Analysis of a Bufferless OpMiGua Node

This paper presents a closed form expression and a Markov model estimating packet loss in a bufferless hybrid circuit and packet switched OpMiGua node. Prior traffic analysis of hybrid network nodes are based on preemptive and queue-based priority mechanisms, however, in this article we focus on the time-window approach with its associated reservation induced blocking (RIB). A closed form expression for packet loss is found by minimizing the RIB and is proved to be asymptotically exact for increasing length of circuit packets. A Markov model accounting for the effect of RIB is proposed and simulation is used to determine its accuracy. For lower than 85% share of circuit switched traffic, the respective median and 95-percentile for the relative error equals 10% and 25%. Finally, when circuit packets are aggregated into bursts the total packet loss is reduced for sufficiently high share of circuit traffic. The mechanisms behind this performance gain are identified and methods to maximise its effect are proposed.