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http://dx.doi.org/10.3745/KIPSTC.2003.10C.7.943

TCP Performance Improvement Scheme on Dynamic Wireless Environment over UMTS System  

Kim, Nam-Ki (한국과학기술원 대학원 전자전산학과)
Park, In-Yong (금오공과대학교 컴퓨터공학부)
Yoon, Hyun-Soo (한국과학기술원 전산학과)
Publication Information
The KIPS Transactions:PartC / v.10C, no.7, 2003 , pp. 943-954 More about this Journal
Abstract
The mobile telecommunication system has been growing exponentially after 1990s due to the high population in a city and the growth of mobile user. In this time, the current mobile system mainly concentrates on the voice communication. However, in the next generation, mobile users want to get very diverse services via mobile terminal such as the Internet access, web access, multimedia communication, and etc. For this reason, the next generation system, such as the UMTS (Universal Mobile Telecommunication Services) system, has to support the packet data service and it will play the major role in the system. By the way, since the Web service is based on TCP, most of the Internet traffic TCP traffic. Therefore, efficient transmission of TCP traffic will take very important role in the performance of packet data service. There are many researches about improving TCP performance over wireless network. In those schemes, the UMTS system adapts the link layer retransmission scheme. However, there are rarely studies about the exact performance of the link layer retransmission scheme in the face of dynamic changes of wireless environment over the UMTS system. The dynamic changes of wireless environment, such as wireless bandwidth, can degrade TCP performance directly. So, in this paper, we simulate and analyze the TCP performance in the UMTS system with dynamic wireless environments. Then, we propose a simple scheme for minimizing TCP performance degradation. As a result of simulation, we can find that when wireless environment is changed dynamically, the probability of TCP timeout is increased, and the TCP performance is degraded very much. In this situation, the proposed simple scheme shows good performance. It saves wireless resources and reduces the degradation of TCP performance without large overhead of the base station.
Keywords
Wireless TCP; UMTS; 3G Mobile Communication;
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