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MQCC: Maximum Queue Congestion Control for Multipath Networks with Blockage

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Technical Report

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MIT Lincoln Laboratory Lexington United States

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This paper presents a transport layer protocol for multi-path networks with blockage. Using urban SATCOM as an example, we see from data taken from a 2006 measurement campaign that these blockages are generally on the order of 15 seconds in length and the links are blocked approximately 33 of the time. To compensate for this type of impairment, we have developed a multipath IP overlay routing algorithm, a random linear coding reliability scheme, and a maximum-queue-based MQCC congestion control algorithm.MQCC uses average buffer occupancy as a measure of the congestion in a network as opposed to packet loss or round triptime RTT and updates the transmission rate of each source to avoid network congestion. This allows us to design a congestion control algorithm that is independent of the channel conditions and can be made resilient to channel losses. The reliability scheme uses selective negative acknowledgments SNACKs to guarantee packet delivery to the destination. We show through simulation that we can approach the optimal benchmark in realistic lossy blockage channels.

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  • Computer Programming and Software

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