Abstract
Recently, with multimedia services such as IPTV, video conferencing has emerged as a main traffic source. When UDP coexists with TCP, it induces not only congestion collapse but also an unfairness problem. In this paper, a new Active Queue Management algorithm, called Traffic Sensitive Active Queue Management (TSAQM), is proposed for providing multimedia services in routers. The TSAQM is comprised of Dynamic Weight Allocate Scheme (DWAS) and Service Guarantee Scheme (SGS). The purpose of DWAS is to fairly allocate resources with high end-user utility, and the SGS is to determine the satisfactory threshold (TH) and threshold region (TR). Besides, a multiqueue design for different priority traffic, and threshold TH and threshold region TR is proposed to achieve the different QoS requirements. Several objectives of this proposed scheme include achieving high end user utility for video services, considering the multicast as well as unicast proprieties to meet interclass fairness, and achieving the QoS requirement by adaptively adjusting the thresholds based on the traffic situations. Performance comparisons with the GRED-I are in terms of packet dropping rate and throughput to highlight the better behavior of the proposed schemes due to taking into account the fairness and different weights for video layers.
Highlights
In order to improve the congestion collapse problem, the early TCP protocol has prompted the study of end-to-end congestion avoidance and control algorithms [1]
When User Datagram Protocol (UDP) coexists with TCP, it induces congestion collapse problem and unfairness problem that each flow cannot get the same treatment and causes the Internet unstable and lower link utilization
The Traffic Sensitive Active Queue Management (TSAQM) scheme is proposed to overcome those problems. Several objectives of this proposed scheme are described as follows: first, a Dual methodology congestion control algorithm is proposed to meet the QoS requirement of different services by using multi-queues multi-thresholds mechanism cooperating with weight-based scheduler algorithm; second, it achieves high end-user utility for video service; third, it considers the multicast as well as unicast proprieties to meet inter-class fairness; fourth, it has the ability to adaptively adjust parameters of TSAQM according as time-varying traffic loads
Summary
In order to improve the congestion collapse problem, the early TCP protocol has prompted the study of end-to-end congestion avoidance and control algorithms [1]. The main objective of this category is to achieve the incoming data rate that is equal to the output link capacity of router, and each traffic flow is allocated the same bandwidth and ensures the lower queue sizes at the same time This category can eliminate the high bandwidth-delay product network effect on the TCP’s throughput, which is inversely proportional to the RTT, to satisfy the TCP-friendly property [3]. The Traffic Sensitive Active Queue Management (TSAQM) scheme is proposed to overcome those problems Several objectives of this proposed scheme are described as follows: first, a Dual methodology congestion control algorithm is proposed to meet the QoS requirement of different services by using multi-queues multi-thresholds mechanism cooperating with weight-based scheduler algorithm; second, it achieves high end-user utility for video service; third, it considers the multicast as well as unicast proprieties to meet inter-class fairness; fourth, it has the ability to adaptively adjust parameters of TSAQM according as time-varying traffic loads.
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