Maximizing lifetime of connected-dominating-set in cognitive radio networks

Zhiyong Lin*, Hai LIU, Xiaowen CHU, Yiu Wing LEUNG, Ivan Stojmenovic

*Corresponding author for this work

Research output: Chapter in book/report/conference proceedingConference proceedingpeer-review

3 Citations (Scopus)

Abstract

Connected-dominating-set (CDS) is a representative technique for constructing a virtual backbone of wireless networks. Most of existing works on CDS aim at minimizing the size of the CDS, i.e., 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 the unpredictable activities of primary users. A MCDS without consideration of stochastic activities of primary users easily becomes invalid when the primary users reclaim the licensed spectrum. In this work, we assume that the activities of primary users follow the exponential distribution. 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 algorithm. Our basic idea is to apply a pruning-based approach to maximize the lifetime of the CDS. Given a CRN, we prove that our algorithm can compute a CDS such that i) the lifetime of the CDS is maximized (optimal); and ii) the size of the CDS is upper-bounded. To the best of our knowledge, it is the first time in the literature that CDS in CRNs is studied and an effective algorithm is proposed.

Original languageEnglish
Title of host publicationNETWORKING 2012 - 11th International IFIP TC 6 Networking Conference, Proceedings
Pages316-330
Number of pages15
EditionPART 2
DOIs
Publication statusPublished - 2012
Event11th International IFIP TC 6 Networking Conference, NETWORKING 2012 - Prague, Czech Republic
Duration: 21 May 201225 May 2012

Publication series

NameLecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics)
NumberPART 2
Volume7290 LNCS
ISSN (Print)0302-9743
ISSN (Electronic)1611-3349

Conference

Conference11th International IFIP TC 6 Networking Conference, NETWORKING 2012
Country/TerritoryCzech Republic
CityPrague
Period21/05/1225/05/12

Scopus Subject Areas

  • Theoretical Computer Science
  • Computer Science(all)

User-Defined Keywords

  • cognitive radio networks
  • connected-dominating-set
  • lifetime

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