Hai Liu , Hong Kong Baptist University, Hong Kong
Xiaowen Chu , Hong Kong Baptist University , Hong Kong
Zhiyong Lin , GuangDong Polytechnic Normal University, China and Hong Kong Baptist University, Hong Kong
Ivan Stojmenovic , University of Ottawa, Ottawa
DOI Bookmark: http://doi.ieeecomputersociety.org/10.1109/TC.2013.77
Connected-dominating-set (CDS) is a representative technique for constructing virtual backbones of wireless networks and thus facilitates implementation of many tasks including broadcasting, routing, etc. Most of existing works on CDS aim at constructing the minimum CDS (MCDS), so as to reduce the communication overhead over the CDS. However, MCDS may not work well in cognitive radio networks (CRNs) where communication links are prone to failure due to stochastic activities of primary users (PUs). A MCDS without consideration of the stochastic activities of PUs easily becomes invalid when the PUs become active. This study addresses a new CDS construction problem by considering the PUs&#x2019; activities. Our problem is to maximize the lifetime of the CDS while minimizing the size of the CDS, where the lifetime of a CDS is defined as the expected duration that the CDS is maintained valid. We show that the problem is NP-hard and propose a three-phase centralized algorithm. Given a CRN, the centralized algorithm can compute a CDS such that the lifetime of the CDS is maximized (optimal), and the size of the CDS is upper-bounded. We further present a two-phase localized algorithm which requires 2-hop information. Extensive simulations are conducted to evaluate the proposed algorithms.
Network topology, Computer Systems Organization, Communication/Networking and Information Technology, Mobile Computing, Algorithm/protocol design and analysis, Architectures, Network Architecture and Design, Distributed networks
Hai Liu, Xiaowen Chu, Zhiyong Lin, Ivan Stojmenovic, "Constructing Connected-Dominating-Set with Maximum Lifetime in Cognitive Radio Networks", IEEE Transactions on Computers, , no. 1, pp. 1, PrePrints PrePrints, doi:10.1109/TC.2013.77