## Abstract

Protocols that provide reliable communication on top of a network that can lose packets rely on periodically retransmitting packets. The choice of retransmission timeout critically affects system performance. This paper presents a first step toward a theoretical study of the choice of retransmission timeout, based on competitive analysis. In general, competitive analysis compares the performance of an on-line algorithm to the performance of an optimal off-line algorithm, which has access to more information. In this context, the job of an algorithm is to choose the retransmission timeout interval; an off-line algorithm knows the exact message delays, while an on-line algorithm only knows upper and lower bounds on the delays. The performance measure of interest is the expected value of a linear combination of the number of packets used and the amount of time elapsed. An on-line algorithm for choosing the retransmission timeout is presented that is optimal with respect to the difference between its performance and that of an optimal off-line algorithm. The algorithm is also analyzed with respect to the ratio of its performance and that of an optimal off-line algorithm.

Original language | English |
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Pages | 450-455 |

Number of pages | 6 |

State | Published - 1 Jan 1995 |

Externally published | Yes |

Event | Proceedings of the 15th International Conference on Distributed Computing Systems - Vancouver, Can Duration: 30 May 1995 → 2 Jun 1995 |

### Conference

Conference | Proceedings of the 15th International Conference on Distributed Computing Systems |
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City | Vancouver, Can |

Period | 30/05/95 → 2/06/95 |

## ASJC Scopus subject areas

- Software
- Hardware and Architecture
- Computer Networks and Communications