Energy-Efficient network routing with discrete cost functions

Authors:
Lin Wang;Antonio Fernández Anta;Fa Zhang;Chenying Hou;Zhiyong Liu
Affiliations:
Center for Advanced Computing Research and Key Lab of Intelligent Information Processing, Institute of Computing Technology, Chinese Academy of Sciences, China,Graduate University of Chinese Acade ...;Institute IMDEA Networks, Spain;Center for Advanced Computing Research and Key Lab of Intelligent Information Processing, Institute of Computing Technology, Chinese Academy of Sciences, China;Center for Advanced Computing Research and Key Lab of Intelligent Information Processing, Institute of Computing Technology, Chinese Academy of Sciences, China,Graduate University of Chinese Acade ...;China State Key Lab for Computer Architecture, Institute of Computing Technology, Chinese Academy of Sciences, China
Venue:
TAMC'12 Proceedings of the 9th Annual international conference on Theory and Applications of Models of Computation
Year:
2012

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Abstract

Energy consumption is an important issue in the design and use of networks. In this paper, we explore energy savings in networks via a rate adaptation model. This model can be represented by a cost-minimization network routing problem with discrete cost functions. We formulate this problem as an integer program, which is proved to be NP-hard. Then a constant approximation algorithm is developed. In our proposed method, we first transform the program into a continuous-cost network routing problem, and then we approximate the optimal solution by a two-step rounding process. We show by analysis that, for uniform demands, our method provides a constant approximation for the uniform network routing problem with discrete costs. A bicriteria network routing problem is also developed so that a trade-off can be made between energy consumption and network delay. Analytical results for this latter model are also presented.