Just-In-Time Optical Burst Switching for Multiwavelength Networks

Abstract

We describe the architecture, performance analysis and simulation result of a novel switching paradigm for optical WDM networks called Just-In-Time Optical Burst Switching (JIT-OBS) designed for ultra-low-latency transport of data-bursts across an optical WDM network. It combines the desirable features of circuit-switching and packet-switching, and features an out-of-band signaling scheme on a separate control channel with explicit feedback on delivery of data-bursts. We provide a performance analysis and simulation of the JIT-OBS approach, and compare its performance with those of circuit-switching and packet-switching approaches. We find that it has the best latency performance among the different switching mechanisms, and it has a better throughput performance than circuit-switching, and its performance is insensitive to network propagation delays.

Performance analyses of optical burst-switching networks

“…• A variation of the just-in-time (JIT) protocol [14], whereby the control packet is not aware of the burst length and reserves the relevant link bandwidth (if available) for the entire burst as soon as it arrives at the switch. We consider a variation without acknowledgment as the maximal burst size is relatively small compared with the link transmission capacity.…”

A queueing network model of an edge optical burst switching node

“…E(B k ) and c 2 (B k ) can be calculated as in expressions (6) and (7). We approximate the service time distribution of the aggregate class as a two-stage Coxian distribution using moment matching.…”

“…It is then modeled by an M/M/m/K queue, where m is the number of wavelengths and K − m is the capacity of the buffer. Wei et al [7] considered multiple classes of bursts, each of which is a Poisson arrival process. It is wellknown that the Poisson process is not a good model for wide area traffic, and it is unlikely that the burst arrival processes in future optical networks will be accurately characterized by the Poisson model.…”

Blocking probabilities of optical burst switching networks based on reduced load fixed point approximations

“…A preferred option for optical packet switching systems is Optical Burst Switching (OBS) (see [10], [12], [15], [17] and [18]) that has been proposed as an efficient switching technique to exploit the terabit bandwidth of Wavelength Division Multiplexing (WDM) transmission technology.…”

“…• A variation of the Just-In-Time (JIT) protocol [18], whereby the reservation (control) packet is not aware of the burst length and reserves the relevant link bandwidth (if available) for the entire burst as soon as it arrives at the switch. The variation we consider is without acknowledgement as the maximal burst size is typically small compared with the link transmission capacity.…”