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

Improving performance of delay-based TCPs with rerouting

“…However, rerouting may lead to the change of the end-to-end fixed delay, which is the sum of propagation delay and packet processing time, and therefore bring about inaccurate estimation of the minimum of ever measured RTTs (BaseRTT). This may erroneously affect the delay-based TCP's adjustment of the congestion window size (CWND) [4], [5], [6], [7]. Several works [5], [6], [7] have been proposed to improve TCP performance with rerouting, but they have some limits and drawbacks.…”

“…This may erroneously affect the delay-based TCP's adjustment of the congestion window size (CWND) [4], [5], [6], [7]. Several works [5], [6], [7] have been proposed to improve TCP performance with rerouting, but they have some limits and drawbacks. In [5] the authors proposed a modification to TCP Vegas to counteract the rerouting problem by assuming any lasting increase in RTT as a sign of rerouting.…”

“…Depending on the network conditions, TCP Vegas-A [6] uses adaptive values of two thresholds, α and β, instead of 1 and 3 respectively; however, when the route of a connection is changed, TCP Vegas-A may not react this event immediately and may not reach the available bandwidth after rerouting occurs. In order to know whether the end-toend fixed delay is changed, RoVegas [7] obtains the forward and backward queuing times by performing its accumulate queuing time (AQT) scheme in routers along the round-trip path. However, this mechanism works well only when all bottleneck routers along the round-trip path are AQT-enabled.…”

A Review on Snoop with Rerouting in Wired cumWireless Networks

“…This may affect the TCP"s adjustment of the congestion window size (CWND) [4], [5]. Several works [5], [6] have been proposed to improve TCP performance with rerouting, but they have some limits and drawbacks.…”