New algorithms for online rectangle filling with k‐lookahead

New algorithms for online rectangle filling with k‐lookahead

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Article ID: iaor20111359
Volume: 21
Issue: 1
Start Page Number: 67
End Page Number: 82
Publication Date: Jan 2011
Journal: Journal of Combinatorial Optimization
Authors: , ,
Keywords: communication
Abstract:

We study the online rectangle filling problem which arises in channel aware scheduling of wireless networks, and present deterministic and randomized results for algorithms that are allowed a k‐lookahead for k≥2. Our main result is a deterministic min {1.848,1+2/(k-1)}‐competitive online algorithm. This is the first algorithm for this problem with a competitive ratio approaching 1 as k approaches +∞. The previous best‐known solution for this problem has a competitive ratio of 2 for any k≥2. We also present a randomized online algorithm with a competitive ratio of 1+1/(k+1). Our final result is a closely matching lower bound (also proved in this paper) of 1 + 1 / ( k + 2 + k + 1 ) 2 > 1 + 1 / ( 4 ( k + 2 ) ) equ1 on the competitive ratio of any randomized online algorithm against an oblivious adversary. These are the first known results for randomized algorithms for this problem.

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