## Abstract

Given a (directed or undirected) graph with edge costs, the power of a node is the maximum cost of an edge leaving it, and the power of the graph is the sum of the powers of its nodes. Motivated by applications for wireless networks, we present polynomial and improved approximation algorithms, as well as inapproximability results, for some classic network design problems under the power minimization criteria. Our main result is for the problem of finding a min-power subgraph that contains k internally-disjoint vs-paths from every node v to a given node s: we give a polynomial algorithm for directed graphs and a logarithmic approximation algorithm for undirected graphs. In contrast, we will show that the corresponding edge-connectivity problems are unlikely to admit even a polylogarithmic approximation.

Original language | English |
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Pages (from-to) | 164-173 |

Number of pages | 10 |

Journal | Journal of Discrete Algorithms |

Volume | 8 |

Issue number | 2 |

DOIs | |

State | Published - Jun 2010 |

### Bibliographical note

Funding Information:This research was supported by The Open University of Israel's Research Fund, grant no. 46102.

Copyright:

Copyright 2010 Elsevier B.V., All rights reserved.

## Keywords

- Approximation algorithms
- Connectivity
- Power assignment
- Wireless networks