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Approximation algorithms for secondary spectrum auctions

Published: 04 June 2011 Publication History

Abstract

We study combinatorial auctions for the secondary spectrum market. In this market, short-term licenses shall be given to wireless nodes for communication in their local neighborhood. In contrast to the primary market, channels can be assigned to multiple bidders, provided that the corresponding devices are well separated such that the interference is sufficiently low. Interference conflicts are described in terms of a conflict graph in which the nodes represent the bidders and the edges represent conflicts such that the feasible allocations for a channel correspond to the independent sets in the conflict graph.
In this paper, we suggest a novel LP formulation for combinatorial auctions with conflict graph using a non-standard graph parameter, the so-called inductive independence number. Taking into account this parameter enables us to bypass the well-known lower bound of Ω(n1-ε) on the approximability of independent set in general graphs with n nodes (bidders). We achieve significantly better approximation results by showing that interference constraints for wireless networks yield conflict graphs with bounded inductive independence number.
Our framework covers various established models of wireless communication, e.g., the protocol or the physical model. For the protocol model, we achieve an O(√k)-approximation, where k is the number of available channels. For the more realistic physical model, we achieve an O(√k log2 n) approximation based on edge-weighted conflict graphs. Combining our approach with the LP-based framework of Lavi and Swamy, we obtain incentive compatible mechanisms for general bidders with arbitrary valuations on bundles of channels specified in terms of demand oracles.

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    cover image ACM Conferences
    SPAA '11: Proceedings of the twenty-third annual ACM symposium on Parallelism in algorithms and architectures
    June 2011
    404 pages
    ISBN:9781450307437
    DOI:10.1145/1989493
    Permission to make digital or hard copies of all or part of this work for personal or classroom use is granted without fee provided that copies are not made or distributed for profit or commercial advantage and that copies bear this notice and the full citation on the first page. Copyrights for components of this work owned by others than ACM must be honored. Abstracting with credit is permitted. To copy otherwise, or republish, to post on servers or to redistribute to lists, requires prior specific permission and/or a fee. Request permissions from [email protected]

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    Published: 04 June 2011

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    Author Tags

    1. SINR
    2. combinatorial auctions
    3. independent set problem
    4. inductive independence number
    5. physical interference model

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