Feedback-based adaptive speedy transmission (FAST) control protocol to improve the performance of TCP over Ad-Hoc networks

Abstract

The main purpose of this research is to develop the performance improvement solution for use of TCP over Ad-Hoc networks. This research is implemented in Network Simulator2. This research analyzed the different the major techniques proposed in the past by different researchers, including TCP-DOOR, End-to-End Approach, Feedback Scheme and the Adaptive Back-off Response Approach protocols. Based on the review of existing works, the authors propose to combine the feedback and the adaptive approach to make it adaptable to most major scenarios. Next to that, to further enhance the overall performance, it is proposed to change underlying behavior of Standard TCP to its HS-TCP or its variant MX-TCP (depending on network conditions). From the findings of this research, it was found that MX-TCP is more appropriate for lossy-links such as driving on highway or low bandwidth 2G and accessing public hotspots or Internet and so on. It was also observed that HS-TCP is more appropriate and useful in high bandwidth scenarios like the Fourth generation Mobile Data Network with lower latency. Thus the modified approach of combining the Feedback Scheme with Adaptive Back-off based Response was observed to help TCP perform better compared to working with any of these protocols in isolation. Finally, HS-TCP/ MX-TCP addressed the throughput limitations, thereby delivering the maximum performance and enhanced end-user experience. Future scope for this research can be to bring in the intelligence wherein the protocol can detect the network conditions as well as the external environmental factors like power and then select whether to use MX-TCP or HS-TCP.