An Adaptive Fuzzy Control Double Leaky Bucket Using Backoff Time and Backpressure in Policing Mechanism Schemes over VDSL Network17 An Adaptive Fuzzy Control Double Leaky Bucket Using Backoff Time and Backpressure in Policing Mechanism Schemes over VDSL Network

When congestion occurs in VDSL networks, it will drop incoming frames because the buffer fills up frames until it overflows. In backpressure algorithm suitable for low traffic [1], it prevents buffer overflows. In backoff time in leaky bucket over traffic policing mechanism suitable for high traffic [2], Backoff time computations are wildly used in order to avoid the impact on the network performance. In this paper, we propose a fuzzy control doubleleaky bucket using backpressure and backoff time detects violations in parameter negotiation. We evaluate and compare the performance of a fuzzy control backpressure and backoff time in double-leaky bucket as a policing mechanism (FBBD), a leaky bucket (LB), a jumping window (JW), a triggered jumping window (TJW) and a double-leaky bucket (DLB). The performance of fuzzy control backpressure and backoff time in double-leaky bucket was investigated through fluctuations in telecommunications traffic streams (burst/silent type). Simulation results show that in VDSL frames, the fuzzy logic control system helps improve the performance of our fuzzy control double-leaky bucket using backpressure and backoff time schemes as a policing mechanism much better than conventional policing mechanism by about 25 % in terms of conforming and nonconforming frames once various types of burst/silence traffic are generated.