The Investigation of Self-similar Traffic for OBS Assembly

This paper investigates the traffic properties before and after assembly in edge node of Ethernet over optical burst switching (OBS) network for the first time. The features of the edge access system are that (i) Forty Ethernet sources aggregate into optical burst edge node. Moreover they all generate self-similar traffic and have the same parameters. (ii) The packet size of sources follows Pareto distribution with the range from 64 to 1518 bytes. (iii) Packets are assembled into bursts according to four classes and fifteen output ports. Burst and interarrival time distributions are simulated under time-based and length-based assemble schemes. Self-similar traffic Hurst parameter is compared through R/S and V/T plot. Finally three self-similar traffic generating methods are given. Simulation results demonstrate that, multi-source traffic increases self-similar degree, however after assembly, time-assembly scheme can decrease self-similar degree, and aggregated burst size is close to Gaussian distribution. Length-assembly method has no effect on the self-similarity of input traffic. RMD is fit for study of burst network with large self-similarity.