Online Bandwidth Allocation
Abstract
The paper investigates a version of the resource allocation problem arising in the wireless networking, namely in the OVSF code reallocation process. In this setting a complete binary tree of a given height is considered, together with a sequence of requests which have to be served in an online manner. The requests are of two types: an insertion request requires to allocate a complete subtree of a given height, and a deletion request frees a given allocated subtree. In order to serve an insertion request it might be necessary to move some already allocated subtrees to other locations in order to free a large enough subtree. We are interested in the worst case average number of such reallocations needed to serve a request. It was proved in previous work that the competitive ratio of the optimal online algorithm solving this problem is between 1.5 and O(n). We partially answer the question about its exact value by giving an O(1)-competitive online algorithm. Same model has been used in the context of memory management systems, and analyzed for the number of reallocations needed to serve a request in the worst case. In this setting, our result is a corresponding amortized analysis.
Cite
@article{arxiv.cs/0701153,
title = {Online Bandwidth Allocation},
author = {Michal Forišek and Branislav Katreniak and Jana Katreniaková and Rastislav Královič and Richard Královič and Vladimír Koutný and Dana Pardubská and Tomáš Plachetka and Branislav Rovan},
journal= {arXiv preprint arXiv:cs/0701153},
year = {2007}
}