SMART Retransmission: Performance with Overload and Random Losses

  • Authors:
  • S. Keshav;S. P. Morgan

  • Affiliations:
  • -;-

  • Venue:
  • INFOCOM '97 Proceedings of the INFOCOM '97. Sixteenth Annual Joint Conference of the IEEE Computer and Communications Societies. Driving the Information Revolution
  • Year:
  • 1997

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Abstract

Feedback flow control, in conjunction with limited buffering in the network, inevitably leads to packet loss. Effective congestion control requires not only effective flow control but also a good retransmission strategy. We present a new retransmission strategy called SMART that combines the best features of the traditional go-back-n and selective-retransmit strategies.We show, first, that go-back-n retransmission with static window flow control leads to congestion collapse when the nominal load exceeds the link capacity. Second, we can avert congestion collapse by replacing go-back-n with SMART retransmission, even with static window flow control. Third, SMART retransmission, when combined with Packet-Pair rate-based flow control, performs extremely well, both when losses are due to buffer overflows and when losses are random.