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Heterogeneous wireless networks have evolved to reach applicationrequirements for low latency and high throughput on Internet access. Recentstudies have improved network performance employing the Multipath TCP, whichaggregates flows from heterogeneous wireless interfaces in a single connection.Although existing proposals are powerful, coupled congestion control algorithmsare currently limited because of the high variation in path delays, bandwidthand loss rate, typical from heterogeneous wireless networks, even more overconcurrent multipath transmissions. These transmissions experience bufferbloat,i.e., high delays caused by long queues. Hence, to cope with the currentlimitations, this work presents CoDel-LIFO, a new active queue management (AQM)discipline to reduce the dropped packet ratio in the Multipath TCP congestioncontrol mechanism. Differently from other approaches, CoDel-LIFO gives priorityto the most recent packets, being then promising. This paper provides adetailed simulation analysis over congestion control algorithms by comparingCoDel-LIFO to CoDel and DropTail disciplines. Results indicate that CoDel-LIFOreduces queue drops, diminishing the impact on congestion control; improvingsubstantially the goodput; and keeping RTT low.

A New Queue Discipline for Reducing Bufferbloat Effects in HetNet Concurrent Multipath Transfer