## Abstract

The QoS Steiner Tree Problem asks for the most cost-efficient way to multicast multimedia to a heterogeneous collection of users with different consumption rates. We assume that the cost of using a link is not constant but rather depends on the maximum bandwidth routed through the link. Formally, given a graph with costs on the edges, a source node and a set of terminal nodes, each one with a bandwidth requirement, the goal is to find a Steiner tree containing the source, and the cheapest assignment of bandwidth to each of its edges so that each source-to-terminal path in the tree has bandwidth at least as large as the bandwidth required by the terminal. Our main contributions are: (1) new covering-type integer linear program formulations for the problem; (2) two new heuristics based on the primal-dual framework; (3) a primaldual constant-factor approximation algorithm; (4) an extensive experimental study of the new heuristics and of several previously proposed algorithms.

Original language | English (US) |
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Pages | 3631-3635 |

Number of pages | 5 |

State | Published - 2003 |

Externally published | Yes |

Event | IEEE Global Telecommunications Conference GLOBECOM'03 - San Francisco, CA, United States Duration: Dec 1 2003 → Dec 5 2003 |

### Other

Other | IEEE Global Telecommunications Conference GLOBECOM'03 |
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Country/Territory | United States |

City | San Francisco, CA |

Period | 12/1/03 → 12/5/03 |

## ASJC Scopus subject areas

- Electrical and Electronic Engineering
- Global and Planetary Change