A record-based retransmission policy on SCTP's Concurrent Multipath Transfer

摘要

Concurrent Multipath Transfer (CMT) uses the SCTP's multi-homing feature to distribute data across multiple end-to-end paths in a multi-homed SCTP association in order to achieving a more benefit cumulative throughput. Using CMT to transfer content-rich streaming media in the Ad hoc network will result in loss rate occurred and changed frequently on paths, and then the loss data need be retransmitted via a certain retransmission strategy. There are five retransmission strategies addressed for destination selecting in CMT. But in the current five retransmission strategies, paths' previous statuses are omitted during selecting destination for retransmission. In fact, paths' historical status can play an import role for paths selecting. In this paper, an improved scheme named RTX_LR is proposed based on paths' historical timeout records. And the average throughput is used as measure metric as well. A demonstrate using simulation is provided showing how receiver buffer (rbuf) blocking is reduced, and average throughput of a rbuf-constrained CMT association could benefit from proposed scheme.