CLTCP: An Adaptive TCP Congestion Control Algorithm Based on Congestion Level

Abstract

The Transmission Control Protocol (TCP) has been profusely used by diverse applications such as FTP, email and HTTP. In recent decades, numerous TCP variants have been developed to fit the fast increasing of network capacities and improve the performance of TCP algorithms in various scenarios especially in the high bandwidth-delay product (high-BDP) and lossy networks. Although the performance improvements are different for different TCP under different networking conditions, implementing a new congestion control algorithm that is suitable for a wide range of network conditions is still a challenge. In this paper, we propose a novel scheme, the Congestion Level based TCP (CLTCP), which could perform effectively in both high-BDP and lossy networks. Different from the TCP-FIT, the CLTCP doesn't use the delay variation but the congestion level as a signal to control the number of virtual parallel flows in a TCP connection. This could avoid the influence of the delay measurement error in the TCP-FIT. Extensive experiments in NS-2 show that the performance of the CLTCP is significantly improved as compared to other state-of-the-art algorithms, while maintaining good fairness.Index Terms-Virtual parallel TCP, congestion level, high bandwidth-delay product network, lossy network.

Delay - aware bandwidth estimation and intelligent video transcoder in mobile cloud

“…Whenever, a device state change occurs, the device information updates in the cloud server for the registered mobile users and the estimated bandwidth fits the congestion window. There is a lot of research on bandwidth estimation [14], and TCP congestion control algorithms exist in the literature [15][16][17][18][19][20]. Lai et al shows that the buffering in the transport layer reduced to deliver a good quality of video live streaming in mobile [13].…”