Article ID: | iaor200762 |
Country: | Netherlands |
Volume: | 11 |
Issue: | 2 |
Start Page Number: | 249 |
End Page Number: | 260 |
Publication Date: | Mar 2006 |
Journal: | Journal of Combinatorial Optimization |
Authors: | Liu Hai, Wan Pengjun, Jia Xiaohua |
Keywords: | search, combinatorial optimization |
The paper addresses the relay node placement problem in two-tiered wireless sensor networks. Given a set of sensor nodes in Euclidean plane, our objective is to place minimum number of relay nodes to forward data packets from sensor nodes to the sink, such that: 1) the network is connected, 2) the network is 2-connected. For case one, we propose a (6+e)-approximation algorithm for any e ≥ 0 with polynomial running time when e is fixed. For case two, we propose two approximation algorithms with (24+e) and (6/