A Detailed Analysis and Performance Comparison of Wavelength Reservation Schemes for Optical Burst Switched Networks

摘要

We present a detailed analysis of the JIT, JET, and Horizon wavelength reservation schemes for optical hurst switched (OBS) networks. Our analysis accounts for several important parameters, including-the burst offset length, and the optical switching and hardware processing overheads associated with bursts as they travel across the network. The contributions of our work include: (ⅰ) analytical models of JET and Horizon (on a single OBS node) that are more accurate than previously published ones, and which are valid for general burst length and offset length distributions; (ⅱ) the determination of the regions of parameter values in which a more complex reservation scheme reduces to a simpler one; and (ⅲ) a new reservation scheme, JIT~+ , which is as simple to implement as JIT, but whose performance tracks that of Horizon and JET. We compare the performance of the four wavelength reservation schemes on a single OBS node, as well as on a path of OBS nodes with cross traffic, under various sets of parameter values. Our major finding is that, under reasonable assumptions regarding the current and future state-of-the-art in optical switch and electronic hardware technologies, the simplicity of JIT and JIT~+ seem to outweigh any performance benefits of Horizon and JET.