On Minimum Power Connectivity Problems

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. In particular, 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 a polylogarithmic approximation.

• Type: Conference
• Year: 2007
• Where: ESA
• Authors: Yuval Lando, Zeev Nutov
• Keywords: Approximation Algorithm, ESA 2007, Improved Approximation Algorithms, Logarithmic Approximation Algorithm