During the past years, TCP has proven to be unable to perform properly in wireless environments, with high bandwidth-delay product paths and bandwidth variation. The recent development of advanced 3G networks and services makes it necessary to find ways to improve TCP’s efficiency and resource utilization, as well as improve the user’s experience and reduce latency times.
This report presents a proxy-based solution called Radio Network Feedback, which aims at improving the performance of TCP over 3G networks. The solution proposes the use of a proxy to split the TCP connection between remote servers and mobile terminals. It manages to adapt the parameters of the connection to the wireless link characteristics, by making use of the information provided by the Radio Network Controller. The results are evaluated through a set of simulations that compare the performance of Radio Network Feedback to that of TCP.
The simulation results show that the Radio Network Feedback solution greatly improves the link utilization when used over wireless links, compared to TCP. It manages to reduce latency times, especially during Slow Start and after and outage. It also succeeds in maintaining reduced buffer sizes,and properly adapts to varying network conditions.
2005. , 80 p.