ER-TCP (Exponential Recovery-TCP): High-Performance TCP for Satellite Networks

Mankyu PARK
Minsu SHIN
Deockgil OH
Doseob AHN
Byungchul KIM
Jaeyong LEE

IEICE TRANSACTIONS on Communications   Vol.E95-B    No.5    pp.1679-1688
Publication Date: 2012/05/01
Online ISSN: 1745-1345
DOI: 10.1587/transcom.E95.B.1679
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Network
TCP variant,  congestion control,  satellite networks,  and performance evaluation,  

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A transmission control protocol (TCP) using an additive increase multiplicative decrease (AIMD) algorithm for congestion control plays a leading role in advanced Internet services. However, the AIMD method shows only low link utilization in lossy networks with long delay such as satellite networks. This is because the cwnd dynamics of TCP are reduced by long propagation delay, and TCP uses an inadequate congestion control algorithm, which does not distinguish packet loss from wireless errors from that due to congestion of the wireless networks. To overcome these problems, we propose an exponential recovery (ER) TCP that uses the exponential recovery function for rapidly occupying available bandwidth during a congestion avoidance period, and an adaptive congestion window decrease scheme using timestamp base available bandwidth estimation (TABE) to cope with wireless channel errors. We simulate the proposed ER-TCP under various test scenarios using the ns-2 network simulator to verify its performance enhancement. Simulation results show that the proposal is a more suitable TCP than the several TCP variants under long delay and heavy loss probability environments of satellite networks.