Improving congestion avoidance algorithms for asymmetric networks

RoVegas: a router-based congestion avoidance mechanism for TCP Vegas

“…To prevent the performance degradation of TCP Vegas in asymmetric networks, Elloumi et al [13] proposed a modified algorithm. It divides a RTT into a forward trip time and a backward trip time in order to remove the effects of backward path congestion.…”

“…Although Vegas is superior to Reno in the aforementioned aspects, it suffers some problems that inhere in its congestion avoidance scheme, these include issues of rerouting [9], persistent congestion [9], fairness [10][11][12], network asymmetry, [13][14][15], and incompatibility between Reno and Vegas [9,16,17]. All these problems may be obstacles for Vegas to achieve a success.…”

A dynamic delayed acknowledgment mechanism to improve TCP performance for asymmetric links

“…The algorithm that we propose is designed on the basis of previous study [4] in which we propose to separate the RTT evaluation into a Forward trip time (FTT) and a backward trip time (RTT). The main motivation comes from the nature of data congestions that may happen in either direction of a TCP connection.…”

The impact of the DOCSIS 1.1/2.0 MAC protocol on TCP

“…As long as the aggregate load is spread evenly between the upstream channels, the downstream channel can be driven to 100% utilization. Another approach that has been proposed for both DOCSIS and wireless networks is ACK filtering [11,12,13,14]. CableLabs is currently evaluating if they should add ACK filtering capabilities to the next version of DOCSIS [15].…”