Network packet

TCP Friendly Rate Control

Transmission Control Protocol

Telecommunications

Computer science

Computer network

Proxy (statistics)

Wireless

TCP tuning

Machine learning

Telecommunications link

In recent years, several proxy solutions have been proposed to improve performance of TCP over wireless. The wide popularity of this protocol has pushed for its adoption also in communication contexts, the wireless systems, where the protocol was not intended to be applied. This is the case of High Speed Downlink Packet Data Access (HSDPA), which is an enhancement of third generation wireless systems in that it provides control mechanisms to increase system performance. Despite shorter end-to-end delays, and more reliable successful packet transmission, improving solutions for TCP over HSDPA are still necessary. The goal of this Master thesis project is to explore the possibility of design TCP proxy solutions to enhance user’s data rates over HSDPA. As a relevant part of our activity, we have implemented a TCP proxy solution over HSDPA through a ns2 simulator environment, extending the EURANE simulator. EURANE has been developed within the SEACORN European project, and it introduces three additional nodes to existing UMTS modules for ns2: the Radio Network Controller, the Base Station and the User Equipment. The functionality of these additional nodes allow for the support of the new features introduced by HSDPA. The extension of the EURANE simulator includes all of these HSDPA new features, a proxy solution, as well as some TCP enhancing protocols (such as Eifel). The simulator allows for performance comparison of existing TCP solution over wireless, and the proxy we have studied in this thesis. An analysis of the effects of multi-user data flows over TCP performance have been also addressed.

Downlink TCP Proxy Solutions over HSDPA with Multiple Data Flow