Performance Evaluation of Phorizon and Pjet_Veot Reservation Schemes for Optical Burst Switching
There have been rapid changes in the networking field in the past decade or so, mainly due to an exponential growth in the number of users and traffic volumes, and emergence of new applications. This has caused a higher demand for bandwidth, with better quality of service and reduced blocking pro...
Saved in:
| Main Author: | |
|---|---|
| Format: | Thesis |
| Language: | English English |
| Published: |
2006
|
| Subjects: | |
| Online Access: | http://psasir.upm.edu.my/id/eprint/210/1/549042_FK_2006_28.pdf |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| Summary: | There have been rapid changes in the networking field in the past decade or so,
mainly due to an exponential growth in the number of users and traffic volumes,
and emergence of new applications. This has caused a higher demand for
bandwidth, with better quality of service and reduced blocking probability.
Meeting this demand efficiently would be possible in high-speed optical networks
with a proper switching paradigm employing dynamic reservation schemes.
Optical burst switching (OBS) is a new switching concept, based on ideas
developed for electronic burst switching almost two decades ago. Now the idea
has evolved to become a paradigm, which combines the best of both switching
techniques i.e. circuit switching and packet switching, thus overcoming the
inherent setbacks in the respective switching techniques. OBS applies an out of
band signaling technique, which enables the bandwidth reservations to be made in
advance.
In this thesis, two modified reservation schemes are proposed based on the
prioritized just enough time (pJET) and Horizon reservation schemes, which are
referred to as the prioritized just enough time with variable extra offset time
(pJET_VEOT) and the prioritized Horizon (pHorizon), respectively.
These reservation schemes are designed to reduce the blocking probabilities of
both classes of traffic, i.e. real-time (RT) and non real-time traffic (NRT), while
provisioning sufficient Quality of Service (QoS) for ensured and timely delivery
of higher priority traffic. Performance evaluation is conducted in order to analyze
the reduction in blocking probability, the effect on system delay and to display the
service differentiation achieved. This is done by comparing the proposed schemes
to its predecessor schemes respectively. The predecessor schemes used in the
simulation are pJET, Just Enough Time (JET) and Horizon The proposed schemes, pHorizon and pJET_VEOT show a significant reduction
in blocking probabilities and along with sufficient provisioning of QoS for both
classes of traffic tested, i.e. the RT and NRT when compared to Horizon, JET and
pJET respectively. |
|---|