Summary: 148 IEEE COMMUNICATIONS LETTERS, VOL. 13, NO. 2, FEBRUARY 2009
Exact Analysis of Offset-Based Service Differentiation in
Single-Channel Multi-Class OBS
H. Emre Kankaya and Nail Akar
Abstract--We study a multi-class optical burst switching (OBS)
node using the horizon reservation scheme. Multiple traffic
classes are differentiated using different offset times per class.
Assuming Poisson burst arrivals and phase-type distributed burst
lengths, we exactly solve for per-class blocking probabilities using
the well-known theory of feedback Markov fluid queues.
Index Terms--OBS, horizon reservation, offset-based service
differentiation, Markov fluid queues.
OPTICAL Burst Switching (OBS) is a candidate archi-
tecture for the future optical Internet that is based on
aggregation of client packets into so-called bursts at the edge
of the OBS domain. When a burst is formed, its reservation
request is signalled out of band using a burst control packet
(BCP). The burst is transmitted after an offset time and is
transported in the optical domain. When a BCP arrives at the