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We design a framework for truthful double multi-channel spectrum auctionswhere each seller (or buyer) can sell (or buy) multiple spectrum channels basedon their individual needs. Open, market-based spectrum trading motivatesexisting spectrum owners (as sellers) to lease their selected idle spectrumchannels to new spectrum users (as buyers) who need the spectrum desperately.The most significant requirement is how to make the auction economic-robust(truthful in particular) while enabling spectrum reuse to improve spectrumutilization. Additionally, in practice, both sellers and buyers would requireto trade multiple channels at one time, while guaranteeing their individualprofitability. Unfortunately, none of the existing designs can meet all theserequirements simultaneously. We address these requirements by proposingTrue-MCSA, a framework for truthful double multi-channel spectrum auctions.True-MCSA takes as input any reusability-driven spectrum allocation algorithm,introduces novel virtual buyer group (VBG) splitting and bidding algorithms,and applies a winner determination and pricing mechanism to achievetruthfulness and other economic properties while improving spectrum utilizationand successfully dealing with multi-channel requests from both buyers andsellers. Our results show that the auction efficiency is impacted by theeconomic factors with efficiency degradations within 30%, under differentexperimental settings. Furthermore, the experimental results indicate that wecan improve the auction efficiency by choosing a proper bidding algorithm andusing a base bid. True-MCSA makes an important contribution on enablingspectrum reuse to improve auction efficiency in multi-channel cases.

True-MCSA: A Framework for Truthful Double Multi-Channel Spectrum Auctions