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M-TCP+: Using Disconnection Feedback to Improve Performance of TCP in Wired/Wireless Networks

Modupe Omueti and Ljiljana Trajkovic

International Symposium on Performance Evaluation of Computer and Telecommunication Systems (SPECTS 2007)
San Diego, California (USA), July 16-18, 2007


In this paper, we propose the M-TCP+ algorithm for heterogeneous wired/wireless networks. The algorithm is a modification of M-TCP, which was proposed for deployment in mobile cellular networks. It is recommended that Internet hosts enable the delayed ACK to maximize network bandwidth by reducing the number of ACKs sent to a TCP sender by a TCP receiver. The M-TCP+ algorithm performs best when the TCP delayed acknowledgement (delayed ACK) option is enabled. The algorithm relies on feedback sent from a wireless host in anticipation of disconnections. We compare the performance of the M-TCP+ algorithm with the performance of M-TCP, TCP NewReno, and TCP SACK in both the presence and the absence of disconnections for a file transfer protocol (download) application. We also simulate network scenarios with traffic congestion. The M-TCP+ algorithm performance is evaluated in terms of file download response time, goodput, and retransmission ratio with and without the delayed ACK option. In scenarios with disconnections, the M-TCP+ algorithm shows 2%-15% performance improvement. Furthermore, in scenarios without disconnections, the M-TCP+ algorithm does not introduce significant processing delay.

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