and the other service class has decreasing number of
reserved wavelengths in an OBS network with constant number of wavelengths.
Performance results are evalilated in terms of burst loss rate (BLR) for wavelength
conversion capability, burst arrival probability, network traffic, number of slots per burst
and number of wavelengths. Results show that system performance improves with the
increasing of wavelength conversion capability and number of wavelengths but the
system performance degrades whli the increasing of burst arrival probability and number
of slots per burst or network traffic. The model results are found to be satisfactory
agreement with the expected results.
The anlll)-iicalresults of this thesis wi/Hind application in design of a WDM system in a
slotted optical burst switching network with wavelength conversion capability.
