QoS sensitive fuzzy backoff schemes in policing mechanisms

Fuzzy controllers provide an efficient method to handle inexact information as a basic of reasoning. In fuzzy control, the controller can be represented by if-then-else rules. The controller is processing exact input data and is producing exact output data in a deterministic way. However, backoff time computation schemes, namely: fuzzy control backoff time (FB), pseudorandom backoff (PB) time, exponential backoff (EB) time and random backoff (RB) time that are applicable in waiting time re-arrangement in queue. None of these backoff schemes are good for all traffic rates. One scheme may carry well at one certain rate while no longer applicable if rate is changeable. In this paper, we propose a fuzzy backoff schemes in policing mechanism (FP) is introduced. FP involves the policing mechanisms which function prior to the waiting room. The performance of FP is evaluated vis-a-vis ones from pseudorandom backoff scheme (PB), random backoff scheme (RB), exponential backoff scheme (EB) and fuzzy control backoff scheme (FB). Simulation results show that the FP helps improve the amount of conforming frames as well as helps reduce non-conforming frames compared to the other four backoff schemes. In conclusion, FP is appropriate for the QoS required media while RB is only good for bandwidth sensitive case