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According to the past researches, a TCP Ve-gas version is able to achieve higher throughput than TCP Tahoe and Reno versions, which are widely used in the current Internet. However, we need to consider a migration path for TCP Vegas to be deployed in the Internet. By fo-cusing on the situation where TCP Reno and Vegas connections share the bottleneck link,(More)
SUMMARY In the present paper, ImTCP-bg, a new background TCP data transfer mechanism that uses an inline network measurement technique, is proposed. ImTCP-bg sets the upper limit of the congestion window size of the sender TCP based on the results of the inline network measurement, which measures the available bandwidth of the network path between the(More)
In this paper, we focus on fairness and stability of the congestion control mechanisms adopted in several versions of TCP by investigating their time–transient behaviors through an analytic approach. In addition to TCP Tahoe and TCP Reno, we also consider TCP Vegas which has been recently proposed for higher throughput, and enhanced TCP Vegas, which is(More)
Recent research on overlay networks has revealed that user-perceived network performance, such as end-to-end delay performance, could be improved by an overlay routing mechanism. However, these studies only consider end-to-end delay, and there are few works focusing on bandwidth-related information, such as available bandwidth and physical capacity. In the(More)
We introduce a new measurement algorithm for the available band-width in a network path between two endhosts. This algorithm is an adaptation from existing active measurement methods for the purpose of being applied in inline network measurement. Inline network measurement method measures the available bandwidth by using packets which an active TCP(More)
In this paper, we propose TCP Symbiosis, which has a robust, self-adaptive and scalable congestion control mechanism for TCP. Our method is quite different from existing approaches. We change the window size of a TCP connection in response to information of the physical and available bandwidths of the end-to-end network path. The bandwidth information is(More)
— In our previous studies, we proposed ImTCP, an inline network measurement technique that can obtain available bandwidth information of the network path between sender and receiver hosts continuously and in an inline fashion. We also introduced ImTCP-bg, a background TCP data transfer mechanism based on the measurement results of ImTCP. In the present(More)
SUMMARY We previously proposed a new version of TCP, called Inline measurement TCP (ImTCP), in [2, 3]. The ImTCP sender adjusts the transmission intervals of data packets and then utilizes the arrival intervals of ACK packets for available bandwidth estimation. This type of active measurement is preferred because the obtained results are as accurate as(More)
In overlay networks, when we consider the effective and accurate measurement of underlay IP network between overlay nodes, it is important to take care the density of the overlay nodes in the network. In this paper, we propose the measurement strategy on the overlay networks which dramatically reduces the number of required measurement tasks for obtaining(More)
1. Fairness among users may not be achieved • Tampered-TCP connections may selfishly monopolize the bandwidth ⇒ Normal TCPs suffer from low throughput 2. tampered-TCP may not work well ex. Augmenting increase ratio of congestion window ⇒ Congestion window becomes large rapidly ⇒ The number of loss packet increases and many timeouts occur ⇒ Tampered-TCP(More)