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Journal of Information Science and Engineering, Vol. 20 No. 5, pp. 805-820 (September 2004)

Window Adaptive TCP for EGPRS Networks*

Duan-Shin Lee and Chia-Chun Lin+
Department of Computer Science
National Tsing Hua University
Hsinchu, 300 Taiwan
E-mail: lds@cs.nthu.edu.tw
+Institute for Information Industry
Taipei, 106 Taiwan
E-mail: cclin@conpanna.cs.nthu.edu.tw

TCP congestion control for various networks in wireline or wireless environments has been widely discussed. Many research studies have focused on making TCP more sensitive to network congestion by adding explicit notifications to TCP connections or by letting the intermediate nodes in the network join in TCP congestion control. In GPRS/EGPRS systems and other 3G cellular networks, the radio network controller chooses from, among several channel coders, according to the signal to interference ratio. Hence, the channel data rate that an individual user experiences is time-dependent and variable. In this paper, we propose a TCP window control mechanism that adapts to variable channel data rates. Our simulations show that the window adaptive TCP decreases the buffer occupancy and packet transmission delay, and achieves better throughput utilization when compared with the standard TCP Tahoe version and the Reno version.

Keywords: TCP, window control, link adaptation, cellular networks, EGPRS

Full Text () Retrieve PDF document (200409_01.pdf)

Received August 8, 2002; revised March 10, 2003; accepted September 12, 2003.
Communicated by Shiuh-Pyng Shieh.
*This work is supported in part by the National Science Council, Taiwan, R.O.C., (NCS-91-2213-E-007-055) and by the program for promoting academic excellence of universities (89-E-FA04-1-4).