Analysis and improvement of TCP performance in opportunistic networks

Authors:
Yun Li;Xiaohu You;Shiying Lei;Qilie Liu;Kazem Sohraby;Chonggang Wang
Affiliations:
Research Center for Wireless Networks, Chongqing University of Posts and Telecommunications, Chongqing, China 400065 and National Mobile Communications Research Laboratory, Southeast University of ...;National Mobile Communications Research Laboratory, Southeast University of China, Nanjing, China 210096;Research Center for Wireless Networks, Chongqing University of Posts and Telecommunications, Chongqing, China 400065;Research Center for Wireless Networks, Chongqing University of Posts and Telecommunications, Chongqing, China 400065;Department of Electrical and Computer Engineering, South Dakota School of Mines and Technology, Rapid City, USA 57701;InterDigital Communications, King of Prussia, USA 19406
Venue:
Wireless Networks
Year:
2012

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Abstract

Opportunistic networks have attracted attention due to their inherent characteristics, such as long latency, low data rate, and intermittent connectivity. Extensive research has been conducted on opportunistic networks, including the architecture, and routing. However, few in the literature report the performance of TCP in opportunistic networks, especially in the case of Epidemic Routing. In this paper, we first evaluate the performance of TCP in opportunistic networks with Epidemic Routing. Our results show that the Epidemic Routing in opportunistic networks degrades the performance of TCP because multicopy data packets cause duplicate ACKs, and in turn reduce the transmission rate of TCP. Then an enhanced algorithm for TCP, named A-TCP/Reno is proposed to solve the above problem. A-TCP/Reno avoids the duplicate ACK problem caused by Epidemic Routing. The simulation results show that A-TCP/Reno outperforms the TCP/Reno in opportunistic networks with Epidemic Routing protocol.