دانلود رایگان مقاله FLOWER، یک پروتکل حمل و نقل فازی نوآورانه پایین تر از حد بهترین تلاش

Abstract

We present a new delay-based transport protocol named FLOWER, that aims at providing a Lower-than-Best-Effort (LBE) service. The objective is to propose an alternative to the Low Extra Delay Background Transport (LEDBAT) widely deployed within the official BitTorrent client. Indeed, besides its intra-fairness problem, known as latecomer unfairness, LEDBAT can be too aggressive against TCP, making it ill suited for providing LBE services over certain networks such as constrained wireless networks. By using a fuzzy controller to modulate the sending rate, FLOWER aims to solve LEDBAT issues while fulfilling the role of a LBE protocol. FLOWER operates to a modification of the standard LEDBAT protocol implementation by replacing its proportional controller by a fuzzy controller. Thanks to this modification, our simulation results show that FLOWER can carry LBE traffic in network scenarios where LEDBAT cannot while solving the latecomer unfairness problem. The presented algorithm is simple to implement and does not require complex computation that would prevent its deployment. Finally, we show that FLOWER remains compliant when used over an AQM-based network and remains LBE while not increasing the bufferbloat.

7. Conclusion

We propose FLOWER, a new delay-based congestion control protocol designed to provide a LBE service using results from the fuzzy logic area. The main goal of FLOWER is to overcome both major LEDBAT drawbacks: aggressiveness and latecomer unfairness, while being LBE compliant. Our simulation study over a wide range of network use-cases shows that FLOWER performs better than LEDBAT in case where it usually fails. To the best of our knowledge, FLOWER is the first solution that solves both the aggressiveness issue inherent to LEDBAT protocol and the fairness issue. Last but not least, we finally showed that FLOWER remains compliant with AQM schemes that aim to mitigate the bufferbloat issue.